app-init

tools/mkico/main.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"encoding/binary"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// mkico packs internal/gui/logo.png into a single-image ICO at cmd/tunnel/app.ico.
+// Prefer replacing app.ico with a proper multi-size .ico from a designer tool;
+// this helper is a quick path when you only have a PNG.
+func main() {
+	root, err := findRoot()
+	if err != nil {
+		panic(err)
+	}
+	pngPath := filepath.Join(root, "internal", "gui", "logo.png")
+	icoPath := filepath.Join(root, "cmd", "tunnel", "app.ico")
+
+	png, err := os.ReadFile(pngPath)
+	if err != nil {
+		panic(err)
+	}
+	var w, h uint32
+	if len(png) >= 24 {
+		w = binary.BigEndian.Uint32(png[16:20])
+		h = binary.BigEndian.Uint32(png[20:24])
+	}
+	wb, hb := byte(w), byte(h)
+	if w >= 256 {
+		wb = 0
+	}
+	if h >= 256 {
+		hb = 0
+	}
+	out := make([]byte, 22+len(png))
+	binary.LittleEndian.PutUint16(out[2:], 1)
+	binary.LittleEndian.PutUint16(out[4:], 1)
+	out[6] = wb
+	out[7] = hb
+	binary.LittleEndian.PutUint16(out[10:], 1)
+	binary.LittleEndian.PutUint16(out[12:], 32)
+	binary.LittleEndian.PutUint32(out[14:], uint32(len(png)))
+	binary.LittleEndian.PutUint32(out[18:], 22)
+	copy(out[22:], png)
+	if err := os.WriteFile(icoPath, out, 0o644); err != nil {
+		panic(err)
+	}
+	fmt.Println("wrote", icoPath)
+}
+
+func findRoot() (string, error) {
+	wd, err := os.Getwd()
+	if err != nil {
+		return "", err
+	}
+	dir := wd
+	for {
+		if _, err := os.Stat(filepath.Join(dir, "go.mod")); err == nil {
+			return dir, nil
+		}
+		parent := filepath.Dir(dir)
+		if parent == dir {
+			return "", fmt.Errorf("go.mod not found from %s", wd)
+		}
+		dir = parent
+	}
+}