display toc on dry mode

internal/epub/core.go

@@ -4,6 +4,7 @@ import (
 	"encoding/xml"
 	"fmt"
 	"image/color"
+	"os"
 	"path/filepath"
 	"regexp"
 	"strings"
@@ -11,6 +12,7 @@ import (
 	"time"
 
 	"github.com/gofrs/uuid"
+	"gopkg.in/yaml.v3"
 )
 
 type ImageOptions struct {
@@ -38,6 +40,7 @@ type EpubOptions struct {
 	Author                     string
 	LimitMb                    int
 	StripFirstDirectoryFromToc bool
+	Dry                        bool
 
 	*ImageOptions
 }
@@ -93,7 +96,7 @@ func (e *ePub) render(templateString string, data any) string {
 }
 
 func (e *ePub) getParts() ([]*epubPart, error) {
-	images, err := LoadImages(e.Input, e.ImageOptions)
+	images, err := LoadImages(e.Input, e.ImageOptions, e.Dry)
 
 	if err != nil {
 		return nil, err
@@ -104,6 +107,15 @@ func (e *ePub) getParts() ([]*epubPart, error) {
 	if e.HasCover {
 		images = images[1:]
 	}
+
+	if e.Dry {
+		parts = append(parts, &epubPart{
+			Cover:  cover,
+			Images: images,
+		})
+		return parts, nil
+	}
+
 	maxSize := uint64(e.LimitMb * 1024 * 1024)
 
 	xhtmlSize := uint64(1024)
@@ -142,7 +154,7 @@ func (e *ePub) getParts() ([]*epubPart, error) {
 	return parts, nil
 }
 
-func (e *ePub) getToc(title string, images []*Image) ([]byte, error) {
+func (e *ePub) getToc(images []*Image) *TocChildren {
 	paths := map[string]*TocPart{
 		".": {},
 	}
@@ -174,11 +186,8 @@ func (e *ePub) getToc(title string, images []*Image) ([]byte, error) {
 		children = children.Tags[0].Children
 	}
 
-	if children == nil {
+	return children
-		return []byte{}, nil
-	}
 
-	return xml.MarshalIndent(children.Tags, "        ", "  ")
 }
 
 func (e *ePub) Write() error {
@@ -191,6 +200,16 @@ func (e *ePub) Write() error {
 	if err != nil {
 		return err
 	}
+
+	if e.Dry {
+		tocChildren := e.getToc(epubParts[0].Images)
+		fmt.Fprintf(os.Stderr, "TOC:\n- %s\n", e.Title)
+		if tocChildren != nil {
+			yaml.NewEncoder(os.Stderr).Encode(tocChildren)
+		}
+		return nil
+	}
+
 	totalParts := len(epubParts)
 
 	bar := NewBar(totalParts, "Writing Part", 2, 2)
@@ -212,10 +231,15 @@ func (e *ePub) Write() error {
 		if totalParts > 1 {
 			title = fmt.Sprintf("%s [%d/%d]", title, i+1, totalParts)
 		}
-		toc, err := e.getToc(title, part.Images)
+
+		tocChildren := e.getToc(part.Images)
+		toc := []byte{}
+		if tocChildren != nil {
+			toc, err = xml.MarshalIndent(tocChildren.Tags, "        ", "  ")
 			if err != nil {
 				return err
 			}
+		}
 
 		content := []zipContent{
 			{"META-INF/container.xml", containerTmpl},

internal/epub/image_processing.go

@@ -92,7 +92,7 @@ BOTTOM:
 	return imgArea
 }
 
-func LoadImages(path string, options *ImageOptions) ([]*Image, error) {
+func LoadImages(path string, options *ImageOptions, dry bool) ([]*Image, error) {
 	images := make([]*Image, 0)
 
 	fi, err := os.Stat(path)
@@ -123,6 +123,22 @@ func LoadImages(path string, options *ImageOptions) ([]*Image, error) {
 		return nil, err
 	}
 
+	if dry {
+		for img := range imageInput {
+			images = append(images, &Image{
+				img.Id,
+				0,
+				nil,
+				0,
+				0,
+				false,
+				false, // NeedSpace reajust during parts computation
+				img.Path,
+			})
+		}
+		return images, nil
+	}
+
 	imageOutput := make(chan *Image)
 
 	// processing

internal/epub/toc.go

@@ -1,6 +1,8 @@
 package epub
 
-import "encoding/xml"
+import (
+	"encoding/xml"
+)
 
 type TocTitle struct {
 	XMLName xml.Name `xml:"a"`
@@ -13,8 +15,20 @@ type TocChildren struct {
 	Tags    []*TocPart
 }
 
+func (t *TocChildren) MarshalYAML() (any, error) {
+	return t.Tags, nil
+}
+
 type TocPart struct {
 	XMLName  xml.Name `xml:"li"`
 	Title    TocTitle
 	Children *TocChildren `xml:",omitempty"`
 }
+
+func (t *TocPart) MarshalYAML() (any, error) {
+	if t.Children == nil {
+		return t.Title.Value, nil
+	} else {
+		return map[string]any{t.Title.Value: t.Children}, nil
+	}
+}

main.go

@@ -90,10 +90,6 @@ $ go install github.com/celogeek/go-comic-converter/v%d@%s
 
 	fmt.Fprintln(os.Stderr, cmd.Options)
 
-	if cmd.Options.Dry {
-		return
-	}
-
 	profile := cmd.Options.GetProfile()
 	if err := epub.NewEpub(&epub.EpubOptions{
 		Input:                      cmd.Options.Input,
@@ -102,6 +98,7 @@ $ go install github.com/celogeek/go-comic-converter/v%d@%s
 		Title:                      cmd.Options.Title,
 		Author:                     cmd.Options.Author,
 		StripFirstDirectoryFromToc: cmd.Options.StripFirstDirectoryFromToc,
+		Dry:                        cmd.Options.Dry,
 		ImageOptions: &epub.ImageOptions{
 			ViewWidth:           profile.Width,
 			ViewHeight:          profile.Height,