fix: print errors to stderr and exit code 1

Signed-off-by: jolheiser <john.olheiser@gmail.com>

imp.go

@@ -49,7 +49,7 @@ func runImp(root, ignore string, write, gofumpt, gofumptExtra bool) error {
 		}
 
 		formatted, err := impFormat(data, mod, gofumpt, gofumptExtra)
-		if err != nil {
+		if err != nil && !errors.Is(err, format.ErrNoImports) {
 			return fmt.Errorf("could not format file %q: %w", walkPath, err)
 		}
 

main.go

@@ -12,6 +12,13 @@ import (
 var Version = "develop"
 
 func main() {
+	if err := mainErr(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+func mainErr() error {
 	fs := flag.NewFlagSet("imp", flag.ExitOnError)
 	writeFlag := fs.Bool("write", false, "Write the re-ordered imports instead of just printing them")
 	fs.BoolVar(writeFlag, "w", *writeFlag, "--write")
@@ -28,17 +35,15 @@ func main() {
 	if *stdinFlag {
 		mod, err := modInfo()
 		if err != nil {
-			fmt.Println(err)
-			return
+			return err
 		}
 		src, err := io.ReadAll(os.Stdin)
 		if err != nil {
-			fmt.Println(err)
-			return
+			return err
 		}
 		formatted, err := impFormat(src, mod, *gofumptFlag, *gofumptExtraFlag)
 		if err != nil {
-			fmt.Println(err)
+			return err
 		}
 		fmt.Print(string(formatted))
 	}
@@ -48,9 +53,7 @@ func main() {
 		root = fs.Arg(0)
 	}
 
-	if err := runImp(root, *ignoreFlag, *writeFlag, *gofumptFlag, *gofumptExtraFlag); err != nil {
-		fmt.Println(err)
-	}
+	return runImp(root, *ignoreFlag, *writeFlag, *gofumptFlag, *gofumptExtraFlag)
 }
 
 type module struct {