Canceled error.

cmd/zenity/main.go

@@ -100,27 +100,27 @@ func main() {
 
 	switch {
 	case errorDlg:
-		okResult(zenity.Error(text, opts...))
+		errResult(zenity.Error(text, opts...))
 	case infoDlg:
-		okResult(zenity.Info(text, opts...))
+		errResult(zenity.Info(text, opts...))
 	case warningDlg:
-		okResult(zenity.Warning(text, opts...))
+		errResult(zenity.Warning(text, opts...))
 	case questionDlg:
-		okResult(zenity.Question(text, opts...))
+		errResult(zenity.Question(text, opts...))
 
 	case entryDlg:
-		strOKResult(zenity.Entry(text, opts...))
+		strResult(zenity.Entry(text, opts...))
 
 	case listDlg:
 		if multiple {
-			listResult(zenity.ListMultiple(text, flag.Args(), opts...))
+			lstResult(zenity.ListMultiple(text, flag.Args(), opts...))
 		} else {
-			strOKResult(zenity.List(text, flag.Args(), opts...))
+			strResult(zenity.List(text, flag.Args(), opts...))
 		}
 
 	case passwordDlg:
-		_, pw, ok, err := zenity.Password(opts...)
+		_, pw, err := zenity.Password(opts...)
-		strOKResult(pw, ok, err)
+		strResult(pw, err)
 
 	case fileSelectionDlg:
 		switch {
@@ -129,11 +129,11 @@ func main() {
 		case save:
 			strResult(egestPath(zenity.SelectFileSave(opts...)))
 		case multiple:
-			listResult(egestPaths(zenity.SelectFileMutiple(opts...)))
+			lstResult(egestPaths(zenity.SelectFileMutiple(opts...)))
 		}
 
 	case colorSelectionDlg:
-		colorResult(zenity.SelectColor(opts...))
+		colResult(zenity.SelectColor(opts...))
 
 	case notification:
 		errResult(zenity.Notify(text, opts...))
@@ -395,6 +395,9 @@ func errResult(err error) {
 	if os.IsTimeout(err) {
 		os.Exit(5)
 	}
+	if err == zenity.ErrCanceled {
+		os.Exit(1)
+	}
 	if err == zenity.ErrExtraButton {
 		os.Stdout.WriteString(extraButton)
 		os.Stdout.WriteString(zenutil.LineBreak)
@@ -408,64 +411,33 @@ func errResult(err error) {
 	os.Exit(0)
 }
 
-func okResult(ok bool, err error) {
-	if err != nil {
-		errResult(err)
-	}
-	if ok {
-		os.Exit(0)
-	}
-	os.Exit(1)
-}
-
 func strResult(s string, err error) {
 	if err != nil {
 		errResult(err)
 	}
-	if s == "" {
-		os.Exit(1)
-	}
 	os.Stdout.WriteString(s)
 	os.Stdout.WriteString(zenutil.LineBreak)
 	os.Exit(0)
 }
 
-func listResult(l []string, err error) {
+func lstResult(l []string, err error) {
 	if err != nil {
 		errResult(err)
 	}
-	if l == nil {
-		os.Exit(1)
-	}
 	os.Stdout.WriteString(strings.Join(l, zenutil.Separator))
 	os.Stdout.WriteString(zenutil.LineBreak)
 	os.Exit(0)
 }
 
-func colorResult(c color.Color, err error) {
+func colResult(c color.Color, err error) {
 	if err != nil {
 		errResult(err)
 	}
-	if c == nil {
-		os.Exit(1)
-	}
 	os.Stdout.WriteString(zenutil.UnparseColor(c))
 	os.Stdout.WriteString(zenutil.LineBreak)
 	os.Exit(0)
 }
 
-func strOKResult(s string, ok bool, err error) {
-	if err != nil {
-		errResult(err)
-	}
-	if !ok {
-		os.Exit(1)
-	}
-	os.Stdout.WriteString(s)
-	os.Stdout.WriteString(zenutil.LineBreak)
-	os.Exit(0)
-}
-
 func ingestPath(path string) string {
 	if runtime.GOOS == "windows" && path != "" {
 		var args []string

color.go

@@ -4,8 +4,6 @@ import "image/color"
 
 // SelectColor displays the color selection dialog.
 //
-// Returns nil on cancel.
-//
 // Valid options: Title, Color, ShowPalette.
 func SelectColor(options ...Option) (color.Color, error) {
 	return selectColor(applyOptions(options))

color_darwin.go

@@ -20,9 +20,9 @@ func selectColor(opts options) (color.Color, error) {
 		float32(g) / 0xffff,
 		float32(b) / 0xffff,
 	})
-	str, ok, err := strResult(opts, out, err)
+	str, err := strResult(opts, out, err)
-	if ok {
+	if err != nil {
-		return zenutil.ParseColor(str), nil
-	}
 		return nil, err
 	}
+	return zenutil.ParseColor(str), nil
+}

color_unix.go

@@ -20,9 +20,9 @@ func selectColor(opts options) (color.Color, error) {
 	}
 
 	out, err := zenutil.Run(opts.ctx, args)
-	str, ok, err := strResult(opts, out, err)
+	str, err := strResult(opts, out, err)
-	if ok {
+	if err != nil {
-		return zenutil.ParseColor(str), nil
-	}
 		return nil, err
 	}
+	return zenutil.ParseColor(str), nil
+}

entry.go

@@ -2,11 +2,9 @@ package zenity
 
 // Entry displays the text entry dialog.
 //
-// Returns false on cancel, or ErrExtraButton.
-//
 // Valid options: Title, Width, Height, OKLabel, CancelLabel, ExtraButton,
 // Icon, EntryText, HideText.
-func Entry(text string, options ...Option) (string, bool, error) {
+func Entry(text string, options ...Option) (string, error) {
 	return entry(text, applyOptions(options))
 }
 

entry_darwin.go

@@ -4,7 +4,7 @@ import (
 	"github.com/ncruces/zenity/internal/zenutil"
 )
 
-func entry(text string, opts options) (string, bool, error) {
+func entry(text string, opts options) (string, error) {
 	var data zenutil.Dialog
 	data.Text = text
 	data.Operation = "displayDialog"

entry_test.go

@@ -19,7 +19,7 @@ func ExampleEntry() {
 func TestEntryTimeout(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second/10)
 
-	_, _, err := zenity.Entry("", zenity.Context(ctx))
+	_, err := zenity.Entry("", zenity.Context(ctx))
 	if !os.IsTimeout(err) {
 		t.Error("did not timeout:", err)
 	}
@@ -31,7 +31,7 @@ func TestEntryCancel(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	cancel()
 
-	_, _, err := zenity.Entry("", zenity.Context(ctx))
+	_, err := zenity.Entry("", zenity.Context(ctx))
 	if !errors.Is(err, context.Canceled) {
 		t.Error("was not canceled:", err)
 	}

entry_unix.go

@@ -6,7 +6,7 @@ import (
 	"github.com/ncruces/zenity/internal/zenutil"
 )
 
-func entry(text string, opts options) (string, bool, error) {
+func entry(text string, opts options) (string, error) {
 	args := []string{"--entry", "--text", text}
 	args = appendTitle(args, opts)
 	args = appendButtons(args, opts)

entry_windows.go

@@ -4,7 +4,7 @@ import (
 	"syscall"
 )
 
-func entry(text string, opts options) (out string, ok bool, err error) {
+func entry(text string, opts options) (out string, err error) {
 	if opts.title == nil {
 		opts.title = stringPtr("")
 	}
@@ -49,6 +49,7 @@ func entry(text string, opts options) (out string, ok bool, err error) {
 			postQuitMessage.Call(0)
 
 		case 0x0010: // WM_CLOSE
+			err = ErrCanceled
 			destroyWindow.Call(wnd)
 
 		case 0x0111: // WM_COMMAND
@@ -57,8 +58,8 @@ func entry(text string, opts options) (out string, ok bool, err error) {
 				return 1
 			case 1, 6: // IDOK, IDYES
 				out = getWindowString(editCtl)
-				ok = true
 			case 2: // IDCANCEL
+				err = ErrCanceled
 			case 7: // IDNO
 				err = ErrExtraButton
 			}
@@ -76,17 +77,17 @@ func entry(text string, opts options) (out string, ok bool, err error) {
 	}
 
 	if opts.ctx != nil && opts.ctx.Err() != nil {
-		return "", false, opts.ctx.Err()
+		return "", opts.ctx.Err()
 	}
 
 	instance, _, err := getModuleHandle.Call(0)
 	if instance == 0 {
-		return "", false, err
+		return "", err
 	}
 
 	cls, err := registerClass(instance, syscall.NewCallback(proc))
 	if cls == 0 {
-		return "", false, err
+		return "", err
 	}
 	defer unregisterClass.Call(cls, instance)
 
@@ -145,13 +146,13 @@ func entry(text string, opts options) (out string, ok bool, err error) {
 	}
 
 	// set default values
-	out, ok, err = "", false, nil
+	out, err = "", nil
 
 	if err := messageLoop(wnd); err != nil {
-		return "", false, err
+		return "", err
 	}
 	if opts.ctx != nil && opts.ctx.Err() != nil {
-		return "", false, opts.ctx.Err()
+		return "", opts.ctx.Err()
 	}
-	return out, ok, err
+	return out, err
 }

file.go

@@ -8,8 +8,6 @@ import (
 
 // SelectFile displays the file selection dialog.
 //
-// Returns an empty string on cancel.
-//
 // Valid options: Title, Directory, Filename, ShowHidden, FileFilter(s).
 func SelectFile(options ...Option) (string, error) {
 	return selectFile(applyOptions(options))
@@ -17,8 +15,6 @@ func SelectFile(options ...Option) (string, error) {
 
 // SelectFileMutiple displays the multiple file selection dialog.
 //
-// Returns a nil slice on cancel.
-//
 // Valid options: Title, Directory, Filename, ShowHidden, FileFilter(s).
 func SelectFileMutiple(options ...Option) ([]string, error) {
 	return selectFileMutiple(applyOptions(options))
@@ -26,8 +22,6 @@ func SelectFileMutiple(options ...Option) ([]string, error) {
 
 // SelectFileSave displays the save file selection dialog.
 //
-// Returns an empty string on cancel.
-//
 // Valid options: Title, Filename, ConfirmOverwrite, ConfirmCreate, ShowHidden,
 // FileFilter(s).
 func SelectFileSave(options ...Option) (string, error) {

file_darwin.go

@@ -18,8 +18,7 @@ func selectFile(opts options) (string, error) {
 	}
 
 	out, err := zenutil.Run(opts.ctx, "file", data)
-	str, _, err := strResult(opts, out, err)
+	return strResult(opts, out, err)
-	return str, err
 }
 
 func selectFileMutiple(opts options) ([]string, error) {
@@ -54,6 +53,5 @@ func selectFileSave(opts options) (string, error) {
 	}
 
 	out, err := zenutil.Run(opts.ctx, "file", data)
-	str, _, err := strResult(opts, out, err)
+	return strResult(opts, out, err)
-	return str, err
 }

file_unix.go

@@ -14,8 +14,7 @@ func selectFile(opts options) (string, error) {
 	args = appendFileArgs(args, opts)
 
 	out, err := zenutil.Run(opts.ctx, args)
-	str, _, err := strResult(opts, out, err)
+	return strResult(opts, out, err)
-	return str, err
 }
 
 func selectFileMutiple(opts options) ([]string, error) {
@@ -33,8 +32,7 @@ func selectFileSave(opts options) (string, error) {
 	args = appendFileArgs(args, opts)
 
 	out, err := zenutil.Run(opts.ctx, args)
-	str, _, err := strResult(opts, out, err)
+	return strResult(opts, out, err)
-	return str, err
 }
 
 func initFilters(filters []FileFilter) []string {

file_windows.go

@@ -251,7 +251,7 @@ func pickFolders(opts options, multi bool) (str string, lst []string, err error)
 		return "", nil, opts.ctx.Err()
 	}
 	if hr == 0x800704c7 { // ERROR_CANCELLED
-		return "", nil, nil
+		return "", nil, ErrCanceled
 	}
 	if int32(hr) < 0 {
 		return "", nil, syscall.Errno(hr)
@@ -335,7 +335,7 @@ func browseForFolder(opts options) (string, []string, error) {
 		return "", nil, opts.ctx.Err()
 	}
 	if ptr == 0 {
-		return "", nil, nil
+		return "", nil, ErrCanceled
 	}
 	defer coTaskMemFree.Call(ptr)
 

internal/zenutil/run_darwin.go

@@ -51,7 +51,7 @@ func Run(ctx context.Context, script string, data interface{}) ([]byte, error) {
 }
 
 // RunProgress is internal.
-func RunProgress(ctx context.Context, max int, env []string) (m *progressDialog, err error) {
+func RunProgress(ctx context.Context, max int, env []string) (*progressDialog, error) {
 	t, err := ioutil.TempDir("", "")
 	if err != nil {
 		return nil, err
@@ -98,14 +98,14 @@ func RunProgress(ctx context.Context, max int, env []string) (m *progressDialog,
 	if err != nil {
 		return nil, err
 	}
-	if err = cmd.Start(); err != nil {
+	if err := cmd.Start(); err != nil {
 		return nil, err
 	}
 	if ctx == nil {
 		ctx = context.Background()
 	}
 
-	m = &progressDialog{
+	dlg := &progressDialog{
 		done:  make(chan struct{}),
 		lines: make(chan string),
 		max:   max,
@@ -115,8 +115,8 @@ func RunProgress(ctx context.Context, max int, env []string) (m *progressDialog,
 		if cerr := ctx.Err(); cerr != nil {
 			err = cerr
 		}
-		m.err = err
+		dlg.err = err
-		close(m.done)
+		close(dlg.done)
 		os.RemoveAll(t)
 	}()
 	go func() {
@@ -124,7 +124,7 @@ func RunProgress(ctx context.Context, max int, env []string) (m *progressDialog,
 		for {
 			var line string
 			select {
-			case s, ok := <-m.lines:
+			case s, ok := <-dlg.lines:
 				if !ok {
 					return
 				}
@@ -138,7 +138,7 @@ func RunProgress(ctx context.Context, max int, env []string) (m *progressDialog,
 			}
 		}
 	}()
-	return
+	return dlg, nil
 }
 
 // Dialog is internal.

internal/zenutil/run_progress.go

@@ -14,37 +14,37 @@ type progressDialog struct {
 	max     int
 }
 
-func (m *progressDialog) send(line string) error {
+func (d *progressDialog) send(line string) error {
 	select {
-	case m.lines <- line:
+	case d.lines <- line:
 		return nil
-	case <-m.done:
+	case <-d.done:
-		return m.err
+		return d.err
 	}
 }
 
-func (m *progressDialog) Close() error {
+func (d *progressDialog) Close() error {
-	close(m.lines)
+	close(d.lines)
-	<-m.done
+	<-d.done
-	return m.err
+	return d.err
 }
 
-func (m *progressDialog) Text(text string) error {
+func (d *progressDialog) Text(text string) error {
-	return m.send("#" + text)
+	return d.send("#" + text)
 }
 
-func (m *progressDialog) Value(value int) error {
+func (d *progressDialog) Value(value int) error {
-	if m.percent {
+	if d.percent {
-		return m.send(strconv.FormatFloat(100*float64(value)/float64(m.max), 'f', -1, 64))
+		return d.send(strconv.FormatFloat(100*float64(value)/float64(d.max), 'f', -1, 64))
 	} else {
-		return m.send(strconv.Itoa(value))
+		return d.send(strconv.Itoa(value))
 	}
 }
 
-func (m *progressDialog) MaxValue() int {
+func (d *progressDialog) MaxValue() int {
-	return m.max
+	return d.max
 }
 
-func (m *progressDialog) Done() <-chan struct{} {
+func (d *progressDialog) Done() <-chan struct{} {
-	return m.done
+	return d.done
 }

internal/zenutil/run_unix.go

@@ -42,7 +42,7 @@ func Run(ctx context.Context, args []string) ([]byte, error) {
 }
 
 // RunProgress is internal.
-func RunProgress(ctx context.Context, max int, args []string) (m *progressDialog, err error) {
+func RunProgress(ctx context.Context, max int, args []string) (*progressDialog, error) {
 	if Command && path != "" {
 		if Timeout > 0 {
 			args = append(args, "--timeout", strconv.Itoa(Timeout))
@@ -55,14 +55,14 @@ func RunProgress(ctx context.Context, max int, args []string) (m *progressDialog
 	if err != nil {
 		return nil, err
 	}
-	if err = cmd.Start(); err != nil {
+	if err := cmd.Start(); err != nil {
 		return nil, err
 	}
 	if ctx == nil {
 		ctx = context.Background()
 	}
 
-	m = &progressDialog{
+	dlg := &progressDialog{
 		done:    make(chan struct{}),
 		lines:   make(chan string),
 		percent: true,
@@ -71,7 +71,7 @@ func RunProgress(ctx context.Context, max int, args []string) (m *progressDialog
 	go func() {
 		err := cmd.Wait()
 		select {
-		case _, ok := <-m.lines:
+		case _, ok := <-dlg.lines:
 			if !ok {
 				err = nil
 			}
@@ -80,15 +80,15 @@ func RunProgress(ctx context.Context, max int, args []string) (m *progressDialog
 		if cerr := ctx.Err(); cerr != nil {
 			err = cerr
 		}
-		m.err = err
+		dlg.err = err
-		close(m.done)
+		close(dlg.done)
 	}()
 	go func() {
 		defer cmd.Process.Signal(syscall.SIGTERM)
 		for {
 			var line string
 			select {
-			case s, ok := <-m.lines:
+			case s, ok := <-dlg.lines:
 				if !ok {
 					return
 				}
@@ -101,5 +101,5 @@ func RunProgress(ctx context.Context, max int, args []string) (m *progressDialog
 			}
 		}
 	}()
-	return
+	return dlg, nil
 }

list.go

@@ -2,25 +2,19 @@ package zenity
 
 // List displays the list dialog.
 //
-// Returns false on cancel, or ErrExtraButton.
-//
 // Valid options: Title, Width, Height, OKLabel, CancelLabel, ExtraButton,
 // Icon, DefaultItems, DisallowEmpty.
-func List(text string, items []string, options ...Option) (string, bool, error) {
+func List(text string, items []string, options ...Option) (string, error) {
 	return list(text, items, applyOptions(options))
 }
 
 // ListItems displays the list dialog.
-//
+func ListItems(text string, items ...string) (string, error) {
-// Returns false on cancel, or ErrExtraButton.
-func ListItems(text string, items ...string) (string, bool, error) {
 	return List(text, items)
 }
 
 // ListMultiple displays the list dialog, allowing multiple items to be selected.
 //
-// Returns a nil slice on cancel, or ErrExtraButton.
-//
 // Valid options: Title, Width, Height, OKLabel, CancelLabel, ExtraButton,
 // Icon, DefaultItems, DisallowEmpty.
 func ListMultiple(text string, items []string, options ...Option) ([]string, error) {
@@ -28,8 +22,6 @@ func ListMultiple(text string, items []string, options ...Option) ([]string, err
 }
 
 // ListMultipleItems displays the list dialog, allowing multiple items to be selected.
-//
-// Returns a nil slice on cancel, or ErrExtraButton.
 func ListMultipleItems(text string, items ...string) ([]string, error) {
 	return ListMultiple(text, items)
 }

list_darwin.go

@@ -4,7 +4,7 @@ import (
 	"github.com/ncruces/zenity/internal/zenutil"
 )
 
-func list(text string, items []string, opts options) (string, bool, error) {
+func list(text string, items []string, opts options) (string, error) {
 	var data zenutil.List
 	data.Items = items
 	data.Options.Prompt = &text

list_test.go

@@ -47,7 +47,7 @@ func ExampleListMultipleItems() {
 func TestListTimeout(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second/10)
 
-	_, _, err := zenity.List("", nil, zenity.Context(ctx))
+	_, err := zenity.List("", nil, zenity.Context(ctx))
 	if !os.IsTimeout(err) {
 		t.Error("did not timeout:", err)
 	}
@@ -59,7 +59,7 @@ func TestListCancel(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	cancel()
 
-	_, _, err := zenity.List("", nil, zenity.Context(ctx))
+	_, err := zenity.List("", nil, zenity.Context(ctx))
 	if !errors.Is(err, context.Canceled) {
 		t.Error("was not canceled:", err)
 	}

list_unix.go

@@ -6,7 +6,7 @@ import (
 	"github.com/ncruces/zenity/internal/zenutil"
 )
 
-func list(text string, items []string, opts options) (string, bool, error) {
+func list(text string, items []string, opts options) (string, error) {
 	args := []string{"--list", "--column=", "--hide-header", "--text", text}
 	args = appendTitle(args, opts)
 	args = appendButtons(args, opts)

list_windows.go

@@ -5,12 +5,12 @@ import (
 	"unsafe"
 )
 
-func list(text string, items []string, opts options) (string, bool, error) {
+func list(text string, items []string, opts options) (string, error) {
 	items, err := listDlg(text, items, false, opts)
 	if len(items) == 1 {
-		return items[0], true, err
+		return items[0], err
 	}
-	return "", false, err
+	return "", err
 }
 
 func listMultiple(text string, items []string, opts options) ([]string, error) {
@@ -62,6 +62,7 @@ func listDlg(text string, items []string, multiple bool, opts options) (out []st
 			postQuitMessage.Call(0)
 
 		case 0x0010: // WM_CLOSE
+			err = ErrCanceled
 			destroyWindow.Call(wnd)
 
 		case 0x0111: // WM_COMMAND
@@ -88,6 +89,7 @@ func listDlg(text string, items []string, multiple bool, opts options) (out []st
 					}
 				}
 			case 2: // IDCANCEL
+				err = ErrCanceled
 			case 7: // IDNO
 				err = ErrExtraButton
 			}

msg.go

@@ -1,46 +1,34 @@
 package zenity
 
-// ErrExtraButton is returned by dialog functions when the extra button is
-// pressed.
-const ErrExtraButton = stringErr("extra button pressed")
-
 // Question displays the question dialog.
 //
-// Returns true on OK, false on Cancel, or ErrExtraButton.
-//
 // Valid options: Title, Width, Height, OKLabel, CancelLabel, ExtraButton,
 // Icon, NoWrap, Ellipsize, DefaultCancel.
-func Question(text string, options ...Option) (bool, error) {
+func Question(text string, options ...Option) error {
 	return message(questionKind, text, applyOptions(options))
 }
 
 // Info displays the info dialog.
 //
-// Returns true on OK, false on dismiss, or ErrExtraButton.
-//
 // Valid options: Title, Width, Height, OKLabel, ExtraButton, Icon,
 // NoWrap, Ellipsize.
-func Info(text string, options ...Option) (bool, error) {
+func Info(text string, options ...Option) error {
 	return message(infoKind, text, applyOptions(options))
 }
 
 // Warning displays the warning dialog.
 //
-// Returns true on OK, false on dismiss, or ErrExtraButton.
-//
 // Valid options: Title, Width, Height, OKLabel, ExtraButton, Icon,
 // NoWrap, Ellipsize.
-func Warning(text string, options ...Option) (bool, error) {
+func Warning(text string, options ...Option) error {
 	return message(warningKind, text, applyOptions(options))
 }
 
 // Error displays the error dialog.
 //
-// Returns true on OK, false on dismiss, or ErrExtraButton.
-//
 // Valid options: Title, Width, Height, OKLabel, ExtraButton, Icon,
 // NoWrap, Ellipsize.
-func Error(text string, options ...Option) (bool, error) {
+func Error(text string, options ...Option) error {
 	return message(errorKind, text, applyOptions(options))
 }
 

msg_darwin.go

@@ -4,7 +4,7 @@ import (
 	"github.com/ncruces/zenity/internal/zenutil"
 )
 
-func message(kind messageKind, text string, opts options) (bool, error) {
+func message(kind messageKind, text string, opts options) error {
 	var data zenutil.Dialog
 	data.Text = text
 	data.Options.Timeout = zenutil.Timeout
@@ -33,6 +33,6 @@ func message(kind messageKind, text string, opts options) (bool, error) {
 	data.SetButtons(getButtons(dialog, kind == questionKind, opts))
 
 	out, err := zenutil.Run(opts.ctx, "dialog", data)
-	_, ok, err := strResult(opts, out, err)
+	_, err = strResult(opts, out, err)
-	return ok, err
+	return err
 }

msg_test.go

@@ -38,7 +38,7 @@ func ExampleQuestion() {
 	// Output:
 }
 
-var msgFuncs = []func(string, ...zenity.Option) (bool, error){
+var msgFuncs = []func(string, ...zenity.Option) error{
 	zenity.Error,
 	zenity.Info,
 	zenity.Warning,
@@ -49,7 +49,7 @@ func TestMessageTimeout(t *testing.T) {
 	for _, f := range msgFuncs {
 		ctx, cancel := context.WithTimeout(context.Background(), time.Second/10)
 
-		_, err := f("text", zenity.Context(ctx))
+		err := f("text", zenity.Context(ctx))
 		if !os.IsTimeout(err) {
 			t.Error("did not timeout:", err)
 		}
@@ -63,7 +63,7 @@ func TestMessageCancel(t *testing.T) {
 	cancel()
 
 	for _, f := range msgFuncs {
-		_, err := f("text", zenity.Context(ctx))
+		err := f("text", zenity.Context(ctx))
 		if !errors.Is(err, context.Canceled) {
 			t.Error("was not canceled:", err)
 		}

msg_unix.go

@@ -6,7 +6,7 @@ import (
 	"github.com/ncruces/zenity/internal/zenutil"
 )
 
-func message(kind messageKind, text string, opts options) (bool, error) {
+func message(kind messageKind, text string, opts options) error {
 	args := []string{"--text", text, "--no-markup"}
 	switch kind {
 	case questionKind:
@@ -47,6 +47,6 @@ func message(kind messageKind, text string, opts options) (bool, error) {
 	}
 
 	out, err := zenutil.Run(opts.ctx, args)
-	_, ok, err := strResult(opts, out, err)
+	_, err = strResult(opts, out, err)
-	return ok, err
+	return err
 }

msg_windows.go

@@ -12,7 +12,7 @@ var (
 	getDlgCtrlID = user32.NewProc("GetDlgCtrlID")
 )
 
-func message(kind messageKind, text string, opts options) (bool, error) {
+func message(kind messageKind, text string, opts options) error {
 	var flags uintptr
 
 	switch {
@@ -48,7 +48,7 @@ func message(kind messageKind, text string, opts options) (bool, error) {
 	if opts.ctx != nil || opts.okLabel != nil || opts.cancelLabel != nil || opts.extraButton != nil {
 		unhook, err := hookMessageLabels(kind, opts)
 		if err != nil {
-			return false, err
+			return err
 		}
 		defer unhook()
 	}
@@ -62,17 +62,17 @@ func message(kind messageKind, text string, opts options) (bool, error) {
 	s, _, err := messageBox.Call(0, strptr(text), title, flags)
 
 	if opts.ctx != nil && opts.ctx.Err() != nil {
-		return false, opts.ctx.Err()
+		return opts.ctx.Err()
 	}
 	switch s {
 	case 1, 6: // IDOK, IDYES
-		return true, nil
+		return nil
 	case 2: // IDCANCEL
-		return false, nil
+		return ErrCanceled
 	case 7: // IDNO
-		return false, ErrExtraButton
+		return ErrExtraButton
 	default:
-		return false, err
+		return err
 	}
 }
 
@@ -89,11 +89,7 @@ func hookMessageLabels(kind messageKind, opts options) (unhook context.CancelFun
 					case 1, 6: // IDOK, IDYES
 						text = opts.okLabel
 					case 2: // IDCANCEL
-						if kind == questionKind {
 						text = opts.cancelLabel
-						} else {
-							text = opts.okLabel
-						}
 					case 7: // IDNO
 						text = opts.extraButton
 					}

pwd.go

@@ -2,10 +2,8 @@ package zenity
 
 // Password displays the password dialog.
 //
-// Returns false on cancel, or ErrExtraButton.
-//
 // Valid options: Title, OKLabel, CancelLabel, ExtraButton, Icon, Username.
-func Password(options ...Option) (usr string, pw string, ok bool, err error) {
+func Password(options ...Option) (usr string, pw string, err error) {
 	return password(applyOptions(options))
 }
 

pwd_stub.go

@@ -2,8 +2,8 @@
 
 package zenity
 
-func password(opts options) (string, string, bool, error) {
+func password(opts options) (string, string, error) {
 	opts.hideText = true
-	str, ok, err := entry("Password:", opts)
+	str, err := entry("Password:", opts)
-	return "", str, ok, err
+	return "", str, err
 }

pwd_test.go

@@ -18,7 +18,7 @@ func ExamplePassword() {
 func TestPasswordTimeout(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second/10)
 
-	_, _, _, err := zenity.Password(zenity.Context(ctx))
+	_, _, err := zenity.Password(zenity.Context(ctx))
 	if !os.IsTimeout(err) {
 		t.Error("did not timeout:", err)
 	}
@@ -30,7 +30,7 @@ func TestPasswordCancel(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	cancel()
 
-	_, _, _, err := zenity.Password(zenity.Context(ctx))
+	_, _, err := zenity.Password(zenity.Context(ctx))
 	if !errors.Is(err, context.Canceled) {
 		t.Error("was not canceled:", err)
 	}

pwd_unix.go

@@ -8,7 +8,7 @@ import (
 	"github.com/ncruces/zenity/internal/zenutil"
 )
 
-func password(opts options) (string, string, bool, error) {
+func password(opts options) (string, string, error) {
 	args := []string{"--password"}
 	args = appendTitle(args, opts)
 	args = appendButtons(args, opts)
@@ -17,11 +17,11 @@ func password(opts options) (string, string, bool, error) {
 	}
 
 	out, err := zenutil.Run(opts.ctx, args)
-	str, ok, err := strResult(opts, out, err)
+	str, err := strResult(opts, out, err)
-	if ok && opts.username {
+	if err == nil && opts.username {
 		if split := strings.SplitN(string(out), "|", 2); len(split) == 2 {
-			return split[0], split[1], true, nil
+			return split[0], split[1], nil
 		}
 	}
-	return "", str, ok, err
+	return "", str, err
 }

util_unix.go

@@ -55,23 +55,23 @@ func appendIcon(args []string, opts options) []string {
 	return args
 }
 
-func strResult(opts options, out []byte, err error) (string, bool, error) {
+func strResult(opts options, out []byte, err error) (string, error) {
 	out = bytes.TrimSuffix(out, []byte{'\n'})
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
 		if opts.extraButton != nil && *opts.extraButton == string(out) {
-			return "", false, ErrExtraButton
+			return "", ErrExtraButton
 		}
-		return "", false, nil
+		return "", ErrCanceled
 	}
 	if err != nil {
-		return "", false, err
+		return "", err
 	}
-	return string(out), true, nil
+	return string(out), nil
 }
 
 func lstResult(opts options, out []byte, err error) ([]string, error) {
-	str, ok, err := strResult(opts, out, err)
+	str, err := strResult(opts, out, err)
-	if ok {
+	if err == nil {
 		return strings.Split(str, zenutil.Separator), nil
 	}
 	return nil, err

util_windows.go

@@ -137,7 +137,7 @@ func setup() context.CancelFunc {
 func commDlgError() error {
 	s, _, _ := commDlgExtendedError.Call()
 	if s == 0 {
-		return nil
+		return ErrCanceled
 	} else {
 		return fmt.Errorf("Common Dialog error: %x", s)
 	}

zenity.go

@@ -21,6 +21,16 @@ func (e stringErr) Error() string { return string(e) }
 
 func stringPtr(s string) *string { return &s }
 
+// ErrCanceled is returned when the cancel button is pressed,
+// or window functions are used to close the dialog.
+const ErrCanceled = stringErr("dialog canceled")
+
+// ErrExtraButton is returned when the extra button is pressed.
+const ErrExtraButton = stringErr("extra button pressed")
+
+// ErrUnsupported is returned when a combination of options is not supported.
+const ErrUnsupported = stringErr("unsupported option")
+
 type options struct {
 	// General options
 	title       *string