hide processing params for passthrough

* make epub and epub options public

* export only interface

.gitignore

@@ -1 +1,4 @@
 .vscode
+.idea
+.DS_Store
+/tmp/

README.md

@@ -2,7 +2,7 @@
 
 Convert CBZ/CBR/Dir into EPUB for e-reader devices (Kindle Devices, ...)
 
-My goal is to make a simple, crossplatform, and fast tool to convert comics into EPUB.
+My goal is to make a simple, cross-platform, and fast tool to convert comics into EPUB.
 
 EPUB is now support by Amazon through [SendToKindle](https://www.amazon.com/gp/sendtokindle/), by Email or by using the App. So I've made it simple to support the size limit constraint of those services.
 
@@ -13,15 +13,20 @@ EPUB is now support by Amazon through [SendToKindle](https://www.amazon.com/gp/s
 - Customize output image quality
 - Intelligent cropping (support removing even page numbers)
 - Customize brightness and contrast
+- Auto contrast
 - Auto rotate (if reader mainly read on portrait)
 - Auto split double page (for easy read on portrait)
+- Keep double page if split
 - Remove blank image (empty image is removed)
 - Manga or Normal mode
 - Support cover page or not (first page will be taken in that case)
+- Support title page (cover with embedded title and part)
 - Split EPUB size for easy upload
 - 3 sorting methods (depending on your source, you can ensure the page go in the right order)
 - Save and reuse your own perfect settings
 - Multi tasks for fast conversion
+- Apple Book Compatibility Mode
+- JSON output for programmatic usage
 
 When you read the comic on a Kindle, you can customize how you read it with the `Aa` button:
 - Landscape / Portrait
@@ -33,19 +38,19 @@ First ensure to have a working version of GO: [Installation](https://go.dev/doc/
 
 Then install the last version of the tool:
 ```
-$ go install github.com/celogeek/go-comic-converter/v2
+$ go install github.com/celogeek/go-comic-converter/v3
 ```
 
 To force install a specific version:
 ```
 # specific version
-$ go install github.com/celogeek/go-comic-converter/v2@v2.4.0
+$ go install github.com/celogeek/go-comic-converter/v3@v3.0.0
 
 # main branch
-$ go install github.com/celogeek/go-comic-converter/v2@main
+$ go install github.com/celogeek/go-comic-converter/v3@main
 
 # specific commit
-$ go install github.com/celogeek/go-comic-converter/v2@141aeae
+$ go install github.com/celogeek/go-comic-converter/v3@COMMIT_HASH
 ```
 
 Add GOPATH to your PATH
@@ -53,29 +58,39 @@ Add GOPATH to your PATH
 $ export PATH=$(go env GOPATH)/bin:$PATH
 ```
 
+# Upgrade from V2
+
+The configuration file structure changes in the v3 compare to v2.
+
+You need to recreate your config and save it again.
+
+Use the `show`, `reset` and `save` option.
+
 # Check last version
 
 You can check if a new version is available with:
 ```
 $ go-comic-converter -version
 go-comic-converter
-  Path             : github.com/celogeek/go-comic-converter/v2
+  Path             : github.com/celogeek/go-comic-converter/v3
-  Sum              : h1:qOYGRpdT4t6fPksFHHrMmg+AvKSliNL6JfNWcvLGesU=
+  Sum              : h1:tUFF2m/fGlOJOwC0/PlTopMfcBMprKvgr6TiQHQxEeo=
-  Version          : v2.4.0
+  Version          : v3.0.0
-  Available Version: v2.4.0
+  Available Version: v3.0.0
 
 To install the latest version:
-$ go install github.com/celogeek/go-comic-converter/v2@v2.4.0
+$ go install github.com/celogeek/go-comic-converter/v3@v3.0.0
 ```
 
 # Supported image files
 
 The supported image files are jpeg and png from the sources.
 
-The extensions can be: `jpg`, `jpeg`, `png`, `webp`.
+The extensions can be: `jpg`, `jpeg`, `png`, `webp`, `tiff`.
 
 The case for extensions doesn't matter.
 
+For the passthrough mode (format=copy), the supported extensions are: `jpg`, `jpeg`, `png`
+
 # Usage
 
 ## Convert directory
@@ -83,20 +98,20 @@ The case for extensions doesn't matter.
 Convert every supported image files found in the input directory:
 
 ```
-$ go-comic-converter -profile KS -input ~/Download/MyComic
+$ go-comic-converter -profile SR -input ~/Download/MyComic
 ```
 
-By default it will output: ~/Download/MyComic.epub
+By default, it will output: ~/Download/MyComic.epub
 
 ## Convert CBZ, ZIP, CBR, RAR, PDF
 
 Convert every supported image files found in the input directory:
 
 ```
-$ go-comic-converter -profile KS -input ~/Download/MyComic.[CBZ,ZIP,CBR,RAR,PDF]
+$ go-comic-converter -profile SR -input ~/Download/MyComic.[CBZ,ZIP,CBR,RAR,PDF]
 ```
 
-By default it will output: ~/Download/MyComic.epub
+By default, it will output: ~/Download/MyComic.epub
 
 ## Convert with size limit
 
@@ -108,7 +123,7 @@ If you send your ePub through Amazon service, you have some size limitation:
 You can split your file using the "-limitmb MB" option:
 
 ```
-go-comic-converter -profile KS -input ~/Download/MyComic.[CBZ,ZIP,CBR,RAR,PDF] -limitmb 200
+go-comic-converter -profile SR -input ~/Download/MyComic.[CBZ,ZIP,CBR,RAR,PDF] -limitmb 200
 ```
 
 If you have more than 1 file the output will be:
@@ -125,10 +140,10 @@ If the total is above 1, then the title of the EPUB include:
 
 ## Dry run
 
-If you want to preview what will be set during the convertion without running the conversion, then you can use the `-dry` option.
+If you want to preview what will be set during the conversion without running the conversion, then you can use the `-dry` option.
 
 ```
-$ go-comic-converter -input ~/Downloads/mymanga.cbr -profile KS -auto -manga -limitmb 200 -dry
+$ go-comic-converter -input ~/Downloads/mymanga.cbr -profile SR -auto -manga -limitmb 200 -dry
 Go Comic Converter
 
 Options:
@@ -136,23 +151,31 @@ Options:
     Output                          : ~/Downloads/mymanga.epub
     Author                          : GO Comic Converter
     Title                           : mymanga
-    Workers                   : 8
+    Workers                         : 20
-    Profile                   : KS - Kindle Scribe - 1860x2480
+    Profile                         : SR - Standard Resolution - 1200x1920
-    ViewRatio                 : 1:1.5
+    Format                          : jpeg
-    View                      : 1653x2480
     Quality                         : 85
+    Grayscale                       : true
+    Grayscale mode                  : normal
     Crop                            : true
-    CropRatio                 : 1 Left - 1 Up - 1 Right - 3 Bottom
+    Crop ratio                      : 1 Left - 1 Up - 1 Right - 3 Bottom - Limit 0% - Skip false
-    Brightness                : 0
+    Auto contrast                   : true
-    Contrast                  : 0
+    Auto rotate                     : true
-    AutoRotate                : true
+    Auto split double page          : true
-    AutoSplitDoublePage       : true
+    Keep double page if split       : true
-    NoBlankImage              : true
+    No blank image                  : true
     Manga                           : true
-    HasCover                  : true
+    Has cover                       : true
-    LimitMb                   : 200 Mb
+    Limit                           : 200 Mb
-    StripFirstDirectoryFromToc: true
+    Strip first directory from toc  : false
-    SortPathMode              : path=alphanum, file=alpha
+    Sort path mode                  : path=alphanumeric, file=alpha
+    Foreground color                : #000
+    Background color                : #FFF
+    Resize                          : true
+    Aspect ratio                    : auto
+    Portrait only                   : false
+    Title page                      : always
+    Apple book compatibility        : false
 
 TOC:
   - mymanga
@@ -163,12 +186,12 @@ TOC:
 
 ## Dry verbose
 
-You can choose different way to sort path and files, depending of your source. You can preview the sorted result with the option `dry-verbose` associated with `dry`.
+You can choose different way to sort path and files, depending on your source. You can preview the sorted result with the option `dry-verbose` associated with `dry`.
 
 The option `sort` allow you to change the sorting order.
 
 ```
-$ go-comic-converter -input ~/Downloads/mymanga.cbr -profile KS -auto -manga -limitmb 200 -dry -dry-verbose -sort 2
+$ go-comic-converter -input ~/Downloads/mymanga.cbr -profile SR -auto -manga -limitmb 200 -dry -dry-verbose -sort 2
 Go Comic Converter
 
 Options:
@@ -176,23 +199,31 @@ Options:
     Output                          : ~/Downloads/mymanga.epub
     Author                          : GO Comic Converter
     Title                           : mymanga
-    Workers                   : 8
+    Workers                         : 20
-    Profile                   : KS - Kindle Scribe - 1860x2480
+    Profile                         : SR - Standard Resolution - 1200x1920
-    ViewRatio                 : 1:1.5
+    Format                          : jpeg
-    View                      : 1653x2480
     Quality                         : 85
+    Grayscale                       : true
+    Grayscale mode                  : normal
     Crop                            : true
-    CropRatio                 : 1 Left - 1 Up - 1 Right - 3 Bottom
+    Crop ratio                      : 1 Left - 1 Up - 1 Right - 3 Bottom - Limit 0% - Skip false
-    Brightness                : 0
+    Auto contrast                   : true
-    Contrast                  : 0
+    Auto rotate                     : true
-    AutoRotate                : true
+    Auto split double page          : true
-    AutoSplitDoublePage       : true
+    Keep double page if split       : true
-    NoBlankImage              : true
+    No blank image                  : true
     Manga                           : true
-    HasCover                  : true
+    Has cover                       : true
-    LimitMb                   : 200 Mb
+    Limit                           : 200 Mb
-    StripFirstDirectoryFromToc: true
+    Strip first directory from toc  : false
-    SortPathMode              : path=alphanum, file=alphanum
+    Sort path mode                  : path=alphanumeric, file=alpha
+    Foreground color                : #000
+    Background color                : #FFF
+    Resize                          : true
+    Aspect ratio                    : auto
+    Portrait only                   : false
+    Title page                      : always
+    Apple book compatibility        : false
 
 TOC:
   - mymanga
@@ -227,47 +258,62 @@ $ go-comic-converter -show
 Go Comic Converter
 
 Options:
-    Profile                   :
+    Profile                         : SR - Standard Resolution - 1200x1920
-    ViewRatio                 : 1:1.5
+    Format                          : jpeg
-    View                      :
     Quality                         : 85
+    Grayscale                       : true
+    Grayscale mode                  : normal
     Crop                            : true
-    CropRatio                 : 1 Left - 1 Up - 1 Right - 3 Bottom
+    Crop ratio                      : 1 Left - 1 Up - 1 Right - 3 Bottom - Limit 0% - Skip false
-    Brightness                : 0
+    Auto contrast                   : false
-    Contrast                  : 0
+    Auto rotate                     : false
-    AutoRotate                : false
+    Auto split double page          : false
-    AutoSplitDoublePage       : false
+    No blank image                  : true
-    NoBlankImage              : true
     Manga                           : false
-    HasCover                  : true
+    Has cover                       : true
-    LimitMb                   : nolimit
+    Strip first directory from toc  : false
-    StripFirstDirectoryFromToc: false
+    Sort path mode                  : path=alphanumeric, file=alpha
-    SortPathMode              : path=alphanum, file=alpha
+    Foreground color                : #000
+    Background color                : #FFF
+    Resize                          : true
+    Aspect ratio                    : auto
+    Portrait only                   : false
+    Title page                      : always
+    Apple book compatibility        : false
 ```
 
 ### Change default settings
 ```
-$ go-comic-converter -manga -auto -profile KS -limitmb 200 -save
+$ go-comic-converter -manga -auto -profile SR -limitmb 200 -save
 
 Go Comic Converter
 
 Options:
-    Profile                   : KS - Kindle Scribe - 1860x2480
+    Profile                         : SR - Standard Resolution - 1200x1920
-    ViewRatio                 : 1:1.5
+    Format                          : jpeg
-    View                      : 1653x2480
     Quality                         : 85
+    Grayscale                       : true
+    Grayscale mode                  : normal
     Crop                            : true
-    CropRatio                 : 1 Left - 1 Up - 1 Right - 3 Bottom
+    Crop ratio                      : 1 Left - 1 Up - 1 Right - 3 Bottom - Limit 0% - Skip false
-    Brightness                : 0
+    Auto contrast                   : true
-    Contrast                  : 0
+    Auto rotate                     : true
-    AutoRotate                : true
+    Auto split double page          : true
-    AutoSplitDoublePage       : true
+    Keep double page if split       : true
-    NoBlankImage              : true
+    Keep split double page aspect   : true
+    No blank image                  : true
     Manga                           : true
-    HasCover                  : true
+    Has cover                       : true
-    LimitMb                   : 200 Mb
+    Limit                           : 200 Mb
-    StripFirstDirectoryFromToc: false
+    Strip first directory from toc  : false
-    SortPathMode              : path=alphanum, file=alpha
+    Sort path mode                  : path=alphanumeric, file=alpha
+    Foreground color                : #000
+    Background color                : #FFF
+    Resize                          : true
+    Aspect ratio                    : auto
+    Portrait only                   : false
+    Title page                      : always
+    Apple book compatibility        : false
 
 Saving to ~/.go-comic-converter.yaml
 ```
@@ -276,30 +322,34 @@ If you want to change a setting, you can change only one of them
 ```
 $ go-comic-converter -manga=0 -save
 
-Go Comic Converter
-
 Options:
-    Profile                   : KS - Kindle Scribe - 1860x2480
+    Profile                         : SR - Standard Resolution - 1200x1920
-    ViewRatio                 : 1:1.5
+    Format                          : jpeg
-    View                      : 1653x2480
     Quality                         : 85
+    Grayscale                       : true
+    Grayscale mode                  : normal
     Crop                            : true
-    CropRatio                 : 1 Left - 1 Up - 1 Right - 3 Bottom
+    Crop ratio                      : 1 Left - 1 Up - 1 Right - 3 Bottom - Limit 0% - Skip false
-    Brightness                : 0
+    Auto contrast                   : false
-    Contrast                  : 0
+    Auto rotate                     : false
-    AutoRotate                : true
+    Auto split double page          : false
-    AutoSplitDoublePage       : true
+    No blank image                  : true
-    NoBlankImage              : true
     Manga                           : false
-    HasCover                  : true
+    Has cover                       : true
-    LimitMb                   : 200 Mb
+    Strip first directory from toc  : false
-    StripFirstDirectoryFromToc: false
+    Sort path mode                  : path=alphanumeric, file=alpha
-    SortPathMode              : path=alphanum, file=alpha
+    Foreground color                : #000
+    Background color                : #FFF
+    Resize                          : true
+    Aspect ratio                    : auto
+    Portrait only                   : false
+    Title page                      : always
+    Apple book compatibility        : false
 
 Saving to ~/.go-comic-converter.yaml
 ```
 
-### Reset default
+### Reset default
 To reset all value to default:
 
 ```
@@ -307,64 +357,74 @@ $ go-comic-converter -reset
 Go Comic Converter
 
 Options:
-    Profile                   :
+    Profile                         : SR - Standard Resolution - 1200x1920
-    ViewRatio                 : 1:1.5
+    Format                          : jpeg
-    View                      :
     Quality                         : 85
+    Grayscale                       : true
+    Grayscale mode                  : normal
     Crop                            : true
-    CropRatio                 : 1 Left - 1 Up - 1 Right - 3 Bottom
+    Crop ratio                      : 1 Left - 1 Up - 1 Right - 3 Bottom - Limit 0% - Skip false
-    Brightness                : 0
+    Auto contrast                   : false
-    Contrast                  : 0
+    Auto rotate                     : false
-    AutoRotate                : false
+    Auto split double page          : false
-    AutoSplitDoublePage       : false
+    No blank image                  : true
-    NoBlankImage              : true
     Manga                           : false
-    HasCover                  : true
+    Has cover                       : true
-    LimitMb                   : nolimit
+    Strip first directory from toc  : false
-    StripFirstDirectoryFromToc: false
+    Sort path mode                  : path=alphanumeric, file=alpha
-    SortPathMode              : path=alphanum, file=alpha
+    Foreground color                : #000
+    Background color                : #FFF
+    Resize                          : true
+    Aspect ratio                    : auto
+    Portrait only                   : false
+    Title page                      : always
+    Apple book compatibility        : false
 
 Reset default to ~/.go-comic-converter.yaml
 ```
 
 # My own settings
 
-After playing around with the options, I have my perfect settings for a Kindle Scribe.
+After playing around with the options, I have my perfect settings for all my devices.
 
 ```
 $ go-comic-converter -reset
-$ go-comic-converter -profile KS -quality 90 -autosplitdoublepage -manga -limitmb 200 -strip -save
+$ go-comic-converter -profile SR -quality 90 -manga -aspect-ratio 1.6 -limitmb 200 -save
-
-Go Comic Converter
 
 Options:
-    Profile                   : KS - Kindle Scribe - 1860x2480
+    Profile                         : SR - Standard Resolution - 1200x1920
-    ViewRatio                 : 1:1.5
+    Format                          : jpeg
-    View                      : 1653x2480
     Quality                         : 90
+    Grayscale                       : true
+    Grayscale mode                  : normal
     Crop                            : true
-    CropRatio                 : 1 Left - 1 Up - 1 Right - 3 Bottom
+    Crop ratio                      : 1 Left - 1 Up - 1 Right - 3 Bottom - Limit 0% - Skip false
-    Brightness                : 0
+    Auto contrast                   : false
-    Contrast                  : 0
+    Auto rotate                     : false
-    AutoRotate                : false
+    Auto split double page          : false
-    AutoSplitDoublePage       : true
+    No blank image                  : true
-    NoBlankImage              : true
     Manga                           : true
-    HasCover                  : true
+    Has cover                       : true
-    LimitMb                   : 200 Mb
+    Limit                           : 200 Mb
-    StripFirstDirectoryFromToc: true
+    Strip first directory from toc  : false
-    SortPathMode              : path=alphanum, file=alpha
+    Sort path mode                  : path=alphanumeric, file=alpha
+    Foreground color                : #000
+    Background color                : #FFF
+    Resize                          : true
+    Aspect ratio                    : 1:1.60
+    Portrait only                   : false
+    Title page                      : always
+    Apple book compatibility        : false
 
 Saving to ~/.go-comic-converter.yaml
 ```
 
 Explanation:
-- `-profile KS`: Kindle Scribe
+- `-profile SR`: standard resolution (fast conversion from Amazon as images do not need to be resized)
 - `-quality 90`: JPEG output quality of images
-- `-autosplitdoublepage`: split double page into 2 images after displaying in full quality. Perfect render in landscape, great in portrait
 - `-manga`: manga mode, read right to left
 - `-limitmb 200`: size limit to 200MB allowing upload from SendToKindle website
-- `-strip`: remove first level if alone on TOC, as offen comics include a main directory with the title
+- `-aspect-ratio`: ensure aspect ratio is 1:1.6, best for kindle devices.
 # Help
 
 ```
@@ -383,34 +443,45 @@ Output:
     	Title of the EPUB
 
 Config:
-  -profile string
+  -profile string (default "SR")
     	Profile to use: 
-    	    - K1      (   600x670 ) - Kindle 1
+    	    - KoAO    - 1404 x 1872 - Kobo Aura ONE
-    	    - K11     ( 1072x1448 ) - Kindle 11
+    	    - KoF     - 1440 x 1920 - Kobo Forma
-    	    - K2      (   600x670 ) - Kindle 2
+    	    - KoE     - 1404 x 1872 - Kobo Elipsa
-    	    - K34     (   600x800 ) - Kindle Keyboard/Touch
+    	    - KV      - 1072 x 1448 - Kindle Paperwhite 3/4/Voyage/Oasis
-    	    - K578    (   600x800 ) - Kindle
+    	    - KoG     -  768 x 1024 - Kobo Glo
-    	    - KDX     (  824x1000 ) - Kindle DX/DXG
+    	    - KoA     -  758 x 1024 - Kobo Aura
-    	    - KPW     (  758x1024 ) - Kindle Paperwhite 1/2
+    	    - RM1     - 1404 x 1872 - reMarkable 1
-    	    - KV      ( 1072x1448 ) - Kindle Paperwhite 3/4/Voyage/Oasis
+    	    - RM2     - 1404 x 1872 - reMarkable 2
-    	    - KPW5    ( 1236x1648 ) - Kindle Paperwhite 5/Signature Edition
+    	    - K1      -  600 x 670  - Kindle 1
-    	    - KO      ( 1264x1680 ) - Kindle Oasis 2/3
+    	    - K11     - 1072 x 1448 - Kindle 11
-    	    - KS      ( 1860x2480 ) - Kindle Scribe
+    	    - K2      -  600 x 670  - Kindle 2
-    	    - KoMT    (   600x800 ) - Kobo Mini/Touch
+    	    - K34     -  600 x 800  - Kindle Keyboard/Touch
-    	    - KoG     (  768x1024 ) - Kobo Glo
+    	    - KPW5    - 1236 x 1648 - Kindle Paperwhite 5/Signature Edition
-    	    - KoGHD   ( 1072x1448 ) - Kobo Glo HD
+    	    - KoAH2O  - 1080 x 1430 - Kobo Aura H2O
-    	    - KoA     (  758x1024 ) - Kobo Aura
+    	    - KoN     -  758 x 1024 - Kobo Nia
-    	    - KoAHD   ( 1080x1440 ) - Kobo Aura HD
+    	    - KoL     - 1264 x 1680 - Kobo Libra H2O/Kobo Libra 2
-    	    - KoAH2O  ( 1080x1430 ) - Kobo Aura H2O
+    	    - HR      - 2400 x 3840 - High Resolution
-    	    - KoAO    ( 1404x1872 ) - Kobo Aura ONE
+    	    - KO      - 1264 x 1680 - Kindle Oasis 2/3
-    	    - KoN     (  758x1024 ) - Kobo Nia
+    	    - KS      - 1860 x 2480 - Kindle Scribe
-    	    - KoC     ( 1072x1448 ) - Kobo Clara HD/Kobo Clara 2E
+    	    - KoMT    -  600 x 800  - Kobo Mini/Touch
-    	    - KoL     ( 1264x1680 ) - Kobo Libra H2O/Kobo Libra 2
+    	    - KoAHD   - 1080 x 1440 - Kobo Aura HD
-    	    - KoF     ( 1440x1920 ) - Kobo Forma
+    	    - KoC     - 1072 x 1448 - Kobo Clara HD/Kobo Clara 2E
-    	    - KoS     ( 1440x1920 ) - Kobo Sage
+    	    - KoS     - 1440 x 1920 - Kobo Sage
-    	    - KoE     ( 1404x1872 ) - Kobo Elipsa
+    	    - SR      - 1200 x 1920 - Standard Resolution
+    	    - K578    -  600 x 800  - Kindle
+    	    - KDX     -  824 x 1000 - Kindle DX/DXG
+    	    - KPW     -  758 x 1024 - Kindle Paperwhite 1/2
+    	    - KoGHD   - 1072 x 1448 - Kobo Glo HD
   -quality int (default 85)
     	Quality of the image
+  -grayscale (default true)
+    	Grayscale image. Ideal for eInk devices.
+  -grayscale-mode int
+    	Grayscale Mode
+    	0 = normal
+    	1 = average
+    	2 = luminance
   -crop (default true)
     	Crop images
   -crop-ratio-left int (default 1)
@@ -421,16 +492,24 @@ Config:
     	Crop ratio right: ratio of pixels allow to be non blank while cutting on the right.
   -crop-ratio-bottom int (default 3)
     	Crop ratio bottom: ratio of pixels allow to be non blank while cutting on the bottom.
+  -crop-limit int
+    	Crop limit: maximum number of cropping in percentage allowed. 0 mean unlimited.
+  -crop-skip-if-limit-reached
+    	Crop skip if limit reached.
   -brightness int
-    	Brightness readjustement: between -100 and 100, > 0 lighter, < 0 darker
+    	Brightness readjustment: between -100 and 100, > 0 lighter, < 0 darker
   -contrast int
-    	Contrast readjustement: between -100 and 100, > 0 more contrast, < 0 less contrast
+    	Contrast readjustment: between -100 and 100, > 0 more contrast, < 0 less contrast
+  -autocontrast
+    	Improve contrast automatically
   -autorotate
     	Auto Rotate page when width > height
-  -auto
-    	Activate all automatic options
   -autosplitdoublepage
     	Auto Split double page when width > height
+  -keepdoublepageifsplit (default true)
+    	Keep the double page if split
+  -keepsplitdoublepageaspect (default true)
+    	Keep aspect of split part of a double page (best for landscape rendering)
   -noblankimage (default true)
     	Remove blank image
   -manga
@@ -438,14 +517,34 @@ Config:
   -hascover (default true)
     	Has cover. Indicate if your comic have a cover. The first page will be used as a cover and include after the title.
   -limitmb int
-    	Limit size of the ePub: Default nolimit (0), Minimum 20
+    	Limit size of the EPUB: Default nolimit (0), Minimum 20
   -strip
     	Strip first directory from the TOC if only 1
   -sort int (default 1)
     	Sort path mode
     	0 = alpha for path and file
-    	1 = alphanum for path and alpha for file
+    	1 = alphanumeric for path and alpha for file
-    	2 = alphanum for path and file
+    	2 = alphanumeric for path and file
+  -foreground-color string (default "000")
+    	Foreground color in hexadecimal format RGB. Black=000, White=FFF
+  -background-color string (default "FFF")
+    	Background color in hexadecimal format RGB. Black=000, White=FFF, Light Gray=DDD, Dark Gray=777
+  -resize (default true)
+    	Reduce image size if exceed device size
+  -format string (default "jpeg")
+    	Format of output images: jpeg (lossy), png (lossless), copy (no processing)
+  -aspect-ratio float
+    	Aspect ratio (height/width) of the output
+    	 -1 = same as device
+    	  0 = same as source
+    	1.6 = amazon advice for kindle
+  -portrait-only
+    	Portrait only: force orientation to portrait only.
+  -titlepage int (default 1)
+    	Title page
+    	0 = never
+    	1 = always
+    	2 = only if epub is split
 
 Default config:
   -show
@@ -455,8 +554,26 @@ Default config:
   -reset
     	Reset your parameters to default
 
+Shortcut:
+  -auto
+    	Activate all automatic options
+  -nofilter
+    	Deactivate all filters
+  -maxquality
+    	Max quality: color png + noresize
+  -bestquality
+    	Max quality: color jpg q100 + noresize
+  -greatquality
+    	Max quality: grayscale jpg q90 + noresize
+  -goodquality
+    	Max quality: grayscale jpg q90
+
+Compatibility:
+  -applebookcompatibility
+    	Apple book compatibility
+
 Other:
-  -workers int (default CPU)
+  -workers int (default number of CPUs)
     	Number of workers
   -dry
     	Dry run to show all options
@@ -464,6 +581,8 @@ Other:
     	Display also sorted files after the TOC
   -quiet
     	Disable progress bar
+  -json
+    	Output progression and information in Json format
   -version
     	Show current and available version
   -help
@@ -476,3 +595,7 @@ This project is largely inspired from KCC (Kindle Comic Converter). Thanks:
  - [ciromattia](https://github.com/ciromattia/kcc)
  - [darodi fork](https://github.com/darodi/kcc)
 
+# UI
+
+Thanks for UI contribution:
+ - [manueldidonna / Comic2Books](https://github.com/manueldidonna/comic2books)

go.mod

@@ -1,29 +1,28 @@
-module github.com/celogeek/go-comic-converter/v2
+module github.com/celogeek/go-comic-converter/v3
 
-go 1.19
+go 1.23
 
 require (
-	github.com/beevik/etree v1.1.0
+	github.com/beevik/etree v1.5.0
 	github.com/disintegration/gift v1.2.1
+	github.com/fogleman/gg v1.3.0
 	github.com/gofrs/uuid v4.4.0+incompatible
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
-	github.com/nwaples/rardecode/v2 v2.0.0-beta.2
+	github.com/nwaples/rardecode/v2 v2.1.0
 	github.com/raff/pdfreader v0.0.0-20220308062436-033e8ac577f0
-	github.com/schollz/progressbar/v3 v3.13.1
+	github.com/schollz/progressbar/v3 v3.18.0
 	github.com/tcnksm/go-latest v0.0.0-20170313132115-e3007ae9052e
-	golang.org/x/image v0.7.0
+	golang.org/x/image v0.24.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
 	github.com/google/go-github v17.0.0+incompatible // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
-	github.com/hashicorp/go-version v1.6.0 // indirect
+	github.com/hashicorp/go-version v1.7.0 // indirect
-	github.com/mattn/go-runewidth v0.0.14 // indirect
 	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db // indirect
-	github.com/rivo/uniseg v0.4.4 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/stretchr/testify v1.8.2 // indirect
+	golang.org/x/net v0.35.0 // indirect
-	golang.org/x/net v0.9.0 // indirect
+	golang.org/x/sys v0.30.0 // indirect
-	golang.org/x/sys v0.7.0 // indirect
+	golang.org/x/term v0.29.0 // indirect
-	golang.org/x/term v0.7.0 // indirect
 )

go.sum

@@ -1,10 +1,13 @@
-github.com/beevik/etree v1.1.0 h1:T0xke/WvNtMoCqgzPhkX2r4rjY3GDZFi+FjpRZY2Jbs=
+github.com/beevik/etree v1.5.0 h1:iaQZFSDS+3kYZiGoc9uKeOkUY3nYMXOKLl6KIJxiJWs=
-github.com/beevik/etree v1.1.0/go.mod h1:r8Aw8JqVegEf0w2fDnATrX9VpkMcyFeM0FhwO62wh+A=
+github.com/beevik/etree v1.5.0/go.mod h1:gPNJNaBGVZ9AwsidazFZyygnd+0pAU38N4D+WemwKNs=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/chengxilo/virtualterm v1.0.4 h1:Z6IpERbRVlfB8WkOmtbHiDbBANU7cimRIof7mk9/PwM=
+github.com/chengxilo/virtualterm v1.0.4/go.mod h1:DyxxBZz/x1iqJjFxTFcr6/x+jSpqN0iwWCOK1q10rlY=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/disintegration/gift v1.2.1 h1:Y005a1X4Z7Uc+0gLpSAsKhWi4qLtsdEcMIbbdvdZ6pc=
 github.com/disintegration/gift v1.2.1/go.mod h1:Jh2i7f7Q2BM7Ezno3PhfezbR1xpUg9dUg3/RlKGr4HI=
+github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8=
+github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/gofrs/uuid v4.4.0+incompatible h1:3qXRTX8/NbyulANqlc0lchS1gqAVxRgsuW1YrTJupqA=
 github.com/gofrs/uuid v4.4.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
@@ -15,80 +18,36 @@ github.com/google/go-github v17.0.0+incompatible h1:N0LgJ1j65A7kfXrZnUDaYCs/Sf4r
 github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
 github.com/google/go-querystring v1.1.0 h1:AnCroh3fv4ZBgVIf1Iwtovgjaw/GiKJo8M8yD/fhyJ8=
 github.com/google/go-querystring v1.1.0/go.mod h1:Kcdr2DB4koayq7X8pmAG4sNG59So17icRSOU623lUBU=
-github.com/hashicorp/go-version v1.6.0 h1:feTTfFNnjP967rlCxM/I9g701jU+RN74YKx2mOkIeek=
+github.com/hashicorp/go-version v1.7.0 h1:5tqGy27NaOTB8yJKUZELlFAS/LTKJkrmONwQKeRZfjY=
-github.com/hashicorp/go-version v1.6.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
+github.com/hashicorp/go-version v1.7.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
-github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213/go.mod h1:vNUNkEQ1e29fT/6vq2aBdFsgNPmy8qMdSay1npru+Sw=
+github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
-github.com/mattn/go-isatty v0.0.17/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
-github.com/mattn/go-runewidth v0.0.14 h1:+xnbZSEeDbOIg5/mE6JF0w6n9duR1l3/WmbinWVwUuU=
-github.com/mattn/go-runewidth v0.0.14/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
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 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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 github.com/raff/pdfreader v0.0.0-20220308062436-033e8ac577f0/go.mod h1:Ql3QqeGiYGlPOtYz+F/L7J27spqDcdH9LhDHOrrdsD4=
-github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/converter/converter.go

@@ -1,402 +0,0 @@
-/*
-Converter Helper to parse and prepare options for go-comic-converter.
-
-It use goflag with additional feature:
-  - Keep original order
-  - Support section
-*/
-package converter
-
-import (
-	"errors"
-	"flag"
-	"fmt"
-	"os"
-	"path/filepath"
-	"reflect"
-	"regexp"
-	"runtime"
-	"strings"
-	"time"
-
-	"github.com/celogeek/go-comic-converter/v2/internal/converter/options"
-)
-
-type Converter struct {
-	Options *options.Options
-	Cmd     *flag.FlagSet
-
-	order           []converterOrder
-	isZeroValueErrs []error
-	startAt         time.Time
-}
-
-// Create a new parser
-func New() *Converter {
-	options := options.New()
-	cmd := flag.NewFlagSet("go-comic-converter", flag.ExitOnError)
-	conv := &Converter{
-		Options: options,
-		Cmd:     cmd,
-		order:   make([]converterOrder, 0),
-		startAt: time.Now(),
-	}
-
-	var cmdOutput strings.Builder
-	cmd.SetOutput(&cmdOutput)
-	cmd.Usage = func() {
-		fmt.Fprintf(os.Stderr, "Usage of %s:\n", filepath.Base(os.Args[0]))
-		for _, o := range conv.order {
-			switch v := o.(type) {
-			case converterOrderSection:
-				fmt.Fprintf(os.Stderr, "\n%s:\n", o.Value())
-			case converterOrderName:
-				fmt.Fprintln(os.Stderr, conv.Usage(v.isString, cmd.Lookup(v.Value())))
-			}
-		}
-		if cmdOutput.Len() > 0 {
-			fmt.Fprintf(os.Stderr, "\nError: %s", cmdOutput.String())
-		}
-	}
-
-	return conv
-}
-
-// Load default options (config + default)
-func (c *Converter) LoadConfig() error {
-	return c.Options.LoadConfig()
-}
-
-// Create a new section of config
-func (c *Converter) AddSection(section string) {
-	c.order = append(c.order, converterOrderSection{value: section})
-}
-
-// Add a string parameter
-func (c *Converter) AddStringParam(p *string, name string, value string, usage string) {
-	c.Cmd.StringVar(p, name, value, usage)
-	c.order = append(c.order, converterOrderName{value: name, isString: true})
-}
-
-// Add an integer parameter
-func (c *Converter) AddIntParam(p *int, name string, value int, usage string) {
-	c.Cmd.IntVar(p, name, value, usage)
-	c.order = append(c.order, converterOrderName{value: name})
-}
-
-// Add an float parameter
-func (c *Converter) AddFloatParam(p *float64, name string, value float64, usage string) {
-	c.Cmd.Float64Var(p, name, value, usage)
-	c.order = append(c.order, converterOrderName{value: name})
-}
-
-// Add a boolean parameter
-func (c *Converter) AddBoolParam(p *bool, name string, value bool, usage string) {
-	c.Cmd.BoolVar(p, name, value, usage)
-	c.order = append(c.order, converterOrderName{value: name})
-}
-
-// Initialize the parser with all section and parameter.
-func (c *Converter) InitParse() {
-	c.AddSection("Output")
-	c.AddStringParam(&c.Options.Input, "input", "", "Source of comic to convert: directory, cbz, zip, cbr, rar, pdf")
-	c.AddStringParam(&c.Options.Output, "output", "", "Output of the EPUB (directory or EPUB): (default [INPUT].epub)")
-	c.AddStringParam(&c.Options.Author, "author", "GO Comic Converter", "Author of the EPUB")
-	c.AddStringParam(&c.Options.Title, "title", "", "Title of the EPUB")
-
-	c.AddSection("Config")
-	c.AddStringParam(&c.Options.Profile, "profile", c.Options.Profile, fmt.Sprintf("Profile to use: \n%s", c.Options.AvailableProfiles()))
-	c.AddIntParam(&c.Options.Quality, "quality", c.Options.Quality, "Quality of the image")
-	c.AddBoolParam(&c.Options.Grayscale, "grayscale", c.Options.Grayscale, "Grayscale image. Ideal for eInk devices.")
-	c.AddIntParam(&c.Options.GrayscaleMode, "grayscale-mode", c.Options.GrayscaleMode, "Grayscale Mode\n0 = normal\n1 = average\n2 = luminance")
-	c.AddBoolParam(&c.Options.Crop, "crop", c.Options.Crop, "Crop images")
-	c.AddIntParam(&c.Options.CropRatioLeft, "crop-ratio-left", c.Options.CropRatioLeft, "Crop ratio left: ratio of pixels allow to be non blank while cutting on the left.")
-	c.AddIntParam(&c.Options.CropRatioUp, "crop-ratio-up", c.Options.CropRatioUp, "Crop ratio up: ratio of pixels allow to be non blank while cutting on the top.")
-	c.AddIntParam(&c.Options.CropRatioRight, "crop-ratio-right", c.Options.CropRatioRight, "Crop ratio right: ratio of pixels allow to be non blank while cutting on the right.")
-	c.AddIntParam(&c.Options.CropRatioBottom, "crop-ratio-bottom", c.Options.CropRatioBottom, "Crop ratio bottom: ratio of pixels allow to be non blank while cutting on the bottom.")
-	c.AddIntParam(&c.Options.Brightness, "brightness", c.Options.Brightness, "Brightness readjustement: between -100 and 100, > 0 lighter, < 0 darker")
-	c.AddIntParam(&c.Options.Contrast, "contrast", c.Options.Contrast, "Contrast readjustement: between -100 and 100, > 0 more contrast, < 0 less contrast")
-	c.AddBoolParam(&c.Options.AutoContrast, "autocontrast", c.Options.AutoContrast, "Improve contrast automatically")
-	c.AddBoolParam(&c.Options.AutoRotate, "autorotate", c.Options.AutoRotate, "Auto Rotate page when width > height")
-	c.AddBoolParam(&c.Options.AutoSplitDoublePage, "autosplitdoublepage", c.Options.AutoSplitDoublePage, "Auto Split double page when width > height")
-	c.AddBoolParam(&c.Options.NoBlankImage, "noblankimage", c.Options.NoBlankImage, "Remove blank image")
-	c.AddBoolParam(&c.Options.Manga, "manga", c.Options.Manga, "Manga mode (right to left)")
-	c.AddBoolParam(&c.Options.HasCover, "hascover", c.Options.HasCover, "Has cover. Indicate if your comic have a cover. The first page will be used as a cover and include after the title.")
-	c.AddIntParam(&c.Options.LimitMb, "limitmb", c.Options.LimitMb, "Limit size of the EPUB: Default nolimit (0), Minimum 20")
-	c.AddBoolParam(&c.Options.StripFirstDirectoryFromToc, "strip", c.Options.StripFirstDirectoryFromToc, "Strip first directory from the TOC if only 1")
-	c.AddIntParam(&c.Options.SortPathMode, "sort", c.Options.SortPathMode, "Sort path mode\n0 = alpha for path and file\n1 = alphanum for path and alpha for file\n2 = alphanum for path and file")
-	c.AddStringParam(&c.Options.ForegroundColor, "foreground-color", c.Options.ForegroundColor, "Foreground color in hexa format RGB. Black=000, White=FFF")
-	c.AddStringParam(&c.Options.BackgroundColor, "background-color", c.Options.BackgroundColor, "Background color in hexa format RGB. Black=000, White=FFF, Light Gray=DDD, Dark Gray=777")
-	c.AddBoolParam(&c.Options.NoResize, "noresize", c.Options.NoResize, "Do not reduce image size if exceed device size")
-	c.AddStringParam(&c.Options.Format, "format", c.Options.Format, "Format of output images: jpeg (lossy), png (lossless)")
-	c.AddFloatParam(&c.Options.AspectRatio, "aspect-ratio", c.Options.AspectRatio, "Aspect ratio (height/width) of the output\n -1 = same as device\n  0 = same as source\n1.6 = amazon advice for kindle")
-	c.AddBoolParam(&c.Options.PortraitOnly, "portrait-only", c.Options.PortraitOnly, "Portrait only: force orientation to portrait only.")
-	c.AddIntParam(&c.Options.TitlePage, "titlepage", c.Options.TitlePage, "Title page\n0 = never\n1 = always\n2 = only if epub is splitted")
-
-	c.AddSection("Default config")
-	c.AddBoolParam(&c.Options.Show, "show", false, "Show your default parameters")
-	c.AddBoolParam(&c.Options.Save, "save", false, "Save your parameters as default")
-	c.AddBoolParam(&c.Options.Reset, "reset", false, "Reset your parameters to default")
-
-	c.AddSection("Shortcut")
-	c.AddBoolParam(&c.Options.Auto, "auto", false, "Activate all automatic options")
-	c.AddBoolParam(&c.Options.NoFilter, "nofilter", false, "Deactivate all filters")
-	c.AddBoolParam(&c.Options.MaxQuality, "maxquality", false, "Max quality: color png + noresize")
-	c.AddBoolParam(&c.Options.BestQuality, "bestquality", false, "Max quality: color jpg q100 + noresize")
-	c.AddBoolParam(&c.Options.GreatQuality, "greatquality", false, "Max quality: grayscale jpg q90 + noresize")
-	c.AddBoolParam(&c.Options.GoodQuality, "goodquality", false, "Max quality: grayscale jpg q90")
-
-	c.AddSection("Other")
-	c.AddIntParam(&c.Options.Workers, "workers", runtime.NumCPU(), "Number of workers")
-	c.AddBoolParam(&c.Options.Dry, "dry", false, "Dry run to show all options")
-	c.AddBoolParam(&c.Options.DryVerbose, "dry-verbose", false, "Display also sorted files after the TOC")
-	c.AddBoolParam(&c.Options.Quiet, "quiet", false, "Disable progress bar")
-	c.AddBoolParam(&c.Options.Version, "version", false, "Show current and available version")
-	c.AddBoolParam(&c.Options.Help, "help", false, "Show this help message")
-}
-
-// Customize version of FlagSet.PrintDefaults
-func (c *Converter) Usage(isString bool, f *flag.Flag) string {
-	var b strings.Builder
-	fmt.Fprintf(&b, "  -%s", f.Name) // Two spaces before -; see next two comments.
-	name, usage := flag.UnquoteUsage(f)
-	if len(name) > 0 {
-		b.WriteString(" ")
-		b.WriteString(name)
-	}
-	// Print the default value only if it differs to the zero value
-	// for this flag type.
-	if isZero, err := c.isZeroValue(f, f.DefValue); err != nil {
-		c.isZeroValueErrs = append(c.isZeroValueErrs, err)
-	} else if !isZero {
-		if isString {
-			fmt.Fprintf(&b, " (default %q)", f.DefValue)
-		} else {
-			fmt.Fprintf(&b, " (default %v)", f.DefValue)
-		}
-	}
-
-	// Boolean flags of one ASCII letter are so common we
-	// treat them specially, putting their usage on the same line.
-	if b.Len() <= 4 { // space, space, '-', 'x'.
-		b.WriteString("\t")
-	} else {
-		// Four spaces before the tab triggers good alignment
-		// for both 4- and 8-space tab stops.
-		b.WriteString("\n    \t")
-	}
-	b.WriteString(strings.ReplaceAll(usage, "\n", "\n    \t"))
-
-	return b.String()
-}
-
-// Taken from flag package as it is private and needed for usage.
-//
-// isZeroValue determines whether the string represents the zero
-// value for a flag.
-func (c *Converter) isZeroValue(f *flag.Flag, value string) (ok bool, err error) {
-	// Build a zero value of the flag's Value type, and see if the
-	// result of calling its String method equals the value passed in.
-	// This works unless the Value type is itself an interface type.
-	typ := reflect.TypeOf(f.Value)
-	var z reflect.Value
-	if typ.Kind() == reflect.Pointer {
-		z = reflect.New(typ.Elem())
-	} else {
-		z = reflect.Zero(typ)
-	}
-	// Catch panics calling the String method, which shouldn't prevent the
-	// usage message from being printed, but that we should report to the
-	// user so that they know to fix their code.
-	defer func() {
-		if e := recover(); e != nil {
-			if typ.Kind() == reflect.Pointer {
-				typ = typ.Elem()
-			}
-			err = fmt.Errorf("panic calling String method on zero %v for flag %s: %v", typ, f.Name, e)
-		}
-	}()
-	return value == z.Interface().(flag.Value).String(), nil
-}
-
-// Parse all parameters
-func (c *Converter) Parse() {
-	c.Cmd.Parse(os.Args[1:])
-	if c.Options.Help {
-		c.Cmd.Usage()
-		os.Exit(0)
-	}
-
-	if c.Options.Auto {
-		c.Options.AutoContrast = true
-		c.Options.AutoRotate = true
-		c.Options.AutoSplitDoublePage = true
-	}
-
-	if c.Options.MaxQuality {
-		c.Options.Format = "png"
-		c.Options.Grayscale = false
-		c.Options.NoResize = true
-	} else if c.Options.BestQuality {
-		c.Options.Format = "jpeg"
-		c.Options.Quality = 100
-		c.Options.Grayscale = false
-		c.Options.NoResize = true
-	} else if c.Options.GreatQuality {
-		c.Options.Format = "jpeg"
-		c.Options.Quality = 90
-		c.Options.Grayscale = true
-		c.Options.NoResize = true
-	} else if c.Options.GoodQuality {
-		c.Options.Format = "jpeg"
-		c.Options.Quality = 90
-		c.Options.Grayscale = true
-		c.Options.NoResize = false
-	}
-
-	if c.Options.NoFilter {
-		c.Options.Crop = false
-		c.Options.Brightness = 0
-		c.Options.Contrast = 0
-		c.Options.AutoContrast = false
-		c.Options.AutoRotate = false
-		c.Options.NoBlankImage = false
-		c.Options.NoResize = true
-	}
-}
-
-// Check parameters
-func (c *Converter) Validate() error {
-	// Check input
-	if c.Options.Input == "" {
-		return errors.New("missing input")
-	}
-
-	fi, err := os.Stat(c.Options.Input)
-	if err != nil {
-		return err
-	}
-
-	// Check Output
-	var defaultOutput string
-	inputBase := filepath.Clean(c.Options.Input)
-	if fi.IsDir() {
-		defaultOutput = fmt.Sprintf("%s.epub", inputBase)
-	} else {
-		ext := filepath.Ext(inputBase)
-		defaultOutput = fmt.Sprintf("%s.epub", inputBase[0:len(inputBase)-len(ext)])
-	}
-
-	if c.Options.Output == "" {
-		c.Options.Output = defaultOutput
-	}
-
-	c.Options.Output = filepath.Clean(c.Options.Output)
-	if filepath.Ext(c.Options.Output) == ".epub" {
-		fo, err := os.Stat(filepath.Dir(c.Options.Output))
-		if err != nil {
-			return err
-		}
-		if !fo.IsDir() {
-			return errors.New("parent of the output is not a directory")
-		}
-	} else {
-		fo, err := os.Stat(c.Options.Output)
-		if err != nil {
-			return err
-		}
-		if !fo.IsDir() {
-			return errors.New("output must be an existing dir or end with .epub")
-		}
-		c.Options.Output = filepath.Join(
-			c.Options.Output,
-			filepath.Base(defaultOutput),
-		)
-	}
-
-	// Title
-	if c.Options.Title == "" {
-		ext := filepath.Ext(defaultOutput)
-		c.Options.Title = filepath.Base(defaultOutput[0 : len(defaultOutput)-len(ext)])
-	}
-
-	// Profile
-	if c.Options.Profile == "" {
-		return errors.New("profile missing")
-	}
-
-	if p := c.Options.GetProfile(); p == nil {
-		return fmt.Errorf("profile %q doesn't exists", c.Options.Profile)
-	}
-
-	// LimitMb
-	if c.Options.LimitMb < 20 && c.Options.LimitMb != 0 {
-		return errors.New("limitmb should be 0 or >= 20")
-	}
-
-	// Brightness
-	if c.Options.Brightness < -100 || c.Options.Brightness > 100 {
-		return errors.New("brightness should be between -100 and 100")
-	}
-
-	// Contrast
-	if c.Options.Contrast < -100 || c.Options.Contrast > 100 {
-		return errors.New("contrast should be between -100 and 100")
-	}
-
-	// SortPathMode
-	if c.Options.SortPathMode < 0 || c.Options.SortPathMode > 2 {
-		return errors.New("sort should be 0, 1 or 2")
-	}
-
-	// Color
-	colorRegex := regexp.MustCompile("^[0-9A-F]{3}$")
-	if !colorRegex.MatchString(c.Options.ForegroundColor) {
-		return errors.New("foreground color must have color format in hexa: [0-9A-F]{3}")
-	}
-
-	if !colorRegex.MatchString(c.Options.BackgroundColor) {
-		return errors.New("background color must have color format in hexa: [0-9A-F]{3}")
-	}
-
-	// Format
-	if !(c.Options.Format == "jpeg" || c.Options.Format == "png") {
-		return errors.New("format should be jpeg or png")
-	}
-
-	// Aspect Ratio
-	if c.Options.AspectRatio < 0 && c.Options.AspectRatio != -1 {
-		return errors.New("aspect ratio should be -1, 0 or > 0")
-	}
-
-	// Title Page
-	if c.Options.TitlePage < 0 || c.Options.TitlePage > 2 {
-		return errors.New("title page should be 0, 1 or 2")
-	}
-
-	// Grayscale Mode
-	if c.Options.GrayscaleMode < 0 || c.Options.GrayscaleMode > 2 {
-		return errors.New("grayscale mode should be 0, 1 or 2")
-	}
-
-	return nil
-}
-
-// Helper to show usage, err and exit 1
-func (c *Converter) Fatal(err error) {
-	c.Cmd.Usage()
-	fmt.Fprintf(os.Stderr, "\nError: %s\n", err)
-	os.Exit(1)
-}
-
-func (c *Converter) Stats() {
-	// Display elapse time and memory usage
-	var mem runtime.MemStats
-	runtime.ReadMemStats(&mem)
-	fmt.Fprintf(
-		os.Stderr,
-		"Completed in %s, Memory usage %d Mb\n",
-		time.Since(c.startAt).Round(time.Millisecond),
-		mem.Sys/1024/1024,
-	)
-}

internal/converter/options/converter_options.go

@@ -1,254 +0,0 @@
-/*
-Manage options with default value from config.
-*/
-package options
-
-import (
-	"fmt"
-	"os"
-	"path/filepath"
-	"strings"
-
-	"github.com/celogeek/go-comic-converter/v2/internal/converter/profiles"
-	"gopkg.in/yaml.v3"
-)
-
-type Options struct {
-	// Output
-	Input  string `yaml:"-"`
-	Output string `yaml:"-"`
-	Author string `yaml:"-"`
-	Title  string `yaml:"-"`
-
-	// Config
-	Profile                    string  `yaml:"profile"`
-	Quality                    int     `yaml:"quality"`
-	Grayscale                  bool    `yaml:"grayscale"`
-	GrayscaleMode              int     `yaml:"grayscale_mode"` // 0 = normal, 1 = average, 2 = luminance
-	Crop                       bool    `yaml:"crop"`
-	CropRatioLeft              int     `yaml:"crop_ratio_left"`
-	CropRatioUp                int     `yaml:"crop_ratio_up"`
-	CropRatioRight             int     `yaml:"crop_ratio_right"`
-	CropRatioBottom            int     `yaml:"crop_ratio_bottom"`
-	Brightness                 int     `yaml:"brightness"`
-	Contrast                   int     `yaml:"contrast"`
-	AutoContrast               bool    `yaml:"auto_contrast"`
-	AutoRotate                 bool    `yaml:"auto_rotate"`
-	AutoSplitDoublePage        bool    `yaml:"auto_split_double_page"`
-	NoBlankImage               bool    `yaml:"no_blank_image"`
-	Manga                      bool    `yaml:"manga"`
-	HasCover                   bool    `yaml:"has_cover"`
-	LimitMb                    int     `yaml:"limit_mb"`
-	StripFirstDirectoryFromToc bool    `yaml:"strip_first_directory_from_toc"`
-	SortPathMode               int     `yaml:"sort_path_mode"`
-	ForegroundColor            string  `yaml:"foreground_color"`
-	BackgroundColor            string  `yaml:"background_color"`
-	NoResize                   bool    `yaml:"noresize"`
-	Format                     string  `yaml:"format"`
-	AspectRatio                float64 `yaml:"aspect_ratio"`
-	PortraitOnly               bool    `yaml:"portrait_only"`
-	TitlePage                  int     `yaml:"title_page"`
-
-	// Default Config
-	Show  bool `yaml:"-"`
-	Save  bool `yaml:"-"`
-	Reset bool `yaml:"-"`
-
-	// Shortcut
-	Auto         bool `yaml:"-"`
-	NoFilter     bool `yaml:"-"`
-	MaxQuality   bool `yaml:"-"`
-	BestQuality  bool `yaml:"-"`
-	GreatQuality bool `yaml:"-"`
-	GoodQuality  bool `yaml:"-"`
-
-	// Other
-	Workers    int  `yaml:"-"`
-	Dry        bool `yaml:"-"`
-	DryVerbose bool `yaml:"-"`
-	Quiet      bool `yaml:"-"`
-	Version    bool `yaml:"-"`
-	Help       bool `yaml:"-"`
-
-	// Internal
-	profiles profiles.Profiles
-}
-
-// Initialize default options.
-func New() *Options {
-	return &Options{
-		Quality:         85,
-		Grayscale:       true,
-		Crop:            true,
-		CropRatioLeft:   1,
-		CropRatioUp:     1,
-		CropRatioRight:  1,
-		CropRatioBottom: 3,
-		NoBlankImage:    true,
-		HasCover:        true,
-		SortPathMode:    1,
-		ForegroundColor: "000",
-		BackgroundColor: "FFF",
-		Format:          "jpeg",
-		TitlePage:       1,
-		profiles:        profiles.New(),
-	}
-}
-
-func (o *Options) Header() string {
-	return "Go Comic Converter\n\nOptions:"
-}
-
-func (o *Options) String() string {
-	var b strings.Builder
-	b.WriteString(o.Header())
-	for _, v := range []struct {
-		K string
-		V any
-	}{
-		{"Input", o.Input},
-		{"Output", o.Output},
-		{"Author", o.Author},
-		{"Title", o.Title},
-		{"Workers", o.Workers},
-	} {
-		b.WriteString(fmt.Sprintf("\n    %-26s: %v", v.K, v.V))
-	}
-	b.WriteString(o.ShowConfig())
-	b.WriteRune('\n')
-	return b.String()
-}
-
-// Config file: ~/.go-comic-converter.yaml
-func (o *Options) FileName() string {
-	home, _ := os.UserHomeDir()
-	return filepath.Join(home, ".go-comic-converter.yaml")
-}
-
-// Load config files
-func (o *Options) LoadConfig() error {
-	f, err := os.Open(o.FileName())
-	if err != nil {
-		return nil
-	}
-	defer f.Close()
-	err = yaml.NewDecoder(f).Decode(o)
-	if err != nil && err.Error() != "EOF" {
-		return err
-	}
-
-	return nil
-}
-
-// Get current settings for fields that can be saved
-func (o *Options) ShowConfig() string {
-	var profileDesc string
-	profile := o.GetProfile()
-	if profile != nil {
-		profileDesc = fmt.Sprintf(
-			"%s - %s - %dx%d",
-			o.Profile,
-			profile.Description,
-			profile.Width,
-			profile.Height,
-		)
-	}
-
-	sortpathmode := ""
-	switch o.SortPathMode {
-	case 0:
-		sortpathmode = "path=alpha, file=alpha"
-	case 1:
-		sortpathmode = "path=alphanum, file=alpha"
-	case 2:
-		sortpathmode = "path=alphanum, file=alphanum"
-	}
-
-	aspectRatio := "auto"
-	if o.AspectRatio > 0 {
-		aspectRatio = fmt.Sprintf("1:%.02f", o.AspectRatio)
-	} else if o.AspectRatio < 0 {
-		aspectRatio = fmt.Sprintf("1:%0.2f (device)", float64(profile.Height)/float64(profile.Width))
-	}
-
-	titlePage := ""
-	switch o.TitlePage {
-	case 0:
-		titlePage = "never"
-	case 1:
-		titlePage = "always"
-	case 2:
-		titlePage = "when epub is splitted"
-	}
-
-	grayscaleMode := "normal"
-	switch o.GrayscaleMode {
-	case 1:
-		grayscaleMode = "average"
-	case 2:
-		grayscaleMode = "luminance"
-	}
-
-	var b strings.Builder
-	for _, v := range []struct {
-		Key       string
-		Value     any
-		Condition bool
-	}{
-		{"Profile", profileDesc, true},
-		{"Format", o.Format, true},
-		{"Quality", o.Quality, o.Format == "jpeg"},
-		{"Grayscale", o.Grayscale, true},
-		{"Grayscale Mode", grayscaleMode, o.Grayscale},
-		{"Crop", o.Crop, true},
-		{"CropRatio", fmt.Sprintf("%d Left - %d Up - %d Right - %d Bottom", o.CropRatioLeft, o.CropRatioUp, o.CropRatioRight, o.CropRatioBottom), o.Crop},
-		{"Brightness", o.Brightness, o.Brightness != 0},
-		{"Contrast", o.Contrast, o.Contrast != 0},
-		{"AutoContrast", o.AutoContrast, true},
-		{"AutoRotate", o.AutoRotate, true},
-		{"AutoSplitDoublePage", o.AutoSplitDoublePage, true},
-		{"NoBlankImage", o.NoBlankImage, true},
-		{"Manga", o.Manga, true},
-		{"HasCover", o.HasCover, true},
-		{"LimitMb", fmt.Sprintf("%d Mb", o.LimitMb), o.LimitMb != 0},
-		{"StripFirstDirectoryFromToc", o.StripFirstDirectoryFromToc, true},
-		{"SortPathMode", sortpathmode, true},
-		{"Foreground Color", fmt.Sprintf("#%s", o.ForegroundColor), true},
-		{"Background Color", fmt.Sprintf("#%s", o.BackgroundColor), true},
-		{"Resize", !o.NoResize, true},
-		{"Aspect Ratio", aspectRatio, true},
-		{"Portrait Only", o.PortraitOnly, true},
-		{"Title Page", titlePage, true},
-	} {
-		if v.Condition {
-			b.WriteString(fmt.Sprintf("\n    %-26s: %v", v.Key, v.Value))
-		}
-	}
-	return b.String()
-}
-
-// reset all settings to default value
-func (o *Options) ResetConfig() error {
-	New().SaveConfig()
-	return o.LoadConfig()
-}
-
-// save all current settings as futur default value
-func (o *Options) SaveConfig() error {
-	f, err := os.Create(o.FileName())
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-	return yaml.NewEncoder(f).Encode(o)
-}
-
-// shortcut to get current profile
-func (o *Options) GetProfile() *profiles.Profile {
-	return o.profiles.Get(o.Profile)
-}
-
-// all available profiles
-func (o *Options) AvailableProfiles() string {
-	return o.profiles.String()
-}

internal/epub/epub.go

@@ -1,457 +0,0 @@
-/*
-Tools to create EPUB from images.
-*/
-package epub
-
-import (
-	"archive/zip"
-	"fmt"
-	"math"
-	"os"
-	"path/filepath"
-	"regexp"
-	"sort"
-	"strings"
-	"text/template"
-	"time"
-
-	epubimage "github.com/celogeek/go-comic-converter/v2/internal/epub/image"
-	epubimageprocessor "github.com/celogeek/go-comic-converter/v2/internal/epub/imageprocessor"
-	epuboptions "github.com/celogeek/go-comic-converter/v2/internal/epub/options"
-	epubprogress "github.com/celogeek/go-comic-converter/v2/internal/epub/progress"
-	epubtemplates "github.com/celogeek/go-comic-converter/v2/internal/epub/templates"
-	epubtree "github.com/celogeek/go-comic-converter/v2/internal/epub/tree"
-	epubzip "github.com/celogeek/go-comic-converter/v2/internal/epub/zip"
-	"github.com/gofrs/uuid"
-)
-
-type ePub struct {
-	*epuboptions.Options
-	UID       string
-	Publisher string
-	UpdatedAt string
-
-	templateProcessor *template.Template
-	imageProcessor    *epubimageprocessor.EPUBImageProcessor
-}
-
-type epubPart struct {
-	Cover  *epubimage.Image
-	Images []*epubimage.Image
-	Reader *zip.ReadCloser
-}
-
-// initialize EPUB
-func New(options *epuboptions.Options) *ePub {
-	uid := uuid.Must(uuid.NewV4())
-	tmpl := template.New("parser")
-	tmpl.Funcs(template.FuncMap{
-		"mod":  func(i, j int) bool { return i%j == 0 },
-		"zoom": func(s int, z float32) int { return int(float32(s) * z) },
-	})
-
-	return &ePub{
-		Options:           options,
-		UID:               uid.String(),
-		Publisher:         "GO Comic Converter",
-		UpdatedAt:         time.Now().UTC().Format("2006-01-02T15:04:05Z"),
-		templateProcessor: tmpl,
-		imageProcessor:    epubimageprocessor.New(options),
-	}
-}
-
-// render templates
-func (e *ePub) render(templateString string, data map[string]any) string {
-	var result strings.Builder
-	tmpl := template.Must(e.templateProcessor.Parse(templateString))
-	if err := tmpl.Execute(&result, data); err != nil {
-		panic(err)
-	}
-	return regexp.MustCompile("\n+").ReplaceAllString(result.String(), "\n")
-}
-
-// write image to the zip
-func (e *ePub) writeImage(wz *epubzip.EPUBZip, img *epubimage.Image, zipImg *zip.File) error {
-	err := wz.WriteContent(
-		img.EPUBPagePath(),
-		[]byte(e.render(epubtemplates.Text, map[string]any{
-			"Title":      fmt.Sprintf("Image %d Part %d", img.Id, img.Part),
-			"ViewPort":   fmt.Sprintf("width=%d,height=%d", e.Image.View.Width, e.Image.View.Height),
-			"ImagePath":  img.ImgPath(),
-			"ImageStyle": img.ImgStyle(e.Image.View.Width, e.Image.View.Height, ""),
-		})),
-	)
-	if err == nil {
-		err = wz.Copy(zipImg)
-	}
-
-	return err
-}
-
-// write blank page
-func (e *ePub) writeBlank(wz *epubzip.EPUBZip, img *epubimage.Image) error {
-	return wz.WriteContent(
-		img.EPUBSpacePath(),
-		[]byte(e.render(epubtemplates.Blank, map[string]any{
-			"Title":    fmt.Sprintf("Blank Page %d", img.Id),
-			"ViewPort": fmt.Sprintf("width=%d,height=%d", e.Image.View.Width, e.Image.View.Height),
-		})),
-	)
-}
-
-// write title image
-func (e *ePub) writeCoverImage(wz *epubzip.EPUBZip, img *epubimage.Image, part, totalParts int) error {
-	title := "Cover"
-	text := ""
-	if totalParts > 1 {
-		text = fmt.Sprintf("%d / %d", part, totalParts)
-		title = fmt.Sprintf("%s %s", title, text)
-	}
-
-	if err := wz.WriteContent(
-		"OEBPS/Text/cover.xhtml",
-		[]byte(e.render(epubtemplates.Text, map[string]any{
-			"Title":      title,
-			"ViewPort":   fmt.Sprintf("width=%d,height=%d", e.Image.View.Width, e.Image.View.Height),
-			"ImagePath":  fmt.Sprintf("Images/cover.%s", e.Image.Format),
-			"ImageStyle": img.ImgStyle(e.Image.View.Width, e.Image.View.Height, ""),
-		})),
-	); err != nil {
-		return err
-	}
-
-	coverTitle, err := e.imageProcessor.CoverTitleData(&epubimageprocessor.CoverTitleDataOptions{
-		Src:         img.Raw,
-		Name:        "cover",
-		Text:        text,
-		Align:       "bottom",
-		PctWidth:    50,
-		PctMargin:   50,
-		MaxFontSize: 96,
-		BorderSize:  8,
-	})
-
-	if err != nil {
-		return err
-	}
-
-	if err := wz.WriteRaw(coverTitle); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-// write title image
-func (e *ePub) writeTitleImage(wz *epubzip.EPUBZip, img *epubimage.Image, title string) error {
-	titleAlign := ""
-	if !e.Image.View.PortraitOnly {
-		if e.Image.Manga {
-			titleAlign = "right:0"
-		} else {
-			titleAlign = "left:0"
-		}
-	}
-
-	if !e.Image.View.PortraitOnly {
-		if err := wz.WriteContent(
-			"OEBPS/Text/space_title.xhtml",
-			[]byte(e.render(epubtemplates.Blank, map[string]any{
-				"Title":    "Blank Page Title",
-				"ViewPort": fmt.Sprintf("width=%d,height=%d", e.Image.View.Width, e.Image.View.Height),
-			})),
-		); err != nil {
-			return err
-		}
-	}
-
-	if err := wz.WriteContent(
-		"OEBPS/Text/title.xhtml",
-		[]byte(e.render(epubtemplates.Text, map[string]any{
-			"Title":      title,
-			"ViewPort":   fmt.Sprintf("width=%d,height=%d", e.Image.View.Width, e.Image.View.Height),
-			"ImagePath":  fmt.Sprintf("Images/title.%s", e.Image.Format),
-			"ImageStyle": img.ImgStyle(e.Image.View.Width, e.Image.View.Height, titleAlign),
-		})),
-	); err != nil {
-		return err
-	}
-
-	coverTitle, err := e.imageProcessor.CoverTitleData(&epubimageprocessor.CoverTitleDataOptions{
-		Src:         img.Raw,
-		Name:        "title",
-		Text:        title,
-		Align:       "center",
-		PctWidth:    100,
-		PctMargin:   100,
-		MaxFontSize: 64,
-		BorderSize:  4,
-	})
-	if err != nil {
-		return err
-	}
-
-	if err := wz.WriteRaw(coverTitle); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-// extract image and split it into part
-func (e *ePub) getParts() (parts []*epubPart, imgStorage *epubzip.EPUBZipStorageImageReader, err error) {
-	images, err := e.imageProcessor.Load()
-
-	if err != nil {
-		return nil, nil, err
-	}
-
-	// sort result by id and part
-	sort.Slice(images, func(i, j int) bool {
-		if images[i].Id == images[j].Id {
-			return images[i].Part < images[j].Part
-		}
-		return images[i].Id < images[j].Id
-	})
-
-	parts = make([]*epubPart, 0)
-	cover := images[0]
-	if e.Image.HasCover {
-		images = images[1:]
-	}
-
-	if e.Dry {
-		parts = append(parts, &epubPart{
-			Cover:  cover,
-			Images: images,
-		})
-		return parts, nil, nil
-	}
-
-	imgStorage, err = epubzip.NewEPUBZipStorageImageReader(e.ImgStorage())
-	if err != nil {
-		return nil, nil, err
-	}
-
-	// compute size of the EPUB part and try to be as close as possible of the target
-	maxSize := uint64(e.LimitMb * 1024 * 1024)
-	xhtmlSize := uint64(1024)
-	// descriptor files + title + cover
-	baseSize := uint64(16*1024) + imgStorage.Size(cover.EPUBImgPath())*2
-
-	currentSize := baseSize
-	currentImages := make([]*epubimage.Image, 0)
-	part := 1
-
-	for _, img := range images {
-		imgSize := imgStorage.Size(img.EPUBImgPath()) + xhtmlSize
-		if maxSize > 0 && len(currentImages) > 0 && currentSize+imgSize > maxSize {
-			parts = append(parts, &epubPart{
-				Cover:  cover,
-				Images: currentImages,
-			})
-			part += 1
-			currentSize = baseSize
-			currentImages = make([]*epubimage.Image, 0)
-		}
-		currentSize += imgSize
-		currentImages = append(currentImages, img)
-	}
-	if len(currentImages) > 0 {
-		parts = append(parts, &epubPart{
-			Cover:  cover,
-			Images: currentImages,
-		})
-	}
-
-	return parts, imgStorage, nil
-}
-
-// create a tree from the directories.
-//
-// this is used to simulate the toc.
-func (e *ePub) getTree(images []*epubimage.Image, skip_files bool) string {
-	t := epubtree.New()
-	for _, img := range images {
-		if skip_files {
-			t.Add(img.Path)
-		} else {
-			t.Add(filepath.Join(img.Path, img.Name))
-		}
-	}
-	c := t.Root()
-	if skip_files && e.StripFirstDirectoryFromToc && len(c.Children) == 1 {
-		c = c.Children[0]
-	}
-
-	return c.WriteString("")
-}
-
-func (e *ePub) computeAspectRatio(epubParts []*epubPart) float64 {
-	var (
-		bestAspectRatio      float64
-		bestAspectRatioCount int
-		aspectRatio          = map[float64]int{}
-	)
-
-	trunc := func(v float64) float64 {
-		return float64(math.Round(v*10000)) / 10000
-	}
-
-	for _, p := range epubParts {
-		aspectRatio[trunc(p.Cover.OriginalAspectRatio)]++
-		for _, i := range p.Images {
-			aspectRatio[trunc(i.OriginalAspectRatio)]++
-		}
-	}
-
-	for k, v := range aspectRatio {
-		if v > bestAspectRatioCount {
-			bestAspectRatio, bestAspectRatioCount = k, v
-		}
-	}
-
-	return bestAspectRatio
-}
-
-func (e *ePub) computeViewPort(epubParts []*epubPart) {
-	if e.Image.View.AspectRatio == -1 {
-		return //keep device size
-	}
-
-	// readjusting view port
-	bestAspectRatio := e.Image.View.AspectRatio
-	if bestAspectRatio == 0 {
-		bestAspectRatio = e.computeAspectRatio(epubParts)
-	}
-
-	viewWidth, viewHeight := int(float64(e.Image.View.Height)/bestAspectRatio), int(float64(e.Image.View.Width)*bestAspectRatio)
-	if viewWidth > e.Image.View.Width {
-		e.Image.View.Height = viewHeight
-	} else {
-		e.Image.View.Width = viewWidth
-	}
-}
-
-// create the zip
-func (e *ePub) Write() error {
-	type zipContent struct {
-		Name    string
-		Content string
-	}
-
-	epubParts, imgStorage, err := e.getParts()
-	if err != nil {
-		return err
-	}
-
-	if e.Dry {
-		p := epubParts[0]
-		fmt.Fprintf(os.Stderr, "TOC:\n  - %s\n%s\n", e.Title, e.getTree(p.Images, true))
-		if e.DryVerbose {
-			if e.Image.HasCover {
-				fmt.Fprintf(os.Stderr, "Cover:\n%s\n", e.getTree([]*epubimage.Image{p.Cover}, false))
-			}
-			fmt.Fprintf(os.Stderr, "Files:\n%s\n", e.getTree(p.Images, false))
-		}
-		return nil
-	}
-	defer func() {
-		imgStorage.Close()
-		imgStorage.Remove()
-	}()
-
-	totalParts := len(epubParts)
-
-	bar := epubprogress.New(epubprogress.Options{
-		Max:         totalParts,
-		Description: "Writing Part",
-		CurrentJob:  2,
-		TotalJob:    2,
-		Quiet:       e.Quiet,
-	})
-
-	e.computeViewPort(epubParts)
-	hasTitlePage := e.TitlePage == 1 || (e.TitlePage == 2 && totalParts > 1)
-	for i, part := range epubParts {
-		ext := filepath.Ext(e.Output)
-		suffix := ""
-		if totalParts > 1 {
-			fmtLen := len(fmt.Sprint(totalParts))
-			fmtPart := fmt.Sprintf(" Part %%0%dd of %%0%dd", fmtLen, fmtLen)
-			suffix = fmt.Sprintf(fmtPart, i+1, totalParts)
-		}
-
-		path := fmt.Sprintf("%s%s%s", e.Output[0:len(e.Output)-len(ext)], suffix, ext)
-		wz, err := epubzip.New(path)
-		if err != nil {
-			return err
-		}
-		defer wz.Close()
-
-		title := e.Title
-		if totalParts > 1 {
-			title = fmt.Sprintf("%s [%d/%d]", title, i+1, totalParts)
-		}
-
-		content := []zipContent{
-			{"META-INF/container.xml", epubtemplates.Container},
-			{"META-INF/com.apple.ibooks.display-options.xml", epubtemplates.AppleBooks},
-			{"OEBPS/content.opf", epubtemplates.Content(&epubtemplates.ContentOptions{
-				Title:        title,
-				HasTitlePage: hasTitlePage,
-				UID:          e.UID,
-				Author:       e.Author,
-				Publisher:    e.Publisher,
-				UpdatedAt:    e.UpdatedAt,
-				ImageOptions: e.Image,
-				Cover:        part.Cover,
-				Images:       part.Images,
-				Current:      i + 1,
-				Total:        totalParts,
-			})},
-			{"OEBPS/toc.xhtml", epubtemplates.Toc(title, hasTitlePage, e.StripFirstDirectoryFromToc, part.Images)},
-			{"OEBPS/Text/style.css", e.render(epubtemplates.Style, map[string]any{
-				"View": e.Image.View,
-			})},
-		}
-
-		if err = wz.WriteMagic(); err != nil {
-			return err
-		}
-		for _, c := range content {
-			if err := wz.WriteContent(c.Name, []byte(c.Content)); err != nil {
-				return err
-			}
-		}
-
-		if err = e.writeCoverImage(wz, part.Cover, i+1, totalParts); err != nil {
-			return err
-		}
-
-		if hasTitlePage {
-			if err = e.writeTitleImage(wz, part.Cover, title); err != nil {
-				return err
-			}
-		}
-
-		lastImage := part.Images[len(part.Images)-1]
-		for _, img := range part.Images {
-			if err := e.writeImage(wz, img, imgStorage.Get(img.EPUBImgPath())); err != nil {
-				return err
-			}
-
-			// Double Page or Last Image that is not a double page
-			if !e.Image.View.PortraitOnly && (img.DoublePage || (img.Part == 0 && img == lastImage)) {
-				if err := e.writeBlank(wz, img); err != nil {
-					return err
-				}
-			}
-		}
-		bar.Add(1)
-	}
-	bar.Close()
-	fmt.Fprintln(os.Stderr)
-
-	return nil
-}

internal/epub/image/epub_image.go

@@ -1,122 +0,0 @@
-/*
-Image helpers to transform image.
-*/
-package epubimage
-
-import (
-	"fmt"
-	"image"
-	"strings"
-)
-
-type Image struct {
-	Id                  int
-	Part                int
-	Raw                 image.Image
-	Width               int
-	Height              int
-	IsCover             bool
-	IsBlank             bool
-	DoublePage          bool
-	Path                string
-	Name                string
-	Position            string
-	Format              string
-	OriginalAspectRatio float64
-}
-
-// key name of the blank plage after the image
-func (i *Image) SpaceKey() string {
-	return fmt.Sprintf("space_%d", i.Id)
-}
-
-// path of the blank page
-func (i *Image) SpacePath() string {
-	return fmt.Sprintf("Text/%s.xhtml", i.SpaceKey())
-}
-
-// path of the blank page into the EPUB
-func (i *Image) EPUBSpacePath() string {
-	return fmt.Sprintf("OEBPS/%s", i.SpacePath())
-}
-
-// key for page
-func (i *Image) PageKey() string {
-	return fmt.Sprintf("page_%d_p%d", i.Id, i.Part)
-}
-
-// page path linked to the image
-func (i *Image) PagePath() string {
-	return fmt.Sprintf("Text/%s.xhtml", i.PageKey())
-}
-
-// page path into the EPUB
-func (i *Image) EPUBPagePath() string {
-	return fmt.Sprintf("OEBPS/%s", i.PagePath())
-}
-
-// key for image
-func (i *Image) ImgKey() string {
-	return fmt.Sprintf("img_%d_p%d", i.Id, i.Part)
-}
-
-// image path
-func (i *Image) ImgPath() string {
-	return fmt.Sprintf("Images/%s.%s", i.ImgKey(), i.Format)
-}
-
-// image path into the EPUB
-func (i *Image) EPUBImgPath() string {
-	return fmt.Sprintf("OEBPS/%s", i.ImgPath())
-}
-
-// style to apply to the image.
-//
-// center by default.
-// align to left or right if it's part of the splitted double page.
-func (i *Image) ImgStyle(viewWidth, viewHeight int, align string) string {
-	relWidth, relHeight := i.RelSize(viewWidth, viewHeight)
-	marginW, marginH := float64(viewWidth-relWidth)/2, float64(viewHeight-relHeight)/2
-
-	style := []string{}
-
-	style = append(style, fmt.Sprintf("width:%dpx", relWidth))
-	style = append(style, fmt.Sprintf("height:%dpx", relHeight))
-	style = append(style, fmt.Sprintf("top:%.2f%%", marginH*100/float64(viewHeight)))
-	if align == "" {
-		switch i.Position {
-		case "rendition:page-spread-left":
-			style = append(style, "right:0")
-		case "rendition:page-spread-right":
-			style = append(style, "left:0")
-		default:
-			style = append(style, fmt.Sprintf("left:%.2f%%", marginW*100/float64(viewWidth)))
-		}
-	} else {
-		style = append(style, align)
-	}
-
-	return strings.Join(style, "; ")
-}
-
-func (i *Image) RelSize(viewWidth, viewHeight int) (relWidth, relHeight int) {
-	w, h := viewWidth, viewHeight
-	srcw, srch := i.Width, i.Height
-
-	if w <= 0 || h <= 0 || srcw <= 0 || srch <= 0 {
-		return
-	}
-
-	wratio := float64(srcw) / float64(w)
-	hratio := float64(srch) / float64(h)
-
-	if wratio > hratio {
-		relWidth = w
-		relHeight = int(float64(srch)/wratio + 0.5)
-	} else {
-		relHeight = h
-		relWidth = int(float64(srcw)/hratio + 0.5)
-	}
-
-	return
-}

internal/epub/imageprocessor/epub_image_processor.go

@@ -1,333 +0,0 @@
-/*
-Extract and transform image into a compressed jpeg.
-*/
-package epubimageprocessor
-
-import (
-	"fmt"
-	"image"
-	"image/color"
-	"image/draw"
-	"os"
-	"sync"
-
-	epubimage "github.com/celogeek/go-comic-converter/v2/internal/epub/image"
-	epubimagefilters "github.com/celogeek/go-comic-converter/v2/internal/epub/imagefilters"
-	epuboptions "github.com/celogeek/go-comic-converter/v2/internal/epub/options"
-	epubprogress "github.com/celogeek/go-comic-converter/v2/internal/epub/progress"
-	epubzip "github.com/celogeek/go-comic-converter/v2/internal/epub/zip"
-	"github.com/disintegration/gift"
-)
-
-type EPUBImageProcessor struct {
-	*epuboptions.Options
-}
-
-func New(o *epuboptions.Options) *EPUBImageProcessor {
-	return &EPUBImageProcessor{o}
-}
-
-// extract and convert images
-func (e *EPUBImageProcessor) Load() (images []*epubimage.Image, err error) {
-	images = make([]*epubimage.Image, 0)
-	imageCount, imageInput, err := e.load()
-	if err != nil {
-		return nil, err
-	}
-
-	// dry run, skip convertion
-	if e.Dry {
-		for img := range imageInput {
-			images = append(images, &epubimage.Image{
-				Id:     img.Id,
-				Path:   img.Path,
-				Name:   img.Name,
-				Format: e.Image.Format,
-			})
-		}
-
-		return images, nil
-	}
-
-	imageOutput := make(chan *epubimage.Image)
-
-	// processing
-	bar := epubprogress.New(epubprogress.Options{
-		Quiet:       e.Quiet,
-		Max:         imageCount,
-		Description: "Processing",
-		CurrentJob:  1,
-		TotalJob:    2,
-	})
-	wg := &sync.WaitGroup{}
-
-	imgStorage, err := epubzip.NewEPUBZipStorageImageWriter(e.ImgStorage(), e.Image.Format)
-	if err != nil {
-		bar.Close()
-		return nil, err
-	}
-
-	wr := 50
-	if e.Image.Format == "png" {
-		wr = 100
-	}
-	for i := 0; i < e.WorkersRatio(wr); i++ {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-
-			for input := range imageInput {
-				src := input.Image
-
-				for part, dst := range e.transformImage(src, input.Id) {
-					var raw image.Image
-					if input.Id == 0 && part == 0 {
-						raw = dst
-					}
-
-					img := &epubimage.Image{
-						Id:                  input.Id,
-						Part:                part,
-						Raw:                 raw,
-						Width:               dst.Bounds().Dx(),
-						Height:              dst.Bounds().Dy(),
-						IsCover:             input.Id == 0 && part == 0,
-						IsBlank:             dst.Bounds().Dx() == 1 && dst.Bounds().Dy() == 1,
-						DoublePage:          part == 0 && src.Bounds().Dx() > src.Bounds().Dy(),
-						Path:                input.Path,
-						Name:                input.Name,
-						Format:              e.Image.Format,
-						OriginalAspectRatio: float64(src.Bounds().Dy()) / float64(src.Bounds().Dx()),
-					}
-
-					if err = imgStorage.Add(img.EPUBImgPath(), dst, e.Image.Quality); err != nil {
-						bar.Close()
-						fmt.Fprintf(os.Stderr, "error with %s: %s", input.Name, err)
-						os.Exit(1)
-					}
-					imageOutput <- img
-				}
-			}
-		}()
-	}
-
-	go func() {
-		wg.Wait()
-		imgStorage.Close()
-		close(imageOutput)
-	}()
-
-	for img := range imageOutput {
-		if img.Part == 0 {
-			bar.Add(1)
-		}
-		if e.Image.NoBlankImage && img.IsBlank {
-			continue
-		}
-		images = append(images, img)
-	}
-	bar.Close()
-
-	if len(images) == 0 {
-		return nil, errNoImagesFound
-	}
-
-	return images, nil
-}
-
-func (e *EPUBImageProcessor) createImage(src image.Image, r image.Rectangle) draw.Image {
-	if e.Options.Image.GrayScale {
-		return image.NewGray(r)
-	}
-
-	switch t := src.(type) {
-	case *image.Gray:
-		return image.NewGray(r)
-	case *image.Gray16:
-		return image.NewGray16(r)
-	case *image.RGBA:
-		return image.NewRGBA(r)
-	case *image.RGBA64:
-		return image.NewRGBA64(r)
-	case *image.NRGBA:
-		return image.NewNRGBA(r)
-	case *image.NRGBA64:
-		return image.NewNRGBA64(r)
-	case *image.Alpha:
-		return image.NewAlpha(r)
-	case *image.Alpha16:
-		return image.NewAlpha16(r)
-	case *image.CMYK:
-		return image.NewCMYK(r)
-	case *image.Paletted:
-		return image.NewPaletted(r, t.Palette)
-	default:
-		return image.NewNRGBA64(r)
-	}
-}
-
-// transform image into 1 or 3 images
-// only doublepage with autosplit has 3 versions
-func (e *EPUBImageProcessor) transformImage(src image.Image, srcId int) []image.Image {
-	var filters, splitFilters []gift.Filter
-	var images []image.Image
-
-	// Lookup for margin if crop is enable or if we want to remove blank image
-	if e.Image.Crop.Enabled || e.Image.NoBlankImage {
-		f := epubimagefilters.AutoCrop(
-			src,
-			e.Image.Crop.Left,
-			e.Image.Crop.Up,
-			e.Image.Crop.Right,
-			e.Image.Crop.Bottom,
-		)
-
-		// detect if blank image
-		size := f.Bounds(src.Bounds())
-		isBlank := size.Dx() == 0 && size.Dy() == 0
-
-		// crop is enable or if blank image with noblankimage options
-		if e.Image.Crop.Enabled || (e.Image.NoBlankImage && isBlank) {
-			filters = append(filters, f)
-			splitFilters = append(splitFilters, f)
-		}
-	}
-
-	if e.Image.AutoRotate && src.Bounds().Dx() > src.Bounds().Dy() {
-		filters = append(filters, gift.Rotate90())
-	}
-
-	if e.Image.AutoContrast {
-		f := epubimagefilters.AutoContrast()
-		filters = append(filters, f)
-		splitFilters = append(splitFilters, f)
-	}
-
-	if e.Image.Contrast != 0 {
-		f := gift.Contrast(float32(e.Image.Contrast))
-		filters = append(filters, f)
-		splitFilters = append(splitFilters, f)
-	}
-
-	if e.Image.Brightness != 0 {
-		f := gift.Brightness(float32(e.Image.Brightness))
-		filters = append(filters, f)
-		splitFilters = append(splitFilters, f)
-	}
-
-	if e.Image.Resize {
-		f := gift.ResizeToFit(e.Image.View.Width, e.Image.View.Height, gift.LanczosResampling)
-		filters = append(filters, f)
-	}
-
-	if e.Image.GrayScale {
-		var f gift.Filter
-		switch e.Image.GrayScaleMode {
-		case 1: // average
-			f = gift.ColorFunc(func(r0, g0, b0, a0 float32) (r float32, g float32, b float32, a float32) {
-				y := (r0 + g0 + b0) / 3
-				return y, y, y, a0
-			})
-		case 2: // luminance
-			f = gift.ColorFunc(func(r0, g0, b0, a0 float32) (r float32, g float32, b float32, a float32) {
-				y := 0.2126*r0 + 0.7152*g0 + 0.0722*b0
-				return y, y, y, a0
-			})
-		default:
-			f = gift.Grayscale()
-		}
-		filters = append(filters, f)
-		splitFilters = append(splitFilters, f)
-	}
-
-	filters = append(filters, epubimagefilters.Pixel())
-
-	// convert
-	{
-		g := gift.New(filters...)
-		dst := e.createImage(src, g.Bounds(src.Bounds()))
-		g.Draw(dst, src)
-		images = append(images, dst)
-	}
-
-	// auto split off
-	if !e.Image.AutoSplitDoublePage {
-		return images
-	}
-
-	// portrait, no need to split
-	if src.Bounds().Dx() <= src.Bounds().Dy() {
-		return images
-	}
-
-	// cover
-	if e.Image.HasCover && srcId == 0 {
-		return images
-	}
-
-	// convert double page
-	for _, b := range []bool{e.Image.Manga, !e.Image.Manga} {
-		g := gift.New(splitFilters...)
-		g.Add(epubimagefilters.CropSplitDoublePage(b))
-		if e.Image.Resize {
-			g.Add(gift.ResizeToFit(e.Image.View.Width, e.Image.View.Height, gift.LanczosResampling))
-		}
-		dst := e.createImage(src, g.Bounds(src.Bounds()))
-		g.Draw(dst, src)
-		images = append(images, dst)
-	}
-
-	return images
-}
-
-type CoverTitleDataOptions struct {
-	Src         image.Image
-	Name        string
-	Text        string
-	Align       string
-	PctWidth    int
-	PctMargin   int
-	MaxFontSize int
-	BorderSize  int
-}
-
-func (e *EPUBImageProcessor) Cover16LevelOfGray(bounds image.Rectangle) draw.Image {
-	return image.NewPaletted(bounds, color.Palette{
-		color.Gray{0x00},
-		color.Gray{0x11},
-		color.Gray{0x22},
-		color.Gray{0x33},
-		color.Gray{0x44},
-		color.Gray{0x55},
-		color.Gray{0x66},
-		color.Gray{0x77},
-		color.Gray{0x88},
-		color.Gray{0x99},
-		color.Gray{0xAA},
-		color.Gray{0xBB},
-		color.Gray{0xCC},
-		color.Gray{0xDD},
-		color.Gray{0xEE},
-		color.Gray{0xFF},
-	})
-}
-
-// create a title page with the cover
-func (e *EPUBImageProcessor) CoverTitleData(o *CoverTitleDataOptions) (*epubzip.ZipImage, error) {
-	// Create a blur version of the cover
-	g := gift.New(epubimagefilters.CoverTitle(o.Text, o.Align, o.PctWidth, o.PctMargin, o.MaxFontSize, o.BorderSize))
-	var dst draw.Image
-	if o.Name == "cover" && e.Image.GrayScale {
-		dst = e.Cover16LevelOfGray(o.Src.Bounds())
-	} else {
-		dst = e.createImage(o.Src, g.Bounds(o.Src.Bounds()))
-	}
-	g.Draw(dst, o.Src)
-
-	return epubzip.CompressImage(
-		fmt.Sprintf("OEBPS/Images/%s.%s", o.Name, e.Image.Format),
-		e.Image.Format,
-		dst,
-		e.Image.Quality,
-	)
-}

internal/epub/options/epub_options.go

@@ -1,68 +0,0 @@
-/*
-Options for EPUB creation.
-*/
-package epuboptions
-
-import "fmt"
-
-type Crop struct {
-	Enabled                 bool
-	Left, Up, Right, Bottom int
-}
-
-type Color struct {
-	Foreground, Background string
-}
-
-type View struct {
-	Width, Height int
-	AspectRatio   float64
-	PortraitOnly  bool
-	Color         Color
-}
-
-type Image struct {
-	Crop                *Crop
-	Quality             int
-	Brightness          int
-	Contrast            int
-	AutoContrast        bool
-	AutoRotate          bool
-	AutoSplitDoublePage bool
-	NoBlankImage        bool
-	Manga               bool
-	HasCover            bool
-	View                *View
-	GrayScale           bool
-	GrayScaleMode       int
-	Resize              bool
-	Format              string
-}
-
-type Options struct {
-	Input                      string
-	Output                     string
-	Title                      string
-	TitlePage                  int
-	Author                     string
-	LimitMb                    int
-	StripFirstDirectoryFromToc bool
-	Dry                        bool
-	DryVerbose                 bool
-	SortPathMode               int
-	Quiet                      bool
-	Workers                    int
-	Image                      *Image
-}
-
-func (o *Options) WorkersRatio(pct int) (nbWorkers int) {
-	nbWorkers = o.Workers * pct / 100
-	if nbWorkers < 1 {
-		nbWorkers = 1
-	}
-	return
-}
-
-func (o *Options) ImgStorage() string {
-	return fmt.Sprintf("%s.tmp", o.Output)
-}

internal/epub/templates/epub_templates.go

@@ -1,23 +0,0 @@
-/*
-Templates use to create xml files of the EPUB.
-*/
-package epubtemplates
-
-import _ "embed"
-
-var (
-	//go:embed "epub_templates_container.xml.tmpl"
-	Container string
-
-	//go:embed "epub_templates_applebooks.xml.tmpl"
-	AppleBooks string
-
-	//go:embed "epub_templates_style.css.tmpl"
-	Style string
-
-	//go:embed "epub_templates_text.xhtml.tmpl"
-	Text string
-
-	//go:embed "epub_templates_blank.xhtml.tmpl"
-	Blank string
-)

internal/epub/tree/epub_tree.go

@@ -1,75 +0,0 @@
-/*
-Organize a list of filename with their path into a tree of directories.
-
-Example:
-  - A/B/C/D.jpg
-  - A/B/C/E.jpg
-  - A/B/F/G.jpg
-
-This is transformed like:
-
-	A
-	 B
-	  C
-	   D.jpg
-	   E.jpg
-	 F
-	  G.jpg
-*/
-package epubtree
-
-import (
-	"path/filepath"
-	"strings"
-)
-
-type tree struct {
-	Nodes map[string]*node
-}
-
-type node struct {
-	Value    string
-	Children []*node
-}
-
-// initilize tree with a root node
-func New() *tree {
-	return &tree{map[string]*node{
-		".": {".", []*node{}},
-	}}
-}
-
-// root node
-func (n *tree) Root() *node {
-	return n.Nodes["."]
-}
-
-// add the filename to the tree
-func (n *tree) Add(filename string) {
-	cn := n.Root()
-	cp := ""
-	for _, p := range strings.Split(filepath.Clean(filename), string(filepath.Separator)) {
-		cp = filepath.Join(cp, p)
-		if _, ok := n.Nodes[cp]; !ok {
-			n.Nodes[cp] = &node{Value: p, Children: []*node{}}
-			cn.Children = append(cn.Children, n.Nodes[cp])
-		}
-		cn = n.Nodes[cp]
-	}
-}
-
-// string version of the tree
-func (n *node) WriteString(indent string) string {
-	r := strings.Builder{}
-	if indent != "" {
-		r.WriteString(indent)
-		r.WriteString("- ")
-		r.WriteString(n.Value)
-		r.WriteString("\n")
-	}
-	indent += "  "
-	for _, c := range n.Children {
-		r.WriteString(c.WriteString(indent))
-	}
-	return r.String()
-}

internal/epub/zip/epub_zip_storage_image.go

@@ -1,100 +0,0 @@
-package epubzip
-
-import (
-	"archive/zip"
-	"image"
-	"os"
-	"sync"
-)
-
-type EPUBZipStorageImageWriter struct {
-	fh     *os.File
-	fz     *zip.Writer
-	format string
-	mut    *sync.Mutex
-}
-
-func NewEPUBZipStorageImageWriter(filename string, format string) (*EPUBZipStorageImageWriter, error) {
-	fh, err := os.Create(filename)
-	if err != nil {
-		return nil, err
-	}
-	fz := zip.NewWriter(fh)
-	return &EPUBZipStorageImageWriter{fh, fz, format, &sync.Mutex{}}, nil
-}
-
-func (e *EPUBZipStorageImageWriter) Close() error {
-	if err := e.fz.Close(); err != nil {
-		e.fh.Close()
-		return err
-	}
-	return e.fh.Close()
-}
-
-func (e *EPUBZipStorageImageWriter) Add(filename string, img image.Image, quality int) error {
-	zipImage, err := CompressImage(filename, e.format, img, quality)
-	if err != nil {
-		return err
-	}
-
-	e.mut.Lock()
-	defer e.mut.Unlock()
-	fh, err := e.fz.CreateRaw(zipImage.Header)
-	if err != nil {
-		return err
-	}
-	_, err = fh.Write(zipImage.Data)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-type EPUBZipStorageImageReader struct {
-	filename string
-	fh       *os.File
-	fz       *zip.Reader
-
-	files map[string]*zip.File
-}
-
-func NewEPUBZipStorageImageReader(filename string) (*EPUBZipStorageImageReader, error) {
-	fh, err := os.Open(filename)
-	if err != nil {
-		return nil, err
-	}
-	s, err := fh.Stat()
-	if err != nil {
-		return nil, err
-	}
-	fz, err := zip.NewReader(fh, s.Size())
-	if err != nil {
-		return nil, err
-	}
-	files := map[string]*zip.File{}
-	for _, z := range fz.File {
-		files[z.Name] = z
-	}
-	return &EPUBZipStorageImageReader{filename, fh, fz, files}, nil
-}
-
-func (e *EPUBZipStorageImageReader) Get(filename string) *zip.File {
-	return e.files[filename]
-}
-
-func (e *EPUBZipStorageImageReader) Size(filename string) uint64 {
-	img := e.Get(filename)
-	if img != nil {
-		return img.CompressedSize64 + 30 + uint64(len(img.Name))
-	}
-	return 0
-}
-
-func (e *EPUBZipStorageImageReader) Close() error {
-	return e.fh.Close()
-}
-
-func (e *EPUBZipStorageImageReader) Remove() error {
-	return os.Remove(e.filename)
-}

internal/pkg/converter/converter.go

@@ -0,0 +1,437 @@
+// Package converter Helper to parse and prepare options for go-comic-converter.
+//
+// It uses goflag with additional feature:
+//   - Keep original order
+//   - Support section
+package converter
+
+import (
+	"encoding/json"
+	"errors"
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+	"reflect"
+	"regexp"
+	"runtime"
+	"slices"
+	"strings"
+	"time"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+)
+
+type Converter struct {
+	Options *Options
+	Cmd     *flag.FlagSet
+
+	order           []order
+	isZeroValueErrs []error
+	startAt         time.Time
+}
+
+// New Create a new parser
+func New() *Converter {
+	o := NewOptions()
+	cmd := flag.NewFlagSet("go-comic-converter", flag.ExitOnError)
+	conv := &Converter{
+		Options: o,
+		Cmd:     cmd,
+		order:   make([]order, 0),
+		startAt: time.Now(),
+	}
+
+	var cmdOutput strings.Builder
+	cmd.SetOutput(&cmdOutput)
+	cmd.Usage = func() {
+		utils.Printf("Usage of %s:\n", filepath.Base(os.Args[0]))
+		for _, o := range conv.order {
+			switch v := o.(type) {
+			case orderSection:
+				utils.Printf("\n%s:\n", o.Value())
+			case orderName:
+				utils.Println(conv.Usage(v.isString, cmd.Lookup(v.Value())))
+			}
+		}
+		if cmdOutput.Len() > 0 {
+			utils.Printf("\nError: %s", cmdOutput.String())
+		}
+	}
+
+	return conv
+}
+
+// LoadConfig Load default options (config + default)
+func (c *Converter) LoadConfig() error {
+	return c.Options.LoadConfig()
+}
+
+// AddSection Create a new section of config
+func (c *Converter) AddSection(section string) {
+	c.order = append(c.order, orderSection{value: section})
+}
+
+// AddStringParam Add a string parameter
+func (c *Converter) AddStringParam(p *string, name string, value string, usage string) {
+	c.Cmd.StringVar(p, name, value, usage)
+	c.order = append(c.order, orderName{value: name, isString: true})
+}
+
+// AddIntParam Add an integer parameter
+func (c *Converter) AddIntParam(p *int, name string, value int, usage string) {
+	c.Cmd.IntVar(p, name, value, usage)
+	c.order = append(c.order, orderName{value: name})
+}
+
+// AddFloatParam Add an float parameter
+func (c *Converter) AddFloatParam(p *float64, name string, value float64, usage string) {
+	c.Cmd.Float64Var(p, name, value, usage)
+	c.order = append(c.order, orderName{value: name})
+}
+
+// AddBoolParam Add a boolean parameter
+func (c *Converter) AddBoolParam(p *bool, name string, value bool, usage string) {
+	c.Cmd.BoolVar(p, name, value, usage)
+	c.order = append(c.order, orderName{value: name})
+}
+
+// InitParse Initialize the parser with all section and parameter.
+func (c *Converter) InitParse() {
+	c.AddSection("Output")
+	c.AddStringParam(&c.Options.Input, "input", "", "Source of comic to convert: directory, cbz, zip, cbr, rar, pdf")
+	c.AddStringParam(&c.Options.Output, "output", "", "Output of the EPUB (directory or EPUB): (default [INPUT].epub)")
+	c.AddStringParam(&c.Options.Author, "author", "GO Comic Converter", "Author of the EPUB")
+	c.AddStringParam(&c.Options.Title, "title", "", "Title of the EPUB")
+
+	c.AddSection("Config")
+	c.AddStringParam(&c.Options.Profile, "profile", c.Options.Profile, "Profile to use: \n"+c.Options.AvailableProfiles())
+	c.AddIntParam(&c.Options.Image.Quality, "quality", c.Options.Image.Quality, "Quality of the image")
+	c.AddBoolParam(&c.Options.Image.GrayScale, "grayscale", c.Options.Image.GrayScale, "Grayscale image. Ideal for eInk devices.")
+	c.AddIntParam(&c.Options.Image.GrayScaleMode, "grayscale-mode", c.Options.Image.GrayScaleMode, "Grayscale Mode\n0 = normal\n1 = average\n2 = luminance")
+	c.AddBoolParam(&c.Options.Image.Crop.Enabled, "crop", c.Options.Image.Crop.Enabled, "Crop images")
+	c.AddIntParam(&c.Options.Image.Crop.Left, "crop-ratio-left", c.Options.Image.Crop.Left, "Crop ratio left: ratio of pixels allow to be non blank while cutting on the left.")
+	c.AddIntParam(&c.Options.Image.Crop.Up, "crop-ratio-up", c.Options.Image.Crop.Up, "Crop ratio up: ratio of pixels allow to be non blank while cutting on the top.")
+	c.AddIntParam(&c.Options.Image.Crop.Right, "crop-ratio-right", c.Options.Image.Crop.Right, "Crop ratio right: ratio of pixels allow to be non blank while cutting on the right.")
+	c.AddIntParam(&c.Options.Image.Crop.Bottom, "crop-ratio-bottom", c.Options.Image.Crop.Bottom, "Crop ratio bottom: ratio of pixels allow to be non blank while cutting on the bottom.")
+	c.AddIntParam(&c.Options.Image.Crop.Limit, "crop-limit", c.Options.Image.Crop.Limit, "Crop limit: maximum number of cropping in percentage allowed. 0 mean unlimited.")
+	c.AddBoolParam(&c.Options.Image.Crop.SkipIfLimitReached, "crop-skip-if-limit-reached", c.Options.Image.Crop.SkipIfLimitReached, "Crop skip if limit reached.")
+	c.AddIntParam(&c.Options.Image.Brightness, "brightness", c.Options.Image.Brightness, "Brightness readjustment: between -100 and 100, > 0 lighter, < 0 darker")
+	c.AddIntParam(&c.Options.Image.Contrast, "contrast", c.Options.Image.Contrast, "Contrast readjustment: between -100 and 100, > 0 more contrast, < 0 less contrast")
+	c.AddBoolParam(&c.Options.Image.AutoContrast, "autocontrast", c.Options.Image.AutoContrast, "Improve contrast automatically")
+	c.AddBoolParam(&c.Options.Image.AutoRotate, "autorotate", c.Options.Image.AutoRotate, "Auto Rotate page when width > height")
+	c.AddBoolParam(&c.Options.Image.AutoSplitDoublePage, "autosplitdoublepage", c.Options.Image.AutoSplitDoublePage, "Auto Split double page when width > height")
+	c.AddBoolParam(&c.Options.Image.KeepDoublePageIfSplit, "keepdoublepageifsplit", c.Options.Image.KeepDoublePageIfSplit, "Keep the double page if split")
+	c.AddBoolParam(&c.Options.Image.KeepSplitDoublePageAspect, "keepsplitdoublepageaspect", c.Options.Image.KeepSplitDoublePageAspect, "Keep aspect of split part of a double page (best for landscape rendering)")
+	c.AddBoolParam(&c.Options.Image.NoBlankImage, "noblankimage", c.Options.Image.NoBlankImage, "Remove blank image")
+	c.AddBoolParam(&c.Options.Image.Manga, "manga", c.Options.Image.Manga, "Manga mode (right to left)")
+	c.AddBoolParam(&c.Options.Image.HasCover, "hascover", c.Options.Image.HasCover, "Has cover. Indicate if your comic have a cover. The first page will be used as a cover and include after the title.")
+	c.AddIntParam(&c.Options.LimitMb, "limitmb", c.Options.LimitMb, "Limit size of the EPUB: Default nolimit (0), Minimum 20")
+	c.AddBoolParam(&c.Options.StripFirstDirectoryFromToc, "strip", c.Options.StripFirstDirectoryFromToc, "Strip first directory from the TOC if only 1")
+	c.AddIntParam(&c.Options.SortPathMode, "sort", c.Options.SortPathMode, "Sort path mode\n0 = alpha for path and file\n1 = alphanumeric for path and alpha for file\n2 = alphanumeric for path and file")
+	c.AddStringParam(&c.Options.Image.View.Color.Foreground, "foreground-color", c.Options.Image.View.Color.Foreground, "Foreground color in hexadecimal format RGB. Black=000, White=FFF")
+	c.AddStringParam(&c.Options.Image.View.Color.Background, "background-color", c.Options.Image.View.Color.Background, "Background color in hexadecimal format RGB. Black=000, White=FFF, Light Gray=DDD, Dark Gray=777")
+	c.AddBoolParam(&c.Options.Image.Resize, "resize", c.Options.Image.Resize, "Reduce image size if exceed device size")
+	c.AddStringParam(&c.Options.Image.Format, "format", c.Options.Image.Format, "Format of output images: jpeg (lossy), png (lossless), copy (no processing)")
+	c.AddFloatParam(&c.Options.Image.View.AspectRatio, "aspect-ratio", c.Options.Image.View.AspectRatio, "Aspect ratio (height/width) of the output\n -1 = same as device\n  0 = same as source\n1.6 = amazon advice for kindle")
+	c.AddBoolParam(&c.Options.Image.View.PortraitOnly, "portrait-only", c.Options.Image.View.PortraitOnly, "Portrait only: force orientation to portrait only.")
+	c.AddIntParam(&c.Options.TitlePage, "titlepage", c.Options.TitlePage, "Title page\n0 = never\n1 = always\n2 = only if epub is split")
+
+	c.AddSection("Default config")
+	c.AddBoolParam(&c.Options.Show, "show", false, "Show your default parameters")
+	c.AddBoolParam(&c.Options.Save, "save", false, "Save your parameters as default")
+	c.AddBoolParam(&c.Options.Reset, "reset", false, "Reset your parameters to default")
+
+	c.AddSection("Shortcut")
+	c.AddBoolParam(&c.Options.Auto, "auto", false, "Activate all automatic options")
+	c.AddBoolParam(&c.Options.NoFilter, "nofilter", false, "Deactivate all filters")
+	c.AddBoolParam(&c.Options.MaxQuality, "maxquality", false, "Max quality: color png + noresize")
+	c.AddBoolParam(&c.Options.BestQuality, "bestquality", false, "Max quality: color jpg q100 + noresize")
+	c.AddBoolParam(&c.Options.GreatQuality, "greatquality", false, "Max quality: grayscale jpg q90 + noresize")
+	c.AddBoolParam(&c.Options.GoodQuality, "goodquality", false, "Max quality: grayscale jpg q90")
+
+	c.AddSection("Compatibility")
+	c.AddBoolParam(&c.Options.Image.AppleBookCompatibility, "applebookcompatibility", c.Options.Image.AppleBookCompatibility, "Apple book compatibility")
+
+	c.AddSection("Other")
+	c.AddIntParam(&c.Options.Workers, "workers", runtime.NumCPU(), "Number of workers")
+	c.AddBoolParam(&c.Options.Dry, "dry", false, "Dry run to show all options")
+	c.AddBoolParam(&c.Options.DryVerbose, "dry-verbose", false, "Display also sorted files after the TOC")
+	c.AddBoolParam(&c.Options.Quiet, "quiet", false, "Disable progress bar")
+	c.AddBoolParam(&c.Options.Json, "json", false, "Output progression and information in Json format")
+	c.AddBoolParam(&c.Options.Version, "version", false, "Show current and available version")
+	c.AddBoolParam(&c.Options.Help, "help", false, "Show this help message")
+}
+
+// Usage Customize version of FlagSet.PrintDefaults
+func (c *Converter) Usage(isString bool, f *flag.Flag) string {
+	var b strings.Builder
+	b.WriteString("  -" + f.Name)
+	name, usage := flag.UnquoteUsage(f)
+	if len(name) > 0 {
+		b.WriteString(" ")
+		b.WriteString(name)
+	}
+	// Print the default value only if it differs to the zero value
+	// for this flag type.
+	if isZero, err := c.isZeroValue(f, f.DefValue); err != nil {
+		c.isZeroValueErrs = append(c.isZeroValueErrs, err)
+	} else if !isZero {
+		if isString {
+			b.WriteString(fmt.Sprintf(" (default %q)", f.DefValue))
+		} else {
+			b.WriteString(fmt.Sprintf(" (default %v)", f.DefValue))
+		}
+	}
+
+	// Boolean flags of one ASCII letter are so common we
+	// treat them specially, putting their usage on the same line.
+	if b.Len() <= 4 { // space, space, '-', 'x'.
+		b.WriteString("\t")
+	} else {
+		// Four spaces before the tab triggers good alignment
+		// for both 4- and 8-space tab stops.
+		b.WriteString("\n    \t")
+	}
+	b.WriteString(strings.ReplaceAll(usage, "\n", "\n    \t"))
+
+	return b.String()
+}
+
+// Taken from flag package as it is private and needed for usage.
+//
+// isZeroValue determines whether the string represents the zero
+// value for a flag.
+func (c *Converter) isZeroValue(f *flag.Flag, value string) (ok bool, err error) {
+	// Build a zero value of the flag's Value type, and see if the
+	// result of calling its String method equals the value passed in.
+	// This works unless the Value type is itself an interface type.
+	typ := reflect.TypeOf(f.Value)
+	var z reflect.Value
+	if typ.Kind() == reflect.Pointer {
+		z = reflect.New(typ.Elem())
+	} else {
+		z = reflect.Zero(typ)
+	}
+	// Catch panics calling the String method, which shouldn't prevent the
+	// usage message from being printed, but that we should report to the
+	// user so that they know to fix their code.
+	defer func() {
+		if e := recover(); e != nil {
+			if typ.Kind() == reflect.Pointer {
+				typ = typ.Elem()
+			}
+			err = fmt.Errorf("panic calling String method on zero %v for flag %s: %v", typ, f.Name, e)
+		}
+	}()
+	return value == z.Interface().(flag.Value).String(), nil
+}
+
+// Parse all parameters
+func (c *Converter) Parse() {
+	if err := c.Cmd.Parse(os.Args[1:]); err != nil {
+		utils.Fatalf("cannot parse command line options: %v", err)
+	}
+	if c.Options.Help {
+		c.Cmd.Usage()
+		os.Exit(0)
+	}
+
+	if c.Options.Auto {
+		c.Options.Image.AutoContrast = true
+		c.Options.Image.AutoRotate = true
+		c.Options.Image.AutoSplitDoublePage = true
+	}
+
+	if c.Options.MaxQuality {
+		c.Options.Image.Format = "png"
+		c.Options.Image.GrayScale = false
+		c.Options.Image.Resize = false
+	} else if c.Options.BestQuality {
+		c.Options.Image.Format = "jpeg"
+		c.Options.Image.Quality = 100
+		c.Options.Image.GrayScale = false
+		c.Options.Image.Resize = false
+	} else if c.Options.GreatQuality {
+		c.Options.Image.Format = "jpeg"
+		c.Options.Image.Quality = 90
+		c.Options.Image.GrayScale = true
+		c.Options.Image.Resize = false
+	} else if c.Options.GoodQuality {
+		c.Options.Image.Format = "jpeg"
+		c.Options.Image.Quality = 90
+		c.Options.Image.GrayScale = true
+		c.Options.Image.Resize = true
+	}
+
+	if c.Options.NoFilter {
+		c.Options.Image.Crop.Enabled = false
+		c.Options.Image.Brightness = 0
+		c.Options.Image.Contrast = 0
+		c.Options.Image.AutoContrast = false
+		c.Options.Image.AutoRotate = false
+		c.Options.Image.NoBlankImage = false
+		c.Options.Image.Resize = false
+	}
+
+	if c.Options.Image.AppleBookCompatibility {
+		c.Options.Image.AutoSplitDoublePage = true
+		c.Options.Image.KeepDoublePageIfSplit = false
+		c.Options.Image.KeepSplitDoublePageAspect = true
+	}
+
+	if c.Options.Image.View.PortraitOnly {
+		c.Options.Image.KeepSplitDoublePageAspect = false
+	}
+}
+
+// Validate Check parameters
+func (c *Converter) Validate() error {
+	// Check input
+	if c.Options.Input == "" {
+		return errors.New("missing input")
+	}
+
+	fi, err := os.Stat(c.Options.Input)
+	if err != nil {
+		return err
+	}
+
+	// Check Output
+	var defaultOutput string
+	inputBase := filepath.Clean(c.Options.Input)
+	if fi.IsDir() {
+		defaultOutput = inputBase + ".epub"
+	} else {
+		ext := filepath.Ext(inputBase)
+		defaultOutput = inputBase[0:len(inputBase)-len(ext)] + ".epub"
+	}
+
+	if c.Options.Output == "" {
+		c.Options.Output = defaultOutput
+	}
+
+	c.Options.Output = filepath.Clean(c.Options.Output)
+	if filepath.Ext(c.Options.Output) == ".epub" {
+		fo, err := os.Stat(filepath.Dir(c.Options.Output))
+		if err != nil {
+			return err
+		}
+		if !fo.IsDir() {
+			return errors.New("parent of the output is not a directory")
+		}
+	} else {
+		fo, err := os.Stat(c.Options.Output)
+		if err != nil {
+			return err
+		}
+		if !fo.IsDir() {
+			return errors.New("output must be an existing dir or end with .epub")
+		}
+		c.Options.Output = filepath.Join(
+			c.Options.Output,
+			filepath.Base(defaultOutput),
+		)
+	}
+
+	// Title
+	if c.Options.Title == "" {
+		ext := filepath.Ext(defaultOutput)
+		c.Options.Title = filepath.Base(defaultOutput[0 : len(defaultOutput)-len(ext)])
+	}
+
+	// Profile
+	if c.Options.Profile == "" {
+		return errors.New("profile missing")
+	}
+
+	if p := c.Options.GetProfile(); p == nil {
+		return fmt.Errorf("profile %q doesn't exists", c.Options.Profile)
+	}
+
+	// LimitMb
+	if c.Options.LimitMb < 20 && c.Options.LimitMb != 0 {
+		return errors.New("limitmb should be 0 or >= 20")
+	}
+
+	// Brightness
+	if c.Options.Image.Brightness < -100 || c.Options.Image.Brightness > 100 {
+		return errors.New("brightness should be between -100 and 100")
+	}
+
+	// Contrast
+	if c.Options.Image.Contrast < -100 || c.Options.Image.Contrast > 100 {
+		return errors.New("contrast should be between -100 and 100")
+	}
+
+	// SortPathMode
+	if c.Options.SortPathMode < 0 || c.Options.SortPathMode > 2 {
+		return errors.New("sort should be 0, 1 or 2")
+	}
+
+	// Color
+	colorRegex := regexp.MustCompile("^[0-9A-F]{3}$")
+	if !colorRegex.MatchString(c.Options.Image.View.Color.Foreground) {
+		return errors.New("foreground color must have color format in hexadecimal: [0-9A-F]{3}")
+	}
+
+	if !colorRegex.MatchString(c.Options.Image.View.Color.Background) {
+		return errors.New("background color must have color format in hexadecimal: [0-9A-F]{3}")
+	}
+
+	// Format
+	if !slices.Contains([]string{"jpeg", "png", "copy"}, c.Options.Image.Format) {
+		return errors.New("format should be jpeg, png or copy")
+	}
+
+	// Aspect Ratio
+	if c.Options.Image.View.AspectRatio < 0 && c.Options.Image.View.AspectRatio != -1 {
+		return errors.New("aspect ratio should be -1, 0 or > 0")
+	}
+
+	// Title Page
+	if c.Options.TitlePage < 0 || c.Options.TitlePage > 2 {
+		return errors.New("title page should be 0, 1 or 2")
+	}
+
+	// Grayscale Mode
+	if c.Options.Image.GrayScaleMode < 0 || c.Options.Image.GrayScaleMode > 2 {
+		return errors.New("grayscale mode should be 0, 1 or 2")
+	}
+
+	// crop
+	if c.Options.Image.Crop.Limit < 0 || c.Options.Image.Crop.Limit > 100 {
+		return errors.New("crop limit should be between 0 and 100")
+	}
+
+	return nil
+}
+
+// Fatal Helper to show usage, err and exit 1
+func (c *Converter) Fatal(err error) {
+	c.Cmd.Usage()
+	utils.Fatalf("\nError: %s\n", err)
+}
+
+func (c *Converter) Stats() {
+	// Display elapse time and memory usage
+	elapse := time.Since(c.startAt).Round(time.Millisecond)
+	var mem runtime.MemStats
+	runtime.ReadMemStats(&mem)
+
+	if c.Options.Json {
+		_ = json.NewEncoder(os.Stdout).Encode(map[string]any{
+			"type": "stats",
+			"data": map[string]any{
+				"elapse_ms":       elapse.Milliseconds(),
+				"memory_usage_mb": mem.Sys / 1024 / 1024,
+			},
+		})
+	} else {
+		utils.Printf(
+			"Completed in %s, Memory usage %d Mb\n",
+			elapse,
+			mem.Sys/1024/1024,
+		)
+	}
+}

internal/pkg/converter/options.go

@@ -0,0 +1,251 @@
+// Package converter options manage options with default value from config.
+package converter
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epuboptions"
+)
+
+type Options struct {
+	epuboptions.EPUBOptions
+
+	// Config
+	Profile string `yaml:"profile" json:"profile"`
+
+	// Default Config
+	Show  bool `yaml:"-" json:"-"`
+	Save  bool `yaml:"-" json:"-"`
+	Reset bool `yaml:"-" json:"-"`
+
+	// Shortcut
+	Auto         bool `yaml:"-" json:"-"`
+	NoFilter     bool `yaml:"-" json:"-"`
+	MaxQuality   bool `yaml:"-" json:"-"`
+	BestQuality  bool `yaml:"-" json:"-"`
+	GreatQuality bool `yaml:"-" json:"-"`
+	GoodQuality  bool `yaml:"-" json:"-"`
+
+	// Other
+	Version bool `yaml:"-" json:"-"`
+	Help    bool `yaml:"-" json:"-"`
+
+	// Internal
+	profiles Profiles
+}
+
+// NewOptions Initialize default options.
+func NewOptions() *Options {
+	return &Options{
+		Profile: "SR",
+		EPUBOptions: epuboptions.EPUBOptions{
+			Image: epuboptions.Image{
+				Quality:   85,
+				GrayScale: true,
+				Crop: epuboptions.Crop{
+					Enabled: true,
+					Left:    1,
+					Up:      1,
+					Right:   1,
+					Bottom:  3,
+				},
+				NoBlankImage:              true,
+				HasCover:                  true,
+				KeepDoublePageIfSplit:     true,
+				KeepSplitDoublePageAspect: true,
+				View: epuboptions.View{
+					Color: epuboptions.Color{
+						Foreground: "000",
+						Background: "FFF",
+					},
+				},
+				Resize: true,
+				Format: "jpeg",
+			},
+			TitlePage:    1,
+			SortPathMode: 1,
+		},
+		profiles: NewProfiles(),
+	}
+}
+
+func (o *Options) Header() string {
+	return "Go Comic Converter\n\nOptions:"
+}
+
+func (o *Options) String() string {
+	var b strings.Builder
+	b.WriteString(o.Header())
+	for _, v := range []struct {
+		K string
+		V any
+	}{
+		{"Input", o.Input},
+		{"Output", o.Output},
+		{"Author", o.Author},
+		{"Title", o.Title},
+		{"Workers", o.Workers},
+	} {
+		b.WriteString(fmt.Sprintf("\n    %-32s: %v", v.K, v.V))
+	}
+	b.WriteString(o.ShowConfig())
+	b.WriteRune('\n')
+	return b.String()
+}
+
+// FileName Config file: ~/.go-comic-converter.yaml
+func (o *Options) FileName() string {
+	home, _ := os.UserHomeDir()
+	return filepath.Join(home, ".go-comic-converter.yaml")
+}
+
+// LoadConfig Load config files
+func (o *Options) LoadConfig() error {
+	f, err := os.Open(o.FileName())
+	if err != nil {
+		return nil
+	}
+	defer func(f *os.File) {
+		_ = f.Close()
+	}(f)
+	err = yaml.NewDecoder(f).Decode(o)
+	if err != nil && err.Error() != "EOF" {
+		return err
+	}
+
+	return nil
+}
+
+// ShowConfig Get current settings for fields that can be saved
+func (o *Options) ShowConfig() string {
+	var profileDesc string
+	profile := o.GetProfile()
+	if profile != nil {
+		profileDesc = profile.String()
+	}
+
+	sortpathmode := ""
+	switch o.SortPathMode {
+	case 0:
+		sortpathmode = "path=alpha, file=alpha"
+	case 1:
+		sortpathmode = "path=alphanumeric, file=alpha"
+	case 2:
+		sortpathmode = "path=alphanumeric, file=alphanumeric"
+	}
+
+	aspectRatio := "auto"
+	if o.Image.View.AspectRatio > 0 {
+		aspectRatio = "1:" + utils.FloatToString(o.Image.View.AspectRatio, 2)
+	} else if o.Image.View.AspectRatio < 0 {
+		if profile != nil {
+			aspectRatio = "1:" + utils.FloatToString(float64(profile.Height)/float64(profile.Width), 2) + " (device)"
+		} else {
+			aspectRatio = "1:?? (device)"
+		}
+	}
+
+	titlePage := ""
+	switch o.TitlePage {
+	case 0:
+		titlePage = "never"
+	case 1:
+		titlePage = "always"
+	case 2:
+		titlePage = "when epub is split"
+	}
+
+	grayscaleMode := "normal"
+	switch o.Image.GrayScaleMode {
+	case 1:
+		grayscaleMode = "average"
+	case 2:
+		grayscaleMode = "luminance"
+	}
+
+	var b strings.Builder
+	for _, v := range []struct {
+		Key       string
+		Value     any
+		Condition bool
+	}{
+		{"Profile", profileDesc, true},
+		{"Format", o.Image.Format, true},
+		{"Quality", o.Image.Quality, o.Image.Format == "jpeg"},
+		{"Grayscale", o.Image.GrayScale, o.Image.Format != "copy"},
+		{"Grayscale mode", grayscaleMode, o.Image.Format != "copy" && o.Image.GrayScale},
+		{"Crop", o.Image.Crop.Enabled, o.Image.Format != "copy"},
+		{"Crop ratio",
+			utils.IntToString(o.Image.Crop.Left) + " Left - " +
+				utils.IntToString(o.Image.Crop.Up) + " Up - " +
+				utils.IntToString(o.Image.Crop.Right) + " Right - " +
+				utils.IntToString(o.Image.Crop.Bottom) + " Bottom - " +
+				"Limit " + utils.IntToString(o.Image.Crop.Limit) + "% - " +
+				"Skip " + utils.BoolToString(o.Image.Crop.SkipIfLimitReached),
+			o.Image.Format != "copy" && o.Image.Crop.Enabled},
+		{"Brightness", o.Image.Brightness, o.Image.Format != "copy" && o.Image.Brightness != 0},
+		{"Contrast", o.Image.Contrast, o.Image.Format != "copy" && o.Image.Contrast != 0},
+		{"Auto contrast", o.Image.AutoContrast, o.Image.Format != "copy"},
+		{"Auto rotate", o.Image.AutoRotate, o.Image.Format != "copy"},
+		{"Auto split double page", o.Image.AutoSplitDoublePage, o.Image.Format != "copy" && (o.Image.View.PortraitOnly || !o.Image.AppleBookCompatibility)},
+		{"Keep double page if split", o.Image.KeepDoublePageIfSplit, o.Image.Format != "copy" && (o.Image.View.PortraitOnly || !o.Image.AppleBookCompatibility) && o.Image.AutoSplitDoublePage},
+		{"Keep split double page aspect", o.Image.KeepSplitDoublePageAspect, o.Image.Format != "copy" && (o.Image.View.PortraitOnly || !o.Image.AppleBookCompatibility) && o.Image.AutoSplitDoublePage},
+		{"No blank image", o.Image.NoBlankImage, o.Image.Format != "copy"},
+		{"Manga", o.Image.Manga, true},
+		{"Has cover", o.Image.HasCover, true},
+		{"Limit", utils.IntToString(o.LimitMb) + " Mb", o.LimitMb != 0},
+		{"Strip first directory from toc", o.StripFirstDirectoryFromToc, true},
+		{"Sort path mode", sortpathmode, true},
+		{"Foreground color", "#" + o.Image.View.Color.Foreground, true},
+		{"Background color", "#" + o.Image.View.Color.Background, true},
+		{"Resize", o.Image.Resize, o.Image.Format != "copy"},
+		{"Aspect ratio", aspectRatio, true},
+		{"Portrait only", o.Image.View.PortraitOnly, true},
+		{"Title page", titlePage, true},
+		{"Apple book compatibility", o.Image.AppleBookCompatibility, !o.Image.View.PortraitOnly},
+	} {
+		if v.Condition {
+			b.WriteString(fmt.Sprintf("\n    %-32s: %v", v.Key, v.Value))
+		}
+	}
+	return b.String()
+}
+
+// ResetConfig reset all settings to default value
+func (o *Options) ResetConfig() error {
+	if err := NewOptions().SaveConfig(); err != nil {
+		return err
+	}
+	return o.LoadConfig()
+}
+
+// SaveConfig save all current settings as default value
+func (o *Options) SaveConfig() error {
+	f, err := os.Create(o.FileName())
+	if err != nil {
+		return err
+	}
+	defer func(f *os.File) {
+		_ = f.Close()
+	}(f)
+	return yaml.NewEncoder(f).Encode(o)
+}
+
+// GetProfile shortcut to get current profile
+func (o *Options) GetProfile() *Profile {
+	if p, ok := o.profiles[o.Profile]; ok {
+		return &p
+	}
+	return nil
+}
+
+// AvailableProfiles all available profiles
+func (o *Options) AvailableProfiles() string {
+	return o.profiles.String()
+}

internal/pkg/converter/order.go

@@ -1,27 +1,27 @@
 package converter
 
 // Name or Section
-type converterOrder interface {
+type order interface {
 	Value() string
 }
 
 // Section
-type converterOrderSection struct {
+type orderSection struct {
 	value string
 }
 
-func (s converterOrderSection) Value() string {
+func (s orderSection) Value() string {
 	return s.value
 }
 
 // Name
 //
 // isString is used to quote the default value.
-type converterOrderName struct {
+type orderName struct {
 	value    string
 	isString bool
 }
 
-func (s converterOrderName) Value() string {
+func (s orderName) Value() string {
 	return s.value
 }

internal/pkg/converter/profiles.go

@@ -1,25 +1,34 @@
-/*
+// Package converter profiles manage supported profiles for go-comic-converter.
-Manage supported profiles for go-comic-converter.
+package converter
-*/
-package profiles
 
 import (
 	"fmt"
 	"strings"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
 )
 
 type Profile struct {
-	Code        string
+	Code        string `json:"code"`
-	Description string
+	Description string `json:"description"`
-	Width       int
+	Width       int    `json:"width"`
-	Height      int
+	Height      int    `json:"height"`
 }
 
-type Profiles []Profile
+func (p Profile) String() string {
+	return p.Code + " - " + p.Description + " - " + utils.IntToString(p.Width) + "x" + utils.IntToString(p.Height)
+}
 
-// Initialize list of all supported profiles.
+type Profiles map[string]Profile
-func New() Profiles {
+
-	return []Profile{
+// NewProfiles Initialize list of all supported profiles.
+func NewProfiles() Profiles {
+	res := make(Profiles)
+	for _, r := range []Profile{
+		// High Resolution for Tablet
+		{"HR", "High Resolution", 2400, 3840},
+		{"SR", "Standard Resolution", 1200, 1920},
+		//Kindle
 		{"K1", "Kindle 1", 600, 670},
 		{"K11", "Kindle 11", 1072, 1448},
 		{"K2", "Kindle 2", 600, 670},
@@ -45,30 +54,24 @@ func New() Profiles {
 		{"KoF", "Kobo Forma", 1440, 1920},
 		{"KoS", "Kobo Sage", 1440, 1920},
 		{"KoE", "Kobo Elipsa", 1404, 1872},
-		// High Resolution for Tablette
+		// reMarkable
-		{"HR", "High Resolution", 2400, 3840},
+		{"RM1", "reMarkable 1", 1404, 1872},
+		{"RM2", "reMarkable 2", 1404, 1872},
+	} {
+		res[r.Code] = r
 	}
+	return res
 }
 
 func (p Profiles) String() string {
 	s := make([]string, 0)
 	for _, v := range p {
 		s = append(s, fmt.Sprintf(
-			"    - %-7s ( %9s ) - %s",
+			"    - %-7s - %4d x %-4d - %s",
 			v.Code,
-			fmt.Sprintf("%dx%d", v.Width, v.Height),
+			v.Width, v.Height,
 			v.Description,
 		))
 	}
 	return strings.Join(s, "\n")
 }
-
-// Lookup profile by code
-func (p Profiles) Get(name string) *Profile {
-	for _, profile := range p {
-		if profile.Code == name {
-			return &profile
-		}
-	}
-	return nil
-}

internal/pkg/epubimage/epub_image.go

@@ -0,0 +1,130 @@
+// Package epubimage EPUBImage helpers to transform image.
+package epubimage
+
+import (
+	"image"
+	"strings"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+)
+
+type EPUBImage struct {
+	Id                  int
+	Part                int
+	Raw                 image.Image
+	Width               int
+	Height              int
+	IsBlank             bool
+	DoublePage          bool
+	Path                string
+	Name                string
+	Position            string
+	Format              string
+	OriginalAspectRatio float64
+	Error               error
+}
+
+// SpaceKey key name of the blank page after the image
+func (i EPUBImage) SpaceKey() string {
+	return "space_" + utils.IntToString(i.Id)
+}
+
+// SpacePath path of the blank page
+func (i EPUBImage) SpacePath() string {
+	return "Text/" + i.SpaceKey() + ".xhtml"
+}
+
+// EPUBSpacePath path of the blank page into the EPUB
+func (i EPUBImage) EPUBSpacePath() string {
+	return "OEBPS/" + i.SpacePath()
+}
+
+func (i EPUBImage) PartKey() string {
+	return utils.IntToString(i.Id) + "_p" + utils.IntToString(i.Part)
+}
+
+// PageKey key for page
+func (i EPUBImage) PageKey() string {
+	return "page_" + i.PartKey()
+}
+
+// PagePath page path linked to the image
+func (i EPUBImage) PagePath() string {
+	return "Text/" + i.PageKey() + ".xhtml"
+}
+
+// EPUBPagePath page path into the EPUB
+func (i EPUBImage) EPUBPagePath() string {
+	return "OEBPS/" + i.PagePath()
+}
+
+// ImgKey key for image
+func (i EPUBImage) ImgKey() string {
+	return "img_" + i.PartKey()
+}
+
+// ImgPath image path
+func (i EPUBImage) ImgPath() string {
+	return "Images/" + i.ImgKey() + "." + i.Format
+}
+
+// EPUBImgPath image path into the EPUB
+func (i EPUBImage) EPUBImgPath() string {
+	return "OEBPS/" + i.ImgPath()
+}
+
+// MediaType of the epub image
+func (i EPUBImage) MediaType() string {
+	return "image/" + i.Format
+}
+
+// ImgStyle style to apply to the image.
+//
+// center by default.
+// align to left or right if it's part of the split double page.
+func (i EPUBImage) ImgStyle(viewWidth, viewHeight int, align string) string {
+	relWidth, relHeight := i.RelSize(viewWidth, viewHeight)
+	marginW, marginH := float64(viewWidth-relWidth)/2, float64(viewHeight-relHeight)/2
+
+	style := make([]string, 0, 4)
+
+	style = append(style, "width:"+utils.IntToString(relWidth)+"px")
+	style = append(style, "height:"+utils.IntToString(relHeight)+"px")
+	style = append(style, "top:"+utils.FloatToString(marginH*100/float64(viewHeight), 2)+"%")
+	if align == "" {
+		switch i.Position {
+		case "rendition:page-spread-left":
+			style = append(style, "right:0")
+		case "rendition:page-spread-right":
+			style = append(style, "left:0")
+		default:
+			style = append(style, "left:"+utils.FloatToString(marginW*100/float64(viewWidth), 2)+"%")
+		}
+	} else {
+		style = append(style, align)
+	}
+
+	return strings.Join(style, "; ")
+}
+
+func (i EPUBImage) RelSize(viewWidth, viewHeight int) (relWidth, relHeight int) {
+	w, h := viewWidth, viewHeight
+	srcw, srch := i.Width, i.Height
+
+	if w <= 0 || h <= 0 || srcw <= 0 || srch <= 0 {
+		return
+	}
+
+	wratio := float64(srcw) / float64(w)
+	hratio := float64(srch) / float64(h)
+
+	if wratio > hratio {
+		relWidth = w
+		relHeight = int(float64(srch)/wratio + 0.5)
+	} else {
+		relHeight = h
+		relWidth = int(float64(srcw)/hratio + 0.5)
+	}
+
+	return
+}

internal/pkg/epubimagefilters/auto_contrast.go

@@ -8,31 +8,31 @@ import (
 	"github.com/disintegration/gift"
 )
 
-// Automatically improve contrast
+// AutoContrast Automatically improve contrast
-func AutoContrast() *autocontrast {
+func AutoContrast() gift.Filter {
-	return &autocontrast{}
+	return autocontrast{}
 }
 
 type autocontrast struct {
 }
 
 // compute the color number between 0 and 1 that hold half of the pixel
-func (f *autocontrast) mean(src image.Image) float32 {
+func (f autocontrast) mean(src image.Image) float32 {
-	bucket := map[uint32]int{}
+	bucket := map[int]int{}
 	for x := src.Bounds().Min.X; x < src.Bounds().Max.X; x++ {
 		for y := src.Bounds().Min.Y; y < src.Bounds().Max.Y; y++ {
 			v, _, _, _ := color.GrayModel.Convert(src.At(x, y)).RGBA()
-			bucket[v]++
+			bucket[int(v)]++
 		}
 	}
 
 	// calculate color idx
-	var colorIdx uint32
+	var colorIdx int
 	{
 		// limit to half of the pixel
 		limit := src.Bounds().Dx() * src.Bounds().Dy() / 2
 		// loop on all color from 0 to 65536
-		for colorIdx = 0; colorIdx < 1<<16; colorIdx++ {
+		for colorIdx := range 1 << 16 {
 			if limit-bucket[colorIdx] < 0 {
 				break
 			}
@@ -44,7 +44,7 @@ func (f *autocontrast) mean(src image.Image) float32 {
 }
 
 // ensure value stay into 0 to 1 bound
-func (f *autocontrast) cap(v float32) float32 {
+func (f autocontrast) cap(v float32) float32 {
 	if v < 0 {
 		return 0
 	}
@@ -55,12 +55,12 @@ func (f *autocontrast) cap(v float32) float32 {
 }
 
 // power of 2 for float32
-func (f *autocontrast) pow2(v float32) float32 {
+func (f autocontrast) pow2(v float32) float32 {
 	return v * v
 }
 
 // Draw into the dst after applying the filter
-func (f *autocontrast) Draw(dst draw.Image, src image.Image, options *gift.Options) {
+func (f autocontrast) Draw(dst draw.Image, src image.Image, options *gift.Options) {
 	// half of the pixel has this color idx
 	colorMean := f.mean(src)
 
@@ -78,13 +78,13 @@ func (f *autocontrast) Draw(dst draw.Image, src image.Image, options *gift.Optio
 		// compute a curve from dark and light factor applying to the color
 		c := (1 - d) + (d+l)*y
 
-		// applying the coef
+		// applying the ratio
 		return f.cap(r0 * c), f.cap(g0 * c), f.cap(b0 * c), a0
 	}).Draw(dst, src, options)
 }
 
 // Bounds calculates the appropriate bounds of an image after applying the filter.
-func (*autocontrast) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
+func (autocontrast) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
 	dstBounds = srcBounds
 	return
 }

internal/pkg/epubimagefilters/auto_crop.go

@@ -7,10 +7,10 @@ import (
 	"github.com/disintegration/gift"
 )
 
-// Lookup for margin and crop
+// AutoCrop Lookup for margin and crop
-func AutoCrop(img image.Image, cutRatioLeft, cutRatioUp, cutRatioRight, cutRatioBottom int) gift.Filter {
+func AutoCrop(img image.Image, bounds image.Rectangle, cutRatioLeft, cutRatioUp, cutRatioRight, cutRatioBottom int, limit int, skipIfLimitReached bool) gift.Filter {
 	return gift.Crop(
-		findMarging(img, cutRatioOptions{cutRatioLeft, cutRatioUp, cutRatioRight, cutRatioBottom}),
+		findMargin(img, bounds, cutRatioOptions{cutRatioLeft, cutRatioUp, cutRatioRight, cutRatioBottom}, limit, skipIfLimitReached),
 	)
 }
 
@@ -25,8 +25,8 @@ type cutRatioOptions struct {
 	Left, Up, Right, Bottom int
 }
 
-func findMarging(img image.Image, cutRatio cutRatioOptions) image.Rectangle {
+func findMargin(img image.Image, bounds image.Rectangle, cutRatio cutRatioOptions, limit int, skipIfLimitReached bool) image.Rectangle {
-	imgArea := img.Bounds()
+	imgArea := bounds
 
 LEFT:
 	for x := imgArea.Min.X; x < imgArea.Max.X; x++ {
@@ -84,5 +84,40 @@ BOTTOM:
 		imgArea.Max.Y--
 	}
 
+	// no limit or blankImage
+	if limit == 0 || imgArea.Dx() == 0 || imgArea.Dy() == 0 {
 		return imgArea
 	}
+
+	exceedX, exceedY := limitExceed(bounds, imgArea, limit)
+	if skipIfLimitReached && (exceedX > 0 || exceedY > 0) {
+		return bounds
+	}
+
+	imgArea.Min.X, imgArea.Max.X = correctLine(imgArea.Min.X, imgArea.Max.X, bounds.Min.X, bounds.Max.X, exceedX)
+	imgArea.Min.Y, imgArea.Max.Y = correctLine(imgArea.Min.Y, imgArea.Max.Y, bounds.Min.Y, bounds.Max.Y, exceedY)
+
+	return imgArea
+}
+
+func limitExceed(bounds, newBounds image.Rectangle, limit int) (int, int) {
+	return bounds.Dx() - newBounds.Dx() - bounds.Dx()*limit/100, bounds.Dy() - newBounds.Dy() - bounds.Dy()*limit/100
+}
+
+func correctLine(min, max, bMin, bMax, exceed int) (int, int) {
+	if exceed <= 0 {
+		return min, max
+	}
+
+	min -= exceed / 2
+	max += exceed / 2
+	if min < bMin {
+		max += bMin - min
+		min = bMin
+	}
+	if max > bMax {
+		min -= max - bMax
+		max = bMax
+	}
+	return min, max
+}

internal/pkg/epubimagefilters/cover_title.go

@@ -11,9 +11,9 @@ import (
 	"golang.org/x/image/font/gofont/gomonobold"
 )
 
-// Create a title with the cover image
+// CoverTitle Create a title with the cover image
 func CoverTitle(title string, align string, pctWidth int, pctMargin int, maxFontSize int, borderSize int) gift.Filter {
-	return &coverTitle{title, align, pctWidth, pctMargin, maxFontSize, borderSize}
+	return coverTitle{title, align, pctWidth, pctMargin, maxFontSize, borderSize}
 }
 
 type coverTitle struct {
@@ -25,13 +25,13 @@ type coverTitle struct {
 	borderSize  int
 }
 
-// size is the same as source
+// Bounds size is the same as source
-func (p *coverTitle) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
+func (p coverTitle) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
 	return srcBounds
 }
 
-// blur the src image, and create a box with the title in the middle
+// Draw blur the src image, and create a box with the title in the middle
-func (p *coverTitle) Draw(dst draw.Image, src image.Image, options *gift.Options) {
+func (p coverTitle) Draw(dst draw.Image, src image.Image, _ *gift.Options) {
 	draw.Draw(dst, dst.Bounds(), src, src.Bounds().Min, draw.Src)
 	if p.title == "" {
 		return
@@ -94,5 +94,5 @@ func (p *coverTitle) Draw(dst draw.Image, src image.Image, options *gift.Options
 		textLeft = textArea.Min.X
 	}
 	textTop := textArea.Min.Y + textArea.Dy()/2 + textHeight/4
-	c.DrawString(p.title, freetype.Pt(textLeft, textTop))
+	_, _ = c.DrawString(p.title, freetype.Pt(textLeft, textTop))
 }

internal/pkg/epubimagefilters/crop_split_double_page.go

@@ -7,17 +7,18 @@ import (
 	"github.com/disintegration/gift"
 )
 
-// Cut a double page in 2 part: left and right.
+// CropSplitDoublePage Cut a double page in 2 part: left and right.
+//
 // This will cut in the middle of the page.
 func CropSplitDoublePage(right bool) gift.Filter {
-	return &cropSplitDoublePage{right}
+	return cropSplitDoublePage{right}
 }
 
 type cropSplitDoublePage struct {
 	right bool
 }
 
-func (p *cropSplitDoublePage) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
+func (p cropSplitDoublePage) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
 	if p.right {
 		dstBounds = image.Rect(
 			srcBounds.Max.X/2, srcBounds.Min.Y,
@@ -32,6 +33,6 @@ func (p *cropSplitDoublePage) Bounds(srcBounds image.Rectangle) (dstBounds image
 	return
 }
 
-func (p *cropSplitDoublePage) Draw(dst draw.Image, src image.Image, options *gift.Options) {
+func (p cropSplitDoublePage) Draw(dst draw.Image, src image.Image, options *gift.Options) {
 	gift.Crop(dst.Bounds()).Draw(dst, src, options)
 }

internal/pkg/epubimagefilters/pixel.go

@@ -8,16 +8,17 @@ import (
 	"github.com/disintegration/gift"
 )
 
-// Generate a blank pixel 1x1, if the size of the image is 0x0.
+// Pixel Generate a blank pixel 1x1, if the size of the image is 0x0.
+//
 // An image 0x0 is not a valid image, and failed to read.
 func Pixel() gift.Filter {
-	return &pixel{}
+	return pixel{}
 }
 
 type pixel struct {
 }
 
-func (p *pixel) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
+func (p pixel) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
 	if srcBounds.Dx() == 0 || srcBounds.Dy() == 0 {
 		dstBounds = image.Rect(0, 0, 1, 1)
 	} else {
@@ -26,7 +27,7 @@ func (p *pixel) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
 	return
 }
 
-func (p *pixel) Draw(dst draw.Image, src image.Image, options *gift.Options) {
+func (p pixel) Draw(dst draw.Image, src image.Image, _ *gift.Options) {
 	if dst.Bounds().Dx() == 1 && dst.Bounds().Dy() == 1 {
 		dst.Set(0, 0, color.White)
 		return

internal/pkg/epubimagepassthrough/passthrough.go

@@ -0,0 +1,432 @@
+package epubimagepassthrough
+
+import (
+	"archive/zip"
+	"bytes"
+	"errors"
+	"fmt"
+	"image"
+	"image/jpeg"
+	"image/png"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"github.com/nwaples/rardecode/v2"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimageprocessor"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubprogress"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubzip"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/sortpath"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epuboptions"
+)
+
+type ePUBImagePassthrough struct {
+	epuboptions.EPUBOptions
+}
+
+func (e ePUBImagePassthrough) Load() (images []epubimage.EPUBImage, err error) {
+	fi, err := os.Stat(e.Input)
+	if err != nil {
+		return
+	}
+
+	if fi.IsDir() {
+		return e.loadDir()
+	} else {
+		switch ext := strings.ToLower(filepath.Ext(e.Input)); ext {
+		case ".cbz", ".zip":
+			return e.loadCbz()
+		case ".cbr", ".rar":
+			return e.loadCbr()
+		default:
+			return nil, fmt.Errorf("unknown file format (%s): support .cbz, .zip, .cbr, .rar", ext)
+		}
+	}
+}
+
+func (e ePUBImagePassthrough) CoverTitleData(o epubimageprocessor.CoverTitleDataOptions) (epubzip.Image, error) {
+	return epubimageprocessor.New(e.EPUBOptions).CoverTitleData(o)
+}
+
+var errNoImagesFound = errors.New("no images found")
+
+func New(o epuboptions.EPUBOptions) epubimageprocessor.EPUBImageProcessor {
+	return ePUBImagePassthrough{o}
+}
+
+func (e ePUBImagePassthrough) loadDir() (images []epubimage.EPUBImage, err error) {
+	imagesPath := make([]string, 0)
+
+	input := filepath.Clean(e.Input)
+	err = filepath.WalkDir(input, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if !d.IsDir() && e.isSupportedImage(path) {
+			imagesPath = append(imagesPath, path)
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		return
+	}
+
+	if len(imagesPath) == 0 {
+		err = errNoImagesFound
+		return
+	}
+
+	sort.Sort(sortpath.By(imagesPath, e.SortPathMode))
+
+	var imgStorage epubzip.StorageImageWriter
+	imgStorage, err = epubzip.NewStorageImageWriter(e.ImgStorage(), e.Image.Format)
+	if err != nil {
+		return
+	}
+	defer imgStorage.Close()
+
+	// processing
+	bar := epubprogress.New(epubprogress.Options{
+		Quiet:       e.Quiet,
+		Json:        e.Json,
+		Max:         len(imagesPath),
+		Description: "Copying",
+		CurrentJob:  1,
+		TotalJob:    2,
+	})
+	defer bar.Close()
+
+	for i, imgPath := range imagesPath {
+
+		var img epubimage.EPUBImage
+		img, err = e.copyRawDataToStorage(
+			imgStorage,
+			func() ([]byte, error) {
+				f, err := os.Open(imgPath)
+				if err != nil {
+					return nil, err
+				}
+				defer f.Close()
+				return io.ReadAll(f)
+			},
+			i,
+			input,
+			imgPath,
+		)
+		if err != nil {
+			return
+		}
+
+		images = append(images, img)
+		_ = bar.Add(1)
+	}
+
+	if len(images) == 0 {
+		err = errNoImagesFound
+	}
+
+	return
+
+}
+
+func (e ePUBImagePassthrough) loadCbz() (images []epubimage.EPUBImage, err error) {
+	images = make([]epubimage.EPUBImage, 0)
+
+	input := filepath.Clean(e.Input)
+	r, err := zip.OpenReader(input)
+	if err != nil {
+		return
+	}
+	defer r.Close()
+
+	imagesZip := make([]*zip.File, 0)
+	for _, f := range r.File {
+		if !f.FileInfo().IsDir() && e.isSupportedImage(f.Name) {
+			imagesZip = append(imagesZip, f)
+		}
+	}
+
+	if len(imagesZip) == 0 {
+		err = errNoImagesFound
+		return
+	}
+
+	var names []string
+	for _, img := range imagesZip {
+		names = append(names, img.Name)
+	}
+
+	sort.Sort(sortpath.By(names, e.SortPathMode))
+
+	indexedNames := make(map[string]int)
+	for i, name := range names {
+		indexedNames[name] = i
+	}
+
+	var imgStorage epubzip.StorageImageWriter
+	imgStorage, err = epubzip.NewStorageImageWriter(e.ImgStorage(), e.Image.Format)
+	if err != nil {
+		return
+	}
+	defer imgStorage.Close()
+
+	// processing
+	bar := epubprogress.New(epubprogress.Options{
+		Quiet:       e.Quiet,
+		Json:        e.Json,
+		Max:         len(imagesZip),
+		Description: "Copying",
+		CurrentJob:  1,
+		TotalJob:    2,
+	})
+	defer bar.Close()
+
+	for _, imgZip := range imagesZip {
+		if _, ok := indexedNames[imgZip.Name]; !ok {
+			continue
+		}
+
+		var img epubimage.EPUBImage
+		img, err = e.copyRawDataToStorage(
+			imgStorage,
+			func() ([]byte, error) {
+				f, err := imgZip.Open()
+				if err != nil {
+					return nil, err
+				}
+				defer f.Close()
+
+				return io.ReadAll(f)
+			},
+			indexedNames[imgZip.Name],
+			"",
+			imgZip.Name,
+		)
+
+		if err != nil {
+			return
+		}
+
+		images = append(images, img)
+		_ = bar.Add(1)
+	}
+
+	if len(images) == 0 {
+		err = errNoImagesFound
+	}
+
+	return
+}
+
+func (e ePUBImagePassthrough) loadCbr() (images []epubimage.EPUBImage, err error) {
+	images = make([]epubimage.EPUBImage, 0)
+
+	var isSolid bool
+	files, err := rardecode.List(e.Input)
+	if err != nil {
+		return
+	}
+
+	names := make([]string, 0)
+	for _, f := range files {
+		if !f.IsDir && e.isSupportedImage(f.Name) {
+			if f.Solid {
+				isSolid = true
+			}
+			names = append(names, f.Name)
+		}
+	}
+
+	if len(names) == 0 {
+		err = errNoImagesFound
+		return
+	}
+
+	sort.Sort(sortpath.By(names, e.SortPathMode))
+
+	indexedNames := make(map[string]int)
+	for i, name := range names {
+		indexedNames[name] = i
+	}
+
+	var imgStorage epubzip.StorageImageWriter
+	imgStorage, err = epubzip.NewStorageImageWriter(e.ImgStorage(), e.Image.Format)
+	if err != nil {
+		return
+	}
+	defer imgStorage.Close()
+
+	// processing
+	bar := epubprogress.New(epubprogress.Options{
+		Quiet:       e.Quiet,
+		Json:        e.Json,
+		Max:         len(names),
+		Description: "Copying",
+		CurrentJob:  1,
+		TotalJob:    2,
+	})
+	defer bar.Close()
+
+	if isSolid {
+		var r *rardecode.ReadCloser
+		r, err = rardecode.OpenReader(e.Input)
+		if err != nil {
+			return
+		}
+		defer r.Close()
+
+		for {
+			f, rerr := r.Next()
+			if rerr != nil {
+				if rerr == io.EOF {
+					break
+				}
+				err = rerr
+				return
+			}
+
+			if _, ok := indexedNames[f.Name]; !ok {
+				continue
+			}
+
+			var img epubimage.EPUBImage
+			img, err = e.copyRawDataToStorage(
+				imgStorage,
+				func() ([]byte, error) {
+					return io.ReadAll(r)
+				},
+				indexedNames[f.Name],
+				"",
+				f.Name,
+			)
+
+			if err != nil {
+				return
+			}
+
+			images = append(images, img)
+			_ = bar.Add(1)
+		}
+	} else {
+		for _, file := range files {
+			if i, ok := indexedNames[file.Name]; ok {
+				var img epubimage.EPUBImage
+				img, err = e.copyRawDataToStorage(
+					imgStorage,
+					func() ([]byte, error) {
+						f, err := file.Open()
+						if err != nil {
+							return nil, err
+						}
+						defer f.Close()
+						return io.ReadAll(f)
+					},
+					i,
+					"",
+					file.Name,
+				)
+
+				if err != nil {
+					return
+				}
+
+				images = append(images, img)
+				_ = bar.Add(1)
+			}
+		}
+	}
+
+	if len(images) == 0 {
+		err = errNoImagesFound
+	}
+
+	return
+}
+
+func (e ePUBImagePassthrough) isSupportedImage(path string) bool {
+	switch strings.ToLower(filepath.Ext(path)) {
+	case ".jpg", ".jpeg", ".png":
+		{
+			return !strings.HasPrefix(filepath.Base(path), ".")
+		}
+	}
+	return false
+}
+
+func (e ePUBImagePassthrough) copyRawDataToStorage(
+	imgStorage epubzip.StorageImageWriter,
+	getData func() ([]byte, error),
+	id int,
+	dirname string,
+	filename string,
+) (img epubimage.EPUBImage, err error) {
+	var uncompressedData []byte
+	uncompressedData, err = getData()
+	if err != nil {
+		return
+	}
+
+	p, fn := filepath.Split(filepath.Clean(filename))
+	if p == dirname {
+		p = ""
+	} else {
+		p = p[len(dirname)+1:]
+	}
+
+	var (
+		format       string
+		decodeConfig func(r io.Reader) (image.Config, error)
+		decode       func(r io.Reader) (image.Image, error)
+	)
+
+	switch filepath.Ext(fn) {
+	case ".png":
+		format = "png"
+		decodeConfig = png.DecodeConfig
+		decode = png.Decode
+	case ".jpg", ".jpeg":
+		format = "jpeg"
+		decodeConfig = jpeg.DecodeConfig
+		decode = jpeg.Decode
+	}
+
+	var config image.Config
+	config, err = decodeConfig(bytes.NewReader(uncompressedData))
+	if err != nil {
+		return
+	}
+
+	var rawImage image.Image
+	if id == 0 {
+		rawImage, err = decode(bytes.NewReader(uncompressedData))
+		if err != nil {
+			return
+		}
+	}
+
+	img = epubimage.EPUBImage{
+		Id:                  id,
+		Part:                0,
+		Raw:                 rawImage,
+		Width:               config.Width,
+		Height:              config.Height,
+		IsBlank:             false,
+		DoublePage:          config.Width > config.Height,
+		Path:                p,
+		Name:                fn,
+		Format:              format,
+		OriginalAspectRatio: float64(config.Height) / float64(config.Width),
+	}
+
+	err = imgStorage.AddRaw(img.EPUBImgPath(), uncompressedData)
+
+	return
+}

internal/pkg/epubimageprocessor/loader.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"image"
+	"image/color"
 	_ "image/jpeg"
 	_ "image/png"
 	"io"
@@ -16,36 +17,44 @@ import (
 	"strings"
 	"sync"
 
+	"golang.org/x/image/font/gofont/gomonobold"
+	_ "golang.org/x/image/tiff"
 	_ "golang.org/x/image/webp"
 
-	"github.com/celogeek/go-comic-converter/v2/internal/sortpath"
+	"github.com/fogleman/gg"
+	"github.com/golang/freetype/truetype"
 	"github.com/nwaples/rardecode/v2"
 	pdfimage "github.com/raff/pdfreader/image"
 	"github.com/raff/pdfreader/pdfread"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/sortpath"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
 )
 
-type tasks struct {
+type task struct {
 	Id    int
 	Image image.Image
 	Path  string
 	Name  string
+	Error error
 }
 
 var errNoImagesFound = errors.New("no images found")
 
 // only accept jpg, png and webp as source file
-func (e *EPUBImageProcessor) isSupportedImage(path string) bool {
+func (e ePUBImageProcessor) isSupportedImage(path string) bool {
 	switch strings.ToLower(filepath.Ext(path)) {
-	case ".jpg", ".jpeg", ".png", ".webp":
+	case ".jpg", ".jpeg", ".png", ".webp", ".tiff":
 		{
-			return true
+			return !strings.HasPrefix(filepath.Base(path), ".")
 		}
 	}
 	return false
 }
 
-// Load images from input
+// load images from input
-func (e *EPUBImageProcessor) load() (totalImages int, output chan *tasks, err error) {
+func (e ePUBImageProcessor) load() (totalImages int, output chan task, err error) {
 	fi, err := os.Stat(e.Input)
 	if err != nil {
 		return
@@ -69,8 +78,31 @@ func (e *EPUBImageProcessor) load() (totalImages int, output chan *tasks, err er
 	}
 }
 
+func (e ePUBImageProcessor) corruptedImage(path, name string) image.Image {
+	var w, h float64 = 1200, 1920
+	f, _ := truetype.Parse(gomonobold.TTF)
+	face := truetype.NewFace(f, &truetype.Options{Size: 64, DPI: 72})
+	txt := name
+	if path != "" {
+		txt += "\nin " + filepath.Clean(path)
+	}
+	txt += "\nis corrupted!"
+
+	g := gg.NewContext(int(w), int(h))
+	g.SetColor(color.White)
+	g.Clear()
+	g.SetColor(color.Black)
+	g.DrawRoundedRectangle(0, 0, w, h, 0.5)
+	g.SetLineWidth(6)
+	g.Stroke()
+	g.DrawRoundedRectangle(0, 0, 480, 640, 0.5)
+	g.SetFontFace(face)
+	g.DrawStringWrapped(txt, w/2, h/2, 0.5, 0.5, 640, 1.5, gg.AlignCenter)
+	return g.Image()
+}
+
 // load a directory of images
-func (e *EPUBImageProcessor) loadDir() (totalImages int, output chan *tasks, err error) {
+func (e ePUBImageProcessor) loadDir() (totalImages int, output chan task, err error) {
 	images := make([]string, 0)
 
 	input := filepath.Clean(e.Input)
@@ -102,35 +134,31 @@ func (e *EPUBImageProcessor) loadDir() (totalImages int, output chan *tasks, err
 		Id   int
 		Path string
 	}
-	jobs := make(chan *job)
+	jobs := make(chan job)
 	go func() {
 		defer close(jobs)
 		for i, path := range images {
-			jobs <- &job{i, path}
+			jobs <- job{i, path}
 		}
 	}()
 
 	// read in parallel and get an image
-	output = make(chan *tasks, e.Workers)
+	output = make(chan task, e.Workers)
 	wg := &sync.WaitGroup{}
-	for j := 0; j < e.WorkersRatio(50); j++ {
+	for range e.WorkersRatio(50) {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
 			for job := range jobs {
 				var img image.Image
+				var err error
 				if !e.Dry {
-					f, err := os.Open(job.Path)
+					var f *os.File
-					if err != nil {
+					f, err = os.Open(job.Path)
-						fmt.Fprintf(os.Stderr, "\nerror processing image %s: %s\n", job.Path, err)
+					if err == nil {
-						os.Exit(1)
-					}
 						img, _, err = image.Decode(f)
-					if err != nil {
+						_ = f.Close()
-						fmt.Fprintf(os.Stderr, "\nerror processing image %s: %s\n", job.Path, err)
-						os.Exit(1)
 					}
-					f.Close()
 				}
 
 				p, fn := filepath.Split(job.Path)
@@ -139,11 +167,15 @@ func (e *EPUBImageProcessor) loadDir() (totalImages int, output chan *tasks, err
 				} else {
 					p = p[len(input)+1:]
 				}
-				output <- &tasks{
+				if err != nil {
+					img = e.corruptedImage(p, fn)
+				}
+				output <- task{
 					Id:    job.Id,
 					Image: img,
 					Path:  p,
 					Name:  fn,
+					Error: err,
 				}
 			}
 		}()
@@ -159,7 +191,7 @@ func (e *EPUBImageProcessor) loadDir() (totalImages int, output chan *tasks, err
 }
 
 // load a zip file that include images
-func (e *EPUBImageProcessor) loadCbz() (totalImages int, output chan *tasks, err error) {
+func (e ePUBImageProcessor) loadCbz() (totalImages int, output chan task, err error) {
 	r, err := zip.OpenReader(e.Input)
 	if err != nil {
 		return
@@ -175,12 +207,12 @@ func (e *EPUBImageProcessor) loadCbz() (totalImages int, output chan *tasks, err
 	totalImages = len(images)
 
 	if totalImages == 0 {
-		r.Close()
+		_ = r.Close()
 		err = errNoImagesFound
 		return
 	}
 
-	names := []string{}
+	var names []string
 	for _, img := range images {
 		names = append(names, img.Name)
 	}
@@ -195,42 +227,42 @@ func (e *EPUBImageProcessor) loadCbz() (totalImages int, output chan *tasks, err
 		Id int
 		F  *zip.File
 	}
-	jobs := make(chan *job)
+	jobs := make(chan job)
 	go func() {
 		defer close(jobs)
 		for _, img := range images {
-			jobs <- &job{indexedNames[img.Name], img}
+			jobs <- job{indexedNames[img.Name], img}
 		}
 	}()
 
-	output = make(chan *tasks, e.Workers)
+	output = make(chan task, e.Workers)
 	wg := &sync.WaitGroup{}
-	for j := 0; j < e.WorkersRatio(50); j++ {
+	for range e.WorkersRatio(50) {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
 			for job := range jobs {
 				var img image.Image
+				var err error
 				if !e.Dry {
-					f, err := job.F.Open()
+					var f io.ReadCloser
-					if err != nil {
+					f, err = job.F.Open()
-						fmt.Fprintf(os.Stderr, "\nerror processing image %s: %s\n", job.F.Name, err)
+					if err == nil {
-						os.Exit(1)
-					}
 						img, _, err = image.Decode(f)
-					if err != nil {
-						fmt.Fprintf(os.Stderr, "\nerror processing image %s: %s\n", job.F.Name, err)
-						os.Exit(1)
 					}
-					f.Close()
+					_ = f.Close()
 				}
 
 				p, fn := filepath.Split(filepath.Clean(job.F.Name))
-				output <- &tasks{
+				if err != nil {
+					img = e.corruptedImage(p, fn)
+				}
+				output <- task{
 					Id:    job.Id,
 					Image: img,
 					Path:  p,
 					Name:  fn,
+					Error: err,
 				}
 			}
 		}()
@@ -239,13 +271,13 @@ func (e *EPUBImageProcessor) loadCbz() (totalImages int, output chan *tasks, err
 	go func() {
 		wg.Wait()
 		close(output)
-		r.Close()
+		_ = r.Close()
 	}()
 	return
 }
 
 // load a rar file that include images
-func (e *EPUBImageProcessor) loadCbr() (totalImages int, output chan *tasks, err error) {
+func (e ePUBImageProcessor) loadCbr() (totalImages int, output chan task, err error) {
 	var isSolid bool
 	files, err := rardecode.List(e.Input)
 	if err != nil {
@@ -281,33 +313,32 @@ func (e *EPUBImageProcessor) loadCbr() (totalImages int, output chan *tasks, err
 		Open func() (io.ReadCloser, error)
 	}
 
-	jobs := make(chan *job)
+	jobs := make(chan job)
 	go func() {
 		defer close(jobs)
 		if isSolid && !e.Dry {
 			r, rerr := rardecode.OpenReader(e.Input)
 			if rerr != nil {
-				fmt.Fprintf(os.Stderr, "\nerror processing image %s: %s\n", e.Input, rerr)
+				utils.Fatalf("\nerror processing image %s: %s\n", e.Input, rerr)
-				os.Exit(1)
 			}
-			defer r.Close()
+			defer func(r *rardecode.ReadCloser) {
+				_ = r.Close()
+			}(r)
 			for {
 				f, rerr := r.Next()
 				if rerr != nil {
 					if rerr == io.EOF {
 						break
 					}
-					fmt.Fprintf(os.Stderr, "\nerror processing image %s: %s\n", f.Name, rerr)
+					utils.Fatalf("\nerror processing image %s: %s\n", f.Name, rerr)
-					os.Exit(1)
 				}
 				if i, ok := indexedNames[f.Name]; ok {
 					var b bytes.Buffer
 					_, rerr = io.Copy(&b, r)
 					if rerr != nil {
-						fmt.Fprintf(os.Stderr, "\nerror processing image %s: %s\n", f.Name, rerr)
+						utils.Fatalf("\nerror processing image %s: %s\n", f.Name, rerr)
-						os.Exit(1)
 					}
-					jobs <- &job{i, f.Name, func() (io.ReadCloser, error) {
+					jobs <- job{i, f.Name, func() (io.ReadCloser, error) {
 						return io.NopCloser(bytes.NewReader(b.Bytes())), nil
 					}}
 				}
@@ -315,41 +346,41 @@ func (e *EPUBImageProcessor) loadCbr() (totalImages int, output chan *tasks, err
 		} else {
 			for _, img := range files {
 				if i, ok := indexedNames[img.Name]; ok {
-					jobs <- &job{i, img.Name, img.Open}
+					jobs <- job{i, img.Name, img.Open}
 				}
 			}
 		}
 	}()
 
 	// send file to the queue
-	output = make(chan *tasks, e.Workers)
+	output = make(chan task, e.Workers)
 	wg := &sync.WaitGroup{}
-	for j := 0; j < e.WorkersRatio(50); j++ {
+	for range e.WorkersRatio(50) {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
 			for job := range jobs {
 				var img image.Image
+				var err error
 				if !e.Dry {
-					f, err := job.Open()
+					var f io.ReadCloser
-					if err != nil {
+					f, err = job.Open()
-						fmt.Fprintf(os.Stderr, "\nerror processing image %s: %s\n", job.Name, err)
+					if err == nil {
-						os.Exit(1)
-					}
 						img, _, err = image.Decode(f)
-					if err != nil {
-						fmt.Fprintf(os.Stderr, "\nerror processing image %s: %s\n", job.Name, err)
-						os.Exit(1)
 					}
-					f.Close()
+					_ = f.Close()
 				}
 
 				p, fn := filepath.Split(filepath.Clean(job.Name))
-				output <- &tasks{
+				if err != nil {
+					img = e.corruptedImage(p, fn)
+				}
+				output <- task{
 					Id:    job.Id,
 					Image: img,
 					Path:  p,
 					Name:  fn,
+					Error: err,
 				}
 			}
 		}()
@@ -362,7 +393,7 @@ func (e *EPUBImageProcessor) loadCbr() (totalImages int, output chan *tasks, err
 }
 
 // extract image from a pdf
-func (e *EPUBImageProcessor) loadPdf() (totalImages int, output chan *tasks, err error) {
+func (e ePUBImageProcessor) loadPdf() (totalImages int, output chan task, err error) {
 	pdf := pdfread.Load(e.Input)
 	if pdf == nil {
 		err = fmt.Errorf("can't read pdf")
@@ -370,26 +401,28 @@ func (e *EPUBImageProcessor) loadPdf() (totalImages int, output chan *tasks, err
 	}
 
 	totalImages = len(pdf.Pages())
-	pageFmt := fmt.Sprintf("page %%0%dd", len(fmt.Sprintf("%d", totalImages)))
+	pageFmt := "page " + utils.FormatNumberOfDigits(totalImages)
-	output = make(chan *tasks)
+	output = make(chan task)
 	go func() {
 		defer close(output)
 		defer pdf.Close()
-		for i := 0; i < totalImages; i++ {
+		for i := range totalImages {
 			var img image.Image
+			var err error
 			if !e.Dry {
 				img, err = pdfimage.Extract(pdf, i+1)
-				if err != nil {
-					fmt.Fprintln(os.Stderr, err)
-					os.Exit(1)
-				}
 			}
 
-			output <- &tasks{
+			name := fmt.Sprintf(pageFmt, i+1)
+			if err != nil {
+				img = e.corruptedImage("", name)
+			}
+			output <- task{
 				Id:    i,
 				Image: img,
 				Path:  "",
-				Name:  fmt.Sprintf(pageFmt, i+1),
+				Name:  name,
+				Error: err,
 			}
 		}
 	}()

internal/pkg/epubimageprocessor/processor.go

@@ -0,0 +1,333 @@
+// Package epubimageprocessor extract and transform image into a compressed jpeg.
+package epubimageprocessor
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+	"sync"
+
+	"github.com/disintegration/gift"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimagefilters"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubprogress"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubzip"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epuboptions"
+)
+
+type EPUBImageProcessor interface {
+	Load() (images []epubimage.EPUBImage, err error)
+	CoverTitleData(o CoverTitleDataOptions) (epubzip.Image, error)
+}
+
+type ePUBImageProcessor struct {
+	epuboptions.EPUBOptions
+}
+
+func New(o epuboptions.EPUBOptions) EPUBImageProcessor {
+	return ePUBImageProcessor{o}
+}
+
+// Load extract and convert images
+func (e ePUBImageProcessor) Load() (images []epubimage.EPUBImage, err error) {
+	images = make([]epubimage.EPUBImage, 0)
+	imageCount, imageInput, err := e.load()
+	if err != nil {
+		return nil, err
+	}
+
+	// dry run, skip conversion
+	if e.Dry {
+		for img := range imageInput {
+			images = append(images, epubimage.EPUBImage{
+				Id:     img.Id,
+				Path:   img.Path,
+				Name:   img.Name,
+				Format: e.Image.Format,
+			})
+		}
+
+		return images, nil
+	}
+
+	imageOutput := make(chan epubimage.EPUBImage)
+
+	// processing
+	bar := epubprogress.New(epubprogress.Options{
+		Quiet:       e.Quiet,
+		Json:        e.Json,
+		Max:         imageCount,
+		Description: "Processing",
+		CurrentJob:  1,
+		TotalJob:    2,
+	})
+	wg := &sync.WaitGroup{}
+
+	imgStorage, err := epubzip.NewStorageImageWriter(e.ImgStorage(), e.Image.Format)
+	if err != nil {
+		_ = bar.Close()
+		return nil, err
+	}
+
+	wr := 50
+	if e.Image.Format == "png" {
+		wr = 100
+	}
+	for range e.WorkersRatio(wr) {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+
+			for input := range imageInput {
+				img := e.transformImage(input, 0, e.Image.Manga)
+
+				// do not keep double page if requested
+				if !(img.DoublePage && input.Id > 0 &&
+					e.EPUBOptions.Image.AutoSplitDoublePage && !e.EPUBOptions.Image.KeepDoublePageIfSplit) {
+					if err = imgStorage.Add(img.EPUBImgPath(), img.Raw, e.Image.Quality); err != nil {
+						_ = bar.Close()
+						utils.Fatalf("error with %s: %s", input.Name, err)
+					}
+					// do not keep raw image except for cover
+					if img.Id > 0 {
+						img.Raw = nil
+					}
+					imageOutput <- img
+				}
+
+				// DOUBLE PAGE
+				if !e.Image.AutoSplitDoublePage || // No split required
+					!img.DoublePage || // Not a double page
+					(e.Image.HasCover && img.Id == 0) { // Cover
+					continue
+				}
+
+				for i, b := range []bool{e.Image.Manga, !e.Image.Manga} {
+					img = e.transformImage(input, i+1, b)
+					if err = imgStorage.Add(img.EPUBImgPath(), img.Raw, e.Image.Quality); err != nil {
+						_ = bar.Close()
+						utils.Fatalf("error with %s: %s", input.Name, err)
+					}
+					img.Raw = nil
+					imageOutput <- img
+				}
+			}
+		}()
+	}
+
+	go func() {
+		wg.Wait()
+		_ = imgStorage.Close()
+		close(imageOutput)
+	}()
+
+	for img := range imageOutput {
+		if img.Part == 0 {
+			_ = bar.Add(1)
+		}
+		if e.Image.NoBlankImage && img.IsBlank {
+			continue
+		}
+		images = append(images, img)
+	}
+	_ = bar.Close()
+
+	if len(images) == 0 {
+		return nil, errNoImagesFound
+	}
+
+	return images, nil
+}
+
+func (e ePUBImageProcessor) createImage(src image.Image, r image.Rectangle) draw.Image {
+	if e.EPUBOptions.Image.GrayScale {
+		return image.NewGray(r)
+	}
+
+	switch t := src.(type) {
+	case *image.Gray:
+		return image.NewGray(r)
+	case *image.Gray16:
+		return image.NewGray16(r)
+	case *image.RGBA:
+		return image.NewRGBA(r)
+	case *image.RGBA64:
+		return image.NewRGBA64(r)
+	case *image.NRGBA:
+		return image.NewNRGBA(r)
+	case *image.NRGBA64:
+		return image.NewNRGBA64(r)
+	case *image.Alpha:
+		return image.NewAlpha(r)
+	case *image.Alpha16:
+		return image.NewAlpha16(r)
+	case *image.CMYK:
+		return image.NewCMYK(r)
+	case *image.Paletted:
+		return image.NewPaletted(r, t.Palette)
+	default:
+		return image.NewNRGBA64(r)
+	}
+}
+
+// transform image into 1 or 3 images
+// only doublepage with autosplit has 3 versions
+func (e ePUBImageProcessor) transformImage(input task, part int, right bool) epubimage.EPUBImage {
+	g := gift.New()
+	src := input.Image
+	srcBounds := src.Bounds()
+
+	// In portrait only, we don't need to keep aspect ratio between each split.
+	// We first cut, the crop.
+	if part > 0 && !e.Image.KeepSplitDoublePageAspect {
+		g.Add(epubimagefilters.CropSplitDoublePage(right))
+	}
+
+	// Lookup for margin if crop is enable or if we want to remove blank image
+	if e.Image.Crop.Enabled || e.Image.NoBlankImage {
+		f := epubimagefilters.AutoCrop(
+			src,
+			g.Bounds(src.Bounds()),
+			e.Image.Crop.Left,
+			e.Image.Crop.Up,
+			e.Image.Crop.Right,
+			e.Image.Crop.Bottom,
+			e.Image.Crop.Limit,
+			e.Image.Crop.SkipIfLimitReached,
+		)
+
+		// detect if blank image
+		size := f.Bounds(srcBounds)
+		isBlank := size.Dx() == 0 && size.Dy() == 0
+
+		// crop is enable or if blank image with noblankimage options
+		if e.Image.Crop.Enabled || (e.Image.NoBlankImage && isBlank) {
+			g.Add(f)
+		}
+	}
+
+	// With landscape support, we need to keep aspect ratio between each split
+	// We first crop, then cut
+	if part > 0 && e.Image.KeepSplitDoublePageAspect {
+		g.Add(epubimagefilters.CropSplitDoublePage(right))
+	}
+
+	dstBounds := g.Bounds(src.Bounds())
+	// Original && Cropped version need to landscape oriented
+	// Only part 0 can be a double page
+	isDoublePage := part == 0 && srcBounds.Dx() > srcBounds.Dy() && dstBounds.Dx() > dstBounds.Dy()
+
+	if e.Image.AutoRotate && isDoublePage {
+		g.Add(gift.Rotate90())
+	}
+
+	if e.Image.AutoContrast {
+		g.Add(epubimagefilters.AutoContrast())
+	}
+
+	if e.Image.Contrast != 0 {
+		g.Add(gift.Contrast(float32(e.Image.Contrast)))
+	}
+
+	if e.Image.Brightness != 0 {
+		g.Add(gift.Brightness(float32(e.Image.Brightness)))
+	}
+
+	if e.Image.Resize {
+		g.Add(gift.ResizeToFit(e.Image.View.Width, e.Image.View.Height, gift.LanczosResampling))
+	}
+
+	if e.Image.GrayScale {
+		var f gift.Filter
+		switch e.Image.GrayScaleMode {
+		case 1: // average
+			f = gift.ColorFunc(func(r0, g0, b0, a0 float32) (r float32, g float32, b float32, a float32) {
+				y := (r0 + g0 + b0) / 3
+				return y, y, y, a0
+			})
+		case 2: // luminance
+			f = gift.ColorFunc(func(r0, g0, b0, a0 float32) (r float32, g float32, b float32, a float32) {
+				y := 0.2126*r0 + 0.7152*g0 + 0.0722*b0
+				return y, y, y, a0
+			})
+		default:
+			f = gift.Grayscale()
+		}
+		g.Add(f)
+	}
+
+	g.Add(epubimagefilters.Pixel())
+
+	dst := e.createImage(src, g.Bounds(src.Bounds()))
+	g.Draw(dst, src)
+
+	return epubimage.EPUBImage{
+		Id:                  input.Id,
+		Part:                part,
+		Raw:                 dst,
+		Width:               dst.Bounds().Dx(),
+		Height:              dst.Bounds().Dy(),
+		IsBlank:             dst.Bounds().Dx() == 1 && dst.Bounds().Dy() == 1,
+		DoublePage:          isDoublePage,
+		Path:                input.Path,
+		Name:                input.Name,
+		Format:              e.Image.Format,
+		OriginalAspectRatio: float64(src.Bounds().Dy()) / float64(src.Bounds().Dx()),
+		Error:               input.Error,
+	}
+
+}
+
+type CoverTitleDataOptions struct {
+	Src         image.Image
+	Name        string
+	Text        string
+	Align       string
+	PctWidth    int
+	PctMargin   int
+	MaxFontSize int
+	BorderSize  int
+}
+
+func (e ePUBImageProcessor) cover16LevelOfGray(bounds image.Rectangle) draw.Image {
+	return image.NewPaletted(bounds, color.Palette{
+		color.Gray{},
+		color.Gray{Y: 0x11},
+		color.Gray{Y: 0x22},
+		color.Gray{Y: 0x33},
+		color.Gray{Y: 0x44},
+		color.Gray{Y: 0x55},
+		color.Gray{Y: 0x66},
+		color.Gray{Y: 0x77},
+		color.Gray{Y: 0x88},
+		color.Gray{Y: 0x99},
+		color.Gray{Y: 0xAA},
+		color.Gray{Y: 0xBB},
+		color.Gray{Y: 0xCC},
+		color.Gray{Y: 0xDD},
+		color.Gray{Y: 0xEE},
+		color.Gray{Y: 0xFF},
+	})
+}
+
+// CoverTitleData create a title page with the cover
+func (e ePUBImageProcessor) CoverTitleData(o CoverTitleDataOptions) (epubzip.Image, error) {
+	// Create a blur version of the cover
+	g := gift.New(epubimagefilters.CoverTitle(o.Text, o.Align, o.PctWidth, o.PctMargin, o.MaxFontSize, o.BorderSize))
+	var dst draw.Image
+	if o.Name == "cover" && e.Image.GrayScale {
+		dst = e.cover16LevelOfGray(o.Src.Bounds())
+	} else {
+		dst = e.createImage(o.Src, g.Bounds(o.Src.Bounds()))
+	}
+	g.Draw(dst, o.Src)
+
+	return epubzip.CompressImage(
+		"OEBPS/Images/"+o.Name+".jpeg",
+		"jpeg",
+		dst,
+		e.Image.Quality,
+	)
+}

internal/pkg/epubprogress/epub_progress.go

@@ -1,35 +1,56 @@
-/*
+// Package epubprogress create a progress bar with custom settings.
-create a progress bar with custom settings.
-*/
 package epubprogress
 
 import (
+	"encoding/json"
 	"fmt"
 	"os"
+	"time"
 
 	"github.com/schollz/progressbar/v3"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
 )
 
 type Options struct {
 	Quiet       bool
+	Json        bool
 	Max         int
 	Description string
 	CurrentJob  int
 	TotalJob    int
 }
 
-func New(o Options) *progressbar.ProgressBar {
+type EPUBProgress interface {
+	Add(num int) error
+	Close() error
+}
+
+func New(o Options) EPUBProgress {
 	if o.Quiet {
 		return progressbar.DefaultSilent(int64(o.Max))
 	}
-	fmtJob := fmt.Sprintf("%%0%dd", len(fmt.Sprint(o.TotalJob)))
+
-	fmtDesc := fmt.Sprintf("[%s/%s] %%-15s", fmtJob, fmtJob)
+	if o.Json {
+		return &jsonprogress{
+			o: o,
+			e: json.NewEncoder(os.Stdout),
+		}
+	}
+
+	fmtJob := utils.FormatNumberOfDigits(o.TotalJob)
 	return progressbar.NewOptions(o.Max,
 		progressbar.OptionSetWriter(os.Stderr),
+		progressbar.OptionThrottle(65*time.Millisecond),
 		progressbar.OptionOnCompletion(func() {
-			fmt.Fprint(os.Stderr, "\n")
+			utils.Println()
 		}),
-		progressbar.OptionSetDescription(fmt.Sprintf(fmtDesc, o.CurrentJob, o.TotalJob, o.Description)),
+		progressbar.OptionSetDescription(fmt.Sprintf(
+			"["+fmtJob+"/"+fmtJob+"] %-15s",
+			o.CurrentJob,
+			o.TotalJob,
+			o.Description,
+		)),
 		progressbar.OptionSetWidth(60),
 		progressbar.OptionShowCount(),
 		progressbar.OptionSetRenderBlankState(true),

internal/pkg/epubprogress/json.go

@@ -0,0 +1,33 @@
+package epubprogress
+
+import (
+	"encoding/json"
+)
+
+type jsonprogress struct {
+	o       Options
+	e       *json.Encoder
+	current int
+}
+
+func (p *jsonprogress) Add(num int) error {
+	p.current += num
+	return p.e.Encode(map[string]any{
+		"type": "epubprogress",
+		"data": map[string]any{
+			"epubprogress": map[string]any{
+				"current": p.current,
+				"total":   p.o.Max,
+			},
+			"steps": map[string]any{
+				"current": p.o.CurrentJob,
+				"total":   p.o.TotalJob,
+			},
+			"description": p.o.Description,
+		},
+	})
+}
+
+func (p *jsonprogress) Close() error {
+	return nil
+}

internal/pkg/epubtemplates/applebooks.go

@@ -0,0 +1,6 @@
+package epubtemplates
+
+import _ "embed"
+
+//go:embed "applebooks.xml.tmpl"
+var AppleBooks string

internal/pkg/epubtemplates/applebooks.xml.tmpl

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <display_options>
   <platform name="*">
+    <option name="interactive">true</option>
     <option name="fixed-layout">true</option>
+    <option name="open-to-spread">true</option>
   </platform>
 </display_options>

internal/pkg/epubtemplates/blank.go

@@ -0,0 +1,7 @@
+// Package epubtemplates Templates use to create xml files of the EPUB.
+package epubtemplates
+
+import _ "embed"
+
+//go:embed "blank.xhtml.tmpl"
+var Blank string

internal/pkg/epubtemplates/container.go

@@ -0,0 +1,6 @@
+package epubtemplates
+
+import _ "embed"
+
+//go:embed "container.xml.tmpl"
+var Container string

internal/pkg/epubtemplates/content.go

@@ -1,23 +1,23 @@
 package epubtemplates
 
 import (
-	"fmt"
-
 	"github.com/beevik/etree"
-	epubimage "github.com/celogeek/go-comic-converter/v2/internal/epub/image"
+
-	epuboptions "github.com/celogeek/go-comic-converter/v2/internal/epub/options"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epuboptions"
 )
 
-type ContentOptions struct {
+type Content struct {
 	Title        string
 	HasTitlePage bool
 	UID          string
 	Author       string
 	Publisher    string
 	UpdatedAt    string
-	ImageOptions *epuboptions.Image
+	ImageOptions epuboptions.Image
-	Cover        *epubimage.Image
+	Cover        epubimage.EPUBImage
-	Images       []*epubimage.Image
+	Images       []epubimage.EPUBImage
 	Current      int
 	Total        int
 }
@@ -30,8 +30,10 @@ type tag struct {
 	value string
 }
 
-// create the content file
+// Get create the content file
-func Content(o *ContentOptions) string {
+//
+//goland:noinspection HttpUrlsUsage,HttpUrlsUsage,HttpUrlsUsage,HttpUrlsUsage
+func (o Content) String() string {
 	doc := etree.NewDocument()
 	doc.CreateProcInst("xml", `version="1.0" encoding="UTF-8"`)
 
@@ -41,8 +43,8 @@ func Content(o *ContentOptions) string {
 	pkg.CreateAttr("version", "3.0")
 	pkg.CreateAttr("prefix", "rendition: http://www.idpf.org/vocab/rendition/#")
 
-	addToElement := func(elm *etree.Element, meth func(o *ContentOptions) []tag) {
+	addToElement := func(elm *etree.Element, meth func() []tag) {
-		for _, p := range meth(o) {
+		for _, p := range meth() {
 			meta := elm.CreateElement(p.name)
 			for k, v := range p.attrs {
 				meta.CreateAttr(k, v)
@@ -57,10 +59,10 @@ func Content(o *ContentOptions) string {
 	metadata := pkg.CreateElement("metadata")
 	metadata.CreateAttr("xmlns:dc", "http://purl.org/dc/elements/1.1/")
 	metadata.CreateAttr("xmlns:opf", "http://www.idpf.org/2007/opf")
-	addToElement(metadata, getMeta)
+	addToElement(metadata, o.getMeta)
 
 	manifest := pkg.CreateElement("manifest")
-	addToElement(manifest, getManifest)
+	addToElement(manifest, o.getManifest)
 
 	spine := pkg.CreateElement("spine")
 	if o.ImageOptions.Manga {
@@ -70,13 +72,13 @@ func Content(o *ContentOptions) string {
 	}
 
 	if o.ImageOptions.View.PortraitOnly {
-		addToElement(spine, getSpinePortrait)
+		addToElement(spine, o.getSpinePortrait)
 	} else {
-		addToElement(spine, getSpineAuto)
+		addToElement(spine, o.getSpineAuto)
 	}
 
 	guide := pkg.CreateElement("guide")
-	addToElement(guide, getGuide)
+	addToElement(guide, o.getGuide)
 
 	doc.Indent(2)
 	r, _ := doc.WriteToString()
@@ -85,7 +87,7 @@ func Content(o *ContentOptions) string {
 }
 
 // metadata part of the content
-func getMeta(o *ContentOptions) []tag {
+func (o Content) getMeta() []tag {
 	metas := []tag{
 		{"meta", tagAttrs{"property": "dcterms:modified"}, o.UpdatedAt},
 		{"meta", tagAttrs{"property": "schema:accessMode"}, "visual"},
@@ -95,9 +97,9 @@ func getMeta(o *ContentOptions) []tag {
 		{"meta", tagAttrs{"property": "schema:accessibilityHazard"}, "noSoundHazard"},
 		{"meta", tagAttrs{"name": "book-type", "content": "comic"}, ""},
 		{"opf:meta", tagAttrs{"name": "fixed-layout", "content": "true"}, ""},
-		{"opf:meta", tagAttrs{"name": "original-resolution", "content": fmt.Sprintf("%dx%d", o.ImageOptions.View.Width, o.ImageOptions.View.Height)}, ""},
+		{"opf:meta", tagAttrs{"name": "original-resolution", "content": o.ImageOptions.View.Dimension()}, ""},
 		{"dc:title", tagAttrs{}, o.Title},
-		{"dc:identifier", tagAttrs{"id": "ean"}, fmt.Sprintf("urn:uuid:%s", o.UID)},
+		{"dc:identifier", tagAttrs{"id": "ean"}, "urn:uuid:" + o.UID},
 		{"dc:language", tagAttrs{}, "en"},
 		{"dc:creator", tagAttrs{}, o.Author},
 		{"dc:publisher", tagAttrs{}, o.Publisher},
@@ -131,18 +133,18 @@ func getMeta(o *ContentOptions) []tag {
 		metas = append(
 			metas,
 			tag{"meta", tagAttrs{"name": "calibre:series", "content": o.Title}, ""},
-			tag{"meta", tagAttrs{"name": "calibre:series_index", "content": fmt.Sprint(o.Current)}, ""},
+			tag{"meta", tagAttrs{"name": "calibre:series_index", "content": utils.IntToString(o.Current)}, ""},
 		)
 	}
 
 	return metas
 }
 
-func getManifest(o *ContentOptions) []tag {
+func (o Content) getManifest() []tag {
 	var imageTags, pageTags, spaceTags []tag
-	addTag := func(img *epubimage.Image, withSpace bool) {
+	addTag := func(img epubimage.EPUBImage, withSpace bool) {
 		imageTags = append(imageTags,
-			tag{"item", tagAttrs{"id": img.ImgKey(), "href": img.ImgPath(), "media-type": fmt.Sprintf("image/%s", o.ImageOptions.Format)}, ""},
+			tag{"item", tagAttrs{"id": img.ImgKey(), "href": img.ImgPath(), "media-type": img.MediaType()}, ""},
 		)
 		pageTags = append(pageTags,
 			tag{"item", tagAttrs{"id": img.PageKey(), "href": img.PagePath(), "media-type": "application/xhtml+xml"}, ""},
@@ -158,13 +160,13 @@ func getManifest(o *ContentOptions) []tag {
 		{"item", tagAttrs{"id": "toc", "href": "toc.xhtml", "properties": "nav", "media-type": "application/xhtml+xml"}, ""},
 		{"item", tagAttrs{"id": "css", "href": "Text/style.css", "media-type": "text/css"}, ""},
 		{"item", tagAttrs{"id": "page_cover", "href": "Text/cover.xhtml", "media-type": "application/xhtml+xml"}, ""},
-		{"item", tagAttrs{"id": "img_cover", "href": fmt.Sprintf("Images/cover.%s", o.ImageOptions.Format), "media-type": fmt.Sprintf("image/%s", o.ImageOptions.Format)}, ""},
+		{"item", tagAttrs{"id": "img_cover", "href": "Images/cover.jpeg", "media-type": "image/jpeg"}, ""},
 	}
 
 	if o.HasTitlePage {
 		items = append(items,
 			tag{"item", tagAttrs{"id": "page_title", "href": "Text/title.xhtml", "media-type": "application/xhtml+xml"}, ""},
-			tag{"item", tagAttrs{"id": "img_title", "href": fmt.Sprintf("Images/title.%s", o.ImageOptions.Format), "media-type": fmt.Sprintf("image/%s", o.ImageOptions.Format)}, ""},
+			tag{"item", tagAttrs{"id": "img_title", "href": "Images/title.jpeg", "media-type": "image/jpeg"}, ""},
 		)
 
 		if !o.ImageOptions.View.PortraitOnly {
@@ -174,7 +176,12 @@ func getManifest(o *ContentOptions) []tag {
 
 	lastImage := o.Images[len(o.Images)-1]
 	for _, img := range o.Images {
-		addTag(img, !o.ImageOptions.View.PortraitOnly && (img.DoublePage || (img.Part == 0 && img == lastImage)))
+		addTag(
+			img,
+			!o.ImageOptions.View.PortraitOnly &&
+				(img.DoublePage ||
+					(!o.ImageOptions.KeepDoublePageIfSplit && img.Part == 1) ||
+					(img.Part == 0 && img == lastImage)))
 	}
 
 	items = append(items, imageTags...)
@@ -185,8 +192,11 @@ func getManifest(o *ContentOptions) []tag {
 }
 
 // spine part of the content
-func getSpineAuto(o *ContentOptions) []tag {
+func (o Content) getSpineAuto() []tag {
 	isOnTheRight := !o.ImageOptions.Manga
+	if o.ImageOptions.AppleBookCompatibility {
+		isOnTheRight = !isOnTheRight
+	}
 	getSpread := func(isDoublePage bool) string {
 		isOnTheRight = !isOnTheRight
 		if isDoublePage {
@@ -201,18 +211,24 @@ func getSpineAuto(o *ContentOptions) []tag {
 		}
 	}
 	getSpreadBlank := func() string {
-		return fmt.Sprintf("%s layout-blank", getSpread(false))
+		return getSpread(false) + " layout-blank"
 	}
 
-	spine := []tag{}
+	var spine []tag
 	if o.HasTitlePage {
+		if !o.ImageOptions.AppleBookCompatibility {
 			spine = append(spine,
 				tag{"itemref", tagAttrs{"idref": "space_title", "properties": getSpreadBlank()}, ""},
 				tag{"itemref", tagAttrs{"idref": "page_title", "properties": getSpread(false)}, ""},
 			)
+		} else {
+			spine = append(spine,
+				tag{"itemref", tagAttrs{"idref": "page_title", "properties": getSpread(true)}, ""},
+			)
 		}
-	for _, img := range o.Images {
+	}
-		if img.DoublePage && o.ImageOptions.Manga == isOnTheRight {
+	for i, img := range o.Images {
+		if (img.DoublePage || img.Part == 1) && o.ImageOptions.Manga == isOnTheRight {
 			spine = append(spine, tag{
 				"itemref",
 				tagAttrs{"idref": img.SpaceKey(), "properties": getSpreadBlank()},
@@ -226,6 +242,8 @@ func getSpineAuto(o *ContentOptions) []tag {
 			tagAttrs{"idref": img.PageKey(), "properties": img.Position},
 			"",
 		})
+		// save position, img is a value type
+		o.Images[i] = img
 	}
 	if o.ImageOptions.Manga == isOnTheRight {
 		spine = append(spine, tag{
@@ -238,8 +256,8 @@ func getSpineAuto(o *ContentOptions) []tag {
 	return spine
 }
 
-func getSpinePortrait(o *ContentOptions) []tag {
+func (o Content) getSpinePortrait() []tag {
-	spine := []tag{}
+	var spine []tag
 	if o.HasTitlePage {
 		spine = append(spine,
 			tag{"itemref", tagAttrs{"idref": "page_title"}, ""},
@@ -255,8 +273,8 @@ func getSpinePortrait(o *ContentOptions) []tag {
 	return spine
 }
 
-// guide part of the content
+// getGuide Section guide of the content
-func getGuide(o *ContentOptions) []tag {
+func (o Content) getGuide() []tag {
 	return []tag{
 		{"reference", tagAttrs{"type": "cover", "title": "cover", "href": "Text/cover.xhtml"}, ""},
 		{"reference", tagAttrs{"type": "text", "title": "content", "href": o.Images[0].PagePath()}, ""},

internal/pkg/epubtemplates/style.css.tmpl

@@ -15,4 +15,5 @@ img {
   margin:0;
   padding:0;
   z-index:0;
+  object-fit: contain;
 }

internal/pkg/epubtemplates/style.go

@@ -0,0 +1,6 @@
+package epubtemplates
+
+import _ "embed"
+
+//go:embed "style.css.tmpl"
+var Style string

internal/pkg/epubtemplates/text.go

@@ -0,0 +1,6 @@
+package epubtemplates
+
+import _ "embed"
+
+//go:embed "text.xhtml.tmpl"
+var Text string

internal/pkg/epubtemplates/toc.go

@@ -5,11 +5,14 @@ import (
 	"strings"
 
 	"github.com/beevik/etree"
-	epubimage "github.com/celogeek/go-comic-converter/v2/internal/epub/image"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
 )
 
-// create toc
+// Toc create toc
-func Toc(title string, hasTitle bool, stripFirstDirectoryFromToc bool, images []*epubimage.Image) string {
+//
+//goland:noinspection HttpUrlsUsage
+func Toc(title string, hasTitle bool, stripFirstDirectoryFromToc bool, images []epubimage.EPUBImage) string {
 	doc := etree.NewDocument()
 	doc.CreateProcInst("xml", `version="1.0" encoding="UTF-8"`)
 	doc.CreateDirective("DOCTYPE html")

internal/pkg/epubtree/epub_tree.go

@@ -0,0 +1,83 @@
+/*
+Package epubtree Organize a list of filename with their path into a tree of directories.
+
+Example:
+  - A/B/C/D.jpg
+  - A/B/C/E.jpg
+  - A/B/F/G.jpg
+
+This is transformed like:
+
+	A
+	 B
+	  C
+	   D.jpg
+	   E.jpg
+	 F
+	  G.jpg
+*/
+package epubtree
+
+import (
+	"path/filepath"
+	"strings"
+)
+
+type EPUBTree struct {
+	nodes map[string]*Node
+}
+
+type Node struct {
+	value    string
+	children []*Node
+}
+
+// New initialize tree with a root node
+func New() *EPUBTree {
+	return &EPUBTree{map[string]*Node{
+		".": {".", []*Node{}},
+	}}
+}
+
+// Root root node
+func (n *EPUBTree) Root() *Node {
+	return n.nodes["."]
+}
+
+// Add the filename to the tree
+func (n *EPUBTree) Add(filename string) {
+	cn := n.Root()
+	cp := ""
+	for _, p := range strings.Split(filepath.Clean(filename), string(filepath.Separator)) {
+		cp = filepath.Join(cp, p)
+		if _, ok := n.nodes[cp]; !ok {
+			n.nodes[cp] = &Node{value: p, children: []*Node{}}
+			cn.children = append(cn.children, n.nodes[cp])
+		}
+		cn = n.nodes[cp]
+	}
+}
+
+func (n *Node) ChildCount() int {
+	return len(n.children)
+}
+
+func (n *Node) FirstChild() *Node {
+	return n.children[0]
+}
+
+// WriteString string version of the tree
+func (n *Node) WriteString(indent string) string {
+	r := strings.Builder{}
+	if indent != "" {
+		r.WriteString(indent)
+		r.WriteString("- ")
+		r.WriteString(n.value)
+		r.WriteString("\n")
+	}
+	indent += "  "
+	for _, c := range n.children {
+		r.WriteString(c.WriteString(indent))
+	}
+	return r.String()
+}

internal/pkg/epubzip/epub_zip.go

@@ -1,5 +1,5 @@
 /*
-Helper to write EPUB files.
+Package epubzip Helper to write EPUB files.
 
 We create a zip with the magic EPUB mimetype.
 */
@@ -16,29 +16,31 @@ type EPUBZip struct {
 	wz *zip.Writer
 }
 
-// create a new EPUB
+// New create a new EPUB
-func New(path string) (*EPUBZip, error) {
+func New(path string) (EPUBZip, error) {
 	w, err := os.Create(path)
 	if err != nil {
-		return nil, err
+		return EPUBZip{}, err
 	}
 	wz := zip.NewWriter(w)
-	return &EPUBZip{w, wz}, nil
+	return EPUBZip{w, wz}, nil
 }
 
-// close compress pipe and file.
+// Close compress pipe and file.
-func (e *EPUBZip) Close() error {
+func (e EPUBZip) Close() error {
 	if err := e.wz.Close(); err != nil {
 		return err
 	}
 	return e.w.Close()
 }
 
-// Write mimetype, in a very specific way.
+// WriteMagic Write mimetype, in a very specific way.
+//
 // This will be valid with epubcheck tools.
-func (e *EPUBZip) WriteMagic() error {
+func (e EPUBZip) WriteMagic() error {
-	t := time.Now()
+	t := time.Now().UTC()
-	fh := &zip.FileHeader{
+	//goland:noinspection GoDeprecation
+	fh := zip.FileHeader{
 		Name:               "mimetype",
 		Method:             zip.Store,
 		Modified:           t,
@@ -48,8 +50,10 @@ func (e *EPUBZip) WriteMagic() error {
 		UncompressedSize64: 20,
 		CRC32:              0x2cab616f,
 	}
+	fh.CreatorVersion = fh.CreatorVersion&0xff00 | 20 // preserve compatibility byte
+	fh.ReaderVersion = 20
 	fh.SetMode(0600)
-	m, err := e.wz.CreateRaw(fh)
+	m, err := e.wz.CreateRaw(&fh)
 
 	if err != nil {
 		return err
@@ -58,12 +62,12 @@ func (e *EPUBZip) WriteMagic() error {
 	return err
 }
 
-func (e *EPUBZip) Copy(fz *zip.File) error {
+func (e EPUBZip) Copy(fz *zip.File) error {
 	return e.wz.Copy(fz)
 }
 
-// Write image. They are already compressed, so we write them down directly.
+// WriteRaw Write image. They are already compressed, so we write them down directly.
-func (e *EPUBZip) WriteRaw(raw *ZipImage) error {
+func (e EPUBZip) WriteRaw(raw Image) error {
 	m, err := e.wz.CreateRaw(raw.Header)
 	if err != nil {
 		return err
@@ -72,8 +76,8 @@ func (e *EPUBZip) WriteRaw(raw *ZipImage) error {
 	return err
 }
 
-// Write file. Compressed it using deflate.
+// WriteContent Write file. Compressed it using deflate.
-func (e *EPUBZip) WriteContent(file string, content []byte) error {
+func (e EPUBZip) WriteContent(file string, content []byte) error {
 	m, err := e.wz.CreateHeader(&zip.FileHeader{
 		Name:     file,
 		Modified: time.Now(),

internal/pkg/epubzip/image.go

@@ -12,13 +12,13 @@ import (
 	"time"
 )
 
-type ZipImage struct {
+type Image struct {
 	Header *zip.FileHeader
 	Data   []byte
 }
 
-// create gzip encoded jpeg
+// CompressImage create gzip encoded jpeg
-func CompressImage(filename string, format string, img image.Image, quality int) (*ZipImage, error) {
+func CompressImage(filename string, format string, img image.Image, quality int) (Image, error) {
 	var (
 		data, cdata bytes.Buffer
 		err         error
@@ -33,26 +33,27 @@ func CompressImage(filename string, format string, img image.Image, quality int)
 		err = fmt.Errorf("unknown format %q", format)
 	}
 	if err != nil {
-		return nil, err
+		return Image{}, err
 	}
 
 	wcdata, err := flate.NewWriter(&cdata, flate.BestCompression)
 	if err != nil {
-		return nil, err
+		return Image{}, err
 	}
 
 	_, err = wcdata.Write(data.Bytes())
 	if err != nil {
-		return nil, err
+		return Image{}, err
 	}
 
 	err = wcdata.Close()
 	if err != nil {
-		return nil, err
+		return Image{}, err
 	}
 
 	t := time.Now()
-	return &ZipImage{
+	//goland:noinspection GoDeprecation
+	return Image{
 		&zip.FileHeader{
 			Name:               filename,
 			CompressedSize64:   uint64(cdata.Len()),
@@ -65,3 +66,39 @@ func CompressImage(filename string, format string, img image.Image, quality int)
 		cdata.Bytes(),
 	}, nil
 }
+
+func CompressRaw(filename string, uncompressedData []byte) (Image, error) {
+	var (
+		cdata bytes.Buffer
+		err   error
+	)
+	wcdata, err := flate.NewWriter(&cdata, flate.BestCompression)
+	if err != nil {
+		return Image{}, err
+	}
+
+	_, err = wcdata.Write(uncompressedData)
+	if err != nil {
+		return Image{}, err
+	}
+
+	err = wcdata.Close()
+	if err != nil {
+		return Image{}, err
+	}
+
+	t := time.Now()
+	//goland:noinspection GoDeprecation
+	return Image{
+		&zip.FileHeader{
+			Name:               filename,
+			CompressedSize64:   uint64(cdata.Len()),
+			UncompressedSize64: uint64(len(uncompressedData)),
+			CRC32:              crc32.Checksum(uncompressedData, crc32.IEEETable),
+			Method:             zip.Deflate,
+			ModifiedTime:       uint16(t.Second()/2 + t.Minute()<<5 + t.Hour()<<11),
+			ModifiedDate:       uint16(t.Day() + int(t.Month())<<5 + (t.Year()-1980)<<9),
+		},
+		cdata.Bytes(),
+	}, nil
+}

internal/pkg/epubzip/storage_image_reader.go

@@ -0,0 +1,53 @@
+package epubzip
+
+import (
+	"archive/zip"
+	"os"
+)
+
+type StorageImageReader struct {
+	filename string
+	fh       *os.File
+	fz       *zip.Reader
+
+	files map[string]*zip.File
+}
+
+func NewStorageImageReader(filename string) (StorageImageReader, error) {
+	fh, err := os.Open(filename)
+	if err != nil {
+		return StorageImageReader{}, err
+	}
+	s, err := fh.Stat()
+	if err != nil {
+		return StorageImageReader{}, err
+	}
+	fz, err := zip.NewReader(fh, s.Size())
+	if err != nil {
+		return StorageImageReader{}, err
+	}
+	files := map[string]*zip.File{}
+	for _, z := range fz.File {
+		files[z.Name] = z
+	}
+	return StorageImageReader{filename, fh, fz, files}, nil
+}
+
+func (e StorageImageReader) Get(filename string) *zip.File {
+	return e.files[filename]
+}
+
+func (e StorageImageReader) Size(filename string) uint64 {
+	if img, ok := e.files[filename]; ok {
+		return img.CompressedSize64 + 30 + uint64(len(img.Name))
+	}
+	return 0
+}
+
+func (e StorageImageReader) Close() error {
+	return e.fh.Close()
+}
+
+func (e StorageImageReader) Remove() error {
+	return os.Remove(e.filename)
+}

internal/pkg/epubzip/storage_image_writer.go

@@ -0,0 +1,73 @@
+package epubzip
+
+import (
+	"archive/zip"
+	"image"
+	"os"
+	"sync"
+)
+
+type StorageImageWriter struct {
+	fh     *os.File
+	fz     *zip.Writer
+	format string
+	mut    *sync.Mutex
+}
+
+func NewStorageImageWriter(filename string, format string) (StorageImageWriter, error) {
+	fh, err := os.Create(filename)
+	if err != nil {
+		return StorageImageWriter{}, err
+	}
+	fz := zip.NewWriter(fh)
+	return StorageImageWriter{fh, fz, format, &sync.Mutex{}}, nil
+}
+
+func (e StorageImageWriter) Close() error {
+	if err := e.fz.Close(); err != nil {
+		_ = e.fh.Close()
+		return err
+	}
+	return e.fh.Close()
+}
+
+func (e StorageImageWriter) Add(filename string, img image.Image, quality int) error {
+	zipImage, err := CompressImage(filename, e.format, img, quality)
+	if err != nil {
+		return err
+	}
+
+	e.mut.Lock()
+	defer e.mut.Unlock()
+	fh, err := e.fz.CreateRaw(zipImage.Header)
+	if err != nil {
+		return err
+	}
+	_, err = fh.Write(zipImage.Data)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (e StorageImageWriter) AddRaw(filename string, uncompressedData []byte) error {
+	zipImage, err := CompressRaw(filename, uncompressedData)
+
+	if err != nil {
+		return err
+	}
+
+	e.mut.Lock()
+	defer e.mut.Unlock()
+	fh, err := e.fz.CreateRaw(zipImage.Header)
+	if err != nil {
+		return err
+	}
+	_, err = fh.Write(zipImage.Data)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

internal/pkg/sortpath/by.go

@@ -1,7 +1,7 @@
 /*
-sortpath support sorting of path that may include number.
+Package sortpath support sorting of path that may include number.
 
-A series of path can looks like:
+A series of path can look like:
   - Tome1/Chap1/Image1.jpg
   - Tome1/Chap2/Image1.jpg
   - Tome1/Chap10/Image2.jpg
@@ -11,8 +11,8 @@ and compare them by decomposing the string and number part.
 
 The module support 3 mode:
   - mode=0 alpha for path and file
-  - mode=1 alphanum for path and alpha for file
+  - mode=1 alphanumeric for path and alpha for file
-  - mode=2 alphanum for path and file
+  - mode=2 alphanumeric for path and file
 
 Example:
 
@@ -26,6 +26,8 @@ Example:
 */
 package sortpath
 
+import "sort"
+
 // struct that implement interface for sort.Sort
 type by struct {
 	filenames []string
@@ -39,9 +41,9 @@ func (b by) Swap(i, j int) {
 	b.paths[i], b.paths[j] = b.paths[j], b.paths[i]
 }
 
-// use sortpath.By with sort.Sort
+// By use sortpath.By with sort.Sort
-func By(filenames []string, mode int) by {
+func By(filenames []string, mode int) sort.Interface {
-	p := [][]part{}
+	var p [][]part
 	for _, filename := range filenames {
 		p = append(p, parse(filename, mode))
 	}

internal/pkg/sortpath/parser.go

@@ -8,7 +8,7 @@ import (
 )
 
 // Strings follow with numbers like: s1, s1.2, s2-3, ...
-var split_path_regex = regexp.MustCompile(`^(.*?)(\d+(?:\.\d+)?)(?:-(\d+(?:\.\d+)?))?$`)
+var splitPathRegex = regexp.MustCompile(`^(.*?)(\d+(?:\.\d+)?)(?:-(\d+(?:\.\d+)?))?$`)
 
 type part struct {
 	fullname string
@@ -31,7 +31,7 @@ func (a part) compare(b part) float64 {
 
 // separate from the string the number part.
 func parsePart(p string) part {
-	r := split_path_regex.FindStringSubmatch(p)
+	r := splitPathRegex.FindStringSubmatch(p)
 	if len(r) == 0 {
 		return part{p, p, 0}
 	}
@@ -43,23 +43,23 @@ func parsePart(p string) part {
 }
 
 // mode=0 alpha for path and file
-// mode=1 alphanum for path and alpha for file
+// mode=1 alphanumeric for path and alpha for file
-// mode=2 alphanum for path and file
+// mode=2 alphanumeric for path and file
 func parse(filename string, mode int) []part {
 	pathname, name := filepath.Split(strings.ToLower(filename))
 	pathname = strings.TrimSuffix(pathname, string(filepath.Separator))
 	ext := filepath.Ext(name)
 	name = name[0 : len(name)-len(ext)]
 
-	f := []part{}
+	var f []part
 	for _, p := range strings.Split(pathname, string(filepath.Separator)) {
-		if mode > 0 { // alphanum for path
+		if mode > 0 { // alphanumeric for path
 			f = append(f, parsePart(p))
 		} else {
 			f = append(f, part{p, p, 0})
 		}
 	}
-	if mode == 2 { // alphanum for file
+	if mode == 2 { // alphanumeric for file
 		f = append(f, parsePart(name))
 	} else {
 		f = append(f, part{name, name, 0})
@@ -67,13 +67,13 @@ func parse(filename string, mode int) []part {
 	return f
 }
 
-// compare 2 fullpath splitted into parts
+// compare 2 full path split into parts
 func compareParts(a, b []part) float64 {
 	m := len(a)
 	if m > len(b) {
 		m = len(b)
 	}
-	for i := 0; i < m; i++ {
+	for i := range m {
 		c := a[i].compare(b[i])
 		if c != 0 {
 			return c

internal/pkg/utils/utils.go

@@ -0,0 +1,56 @@
+package utils
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func Printf(format string, a ...interface{}) {
+	_, _ = fmt.Fprintf(os.Stderr, format, a...)
+}
+
+func Fatalf(format string, args ...interface{}) {
+	Printf(format, args...)
+	os.Exit(1)
+}
+
+func Println(a ...interface{}) {
+	_, _ = fmt.Fprintln(os.Stderr, a...)
+}
+
+func Fatalln(a ...interface{}) {
+	Println(a...)
+	os.Exit(1)
+}
+
+func IntToString(i int) string {
+	return strconv.FormatInt(int64(i), 10)
+}
+
+func FloatToString(f float64, precision int) string {
+	return strconv.FormatFloat(f, 'f', precision, 64)
+}
+
+func BoolToString(b bool) string {
+	if b {
+		return "true"
+	}
+	return "false"
+}
+
+func NumberOfDigits(i int) int {
+	x, count := 10, 1
+	if i < 0 {
+		i = -i
+		count++
+	}
+	for ; x <= i; count++ {
+		x *= 10
+	}
+	return count
+}
+
+func FormatNumberOfDigits(i int) string {
+	return "%0" + IntToString(NumberOfDigits(i)) + "d"
+}

internal/pkg/utils/utils_test.go

@@ -0,0 +1,62 @@
+package utils
+
+import "fmt"
+
+func ExampleFloatToString() {
+	fmt.Println("test=" + FloatToString(3.14151617, 0) + "=")
+	fmt.Println("test=" + FloatToString(3.14151617, 1) + "=")
+	fmt.Println("test=" + FloatToString(3.14151617, 2) + "=")
+	fmt.Println("test=" + FloatToString(3.14151617, 4) + "=")
+	// Output: test=3=
+	// test=3.1=
+	// test=3.14=
+	// test=3.1415=
+}
+
+func ExampleIntToString() {
+	fmt.Println("test=" + IntToString(159) + "=")
+	// Output: test=159=
+}
+
+func ExampleNumberOfDigits() {
+	fmt.Println(NumberOfDigits(0))
+	fmt.Println(NumberOfDigits(4))
+	fmt.Println(NumberOfDigits(10))
+	fmt.Println(NumberOfDigits(14))
+	fmt.Println(NumberOfDigits(256))
+	fmt.Println(NumberOfDigits(2004))
+	fmt.Println(NumberOfDigits(-5))
+	fmt.Println(NumberOfDigits(-10))
+	fmt.Println(NumberOfDigits(-12))
+
+	// Output: 1
+	// 1
+	// 2
+	// 2
+	// 3
+	// 4
+	// 2
+	// 3
+	// 3
+}
+
+func ExampleFormatNumberOfDigits() {
+	fmt.Println(FormatNumberOfDigits(0))
+	fmt.Println(FormatNumberOfDigits(4))
+	fmt.Println(FormatNumberOfDigits(10))
+	fmt.Println(FormatNumberOfDigits(14))
+	fmt.Println(FormatNumberOfDigits(256))
+	fmt.Println(FormatNumberOfDigits(2004))
+	fmt.Println(FormatNumberOfDigits(-5))
+	fmt.Println(FormatNumberOfDigits(-10))
+	fmt.Println(FormatNumberOfDigits(-12))
+	// Output: %01d
+	// %01d
+	// %02d
+	// %02d
+	// %03d
+	// %04d
+	// %02d
+	// %03d
+	// %03d
+}

main.go

@@ -1,21 +1,22 @@
 /*
 Convert CBZ/CBR/Dir into EPUB for e-reader devices (Kindle Devices, ...)
 
-My goal is to make a simple, crossplatform, and fast tool to convert comics into EPUB.
+My goal is to make a simple, cross-platform, and fast tool to convert comics into EPUB.
 
 EPUB is now support by Amazon through [SendToKindle](https://www.amazon.com/gp/sendtokindle/), by Email or by using the App. So I've made it simple to support the size limit constraint of those services.
 */
 package main
 
 import (
-	"fmt"
+	"encoding/json"
 	"os"
 	"runtime/debug"
 
-	"github.com/celogeek/go-comic-converter/v2/internal/converter"
-	"github.com/celogeek/go-comic-converter/v2/internal/epub"
-	epuboptions "github.com/celogeek/go-comic-converter/v2/internal/epub/options"
 	"github.com/tcnksm/go-latest"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/converter"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epub"
 )
 
 func main() {
@@ -26,11 +27,25 @@ func main() {
 	cmd.InitParse()
 	cmd.Parse()
 
-	if cmd.Options.Version {
+	switch {
+	case cmd.Options.Version:
+		version()
+	case cmd.Options.Save:
+		save(cmd)
+	case cmd.Options.Show:
+		show(cmd)
+	case cmd.Options.Reset:
+		reset(cmd)
+	default:
+		generate(cmd)
+	}
+
+}
+
+func version() {
 	bi, ok := debug.ReadBuildInfo()
 	if !ok {
-			fmt.Fprintln(os.Stderr, "failed to fetch current version")
+		utils.Fatalln("failed to fetch current version")
-			os.Exit(1)
 	}
 
 	githubTag := &latest.GithubTag{
@@ -38,13 +53,15 @@ func main() {
 		Repository: "go-comic-converter",
 	}
 	v, err := githubTag.Fetch()
-		if err != nil || len(v.Versions) < 1 {
+	if err != nil {
-			fmt.Fprintln(os.Stderr, "failed to fetch the latest version")
+		utils.Fatalln("failed to fetch the latest version")
-			os.Exit(1)
 	}
-		latest_version := v.Versions[0]
+	if len(v.Versions) < 1 {
+		utils.Fatalln("no versions found")
+	}
+	latestVersion := v.Versions[0]
 
-		fmt.Fprintf(os.Stderr, `go-comic-converter
+	utils.Printf(`go-comic-converter
   Path             : %s
   Sum              : %s
   Version          : %s
@@ -56,83 +73,60 @@ $ go install github.com/celogeek/go-comic-converter/v%d@%s
 		bi.Main.Path,
 		bi.Main.Sum,
 		bi.Main.Version,
-			latest_version.Original(),
+		latestVersion.Original(),
-			latest_version.Segments()[0],
+		latestVersion.Segments()[0],
-			latest_version.Original(),
+		latestVersion.Original(),
 	)
-		return
 }
 
-	if cmd.Options.Save {
+func save(cmd *converter.Converter) {
-		cmd.Options.SaveConfig()
+	if err := cmd.Options.SaveConfig(); err != nil {
-		fmt.Fprintf(
+		cmd.Fatal(err)
-			os.Stderr,
+	}
+	utils.Printf(
 		"%s%s\n\nSaving to %s\n",
 		cmd.Options.Header(),
 		cmd.Options.ShowConfig(),
 		cmd.Options.FileName(),
 	)
-		return
 }
 
-	if cmd.Options.Show {
+func show(cmd *converter.Converter) {
-		fmt.Fprintln(os.Stderr, cmd.Options.Header(), cmd.Options.ShowConfig())
+	utils.Println(cmd.Options.Header(), cmd.Options.ShowConfig())
-		return
 }
 
-	if cmd.Options.Reset {
+func reset(cmd *converter.Converter) {
-		cmd.Options.ResetConfig()
+	if err := cmd.Options.ResetConfig(); err != nil {
-		fmt.Fprintf(
+		cmd.Fatal(err)
-			os.Stderr,
+	}
+	utils.Printf(
 		"%s%s\n\nReset default to %s\n",
 		cmd.Options.Header(),
 		cmd.Options.ShowConfig(),
 		cmd.Options.FileName(),
 	)
-		return
 }
 
+func generate(cmd *converter.Converter) {
 	if err := cmd.Validate(); err != nil {
 		cmd.Fatal(err)
 	}
 
-	fmt.Fprintln(os.Stderr, cmd.Options)
+	if profile := cmd.Options.GetProfile(); profile != nil {
+		cmd.Options.Image.View.Width = profile.Width
+		cmd.Options.Image.View.Height = profile.Height
+	}
 
-	profile := cmd.Options.GetProfile()
+	if cmd.Options.Json {
+		_ = json.NewEncoder(os.Stdout).Encode(map[string]any{
+			"type": "options", "data": cmd.Options,
+		})
+	} else {
+		utils.Println(cmd.Options)
+	}
 
-	if err := epub.New(&epuboptions.Options{
+	if err := epub.New(cmd.Options.EPUBOptions).Write(); err != nil {
-		Input:                      cmd.Options.Input,
+		utils.Fatalf("Error: %v\n", err)
-		Output:                     cmd.Options.Output,
-		LimitMb:                    cmd.Options.LimitMb,
-		Title:                      cmd.Options.Title,
-		TitlePage:                  cmd.Options.TitlePage,
-		Author:                     cmd.Options.Author,
-		StripFirstDirectoryFromToc: cmd.Options.StripFirstDirectoryFromToc,
-		SortPathMode:               cmd.Options.SortPathMode,
-		Workers:                    cmd.Options.Workers,
-		Dry:                        cmd.Options.Dry,
-		DryVerbose:                 cmd.Options.DryVerbose,
-		Quiet:                      cmd.Options.Quiet,
-		Image: &epuboptions.Image{
-			Crop:                &epuboptions.Crop{Enabled: cmd.Options.Crop, Left: cmd.Options.CropRatioLeft, Up: cmd.Options.CropRatioUp, Right: cmd.Options.CropRatioRight, Bottom: cmd.Options.CropRatioBottom},
-			Quality:             cmd.Options.Quality,
-			Brightness:          cmd.Options.Brightness,
-			Contrast:            cmd.Options.Contrast,
-			AutoContrast:        cmd.Options.AutoContrast,
-			AutoRotate:          cmd.Options.AutoRotate,
-			AutoSplitDoublePage: cmd.Options.AutoSplitDoublePage,
-			NoBlankImage:        cmd.Options.NoBlankImage,
-			Manga:               cmd.Options.Manga,
-			HasCover:            cmd.Options.HasCover,
-			View:                &epuboptions.View{Width: profile.Width, Height: profile.Height, AspectRatio: cmd.Options.AspectRatio, PortraitOnly: cmd.Options.PortraitOnly, Color: epuboptions.Color{Foreground: cmd.Options.ForegroundColor, Background: cmd.Options.BackgroundColor}},
-			GrayScale:           cmd.Options.Grayscale,
-			GrayScaleMode:       cmd.Options.GrayscaleMode,
-			Resize:              !cmd.Options.NoResize,
-			Format:              cmd.Options.Format,
-		},
-	}).Write(); err != nil {
-		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
-		os.Exit(1)
 	}
 	if !cmd.Options.Dry {
 		cmd.Stats()

pkg/epub/epub.go

@@ -0,0 +1,509 @@
+// Package epub Tools to create EPUB from images.
+package epub
+
+import (
+	"archive/zip"
+	"fmt"
+	"math"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strings"
+	"text/template"
+	"time"
+
+	"github.com/gofrs/uuid"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimagepassthrough"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimageprocessor"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubprogress"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubtemplates"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubtree"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubzip"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+	"github.com/celogeek/go-comic-converter/v3/pkg/epuboptions"
+)
+
+type EPUB interface {
+	Write() error
+}
+
+type epub struct {
+	epuboptions.EPUBOptions
+	UID       string
+	Publisher string
+	UpdatedAt string
+
+	templateProcessor *template.Template
+	imageProcessor    epubimageprocessor.EPUBImageProcessor
+}
+
+type epubPart struct {
+	Cover  epubimage.EPUBImage
+	Images []epubimage.EPUBImage
+}
+
+// New initialize EPUB
+func New(options epuboptions.EPUBOptions) EPUB {
+	uid := uuid.Must(uuid.NewV4())
+	tmpl := template.New("parser")
+	tmpl.Funcs(template.FuncMap{
+		"mod":  func(i, j int) bool { return i%j == 0 },
+		"zoom": func(s int, z float32) int { return int(float32(s) * z) },
+	})
+
+	var imageProcessor epubimageprocessor.EPUBImageProcessor
+	if options.Image.Format == "copy" {
+		imageProcessor = epubimagepassthrough.New(options)
+	} else {
+		imageProcessor = epubimageprocessor.New(options)
+	}
+
+	return epub{
+		EPUBOptions:       options,
+		UID:               uid.String(),
+		Publisher:         "GO Comic Converter",
+		UpdatedAt:         time.Now().UTC().Format("2006-01-02T15:04:05Z"),
+		templateProcessor: tmpl,
+		imageProcessor:    imageProcessor,
+	}
+}
+
+// render templates
+func (e epub) render(templateString string, data map[string]any) string {
+	var result strings.Builder
+	tmpl := template.Must(e.templateProcessor.Parse(templateString))
+	if err := tmpl.Execute(&result, data); err != nil {
+		panic(err)
+	}
+	return regexp.MustCompile("\n+").ReplaceAllString(result.String(), "\n")
+}
+
+// write image to the zip
+func (e epub) writeImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, zipImg *zip.File) error {
+	err := wz.WriteContent(
+		img.EPUBPagePath(),
+		[]byte(e.render(epubtemplates.Text, map[string]any{
+			"Title":      "Image " + utils.IntToString(img.Id) + " Part " + utils.IntToString(img.Part),
+			"ViewPort":   e.Image.View.Port(),
+			"ImagePath":  img.ImgPath(),
+			"ImageStyle": img.ImgStyle(e.Image.View.Width, e.Image.View.Height, ""),
+		})),
+	)
+	if err == nil {
+		err = wz.Copy(zipImg)
+	}
+
+	return err
+}
+
+// write blank page
+func (e epub) writeBlank(wz epubzip.EPUBZip, img epubimage.EPUBImage) error {
+	return wz.WriteContent(
+		img.EPUBSpacePath(),
+		[]byte(e.render(epubtemplates.Blank, map[string]any{
+			"Title":    "Blank Page " + utils.IntToString(img.Id),
+			"ViewPort": e.Image.View.Port(),
+		})),
+	)
+}
+
+// write title image
+func (e epub) writeCoverImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, part, totalParts int) error {
+	title := "Cover"
+	text := ""
+	if totalParts > 1 {
+		text = utils.IntToString(part) + " / " + utils.IntToString(totalParts)
+		title = title + " " + text
+	}
+
+	if err := wz.WriteContent(
+		"OEBPS/Text/cover.xhtml",
+		[]byte(e.render(epubtemplates.Text, map[string]any{
+			"Title":      title,
+			"ViewPort":   e.Image.View.Port(),
+			"ImagePath":  "Images/cover.jpeg",
+			"ImageStyle": img.ImgStyle(e.Image.View.Width, e.Image.View.Height, ""),
+		})),
+	); err != nil {
+		return err
+	}
+
+	coverTitle, err := e.imageProcessor.CoverTitleData(epubimageprocessor.CoverTitleDataOptions{
+		Src:         img.Raw,
+		Name:        "cover",
+		Text:        text,
+		Align:       "bottom",
+		PctWidth:    50,
+		PctMargin:   50,
+		MaxFontSize: 96,
+		BorderSize:  8,
+	})
+
+	if err != nil {
+		return err
+	}
+
+	if err := wz.WriteRaw(coverTitle); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// write title image
+func (e epub) writeTitleImage(wz epubzip.EPUBZip, img epubimage.EPUBImage, title string) error {
+	titleAlign := ""
+	if !e.Image.View.PortraitOnly {
+		if e.Image.Manga {
+			titleAlign = "right:0"
+		} else {
+			titleAlign = "left:0"
+		}
+	}
+
+	if !e.Image.View.PortraitOnly {
+		if err := wz.WriteContent(
+			"OEBPS/Text/space_title.xhtml",
+			[]byte(e.render(epubtemplates.Blank, map[string]any{
+				"Title":    "Blank Page Title",
+				"ViewPort": e.Image.View.Port(),
+			})),
+		); err != nil {
+			return err
+		}
+	}
+
+	if err := wz.WriteContent(
+		"OEBPS/Text/title.xhtml",
+		[]byte(e.render(epubtemplates.Text, map[string]any{
+			"Title":      title,
+			"ViewPort":   e.Image.View.Port(),
+			"ImagePath":  "Images/title.jpeg",
+			"ImageStyle": img.ImgStyle(e.Image.View.Width, e.Image.View.Height, titleAlign),
+		})),
+	); err != nil {
+		return err
+	}
+
+	coverTitle, err := e.imageProcessor.CoverTitleData(epubimageprocessor.CoverTitleDataOptions{
+		Src:         img.Raw,
+		Name:        "title",
+		Text:        title,
+		Align:       "center",
+		PctWidth:    100,
+		PctMargin:   100,
+		MaxFontSize: 64,
+		BorderSize:  4,
+	})
+	if err != nil {
+		return err
+	}
+
+	if err := wz.WriteRaw(coverTitle); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// extract image and split it into part
+func (e epub) getParts() (parts []epubPart, imgStorage epubzip.StorageImageReader, err error) {
+	images, err := e.imageProcessor.Load()
+
+	if err != nil {
+		return
+	}
+
+	// sort result by id and part
+	sort.Slice(images, func(i, j int) bool {
+		if images[i].Id == images[j].Id {
+			return images[i].Part < images[j].Part
+		}
+		return images[i].Id < images[j].Id
+	})
+
+	parts = make([]epubPart, 0)
+	cover := images[0]
+	if e.Image.HasCover || (cover.DoublePage && !e.Image.KeepDoublePageIfSplit) {
+		images = images[1:]
+	}
+
+	if e.Dry {
+		parts = append(parts, epubPart{
+			Cover:  cover,
+			Images: images,
+		})
+		return
+	}
+
+	imgStorage, err = epubzip.NewStorageImageReader(e.ImgStorage())
+	if err != nil {
+		return
+	}
+
+	// compute size of the EPUB part and try to be as close as possible of the target
+	maxSize := uint64(e.LimitMb * 1024 * 1024)
+	xhtmlSize := uint64(1024)
+	// descriptor files + title + cover
+	baseSize := uint64(128*1024) + imgStorage.Size(cover.EPUBImgPath())*2
+
+	currentSize := baseSize
+	currentImages := make([]epubimage.EPUBImage, 0)
+	part := 1
+
+	for _, img := range images {
+		imgSize := imgStorage.Size(img.EPUBImgPath()) + xhtmlSize
+		if maxSize > 0 && len(currentImages) > 0 && currentSize+imgSize > maxSize {
+			parts = append(parts, epubPart{
+				Cover:  cover,
+				Images: currentImages,
+			})
+			part += 1
+			currentSize = baseSize
+			currentImages = make([]epubimage.EPUBImage, 0)
+		}
+		currentSize += imgSize
+		currentImages = append(currentImages, img)
+	}
+	if len(currentImages) > 0 {
+		parts = append(parts, epubPart{
+			Cover:  cover,
+			Images: currentImages,
+		})
+	}
+
+	return
+}
+
+// create a tree from the directories.
+//
+// this is used to simulate the toc.
+func (e epub) getTree(images []epubimage.EPUBImage, skipFiles bool) string {
+	t := epubtree.New()
+	for _, img := range images {
+		if skipFiles {
+			t.Add(img.Path)
+		} else {
+			t.Add(filepath.Join(img.Path, img.Name))
+		}
+	}
+	c := t.Root()
+	if skipFiles && e.StripFirstDirectoryFromToc && c.ChildCount() == 1 {
+		c = c.FirstChild()
+	}
+
+	return c.WriteString("")
+}
+
+func (e epub) computeAspectRatio(epubParts []epubPart) float64 {
+	var (
+		bestAspectRatio      float64
+		bestAspectRatioCount int
+		aspectRatio          = map[float64]int{}
+	)
+
+	trunc := func(v float64) float64 {
+		return float64(math.Round(v*10000)) / 10000
+	}
+
+	for _, p := range epubParts {
+		aspectRatio[trunc(p.Cover.OriginalAspectRatio)]++
+		for _, i := range p.Images {
+			aspectRatio[trunc(i.OriginalAspectRatio)]++
+		}
+	}
+
+	for k, v := range aspectRatio {
+		if v > bestAspectRatioCount {
+			bestAspectRatio, bestAspectRatioCount = k, v
+		}
+	}
+
+	return bestAspectRatio
+}
+
+func (e epub) computeViewPort(epubParts []epubPart) (int, int) {
+	if e.Image.View.AspectRatio == -1 {
+		//keep device size
+		return e.Image.View.Width, e.Image.View.Height
+	}
+
+	// readjusting view port
+	bestAspectRatio := e.Image.View.AspectRatio
+	if bestAspectRatio == 0 {
+		bestAspectRatio = e.computeAspectRatio(epubParts)
+	}
+
+	viewWidth, viewHeight := int(float64(e.Image.View.Height)/bestAspectRatio), int(float64(e.Image.View.Width)*bestAspectRatio)
+	if viewWidth > e.Image.View.Width {
+		return e.Image.View.Width, viewHeight
+	} else {
+		return viewWidth, e.Image.View.Height
+	}
+}
+
+func (e epub) writePart(path string, currentPart, totalParts int, part epubPart, imgStorage epubzip.StorageImageReader) error {
+	hasTitlePage := e.TitlePage == 1 || (e.TitlePage == 2 && totalParts > 1)
+
+	wz, err := epubzip.New(path)
+	if err != nil {
+		return err
+	}
+	defer func(wz epubzip.EPUBZip) {
+		_ = wz.Close()
+	}(wz)
+
+	title := e.Title
+	if totalParts > 1 {
+		title = title + " [" + utils.IntToString(currentPart) + "/" + utils.IntToString(totalParts) + "]"
+	}
+
+	type zipContent struct {
+		Name    string
+		Content string
+	}
+	content := []zipContent{
+		{"META-INF/container.xml", epubtemplates.Container},
+		{"META-INF/com.apple.ibooks.display-options.xml", epubtemplates.AppleBooks},
+		{"OEBPS/content.opf", epubtemplates.Content{
+			Title:        title,
+			HasTitlePage: hasTitlePage,
+			UID:          e.UID,
+			Author:       e.Author,
+			Publisher:    e.Publisher,
+			UpdatedAt:    e.UpdatedAt,
+			ImageOptions: e.Image,
+			Cover:        part.Cover,
+			Images:       part.Images,
+			Current:      currentPart,
+			Total:        totalParts,
+		}.String()},
+		{"OEBPS/toc.xhtml", epubtemplates.Toc(title, hasTitlePage, e.StripFirstDirectoryFromToc, part.Images)},
+		{"OEBPS/Text/style.css", e.render(epubtemplates.Style, map[string]any{
+			"View": e.Image.View,
+		})},
+	}
+
+	if err = wz.WriteMagic(); err != nil {
+		return err
+	}
+	for _, c := range content {
+		if err := wz.WriteContent(c.Name, []byte(c.Content)); err != nil {
+			return err
+		}
+	}
+
+	if err = e.writeCoverImage(wz, part.Cover, currentPart, totalParts); err != nil {
+		return err
+	}
+
+	if hasTitlePage {
+		if err = e.writeTitleImage(wz, part.Cover, title); err != nil {
+			return err
+		}
+	}
+
+	lastImage := part.Images[len(part.Images)-1]
+	for _, img := range part.Images {
+		if err := e.writeImage(wz, img, imgStorage.Get(img.EPUBImgPath())); err != nil {
+			return err
+		}
+
+		// Double Page or Last Image that is not a double page
+		if !e.Image.View.PortraitOnly &&
+			(img.DoublePage ||
+				(!e.Image.KeepDoublePageIfSplit && img.Part == 1) ||
+				(img.Part == 0 && img == lastImage)) {
+			if err := e.writeBlank(wz, img); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// create the zip
+func (e epub) Write() error {
+	epubParts, imgStorage, err := e.getParts()
+	if err != nil {
+		return err
+	}
+
+	if e.Dry {
+		p := epubParts[0]
+		utils.Printf("TOC:\n  - %s\n%s\n", e.Title, e.getTree(p.Images, true))
+		if e.DryVerbose {
+			if e.Image.HasCover {
+				utils.Printf("Cover:\n%s\n", e.getTree([]epubimage.EPUBImage{p.Cover}, false))
+			}
+			utils.Printf("Files:\n%s\n", e.getTree(p.Images, false))
+		}
+		return nil
+	}
+	defer func() {
+		_ = imgStorage.Close()
+		_ = imgStorage.Remove()
+	}()
+
+	totalParts := len(epubParts)
+
+	bar := epubprogress.New(epubprogress.Options{
+		Max:         totalParts,
+		Description: "Writing Part",
+		CurrentJob:  2,
+		TotalJob:    2,
+		Quiet:       e.Quiet,
+		Json:        e.Json,
+	})
+
+	e.Image.View.Width, e.Image.View.Height = e.computeViewPort(epubParts)
+	for i, part := range epubParts {
+		ext := filepath.Ext(e.Output)
+		suffix := ""
+		if totalParts > 1 {
+			fmtLen := utils.FormatNumberOfDigits(totalParts)
+			fmtPart := "Part " + fmtLen + " of " + fmtLen
+			suffix = fmt.Sprintf(fmtPart, i+1, totalParts)
+		}
+
+		path := e.Output[0:len(e.Output)-len(ext)] + suffix + ext
+
+		if err := e.writePart(
+			path,
+			i+1,
+			totalParts,
+			part,
+			imgStorage,
+		); err != nil {
+			return err
+		}
+
+		_ = bar.Add(1)
+	}
+	_ = bar.Close()
+	if !e.Json {
+		utils.Println()
+	}
+
+	// display corrupted images
+	hasError := false
+	for pId, part := range epubParts {
+		if pId == 0 && e.Image.HasCover && part.Cover.Error != nil {
+			hasError = true
+			utils.Printf("Error on image %s: %v\n", filepath.Join(part.Cover.Path, part.Cover.Name), part.Cover.Error)
+		}
+		for _, img := range part.Images {
+			if img.Part == 0 && img.Error != nil {
+				hasError = true
+				utils.Printf("Error on image %s: %v\n", filepath.Join(img.Path, img.Name), img.Error)
+			}
+		}
+	}
+	if hasError {
+		utils.Println()
+	}
+
+	return nil
+}

pkg/epuboptions/color.go

@@ -0,0 +1,6 @@
+package epuboptions
+
+type Color struct {
+	Foreground string `yaml:"foreground" json:"foreground"`
+	Background string `yaml:"background" json:"background"`
+}

pkg/epuboptions/crop.go

@@ -0,0 +1,11 @@
+package epuboptions
+
+type Crop struct {
+	Enabled            bool `yaml:"enabled" json:"enabled"`
+	Left               int  `yaml:"left" json:"left"`
+	Up                 int  `yaml:"up" json:"up"`
+	Right              int  `yaml:"right" json:"right"`
+	Bottom             int  `yaml:"bottom" json:"bottom"`
+	Limit              int  `yaml:"limit" json:"limit"`
+	SkipIfLimitReached bool `yaml:"skip_if_limit_reached" json:"skip_if_limit_reached"`
+}

pkg/epuboptions/epub_options.go

@@ -0,0 +1,36 @@
+// Package epuboptions for EPUB creation.
+package epuboptions
+
+type EPUBOptions struct {
+	// Output
+	Input  string `yaml:"-" json:"input"`
+	Output string `yaml:"-" json:"output"`
+	Author string `yaml:"-" json:"author"`
+	Title  string `yaml:"-" json:"title"`
+
+	//Config
+	TitlePage                  int   `yaml:"title_page" json:"title_page"`
+	LimitMb                    int   `yaml:"limit_mb" json:"limit_mb"`
+	StripFirstDirectoryFromToc bool  `yaml:"strip_first_directory" json:"strip_first_directory"`
+	SortPathMode               int   `yaml:"sort_path_mode" json:"sort_path_mode"`
+	Image                      Image `yaml:"image" json:"image"`
+
+	// Other
+	Dry        bool `yaml:"-" json:"dry"`
+	DryVerbose bool `yaml:"-" json:"dry_verbose"`
+	Quiet      bool `yaml:"-" json:"-"`
+	Json       bool `yaml:"-" json:"-"`
+	Workers    int  `yaml:"-" json:"workers"`
+}
+
+func (o EPUBOptions) WorkersRatio(pct int) (nbWorkers int) {
+	nbWorkers = o.Workers * pct / 100
+	if nbWorkers < 1 {
+		nbWorkers = 1
+	}
+	return
+}
+
+func (o EPUBOptions) ImgStorage() string {
+	return o.Output + ".tmp"
+}

pkg/epuboptions/image.go

@@ -0,0 +1,22 @@
+package epuboptions
+
+type Image struct {
+	Crop                      Crop   `yaml:"crop" json:"crop"`
+	Quality                   int    `yaml:"quality" json:"quality"`
+	Brightness                int    `yaml:"brightness" json:"brightness"`
+	Contrast                  int    `yaml:"contrast" json:"contrast"`
+	AutoContrast              bool   `yaml:"auto_contrast" json:"auto_contrast"`
+	AutoRotate                bool   `yaml:"auto_rotate" json:"auto_rotate"`
+	AutoSplitDoublePage       bool   `yaml:"auto_split_double_page" json:"auto_split_double_page"`
+	KeepDoublePageIfSplit     bool   `yaml:"keep_double_page_if_split" json:"keep_double_page_if_split"`
+	KeepSplitDoublePageAspect bool   `yaml:"keep_split_double_page_aspect" json:"keep_split_double_page_aspect"`
+	NoBlankImage              bool   `yaml:"no_blank_image" json:"no_blank_image"`
+	Manga                     bool   `yaml:"manga" json:"manga"`
+	HasCover                  bool   `yaml:"has_cover" json:"has_cover"`
+	View                      View   `yaml:"view" json:"view"`
+	GrayScale                 bool   `yaml:"grayscale" json:"grayscale"`
+	GrayScaleMode             int    `yaml:"grayscale_mode" json:"gray_scale_mode"` // 0 = normal, 1 = average, 2 = luminance
+	Resize                    bool   `yaml:"resize" json:"resize"`
+	Format                    string `yaml:"format" json:"format"`
+	AppleBookCompatibility    bool   `yaml:"apple_book_compatibility" json:"apple_book_compatibility"`
+}

pkg/epuboptions/view.go

@@ -0,0 +1,21 @@
+package epuboptions
+
+import (
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/utils"
+)
+
+type View struct {
+	Width        int     `yaml:"-" json:"width"`
+	Height       int     `yaml:"-" json:"height"`
+	AspectRatio  float64 `yaml:"aspect_ratio" json:"aspect_ratio"`
+	PortraitOnly bool    `yaml:"portrait_only" json:"portrait_only"`
+	Color        Color   `yaml:"color" json:"color"`
+}
+
+func (v View) Dimension() string {
+	return utils.IntToString(v.Width) + "x" + utils.IntToString(v.Height)
+}
+
+func (v View) Port() string {
+	return "width=" + utils.IntToString(v.Width) + ",height=" + utils.IntToString(v.Height)
+}