init project

Makefile

@@ -0,0 +1,3 @@
+build:
+	go build -o imgcat
+all: build

README.md

@@ -0,0 +1 @@
+# imgcat

go.mod

@@ -0,0 +1,3 @@
+module gitlab.celogeek.com/imgcat
+
+go 1.17

main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"encoding/base64"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+)
+
+type Options struct {
+	url    string
+	height int
+}
+
+func PrintHeader(size int64, height int) {
+	fmt.Printf("\033]1337")
+	fmt.Printf(";File=")
+	fmt.Printf(";inline=1")
+	fmt.Printf(";size=%d;", size)
+	if height > 0 {
+		fmt.Printf(";height=%d", height)
+	}
+	fmt.Printf(":")
+}
+
+func PrintFooter() {
+	fmt.Println("\a")
+}
+
+func PrintImg(img io.ReadCloser) {
+	encoder := base64.NewEncoder(base64.StdEncoding, os.Stdout)
+	defer img.Close()
+	defer encoder.Close()
+	buf := make([]byte, 8192)
+	for {
+		n, err := img.Read(buf)
+		if err == io.EOF {
+			break
+		}
+		encoder.Write(buf[:n])
+	}
+}
+
+func main() {
+	var opts = &Options{}
+	flag.StringVar(&opts.url, "url", "", "url of the jpg")
+	flag.IntVar(&opts.height, "height", 0, "maximum height in lines")
+	flag.Parse()
+
+	if !(strings.HasPrefix(opts.url, "http://") || strings.HasPrefix(opts.url, "https://")) {
+		log.Fatalln("url doesn't start with http")
+	}
+
+	resp, err := http.Get(opts.url)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	if resp.StatusCode != 200 {
+		log.Fatalln(fmt.Sprintf("Issue to get img, status = %d", resp.StatusCode))
+	}
+
+	PrintHeader(resp.ContentLength, opts.height)
+	PrintImg(resp.Body)
+	PrintFooter()
+}