.final

backend/fileicon_darwin.go

@@ -0,0 +1,45 @@
+//go:build darwin
+
+package backend
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func SetMacOSFileIconFromImage(filePath, imagePath string, iconSize int) error {
+	if filePath == "" {
+		return fmt.Errorf("file path is required")
+	}
+	if imagePath == "" {
+		return fmt.Errorf("image path is required")
+	}
+
+	resizedPath, err := ResizeImageForIcon(imagePath, iconSize)
+	if err != nil {
+		return err
+	}
+	defer os.Remove(resizedPath)
+
+	script := `
+use framework "AppKit"
+on run argv
+    set imagePath to item 1 of argv
+    set targetPath to item 2 of argv
+    set iconImage to current application's NSImage's alloc()'s initWithContentsOfFile:imagePath
+    if iconImage is missing value then error "Failed to load icon image"
+    set didSet to (current application's NSWorkspace's sharedWorkspace()'s setIcon:iconImage forFile:targetPath options:0) as boolean
+    if didSet is false then error "Failed to set custom file icon"
+end run
+`
+
+	cmd := exec.Command("osascript", "-", resizedPath, filePath)
+	cmd.Stdin = strings.NewReader(script)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("failed to apply macOS file icon: %v (%s)", err, strings.TrimSpace(string(output)))
+	}
+	return nil
+}