add overwrite arg

main.go

@@ -33,7 +33,10 @@ func usage() {
 func main() {
 	go func() {
 		if r := recover(); r != nil {
-			fmt.Fprintln(os.Stderr, "E: ", r)
+			_, err := fmt.Fprintln(os.Stderr, "E: ", r)
+			if err != nil {
+				os.Exit(-255)
+			}
 			os.Exit(-1)
 		}
 	}()
@@ -43,6 +46,7 @@ func main() {
 	jpegQuality := flag.Int("q", jpeg.DefaultQuality, "Define the jpeg quality")
 	ignoreErr := flag.Bool("ignore-errors", false, "Continue to convert when the converter encounter an error")
 	removeOrig := flag.Bool("remove-original", false, "Remove the heic file after conversion")
+	overwriteOut := flag.Bool("overwrite", false, "Overwrite file if already exists")
 	outPath := flag.String("o", "", "Output directory")
 	flag.Parse()
 
@@ -54,15 +58,22 @@ func main() {
 	var files []string
 	if len(*dir) == 0 {
 		if len(os.Args) == 1 {
-			fmt.Fprintln(os.Stderr, "E: Missing file path")
+			_, err := fmt.Fprintln(os.Stderr, "E: Missing file path")
+			if err != nil {
+				panic(err)
+			}
 			os.Exit(-1)
 		}
 		files = append(files, os.Args[len(os.Args)-1])
 	} else {
+		fmt.Printf("Analyzing folder %s\n", *dir)
 		var err error
 		files, err = getHEICFiles(*dir, *recursive)
 		if err != nil {
-			fmt.Fprintf(os.Stderr, "E: Failed to analyse directory: %v\n", err)
+			_, err := fmt.Fprintf(os.Stderr, "E: Failed to analyse directory: %v\n", err)
+			if err != nil {
+				panic(err)
+			}
 			os.Exit(-1)
 		}
 	}
@@ -79,19 +90,22 @@ func main() {
 
 	if askForConfirmation("Do you want to start the conversion?") {
 		out := *dir
-		overwritePath := false
+		rewritePath := false
 		if len(*outPath) > 0 {
 			out = *outPath
-			overwritePath = true
+			rewritePath = true
 		}
 		start := time.Now()
-		converted := convert(out, files, *ignoreErr, *jpegQuality, overwritePath)
+		converted := convert(out, files, *ignoreErr, *jpegQuality, rewritePath, *overwriteOut)
 
 		if *removeOrig {
 			for _, file := range converted {
 				err := os.Remove(file)
 				if err != nil {
-					fmt.Fprintf(os.Stderr, "E: Failed to remove %s: %v\n", file, err)
+					_, err := fmt.Fprintf(os.Stderr, "E: Failed to remove %s: %v\n", file, err)
+					if err != nil {
+						panic(err)
+					}
 				}
 			}
 		}
@@ -140,7 +154,7 @@ func isHEIC(f filer) bool {
 	return !f.IsDir() && strings.HasSuffix(f.Name(), ".heic")
 }
 
-func convert(out string, files []string, ignoreErr bool, jpegQuality int, overwritePath bool) []string {
+func convert(out string, files []string, ignoreErr bool, jpegQuality int, rewritePath, overwrite bool) []string {
 	var success []string
 	wg := new(sync.WaitGroup)
 	chunk := chunkWork(files)
@@ -148,60 +162,103 @@ func convert(out string, files []string, ignoreErr bool, jpegQuality int, overwr
 		wg.Add(1)
 		go func(files []string, wg *sync.WaitGroup) {
 			for _, file := range files {
+				// Generate new path
+				fout := strings.TrimSuffix(file, ".heic") + ".jpg"
+				if rewritePath {
+					fout = filepath.Join(out, filepath.Base(fout))
+				}
+
+				// Ignore if file exists and overwirte arg not true
+				if !overwrite {
+					if _, err := os.Stat(fout); err == nil {
+						continue
+					}
+				}
+
+				// Open source file
 				fi, err := os.Open(file)
 				if err != nil {
-					fmt.Fprintf(os.Stderr, "E: Failed to open %s: %v\n", file, err)
+					_, err := fmt.Fprintf(os.Stderr, "E: Failed to open %s: %v\n", file, err)
+					if err != nil {
+						panic(err)
+					}
 					if ignoreErr {
 						continue
 					}
 					os.Exit(-1)
 				}
 
+				// Extract exif
 				ex, err := goheif.ExtractExif(fi)
 				if err != nil {
 					fmt.Printf("W: no EXIF from %s: %v\n", file, err)
 				}
 
+				// Parse jpg to bitmap
 				img, err := goheif.Decode(fi)
 				if err != nil {
-					fi.Close()
+					err := fi.Close()
-					fmt.Fprintf(os.Stderr, "E: Failed to decode %s: %v\n", file, err)
+					if err != nil {
+						panic(err)
+					}
+					_, err = fmt.Fprintf(os.Stderr, "E: Failed to decode %s: %v\n", file, err)
+					if err != nil {
+						panic(err)
+					}
 					if ignoreErr {
 						continue
 					}
 					os.Exit(-1)
 				}
 
-				fout := strings.TrimSuffix(file, ".heic") + ".jpg"
+				// Open out file
-				if overwritePath {
-					fout = filepath.Join(out, filepath.Base(fout))
-				}
-
 				fo, err := os.OpenFile(fout, os.O_RDWR|os.O_CREATE, 0644)
 				if err != nil {
-					fi.Close()
+					err := fi.Close()
-					fmt.Fprintf(os.Stderr, "E: Failed to create output file %s: %v\n", fout, err)
+					if err != nil {
+						panic(err)
+					}
+					_, err = fmt.Fprintf(os.Stderr, "E: Failed to create output file %s: %v\n", fout, err)
+					if err != nil {
+						panic(err)
+					}
 					if ignoreErr {
 						continue
 					}
 					os.Exit(-1)
 				}
 
+				// Convert and write to jpg file
 				w, _ := exif.NewWriterExif(fo, ex)
 				err = jpeg.Encode(w, img, &jpeg.Options{
 					Quality: jpegQuality,
 				})
 				if err != nil {
-					fi.Close()
+					err := fi.Close()
-					fo.Close()
+					if err != nil {
-					fmt.Fprintf(os.Stderr, "E: Failed to encode %s: %v\n", fout, err)
+						panic(err)
+					}
+					err = fo.Close()
+					if err != nil {
+						panic(err)
+					}
+					_, err = fmt.Fprintf(os.Stderr, "E: Failed to encode %s: %v\n", fout, err)
+					if err != nil {
+						panic(err)
+					}
 					if ignoreErr {
 						continue
 					}
 					os.Exit(-1)
 				}
-				fi.Close()
+				err = fi.Close()
-				fo.Close()
+				if err != nil {
+					panic(err)
+				}
+				err = fo.Close()
+				if err != nil {
+					panic(err)
+				}
 				success = append(success, file)
 			}
 			wg.Done()
@@ -228,9 +285,7 @@ func chunkWork(files []string) [][]string {
 
 func askForConfirmation(s string) bool {
 	reader := bufio.NewReader(os.Stdin)
-
+	fmt.Printf("%s [y/N]: ", s)
-	for {
-		fmt.Printf("%s [y/n]: ", s)
 
 	response, err := reader.ReadString('\n')
 	if err != nil {
@@ -241,8 +296,6 @@ func askForConfirmation(s string) bool {
 
 	if response == "y" || response == "yes" {
 		return true
-		} else if response == "n" || response == "no" {
+	}
 	return false
 }
-	}
-}