Merge pull request #12 from ncruces/progress

Progress dialog.

README.md

@@ -13,14 +13,14 @@ Implemented dialogs:
 * [text entry](https://github.com/ncruces/zenity/wiki/Text-Entry-dialog)
 * [list](https://github.com/ncruces/zenity/wiki/List-dialog) (simple)
 * [password](https://github.com/ncruces/zenity/wiki/Password-dialog)
-* [file selection](https://github.com/ncruces/zenity/wiki/File-Selection-dialog)
+* [file selection](https://github.com/ncruces/zenity/wiki/File-selection-dialog)
-* [color selection](https://github.com/ncruces/zenity/wiki/Color-Selection-dialog)
+* [color selection](https://github.com/ncruces/zenity/wiki/Color-selection-dialog)
+* [progress](https://github.com/ncruces/zenity/wiki/Progress-dialog)
 * [notification](https://github.com/ncruces/zenity/wiki/Notification)
 
 Behavior on Windows, macOS and other Unixes might differ slightly.
 Some of that is intended (reflecting platform differences),
-other bits are unfortunate limitations,
+other bits are unfortunate limitations.
-others still are open to be fixed.
 
 ## Why?
 
@@ -37,7 +37,8 @@ Why reinvent this particular wheel?
     * Explorer shell not required
     * works in Server Core
   * Unicode support
-  * High DPI support (no manifest required)
+  * High DPI (no manifest required)
+  * Visual Styles (no manifest required)
   * WSL/Cygwin/MSYS2 [support](https://github.com/ncruces/zenity/wiki/Zenity-for-WSL,-Cygwin,-MSYS2)
 * on macOS:
   * only dependency is `osascript`

cmd/zenity/main.go

@@ -34,6 +34,7 @@ var (
 	passwordDlg       bool
 	fileSelectionDlg  bool
 	colorSelectionDlg bool
+	progressDlg       bool
 	notification      bool
 
 	// General options
@@ -73,6 +74,13 @@ var (
 	defaultColor string
 	showPalette  bool
 
+	// Progress options
+	percentage float64
+	pulsate    bool
+	autoClose  bool
+	autoKill   bool
+	noCancel   bool
+
 	// Windows specific options
 	cygpath bool
 	wslpath bool
@@ -95,32 +103,32 @@ func main() {
 	if zenutil.Timeout > 0 {
 		ctx, cancel := context.WithTimeout(context.Background(), time.Duration(zenutil.Timeout)*time.Second)
 		opts = append(opts, zenity.Context(ctx))
-		_ = cancel
+		defer cancel()
 	}
 
 	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 {
@@ -129,17 +137,21 @@ 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 progressDlg:
+		errResult(progress(opts...))
 
 	case notification:
 		errResult(zenity.Notify(text, opts...))
-	}
 
+	default:
 		flag.Usage()
+	}
 }
 
 func setupFlags() {
@@ -153,6 +165,7 @@ func setupFlags() {
 	flag.BoolVar(&passwordDlg, "password", false, "Display password dialog")
 	flag.BoolVar(&fileSelectionDlg, "file-selection", false, "Display file selection dialog")
 	flag.BoolVar(&colorSelectionDlg, "color-selection", false, "Display color selection dialog")
+	flag.BoolVar(&progressDlg, "progress", false, "Display progress indication dialog")
 	flag.BoolVar(&notification, "notification", false, "Display notification")
 
 	// General options
@@ -165,12 +178,12 @@ func setupFlags() {
 	flag.StringVar(&text, "text", "", "Set the dialog `text`")
 	flag.StringVar(&icon, "window-icon", "", "Set the window `icon` (error, info, question, warning)")
 	flag.BoolVar(&multiple, "multiple", false, "Allow multiple items to be selected")
+	flag.BoolVar(&defaultCancel, "default-cancel", false, "Give Cancel button focus by default")
 
 	// Message options
 	flag.StringVar(&icon, "icon-name", "", "Set the dialog `icon` (dialog-error, dialog-information, dialog-question, dialog-warning)")
 	flag.BoolVar(&noWrap, "no-wrap", false, "Do not enable text wrapping")
 	flag.BoolVar(&ellipsize, "ellipsize", false, "Enable ellipsizing in the dialog text")
-	flag.BoolVar(&defaultCancel, "default-cancel", false, "Give Cancel button focus by default")
 
 	// Entry options
 	flag.StringVar(&entryText, "entry-text", "", "Set the entry `text`")
@@ -194,6 +207,15 @@ func setupFlags() {
 	flag.StringVar(&defaultColor, "color", "", "Set the `color`")
 	flag.BoolVar(&showPalette, "show-palette", false, "Show the palette")
 
+	// Progress options
+	flag.Float64Var(&percentage, "percentage", 0, "Set initial `percentage`")
+	flag.BoolVar(&pulsate, "pulsate", false, "Pulsate progress bar")
+	flag.BoolVar(&noCancel, "no-cancel", false, "Hide Cancel button (Windows and Unix only)")
+	flag.BoolVar(&autoClose, "auto-close", false, "Dismiss the dialog when 100% has been reached")
+	if runtime.GOOS != "windows" {
+		flag.BoolVar(&autoKill, "auto-kill", false, "Kill parent process if Cancel button is pressed (macOS and Unix only)")
+	}
+
 	// Windows specific options
 	if runtime.GOOS == "windows" {
 		flag.BoolVar(&cygpath, "cygpath", false, "Use cygpath for path translation (Windows only)")
@@ -242,6 +264,9 @@ func validateFlags() {
 	if colorSelectionDlg {
 		n++
 	}
+	if progressDlg {
+		n++
+	}
 	if notification {
 		n++
 	}
@@ -297,6 +322,11 @@ func loadFlags() []zenity.Option {
 		setDefault(&icon, "dialog-password")
 		setDefault(&okLabel, "OK")
 		setDefault(&cancelLabel, "Cancel")
+	case progressDlg:
+		setDefault(&title, "Progress")
+		setDefault(&text, "Running...")
+		setDefault(&okLabel, "OK")
+		setDefault(&cancelLabel, "Cancel")
 	default:
 		setDefault(&text, "")
 	}
@@ -388,6 +418,15 @@ func loadFlags() []zenity.Option {
 		opts = append(opts, zenity.ShowPalette())
 	}
 
+	// Progress options
+
+	if pulsate {
+		opts = append(opts, zenity.Pulsate())
+	}
+	if noCancel {
+		opts = append(opts, zenity.NoCancel())
+	}
+
 	return opts
 }
 
@@ -395,6 +434,9 @@ 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 +450,33 @@ 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

cmd/zenity/progress.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"bufio"
+	"math"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/ncruces/zenity"
+)
+
+func progress(opts ...zenity.Option) (err error) {
+	dlg, err := zenity.Progress(opts...)
+	if err != nil {
+		return err
+	}
+
+	if autoKill {
+		defer func() {
+			if err == zenity.ErrCanceled {
+				killParent()
+			}
+		}()
+	}
+
+	if err := dlg.Text(text); err != nil {
+		return err
+	}
+	if err := dlg.Value(int(math.Round(percentage))); err != nil {
+		return err
+	}
+
+	lines := make(chan string)
+
+	go func() {
+		defer close(lines)
+		for scanner := bufio.NewScanner(os.Stdin); scanner.Scan(); {
+			lines <- scanner.Text()
+		}
+	}()
+
+	for {
+		select {
+		case line, ok := <-lines:
+			if !ok {
+				break
+			}
+			if len(line) > 1 && line[0] == '#' {
+				if err := dlg.Text(strings.TrimSpace(line[1:])); err != nil {
+					return err
+				}
+			} else if v, err := strconv.ParseFloat(line, 64); err == nil {
+				if err := dlg.Value(int(math.Round(v))); err != nil {
+					return err
+				}
+				if v >= 100 && autoClose {
+					return dlg.Close()
+				}
+			}
+			continue
+		case <-dlg.Done():
+		}
+		break
+	}
+
+	if err := dlg.Complete(); err != nil {
+		return err
+	}
+	<-dlg.Done()
+	return dlg.Close()
+}

cmd/zenity/progress_unix.go

@@ -0,0 +1,12 @@
+// +build !windows,!js
+
+package main
+
+import (
+	"os"
+	"syscall"
+)
+
+func killParent() {
+	syscall.Kill(os.Getppid(), syscall.SIGHUP)
+}

cmd/zenity/progress_windows.go

@@ -0,0 +1,3 @@
+package main
+
+func killParent() {}

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_test.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/ncruces/zenity"
+	"go.uber.org/goleak"
 )
 
 func ExampleSelectColor() {
@@ -24,18 +25,19 @@ func ExampleSelectColor_palette() {
 	// Output:
 }
 
-func TestSelectColorTimeout(t *testing.T) {
+func TestSelectColor_timeout(t *testing.T) {
+	defer goleak.VerifyNone(t)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second/10)
+	defer cancel()
 
 	_, err := zenity.SelectColor(zenity.Context(ctx))
 	if !os.IsTimeout(err) {
 		t.Error("did not timeout:", err)
 	}
-
-	cancel()
 }
 
-func TestSelectColorCancel(t *testing.T) {
+func TestSelectColor_cancel(t *testing.T) {
+	defer goleak.VerifyNone(t)
 	ctx, cancel := context.WithCancel(context.Background())
 	cancel()
 

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
 }

color_windows.go

@@ -9,7 +9,7 @@ import (
 var (
 	chooseColor = comdlg32.NewProc("ChooseColorW")
 
-	savedColors = [16]uint32{}
+	savedColors [16]uint32
 	colorsMutex sync.Mutex
 )
 
@@ -32,7 +32,7 @@ func selectColor(opts options) (color.Color, error) {
 	if opts.color != nil {
 		args.Flags |= 0x1 // CC_RGBINIT
 		n := color.NRGBAModel.Convert(opts.color).(color.NRGBA)
-		args.RgbResult = uint32(n.R) | (uint32(n.G) << 8) | (uint32(n.B) << 16)
+		args.RgbResult = uint32(n.R) | uint32(n.G)<<8 | uint32(n.B)<<16
 	}
 	if opts.showPalette {
 		args.Flags |= 0x4 // CC_PREVENTFULLOPEN

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

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/ncruces/zenity"
+	"go.uber.org/goleak"
 )
 
 func ExampleEntry() {
@@ -16,22 +17,23 @@ func ExampleEntry() {
 	// Output:
 }
 
-func TestEntryTimeout(t *testing.T) {
+func TestEntry_timeout(t *testing.T) {
+	defer goleak.VerifyNone(t)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second/10)
+	defer cancel()
 
-	_, _, err := zenity.Entry("", zenity.Context(ctx))
+	_, err := zenity.Entry("", zenity.Context(ctx))
 	if !os.IsTimeout(err) {
 		t.Error("did not timeout:", err)
 	}
-
-	cancel()
 }
 
-func TestEntryCancel(t *testing.T) {
+func TestEntry_cancel(t *testing.T) {
+	defer goleak.VerifyNone(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

@@ -4,10 +4,9 @@ import (
 	"syscall"
 )
 
-func entry(text string, opts options) (out string, ok bool, err error) {
+func entry(text string, opts options) (out string, err error) {
-	var title string
+	if opts.title == nil {
-	if opts.title != nil {
+		opts.title = stringPtr("")
-		title = *opts.title
 	}
 	if opts.okLabel == nil {
 		opts.okLabel = stringPtr("OK")
@@ -15,10 +14,7 @@ func entry(text string, opts options) (out string, ok bool, err error) {
 	if opts.cancelLabel == nil {
 		opts.cancelLabel = stringPtr("Cancel")
 	}
-	return entryDlg(title, text, opts)
-}
 
-func entryDlg(title, text string, opts options) (out string, ok bool, err error) {
 	defer setup()()
 	font := getFont()
 	defer font.Delete()
@@ -33,6 +29,7 @@ func entryDlg(title, text string, opts options) (out string, ok bool, err error)
 		sendMessage.Call(editCtl, 0x0030 /* WM_SETFONT */, hfont, 1)
 		sendMessage.Call(okBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
 		sendMessage.Call(cancelBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
+		sendMessage.Call(extraBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
 		setWindowPos.Call(wnd, 0, 0, 0, dpi.Scale(281), dpi.Scale(141), 0x6)                            // SWP_NOZORDER|SWP_NOMOVE
 		setWindowPos.Call(textCtl, 0, dpi.Scale(12), dpi.Scale(10), dpi.Scale(241), dpi.Scale(16), 0x4) // SWP_NOZORDER
 		setWindowPos.Call(editCtl, 0, dpi.Scale(12), dpi.Scale(30), dpi.Scale(241), dpi.Scale(24), 0x4) // SWP_NOZORDER
@@ -40,7 +37,6 @@ func entryDlg(title, text string, opts options) (out string, ok bool, err error)
 			setWindowPos.Call(okBtn, 0, dpi.Scale(95), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4)      // SWP_NOZORDER
 			setWindowPos.Call(cancelBtn, 0, dpi.Scale(178), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4) // SWP_NOZORDER
 		} else {
-			sendMessage.Call(extraBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
 			setWindowPos.Call(okBtn, 0, dpi.Scale(12), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4)      // SWP_NOZORDER
 			setWindowPos.Call(extraBtn, 0, dpi.Scale(95), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4)   // SWP_NOZORDER
 			setWindowPos.Call(cancelBtn, 0, dpi.Scale(178), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4) // SWP_NOZORDER
@@ -53,6 +49,7 @@ func entryDlg(title, 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
@@ -61,8 +58,8 @@ func entryDlg(title, 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
 			}
@@ -72,39 +69,39 @@ func entryDlg(title, text string, opts options) (out string, ok bool, err error)
 			layout(dpi(uint32(wparam) >> 16))
 
 		default:
-			ret, _, _ := syscall.Syscall6(defWindowProc, 4, wnd, uintptr(msg), wparam, lparam, 0, 0)
+			res, _, _ := syscall.Syscall6(defWindowProc, 4, wnd, uintptr(msg), wparam, lparam, 0, 0)
-			return ret
+			return res
 		}
 
 		return 0
 	}
 
 	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)
 
 	wnd, _, _ = createWindowEx.Call(0x10101, // WS_EX_CONTROLPARENT|WS_EX_WINDOWEDGE|WS_EX_DLGMODALFRAME
-		cls, strptr(title),
+		cls, strptr(*opts.title),
 		0x84c80000, // WS_POPUPWINDOW|WS_CLIPSIBLINGS|WS_DLGFRAME
 		0x80000000, // CW_USEDEFAULT
 		0x80000000, // CW_USEDEFAULT
-		281, 141, 0, 0, instance)
+		281, 141, 0, 0, instance, 0)
 
 	textCtl, _, _ = createWindowEx.Call(0,
 		strptr("STATIC"), strptr(text),
 		0x5002e080, // WS_CHILD|WS_VISIBLE|WS_GROUP|SS_WORDELLIPSIS|SS_EDITCONTROL|SS_NOPREFIX
-		12, 10, 241, 16, wnd, 0, instance)
+		12, 10, 241, 16, wnd, 0, instance, 0)
 
 	var flags uintptr = 0x50030080 // WS_CHILD|WS_VISIBLE|WS_GROUP|WS_TABSTOP|ES_AUTOHSCROLL
 	if opts.hideText {
@@ -113,21 +110,21 @@ func entryDlg(title, text string, opts options) (out string, ok bool, err error)
 	editCtl, _, _ = createWindowEx.Call(0x200, // WS_EX_CLIENTEDGE
 		strptr("EDIT"), strptr(opts.entryText),
 		flags,
-		12, 30, 241, 24, wnd, 0, instance)
+		12, 30, 241, 24, wnd, 0, instance, 0)
 
 	okBtn, _, _ = createWindowEx.Call(0,
 		strptr("BUTTON"), strptr(*opts.okLabel),
 		0x50030001, // WS_CHILD|WS_VISIBLE|WS_GROUP|WS_TABSTOP|BS_DEFPUSHBUTTON
-		12, 66, 75, 24, wnd, 1 /* IDOK */, instance)
+		12, 66, 75, 24, wnd, 1 /* IDOK */, instance, 0)
 	cancelBtn, _, _ = createWindowEx.Call(0,
 		strptr("BUTTON"), strptr(*opts.cancelLabel),
 		0x50010000, // WS_CHILD|WS_VISIBLE|WS_GROUP|WS_TABSTOP
-		12, 66, 75, 24, wnd, 2 /* IDCANCEL */, instance)
+		12, 66, 75, 24, wnd, 2 /* IDCANCEL */, instance, 0)
 	if opts.extraButton != nil {
 		extraBtn, _, _ = createWindowEx.Call(0,
 			strptr("BUTTON"), strptr(*opts.extraButton),
 			0x50010000, // WS_CHILD|WS_VISIBLE|WS_GROUP|WS_TABSTOP
-			12, 66, 75, 24, wnd, 7 /* IDNO */, instance)
+			12, 66, 75, 24, wnd, 7 /* IDNO */, instance, 0)
 	}
 
 	layout(getDPI(wnd))
@@ -149,13 +146,13 @@ func entryDlg(title, 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) {
@@ -69,6 +63,9 @@ func Filename(filename string) Option {
 //
 // macOS hides filename filters from the user,
 // and only supports filtering by extension (or "type").
+//
+// Patterns may use the GTK syntax on all platforms:
+// https://developer.gnome.org/pygtk/stable/class-gtkfilefilter.html#method-gtkfilefilter--add-pattern
 type FileFilter struct {
 	Name     string   // display string that describes the filter (optional)
 	Patterns []string // filter patterns for the display string

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_test.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/ncruces/zenity"
+	"go.uber.org/goleak"
 )
 
 const defaultPath = ``
@@ -77,7 +78,7 @@ var fileFuncs = []func(...zenity.Option) (string, error){
 	},
 }
 
-func TestFileTimeout(t *testing.T) {
+func TestFile_timeout(t *testing.T) {
 	for _, f := range fileFuncs {
 		ctx, cancel := context.WithTimeout(context.Background(), time.Second/10)
 
@@ -87,10 +88,12 @@ func TestFileTimeout(t *testing.T) {
 		}
 
 		cancel()
+		goleak.VerifyNone(t)
 	}
 }
 
-func TestFileCancel(t *testing.T) {
+func TestFile_cancel(t *testing.T) {
+	defer goleak.VerifyNone(t)
 	ctx, cancel := context.WithCancel(context.Background())
 	cancel()
 

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

@@ -37,7 +37,7 @@ func selectFile(opts options) (string, error) {
 		args.Filter = &initFilters(opts.fileFilters)[0]
 	}
 
-	res := [32768]uint16{}
+	var res [32768]uint16
 	args.File = &res[0]
 	args.MaxFile = uint32(len(res))
 	args.InitialDir, args.DefExt = initDirNameExt(opts.filename, res[:])
@@ -82,7 +82,7 @@ func selectFileMutiple(opts options) ([]string, error) {
 		args.Filter = &initFilters(opts.fileFilters)[0]
 	}
 
-	res := [32768 + 1024*256]uint16{}
+	var res [32768 + 1024*256]uint16
 	args.File = &res[0]
 	args.MaxFile = uint32(len(res))
 	args.InitialDir, args.DefExt = initDirNameExt(opts.filename, res[:])
@@ -158,7 +158,7 @@ func selectFileSave(opts options) (string, error) {
 		args.Filter = &initFilters(opts.fileFilters)[0]
 	}
 
-	res := [32768]uint16{}
+	var res [32768]uint16
 	args.File = &res[0]
 	args.MaxFile = uint32(len(res))
 	args.InitialDir, args.DefExt = initDirNameExt(opts.filename, res[:])
@@ -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)
@@ -335,11 +335,11 @@ 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)
 
-	res := [32768]uint16{}
+	var res [32768]uint16
 	shGetPathFromIDListEx.Call(ptr, uintptr(unsafe.Pointer(&res[0])), uintptr(len(res)), 0)
 
 	str := syscall.UTF16ToString(res[:])

internal/zenutil/env.go

@@ -0,0 +1,12 @@
+package zenutil
+
+// These are internal.
+const (
+	ErrCanceled    = stringErr("dialog canceled")
+	ErrExtraButton = stringErr("extra button pressed")
+	ErrUnsupported = stringErr("unsupported option")
+)
+
+type stringErr string
+
+func (e stringErr) Error() string { return string(e) }

internal/zenutil/osa_generated.go

@@ -48,4 +48,25 @@ res.join({{json .Separator}})
 var app=Application.currentApplication()
 app.includeStandardAdditions=true
 void app.displayNotification({{json .Text}},{{json .Options}})
+{{- end}}
+{{define "progress" -}}
+var app=Application.currentApplication()
+app.includeStandardAdditions=true
+app.activate()
+ObjC.import('stdlib')
+ObjC.import('readline')
+{{- if .Total}}
+Progress.totalUnitCount={{.Total}}
+{{- end}}
+{{- if .Description}}
+Progress.description={{json .Description}}
+{{- end}}
+while(true){var s
+try{s=$.readline('')}catch(e){if(e.errorNumber===-128)$.exit(1)
+break}
+if(s.indexOf('#')===0){Progress.additionalDescription=s.slice(1)
+continue}
+var i=parseInt(s)
+if(i>=0&&Progress.totalUnitCount>0){Progress.completedUnitCount=i
+continue}}
 {{- end}}`))

internal/zenutil/osa_generator.go

@@ -4,7 +4,6 @@ package main
 
 import (
 	"bytes"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -17,7 +16,7 @@ import (
 func main() {
 	dir := os.Args[1]
 
-	files, err := ioutil.ReadDir(dir)
+	files, err := os.ReadDir(dir)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -26,12 +25,7 @@ func main() {
 
 	for _, file := range files {
 		name := file.Name()
-
+		data, err := os.ReadFile(filepath.Join(dir, name))
-		str.WriteString("\n" + `{{define "`)
-		str.WriteString(strings.TrimSuffix(name, filepath.Ext(name)))
-		str.WriteString(`" -}}` + "\n")
-
-		data, err := ioutil.ReadFile(filepath.Join(dir, name))
 		if err != nil {
 			log.Fatal(err)
 		}
@@ -40,6 +34,9 @@ func main() {
 			log.Fatal(err)
 		}
 
+		str.WriteString("\n" + `{{define "`)
+		str.WriteString(strings.TrimSuffix(name, filepath.Ext(name)))
+		str.WriteString(`" -}}` + "\n")
 		str.Write(data)
 		str.WriteString("\n{{- end}}")
 	}
@@ -108,5 +105,4 @@ import (
 var scripts = template.Must(template.New("").Funcs(template.FuncMap{"json": func(v interface{}) (string, error) {
 	b, err := json.Marshal(v)
 	return string(b), err
-}}).Parse(` + "`{{.}}`" + `))
+}}).Parse(` + "`{{.}}`))\n"))
-`))

internal/zenutil/osascripts/progress.gojs

@@ -0,0 +1,34 @@
+var app = Application.currentApplication()
+app.includeStandardAdditions = true
+app.activate()
+
+ObjC.import('stdlib')
+ObjC.import('readline')
+
+{{- if .Total}}
+    Progress.totalUnitCount = {{.Total}}
+{{- end}}
+{{- if .Description}}
+    Progress.description = {{json .Description}}
+{{- end}}
+
+while (true) {
+    var s
+    try {
+        s = $.readline('')
+    } catch (e) {
+        if (e.errorNumber === -128) $.exit(1)
+        break
+    }
+
+    if (s.indexOf('#') === 0) {
+        Progress.additionalDescription = s.slice(1)
+        continue
+    }
+
+    var i = parseInt(s)
+    if (i >= 0 && Progress.totalUnitCount > 0) {
+        Progress.completedUnitCount = i
+        continue
+    }
+}

internal/zenutil/progress_unix.go

@@ -0,0 +1,116 @@
+// +build !windows,!js
+
+package zenutil
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"os"
+	"os/exec"
+	"runtime"
+	"strconv"
+	"sync/atomic"
+	"time"
+)
+
+type progressDialog struct {
+	ctx     context.Context
+	cmd     *exec.Cmd
+	max     int
+	percent bool
+	closed  int32
+	lines   chan string
+	done    chan struct{}
+	err     error
+}
+
+func (d *progressDialog) send(line string) error {
+	select {
+	case d.lines <- line:
+		return nil
+	case <-d.done:
+		return d.err
+	}
+}
+
+func (d *progressDialog) Text(text string) error {
+	return d.send("#" + text)
+}
+
+func (d *progressDialog) Value(value int) error {
+	if d.percent {
+		return d.send(strconv.FormatFloat(100*float64(value)/float64(d.max), 'f', -1, 64))
+	} else {
+		return d.send(strconv.Itoa(value))
+	}
+}
+
+func (d *progressDialog) MaxValue() int {
+	return d.max
+}
+
+func (d *progressDialog) Done() <-chan struct{} {
+	return d.done
+}
+
+func (d *progressDialog) Complete() error {
+	err := d.Value(d.max)
+	close(d.lines)
+	return err
+}
+
+func (d *progressDialog) Close() error {
+	atomic.StoreInt32(&d.closed, 1)
+	d.cmd.Process.Signal(os.Interrupt)
+	<-d.done
+	return d.err
+}
+
+func (d *progressDialog) wait(extra *string, out *bytes.Buffer) {
+	err := d.cmd.Wait()
+	if cerr := d.ctx.Err(); cerr != nil {
+		err = cerr
+	}
+	if eerr, ok := err.(*exec.ExitError); ok {
+		switch {
+		case eerr.ExitCode() == -1 && atomic.LoadInt32(&d.closed) != 0:
+			err = nil
+		case eerr.ExitCode() == 1:
+			if extra != nil && *extra+"\n" == string(out.Bytes()) {
+				err = ErrExtraButton
+			} else {
+				err = ErrCanceled
+			}
+		}
+	}
+	d.err = err
+	close(d.done)
+}
+
+func (d *progressDialog) pipe(w io.WriteCloser) {
+	defer w.Close()
+	var timeout = time.Second
+	if runtime.GOOS == "darwin" {
+		timeout = 40 * time.Millisecond
+	}
+	for {
+		var line string
+		select {
+		case s, ok := <-d.lines:
+			if !ok {
+				return
+			}
+			line = s
+		case <-d.ctx.Done():
+			return
+		case <-d.done:
+			return
+		case <-time.After(timeout):
+			// line = ""
+		}
+		if _, err := w.Write([]byte(line + "\n")); err != nil {
+			return
+		}
+	}
+}

internal/zenutil/run_darwin.go

@@ -1,30 +1,29 @@
 package zenutil
 
 import (
+	"bytes"
 	"context"
 	"io/ioutil"
 	"os"
 	"os/exec"
-	"strings"
+	"path/filepath"
 	"syscall"
 )
 
 // Run is internal.
 func Run(ctx context.Context, script string, data interface{}) ([]byte, error) {
-	var buf strings.Builder
+	var buf bytes.Buffer
-
 	err := scripts.ExecuteTemplate(&buf, script, data)
 	if err != nil {
 		return nil, err
 	}
 
-	script = buf.String()
 	if Command {
 		// Try to use syscall.Exec, fallback to exec.Command.
 		if path, err := exec.LookPath("osascript"); err != nil {
 		} else if t, err := ioutil.TempFile("", ""); err != nil {
 		} else if err := os.Remove(t.Name()); err != nil {
-		} else if _, err := t.WriteString(script); err != nil {
+		} else if _, err := t.Write(buf.Bytes()); err != nil {
 		} else if _, err := t.Seek(0, 0); err != nil {
 		} else if err := syscall.Dup2(int(t.Fd()), syscall.Stdin); err != nil {
 		} else if err := os.Stderr.Close(); err != nil {
@@ -35,7 +34,7 @@ func Run(ctx context.Context, script string, data interface{}) ([]byte, error) {
 
 	if ctx != nil {
 		cmd := exec.CommandContext(ctx, "osascript", "-l", "JavaScript")
-		cmd.Stdin = strings.NewReader(script)
+		cmd.Stdin = &buf
 		out, err := cmd.Output()
 		if ctx.Err() != nil {
 			err = ctx.Err()
@@ -43,25 +42,86 @@ func Run(ctx context.Context, script string, data interface{}) ([]byte, error) {
 		return out, err
 	}
 	cmd := exec.Command("osascript", "-l", "JavaScript")
-	cmd.Stdin = strings.NewReader(script)
+	cmd.Stdin = &buf
 	return cmd.Output()
 }
 
-// File is internal.
+// RunProgress is internal.
-type File struct {
+func RunProgress(ctx context.Context, max int, data Progress) (dlg *progressDialog, err error) {
-	Operation string
+	var buf bytes.Buffer
-	Separator string
+	err = scripts.ExecuteTemplate(&buf, "progress", data)
-	Options   FileOptions
+	if err != nil {
-}
+		return nil, err
+	}
 
-// FileOptions is internal.
+	t, err := ioutil.TempDir("", "")
-type FileOptions struct {
+	if err != nil {
-	Prompt     *string  `json:"withPrompt,omitempty"`
+		return nil, err
-	Type       []string `json:"ofType,omitempty"`
+	}
-	Name       string   `json:"defaultName,omitempty"`
+	defer func() {
-	Location   string   `json:"defaultLocation,omitempty"`
+		if err != nil {
-	Multiple   bool     `json:"multipleSelectionsAllowed,omitempty"`
+			if ctx != nil && ctx.Err() != nil {
-	Invisibles bool     `json:"invisibles,omitempty"`
+				err = ctx.Err()
+			}
+			os.RemoveAll(t)
+		}
+	}()
+	if ctx == nil {
+		ctx = context.Background()
+	}
+
+	var cmd *exec.Cmd
+	name := filepath.Join(t, "progress.app")
+
+	cmd = exec.CommandContext(ctx, "osacompile", "-l", "JavaScript", "-o", name)
+	cmd.Stdin = &buf
+	if err := cmd.Run(); err != nil {
+		return nil, err
+	}
+
+	plist := filepath.Join(name, "Contents/Info.plist")
+
+	cmd = exec.CommandContext(ctx, "defaults", "write", plist, "LSUIElement", "true")
+	if err := cmd.Run(); err != nil {
+		return nil, err
+	}
+
+	cmd = exec.CommandContext(ctx, "defaults", "write", plist, "CFBundleName", "")
+	if err := cmd.Run(); err != nil {
+		return nil, err
+	}
+
+	var executable string
+	cmd = exec.CommandContext(ctx, "defaults", "read", plist, "CFBundleExecutable")
+	if out, err := cmd.Output(); err != nil {
+		return nil, err
+	} else {
+		out = bytes.TrimSuffix(out, []byte{'\n'})
+		executable = filepath.Join(name, "Contents/MacOS", string(out))
+	}
+
+	cmd = exec.CommandContext(ctx, executable)
+	pipe, err := cmd.StdinPipe()
+	if err != nil {
+		return nil, err
+	}
+	if err := cmd.Start(); err != nil {
+		return nil, err
+	}
+
+	dlg = &progressDialog{
+		ctx:   ctx,
+		cmd:   cmd,
+		max:   max,
+		lines: make(chan string),
+		done:  make(chan struct{}),
+	}
+	go dlg.pipe(pipe)
+	go func() {
+		defer os.RemoveAll(t)
+		dlg.wait(nil, nil)
+	}()
+	return dlg, nil
 }
 
 // Dialog is internal.
@@ -86,6 +146,25 @@ type DialogOptions struct {
 	Timeout int      `json:"givingUpAfter,omitempty"`
 }
 
+// DialogButtons is internal.
+type DialogButtons struct {
+	Buttons []string
+	Default int
+	Cancel  int
+	Extra   int
+}
+
+// SetButtons is internal.
+func (d *Dialog) SetButtons(btns DialogButtons) {
+	d.Options.Buttons = btns.Buttons
+	d.Options.Default = btns.Default
+	d.Options.Cancel = btns.Cancel
+	if btns.Extra > 0 {
+		name := btns.Buttons[btns.Extra-1]
+		d.Extra = &name
+	}
+}
+
 // List is internal.
 type List struct {
 	Items     []string
@@ -104,6 +183,22 @@ type ListOptions struct {
 	Empty    bool     `json:"emptySelectionAllowed,omitempty"`
 }
 
+// File is internal.
+type File struct {
+	Operation string
+	Separator string
+	Options   FileOptions
+}
+
+type FileOptions struct {
+	Prompt     *string  `json:"withPrompt,omitempty"`
+	Type       []string `json:"ofType,omitempty"`
+	Name       string   `json:"defaultName,omitempty"`
+	Location   string   `json:"defaultLocation,omitempty"`
+	Multiple   bool     `json:"multipleSelectionsAllowed,omitempty"`
+	Invisibles bool     `json:"invisibles,omitempty"`
+}
+
 // Notify is internal.
 type Notify struct {
 	Text    string
@@ -116,19 +211,8 @@ type NotifyOptions struct {
 	Subtitle string  `json:"subtitle,omitempty"`
 }
 
-type Buttons struct {
+// Progress is internal.
-	Buttons []string
+type Progress struct {
-	Default int
+	Description *string
-	Cancel  int
+	Total       *int
-	Extra   int
-}
-
-func (d *Dialog) SetButtons(btns Buttons) {
-	d.Options.Buttons = btns.Buttons
-	d.Options.Default = btns.Default
-	d.Options.Cancel = btns.Cancel
-	if btns.Extra > 0 {
-		name := btns.Buttons[btns.Extra-1]
-		d.Extra = &name
-	}
 }

internal/zenutil/run_unix.go

@@ -3,6 +3,7 @@
 package zenutil
 
 import (
+	"bytes"
 	"context"
 	"os"
 	"os/exec"
@@ -40,3 +41,42 @@ func Run(ctx context.Context, args []string) ([]byte, error) {
 	}
 	return exec.Command(tool, args...).Output()
 }
+
+// RunProgress is internal.
+func RunProgress(ctx context.Context, max int, extra *string, args []string) (*progressDialog, error) {
+	if Command && path != "" {
+		if Timeout > 0 {
+			args = append(args, "--timeout", strconv.Itoa(Timeout))
+		}
+		syscall.Exec(path, append([]string{tool}, args...), os.Environ())
+	}
+	if ctx == nil {
+		ctx = context.Background()
+	}
+
+	cmd := exec.CommandContext(ctx, tool, args...)
+	pipe, err := cmd.StdinPipe()
+	if err != nil {
+		return nil, err
+	}
+	var out *bytes.Buffer
+	if extra != nil {
+		out = &bytes.Buffer{}
+		cmd.Stdout = out
+	}
+	if err := cmd.Start(); err != nil {
+		return nil, err
+	}
+
+	dlg := &progressDialog{
+		ctx:     ctx,
+		cmd:     cmd,
+		max:     max,
+		percent: true,
+		lines:   make(chan string),
+		done:    make(chan struct{}),
+	}
+	go dlg.pipe(pipe)
+	go dlg.wait(extra, out)
+	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 +4,11 @@ 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) {
+	if opts.extraButton != nil {
+		return "", ErrUnsupported
+	}
+
 	var data zenutil.List
 	data.Items = items
 	data.Options.Prompt = &text
@@ -19,6 +23,10 @@ func list(text string, items []string, opts options) (string, bool, error) {
 }
 
 func listMultiple(text string, items []string, opts options) ([]string, error) {
+	if opts.extraButton != nil {
+		return nil, ErrUnsupported
+	}
+
 	var data zenutil.List
 	data.Items = items
 	data.Options.Prompt = &text

list_test.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/ncruces/zenity"
+	"go.uber.org/goleak"
 )
 
 func ExampleList() {
@@ -44,22 +45,23 @@ func ExampleListMultipleItems() {
 	// Output:
 }
 
-func TestListTimeout(t *testing.T) {
+func TestList_timeout(t *testing.T) {
+	defer goleak.VerifyNone(t)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second/10)
+	defer cancel()
 
-	_, _, err := zenity.List("", nil, zenity.Context(ctx))
+	_, err := zenity.List("", nil, zenity.Context(ctx))
 	if !os.IsTimeout(err) {
 		t.Error("did not timeout:", err)
 	}
-
-	cancel()
 }
 
-func TestListCancel(t *testing.T) {
+func TestList_cancel(t *testing.T) {
+	defer goleak.VerifyNone(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

@@ -5,28 +5,21 @@ import (
 	"unsafe"
 )
 
-func list(text string, items []string, opts options) (string, bool, error) {
+func list(text string, items []string, opts options) (string, error) {
-	var title string
+	items, err := listDlg(text, items, false, opts)
-	if opts.title != nil {
-		title = *opts.title
-	}
-	if opts.okLabel == nil {
-		opts.okLabel = stringPtr("OK")
-	}
-	if opts.cancelLabel == nil {
-		opts.cancelLabel = stringPtr("Cancel")
-	}
-	items, err := listDlg(title, 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) {
-	var title string
+	return listDlg(text, items, true, opts)
-	if opts.title != nil {
+}
-		title = *opts.title
+
+func listDlg(text string, items []string, multiple bool, opts options) (out []string, err error) {
+	if opts.title == nil {
+		opts.title = stringPtr("")
 	}
 	if opts.okLabel == nil {
 		opts.okLabel = stringPtr("OK")
@@ -34,10 +27,7 @@ func listMultiple(text string, items []string, opts options) ([]string, error) {
 	if opts.cancelLabel == nil {
 		opts.cancelLabel = stringPtr("Cancel")
 	}
-	return listDlg(title, text, items, true, opts)
-}
 
-func listDlg(title, text string, items []string, multiple bool, opts options) (out []string, err error) {
 	defer setup()()
 	font := getFont()
 	defer font.Delete()
@@ -52,6 +42,7 @@ func listDlg(title, text string, items []string, multiple bool, opts options) (o
 		sendMessage.Call(listCtl, 0x0030 /* WM_SETFONT */, hfont, 1)
 		sendMessage.Call(okBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
 		sendMessage.Call(cancelBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
+		sendMessage.Call(extraBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
 		setWindowPos.Call(wnd, 0, 0, 0, dpi.Scale(281), dpi.Scale(281), 0x6)                             // SWP_NOZORDER|SWP_NOMOVE
 		setWindowPos.Call(textCtl, 0, dpi.Scale(12), dpi.Scale(10), dpi.Scale(241), dpi.Scale(16), 0x4)  // SWP_NOZORDER
 		setWindowPos.Call(listCtl, 0, dpi.Scale(12), dpi.Scale(30), dpi.Scale(241), dpi.Scale(164), 0x4) // SWP_NOZORDER
@@ -59,7 +50,6 @@ func listDlg(title, text string, items []string, multiple bool, opts options) (o
 			setWindowPos.Call(okBtn, 0, dpi.Scale(95), dpi.Scale(206), dpi.Scale(75), dpi.Scale(24), 0x4)      // SWP_NOZORDER
 			setWindowPos.Call(cancelBtn, 0, dpi.Scale(178), dpi.Scale(206), dpi.Scale(75), dpi.Scale(24), 0x4) // SWP_NOZORDER
 		} else {
-			sendMessage.Call(extraBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
 			setWindowPos.Call(okBtn, 0, dpi.Scale(12), dpi.Scale(206), dpi.Scale(75), dpi.Scale(24), 0x4)      // SWP_NOZORDER
 			setWindowPos.Call(extraBtn, 0, dpi.Scale(95), dpi.Scale(206), dpi.Scale(75), dpi.Scale(24), 0x4)   // SWP_NOZORDER
 			setWindowPos.Call(cancelBtn, 0, dpi.Scale(178), dpi.Scale(206), dpi.Scale(75), dpi.Scale(24), 0x4) // SWP_NOZORDER
@@ -72,6 +62,7 @@ func listDlg(title, text string, items []string, multiple bool, opts options) (o
 			postQuitMessage.Call(0)
 
 		case 0x0010: // WM_CLOSE
+			err = ErrCanceled
 			destroyWindow.Call(wnd)
 
 		case 0x0111: // WM_COMMAND
@@ -98,6 +89,7 @@ func listDlg(title, text string, items []string, multiple bool, opts options) (o
 					}
 				}
 			case 2: // IDCANCEL
+				err = ErrCanceled
 			case 7: // IDNO
 				err = ErrExtraButton
 			}
@@ -107,8 +99,8 @@ func listDlg(title, text string, items []string, multiple bool, opts options) (o
 			layout(dpi(uint32(wparam) >> 16))
 
 		default:
-			ret, _, _ := syscall.Syscall6(defWindowProc, 4, wnd, uintptr(msg), wparam, lparam, 0, 0)
+			res, _, _ := syscall.Syscall6(defWindowProc, 4, wnd, uintptr(msg), wparam, lparam, 0, 0)
-			return ret
+			return res
 		}
 
 		return 0
@@ -130,16 +122,16 @@ func listDlg(title, text string, items []string, multiple bool, opts options) (o
 	defer unregisterClass.Call(cls, instance)
 
 	wnd, _, _ = createWindowEx.Call(0x10101, // WS_EX_CONTROLPARENT|WS_EX_WINDOWEDGE|WS_EX_DLGMODALFRAME
-		cls, strptr(title),
+		cls, strptr(*opts.title),
 		0x84c80000, // WS_POPUPWINDOW|WS_CLIPSIBLINGS|WS_DLGFRAME
 		0x80000000, // CW_USEDEFAULT
 		0x80000000, // CW_USEDEFAULT
-		281, 281, 0, 0, instance)
+		281, 281, 0, 0, instance, 0)
 
 	textCtl, _, _ = createWindowEx.Call(0,
 		strptr("STATIC"), strptr(text),
 		0x5002e080, // WS_CHILD|WS_VISIBLE|WS_GROUP|SS_WORDELLIPSIS|SS_EDITCONTROL|SS_NOPREFIX
-		12, 10, 241, 16, wnd, 0, instance)
+		12, 10, 241, 16, wnd, 0, instance, 0)
 
 	var flags uintptr = 0x50320000 // WS_CHILD|WS_VISIBLE|WS_VSCROLL|WS_GROUP|WS_TABSTOP
 	if multiple {
@@ -148,21 +140,21 @@ func listDlg(title, text string, items []string, multiple bool, opts options) (o
 	listCtl, _, _ = createWindowEx.Call(0x200, // WS_EX_CLIENTEDGE
 		strptr("LISTBOX"), strptr(opts.entryText),
 		flags,
-		12, 30, 241, 164, wnd, 0, instance)
+		12, 30, 241, 164, wnd, 0, instance, 0)
 
 	okBtn, _, _ = createWindowEx.Call(0,
 		strptr("BUTTON"), strptr(*opts.okLabel),
 		0x50030001, // WS_CHILD|WS_VISIBLE|WS_GROUP|WS_TABSTOP|BS_DEFPUSHBUTTON
-		12, 206, 75, 24, wnd, 1 /* IDOK */, instance)
+		12, 206, 75, 24, wnd, 1 /* IDOK */, instance, 0)
 	cancelBtn, _, _ = createWindowEx.Call(0,
 		strptr("BUTTON"), strptr(*opts.cancelLabel),
 		0x50010000, // WS_CHILD|WS_VISIBLE|WS_GROUP|WS_TABSTOP
-		12, 206, 75, 24, wnd, 2 /* IDCANCEL */, instance)
+		12, 206, 75, 24, wnd, 2 /* IDCANCEL */, instance, 0)
 	if opts.extraButton != nil {
 		extraBtn, _, _ = createWindowEx.Call(0,
 			strptr("BUTTON"), strptr(*opts.extraButton),
 			0x50010000, // WS_CHILD|WS_VISIBLE|WS_GROUP|WS_TABSTOP
-			12, 206, 75, 24, wnd, 7 /* IDNO */, instance)
+			12, 206, 75, 24, wnd, 7 /* IDNO */, instance, 0)
 	}
 
 	for _, item := range items {

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

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/ncruces/zenity"
+	"go.uber.org/goleak"
 )
 
 func ExampleError() {
@@ -38,32 +39,34 @@ func ExampleQuestion() {
 	// Output:
 }
 
-var msgFuncs = []func(string, ...zenity.Option) (bool, error){
+var msgFuncs = []func(string, ...zenity.Option) error{
 	zenity.Error,
 	zenity.Info,
 	zenity.Warning,
 	zenity.Question,
 }
 
-func TestMessageTimeout(t *testing.T) {
+func TestMessage_timeout(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)
 		}
 
 		cancel()
+		goleak.VerifyNone(t)
 	}
 }
 
-func TestMessageCancel(t *testing.T) {
+func TestMessage_cancel(t *testing.T) {
+	defer goleak.VerifyNone(t)
 	ctx, cancel := context.WithCancel(context.Background())
 	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
 	}
 }
 
@@ -80,7 +80,7 @@ func hookMessageLabels(kind messageKind, opts options) (unhook context.CancelFun
 	return hookDialog(opts.ctx, func(wnd uintptr) {
 		enumChildWindows.Call(wnd,
 			syscall.NewCallback(func(wnd, lparam uintptr) uintptr {
-				name := [8]uint16{}
+				var name [8]uint16
 				getClassName.Call(wnd, uintptr(unsafe.Pointer(&name)), uintptr(len(name)))
 				if syscall.UTF16ToString(name[:]) == "Button" {
 					ctl, _, _ := getDlgCtrlID.Call(wnd)
@@ -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
 					}

notify_test.go

@@ -6,6 +6,7 @@ import (
 	"testing"
 
 	"github.com/ncruces/zenity"
+	"go.uber.org/goleak"
 )
 
 func ExampleNotify() {
@@ -15,7 +16,8 @@ func ExampleNotify() {
 	// Output:
 }
 
-func TestNotifyCancel(t *testing.T) {
+func TestNotify_cancel(t *testing.T) {
+	defer goleak.VerifyNone(t)
 	ctx, cancel := context.WithCancel(context.Background())
 	cancel()
 

progress.go

@@ -0,0 +1,51 @@
+package zenity
+
+// Progress displays the progress indication dialog.
+//
+// Valid options: Title, Width, Height, OKLabel, CancelLabel, ExtraButton,
+// Icon, MaxValue, Pulsate, NoCancel, TimeRemaining.
+func Progress(options ...Option) (ProgressDialog, error) {
+	return progress(applyOptions(options))
+}
+
+// ProgressDialog allows you to interact with the progress indication dialog.
+type ProgressDialog interface {
+	// Text sets the dialog text.
+	Text(string) error
+
+	// Value sets how much of the task has been completed.
+	Value(int) error
+
+	// MaxValue gets how much work the task requires in total.
+	MaxValue() int
+
+	// Complete marks the task completed.
+	Complete() error
+
+	// Close closes the dialog.
+	Close() error
+
+	// Done returns a channel that's closed when the dialog is closed.
+	Done() <-chan struct{}
+}
+
+// MaxValue returns an Option to set the maximum value (Windows and macOS only).
+// The default maximum value is 100.
+func MaxValue(value int) Option {
+	return funcOption(func(o *options) { o.maxValue = value })
+}
+
+// Pulsate returns an Option to pulsate the progress bar.
+func Pulsate() Option {
+	return funcOption(func(o *options) { o.maxValue = -1 })
+}
+
+// NoCancel returns an Option to hide the Cancel button (Windows and Unix only).
+func NoCancel() Option {
+	return funcOption(func(o *options) { o.noCancel = true })
+}
+
+// TimeRemaining returns an Option to estimate when progress will reach 100% (Unix only).
+func TimeRemaining() Option {
+	return funcOption(func(o *options) { o.timeRemaining = true })
+}

progress_darwin.go

@@ -0,0 +1,22 @@
+package zenity
+
+import (
+	"github.com/ncruces/zenity/internal/zenutil"
+)
+
+func progress(opts options) (ProgressDialog, error) {
+	if opts.extraButton != nil {
+		return nil, ErrUnsupported
+	}
+
+	var data zenutil.Progress
+	data.Description = opts.title
+	if opts.maxValue == 0 {
+		opts.maxValue = 100
+	}
+	if opts.maxValue >= 0 {
+		data.Total = &opts.maxValue
+	}
+
+	return zenutil.RunProgress(opts.ctx, opts.maxValue, data)
+}

progress_test.go

@@ -0,0 +1,100 @@
+package zenity_test
+
+import (
+	"context"
+	"errors"
+	"log"
+	"testing"
+	"time"
+
+	"github.com/ncruces/zenity"
+	"go.uber.org/goleak"
+)
+
+func ExampleProgress() {
+	dlg, err := zenity.Progress(
+		zenity.Title("Update System Logs"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer dlg.Close()
+
+	dlg.Text("Scanning mail logs...")
+	dlg.Value(0)
+	time.Sleep(time.Second)
+
+	dlg.Value(25)
+	time.Sleep(time.Second)
+
+	dlg.Text("Updating mail logs...")
+	dlg.Value(50)
+	time.Sleep(time.Second)
+
+	dlg.Text("Resetting cron jobs...")
+	dlg.Value(75)
+	time.Sleep(time.Second)
+
+	dlg.Text("Rebooting system...")
+	dlg.Value(100)
+	time.Sleep(time.Second)
+
+	dlg.Complete()
+	time.Sleep(time.Second)
+
+	// Output:
+}
+
+func ExampleProgress_pulsate() {
+	dlg, err := zenity.Progress(
+		zenity.Title("Update System Logs"),
+		zenity.Pulsate())
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer dlg.Close()
+
+	dlg.Text("Scanning mail logs...")
+	time.Sleep(time.Second)
+
+	dlg.Text("Updating mail logs...")
+	time.Sleep(time.Second)
+
+	dlg.Text("Resetting cron jobs...")
+	time.Sleep(time.Second)
+
+	dlg.Text("Rebooting system...")
+	time.Sleep(time.Second)
+
+	dlg.Complete()
+	time.Sleep(time.Second)
+
+	// Output:
+}
+
+func TestProgress_cancel(t *testing.T) {
+	defer goleak.VerifyNone(t)
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	_, err := zenity.Progress(zenity.Context(ctx))
+	if !errors.Is(err, context.Canceled) {
+		t.Error("was not canceled:", err)
+	}
+}
+
+func TestProgress_cancelAfter(t *testing.T) {
+	defer goleak.VerifyNone(t)
+	ctx, cancel := context.WithCancel(context.Background())
+
+	dlg, err := zenity.Progress(zenity.Context(ctx))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	go cancel()
+	<-dlg.Done()
+	err = dlg.Close()
+	if !errors.Is(err, context.Canceled) {
+		t.Error("was not canceled:", err)
+	}
+}

progress_unix.go

@@ -0,0 +1,28 @@
+// +build !windows,!darwin,!js
+
+package zenity
+
+import (
+	"github.com/ncruces/zenity/internal/zenutil"
+)
+
+func progress(opts options) (ProgressDialog, error) {
+	args := []string{"--progress"}
+	args = appendTitle(args, opts)
+	args = appendButtons(args, opts)
+	args = appendWidthHeight(args, opts)
+	args = appendIcon(args, opts)
+	if opts.maxValue == 0 {
+		opts.maxValue = 100
+	}
+	if opts.maxValue < 0 {
+		args = append(args, "--pulsate")
+	}
+	if opts.noCancel {
+		args = append(args, "--no-cancel")
+	}
+	if opts.timeRemaining {
+		args = append(args, "--time-remaining")
+	}
+	return zenutil.RunProgress(opts.ctx, opts.maxValue, opts.extraButton, args)
+}

progress_windows.go

@@ -0,0 +1,261 @@
+package zenity
+
+import (
+	"context"
+	"sync"
+	"syscall"
+)
+
+func progress(opts options) (ProgressDialog, error) {
+	if opts.title == nil {
+		opts.title = stringPtr("")
+	}
+	if opts.okLabel == nil {
+		opts.okLabel = stringPtr("OK")
+	}
+	if opts.cancelLabel == nil {
+		opts.cancelLabel = stringPtr("Cancel")
+	}
+	if opts.maxValue == 0 {
+		opts.maxValue = 100
+	}
+	if opts.ctx == nil {
+		opts.ctx = context.Background()
+	}
+
+	dlg := &progressDialog{
+		done: make(chan struct{}),
+		max:  opts.maxValue,
+	}
+	dlg.init.Add(1)
+
+	go func() {
+		err := progressDlg(opts, dlg)
+		if cerr := opts.ctx.Err(); cerr != nil {
+			err = cerr
+		}
+		dlg.err = err
+		close(dlg.done)
+	}()
+
+	dlg.init.Wait()
+	return dlg, nil
+}
+
+func progressDlg(opts options, dlg *progressDialog) (err error) {
+	defer setup()()
+	font := getFont()
+	defer font.Delete()
+	defWindowProc := defWindowProc.Addr()
+
+	layout := func(dpi dpi) {
+		hfont := font.ForDPI(dpi)
+		sendMessage.Call(dlg.textCtl, 0x0030 /* WM_SETFONT */, hfont, 1)
+		sendMessage.Call(dlg.okBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
+		sendMessage.Call(dlg.cancelBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
+		sendMessage.Call(dlg.extraBtn, 0x0030 /* WM_SETFONT */, hfont, 1)
+		setWindowPos.Call(dlg.wnd, 0, 0, 0, dpi.Scale(281), dpi.Scale(141), 0x6)                            // SWP_NOZORDER|SWP_NOMOVE
+		setWindowPos.Call(dlg.textCtl, 0, dpi.Scale(12), dpi.Scale(10), dpi.Scale(241), dpi.Scale(16), 0x4) // SWP_NOZORDER
+		setWindowPos.Call(dlg.progCtl, 0, dpi.Scale(12), dpi.Scale(30), dpi.Scale(241), dpi.Scale(24), 0x4) // SWP_NOZORDER
+		if dlg.extraBtn == 0 {
+			if dlg.cancelBtn == 0 {
+				setWindowPos.Call(dlg.okBtn, 0, dpi.Scale(178), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4) // SWP_NOZORDER
+			} else {
+				setWindowPos.Call(dlg.okBtn, 0, dpi.Scale(95), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4)      // SWP_NOZORDER
+				setWindowPos.Call(dlg.cancelBtn, 0, dpi.Scale(178), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4) // SWP_NOZORDER
+			}
+		} else {
+			if dlg.cancelBtn == 0 {
+				setWindowPos.Call(dlg.okBtn, 0, dpi.Scale(95), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4)     // SWP_NOZORDER
+				setWindowPos.Call(dlg.extraBtn, 0, dpi.Scale(178), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4) // SWP_NOZORDER
+			} else {
+				setWindowPos.Call(dlg.okBtn, 0, dpi.Scale(12), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4)      // SWP_NOZORDER
+				setWindowPos.Call(dlg.extraBtn, 0, dpi.Scale(95), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4)   // SWP_NOZORDER
+				setWindowPos.Call(dlg.cancelBtn, 0, dpi.Scale(178), dpi.Scale(66), dpi.Scale(75), dpi.Scale(24), 0x4) // SWP_NOZORDER
+			}
+		}
+	}
+
+	proc := func(wnd uintptr, msg uint32, wparam, lparam uintptr) uintptr {
+		switch msg {
+		case 0x0002: // WM_DESTROY
+			postQuitMessage.Call(0)
+
+		case 0x0010: // WM_CLOSE
+			err = ErrCanceled
+			destroyWindow.Call(wnd)
+
+		case 0x0111: // WM_COMMAND
+			switch wparam {
+			default:
+				return 1
+			case 1, 6: // IDOK, IDYES
+				//
+			case 2: // IDCANCEL
+				err = ErrCanceled
+			case 7: // IDNO
+				err = ErrExtraButton
+			}
+			destroyWindow.Call(wnd)
+
+		case 0x02e0: // WM_DPICHANGED
+			layout(dpi(uint32(wparam) >> 16))
+
+		default:
+			res, _, _ := syscall.Syscall6(defWindowProc, 4, wnd, uintptr(msg), wparam, lparam, 0, 0)
+			return res
+		}
+
+		return 0
+	}
+
+	if opts.ctx != nil && opts.ctx.Err() != nil {
+		return opts.ctx.Err()
+	}
+
+	instance, _, err := getModuleHandle.Call(0)
+	if instance == 0 {
+		return err
+	}
+
+	cls, err := registerClass(instance, syscall.NewCallback(proc))
+	if cls == 0 {
+		return err
+	}
+	defer unregisterClass.Call(cls, instance)
+
+	dlg.wnd, _, _ = createWindowEx.Call(0x10101, // WS_EX_CONTROLPARENT|WS_EX_WINDOWEDGE|WS_EX_DLGMODALFRAME
+		cls, strptr(*opts.title),
+		0x84c80000, // WS_POPUPWINDOW|WS_CLIPSIBLINGS|WS_DLGFRAME
+		0x80000000, // CW_USEDEFAULT
+		0x80000000, // CW_USEDEFAULT
+		281, 141, 0, 0, instance, 0)
+
+	dlg.textCtl, _, _ = createWindowEx.Call(0,
+		strptr("STATIC"), 0,
+		0x5002e080, // WS_CHILD|WS_VISIBLE|WS_GROUP|SS_WORDELLIPSIS|SS_EDITCONTROL|SS_NOPREFIX
+		12, 10, 241, 16, dlg.wnd, 0, instance, 0)
+
+	var flags uintptr = 0x50000001 // WS_CHILD|WS_VISIBLE|PBS_SMOOTH
+	if opts.maxValue < 0 {
+		flags |= 0x8 // PBS_MARQUEE
+	}
+	dlg.progCtl, _, _ = createWindowEx.Call(0,
+		strptr("msctls_progress32"), // PROGRESS_CLASS
+		0, flags,
+		12, 30, 241, 24, dlg.wnd, 0, instance, 0)
+
+	dlg.okBtn, _, _ = createWindowEx.Call(0,
+		strptr("BUTTON"), strptr(*opts.okLabel),
+		0x58030001, // WS_CHILD|WS_VISIBLE|WS_DISABLED|WS_GROUP|WS_TABSTOP|BS_DEFPUSHBUTTON
+		12, 66, 75, 24, dlg.wnd, 1 /* IDOK */, instance, 0)
+	if !opts.noCancel {
+		dlg.cancelBtn, _, _ = createWindowEx.Call(0,
+			strptr("BUTTON"), strptr(*opts.cancelLabel),
+			0x50010000, // WS_CHILD|WS_VISIBLE|WS_GROUP|WS_TABSTOP
+			12, 66, 75, 24, dlg.wnd, 2 /* IDCANCEL */, instance, 0)
+	}
+	if opts.extraButton != nil {
+		dlg.extraBtn, _, _ = createWindowEx.Call(0,
+			strptr("BUTTON"), strptr(*opts.extraButton),
+			0x50010000, // WS_CHILD|WS_VISIBLE|WS_GROUP|WS_TABSTOP
+			12, 66, 75, 24, dlg.wnd, 7 /* IDNO */, instance, 0)
+	}
+
+	layout(getDPI(dlg.wnd))
+	centerWindow(dlg.wnd)
+	showWindow.Call(dlg.wnd, 1 /* SW_SHOWNORMAL */, 0)
+	if opts.maxValue < 0 {
+		sendMessage.Call(dlg.progCtl, 0x40a /* PBM_SETMARQUEE */, 1, 0)
+	} else {
+		sendMessage.Call(dlg.progCtl, 0x406 /* PBM_SETRANGE32 */, 0, uintptr(opts.maxValue))
+	}
+	dlg.init.Done()
+
+	if opts.ctx != nil {
+		wait := make(chan struct{})
+		defer close(wait)
+		go func() {
+			select {
+			case <-opts.ctx.Done():
+				sendMessage.Call(dlg.wnd, 0x0112 /* WM_SYSCOMMAND */, 0xf060 /* SC_CLOSE */, 0)
+			case <-wait:
+			}
+		}()
+	}
+
+	// set default values
+	err = nil
+
+	if err := messageLoop(dlg.wnd); err != nil {
+		return err
+	}
+	if opts.ctx != nil && opts.ctx.Err() != nil {
+		return opts.ctx.Err()
+	}
+	return err
+}
+
+type progressDialog struct {
+	max       int
+	done      chan struct{}
+	init      sync.WaitGroup
+	wnd       uintptr
+	textCtl   uintptr
+	progCtl   uintptr
+	okBtn     uintptr
+	cancelBtn uintptr
+	extraBtn  uintptr
+	err       error
+}
+
+func (d *progressDialog) Text(text string) error {
+	select {
+	default:
+		setWindowText.Call(d.textCtl, strptr(text))
+		return nil
+	case <-d.done:
+		return d.err
+	}
+}
+
+func (d *progressDialog) Value(value int) error {
+	select {
+	default:
+		sendMessage.Call(d.progCtl, 0x402 /* PBM_SETPOS */, uintptr(value), 0)
+		if value >= d.max {
+			enableWindow.Call(d.okBtn, 1)
+		}
+		return nil
+	case <-d.done:
+		return d.err
+	}
+}
+
+func (d *progressDialog) MaxValue() int {
+	return d.max
+}
+
+func (d *progressDialog) Done() <-chan struct{} {
+	return d.done
+}
+
+func (d *progressDialog) Complete() error {
+	select {
+	default:
+		setWindowLong.Call(d.progCtl, intptr(-16) /* GWL_STYLE */, 0x50000001 /* WS_CHILD|WS_VISIBLE|PBS_SMOOTH */)
+		sendMessage.Call(d.progCtl, 0x406 /* PBM_SETRANGE32 */, 0, 1)
+		sendMessage.Call(d.progCtl, 0x402 /* PBM_SETPOS */, 1, 0)
+		enableWindow.Call(d.okBtn, 1)
+		enableWindow.Call(d.cancelBtn, 0)
+		return nil
+	case <-d.done:
+		return d.err
+	}
+}
+
+func (d *progressDialog) Close() error {
+	sendMessage.Call(d.wnd, 0x0112 /* WM_SYSCOMMAND */, 0xf060 /* SC_CLOSE */, 0)
+	<-d.done
+	return d.err
+}

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 +2,11 @@
 
 package zenity
 
-func password(opts options) (string, string, bool, error) {
+func password(opts options) (string, string, error) {
+	if opts.username {
+		return "", "", ErrUnsupported
+	}
 	opts.hideText = true
-	str, ok, err := entry("Password:", opts)
+	str, err := entry("Password:", opts)
-	return "", str, ok, err
+	return "", str, err
 }

pwd_test.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/ncruces/zenity"
+	"go.uber.org/goleak"
 )
 
 func ExamplePassword() {
@@ -15,22 +16,23 @@ func ExamplePassword() {
 	// Output:
 }
 
-func TestPasswordTimeout(t *testing.T) {
+func TestPassword_timeout(t *testing.T) {
+	defer goleak.VerifyNone(t)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second/10)
+	defer cancel()
 
-	_, _, _, err := zenity.Password(zenity.Context(ctx))
+	_, _, err := zenity.Password(zenity.Context(ctx))
 	if !os.IsTimeout(err) {
 		t.Error("did not timeout:", err)
 	}
-
-	cancel()
 }
 
-func TestPasswordCancel(t *testing.T) {
+func TestPassword_cancel(t *testing.T) {
+	defer goleak.VerifyNone(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_darwin.go

@@ -2,13 +2,13 @@ package zenity
 
 import "github.com/ncruces/zenity/internal/zenutil"
 
-func getButtons(dialog, okcancel bool, opts options) (btns zenutil.Buttons) {
+func getButtons(dialog, okcancel bool, opts options) (btns zenutil.DialogButtons) {
 	if !okcancel {
 		opts.cancelLabel = nil
 		opts.defaultCancel = false
 	}
 
-	if opts.okLabel != nil || opts.cancelLabel != nil || opts.extraButton != nil || (dialog != okcancel) {
+	if opts.okLabel != nil || opts.cancelLabel != nil || opts.extraButton != nil || dialog != okcancel {
 		if opts.okLabel == nil {
 			opts.okLabel = stringPtr("OK")
 		}

util_unix.go

@@ -3,7 +3,6 @@
 package zenity
 
 import (
-	"bytes"
 	"os/exec"
 	"strconv"
 	"strings"
@@ -55,23 +54,22 @@ 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) {
+		if opts.extraButton != nil && *opts.extraButton+"\n" == 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

@@ -13,6 +13,7 @@ import (
 )
 
 var (
+	comctl32 = syscall.NewLazyDLL("comctl32.dll")
 	comdlg32 = syscall.NewLazyDLL("comdlg32.dll")
 	gdi32    = syscall.NewLazyDLL("gdi32.dll")
 	kernel32 = syscall.NewLazyDLL("kernel32.dll")
@@ -21,6 +22,7 @@ var (
 	user32   = syscall.NewLazyDLL("user32.dll")
 	wtsapi32 = syscall.NewLazyDLL("wtsapi32.dll")
 
+	initCommonControlsEx = comctl32.NewProc("InitCommonControlsEx")
 	commDlgExtendedError = comdlg32.NewProc("CommDlgExtendedError")
 
 	deleteObject       = gdi32.NewProc("DeleteObject")
@@ -30,6 +32,10 @@ var (
 	getModuleHandle    = kernel32.NewProc("GetModuleHandleW")
 	getCurrentThreadId = kernel32.NewProc("GetCurrentThreadId")
 	getConsoleWindow   = kernel32.NewProc("GetConsoleWindow")
+	getSystemDirectory = kernel32.NewProc("GetSystemDirectoryW")
+	createActCtx       = kernel32.NewProc("CreateActCtxW")
+	activateActCtx     = kernel32.NewProc("ActivateActCtx")
+	deactivateActCtx   = kernel32.NewProc("DeactivateActCtx")
 
 	coInitializeEx   = ole32.NewProc("CoInitializeEx")
 	coUninitialize   = ole32.NewProc("CoUninitialize")
@@ -60,12 +66,14 @@ var (
 	systemParametersInfo         = user32.NewProc("SystemParametersInfoW")
 	setWindowPos                 = user32.NewProc("SetWindowPos")
 	getWindowRect                = user32.NewProc("GetWindowRect")
+	setWindowLong                = user32.NewProc("SetWindowLongPtrW")
 	getSystemMetrics             = user32.NewProc("GetSystemMetrics")
 	unregisterClass              = user32.NewProc("UnregisterClassW")
 	registerClassEx              = user32.NewProc("RegisterClassExW")
 	destroyWindow                = user32.NewProc("DestroyWindow")
 	createWindowEx               = user32.NewProc("CreateWindowExW")
 	showWindow                   = user32.NewProc("ShowWindow")
+	enableWindow                 = user32.NewProc("EnableWindow")
 	setFocus                     = user32.NewProc("SetFocus")
 	defWindowProc                = user32.NewProc("DefWindowProcW")
 )
@@ -96,24 +104,33 @@ func setup() context.CancelFunc {
 		setForegroundWindow.Call(hwnd)
 	}
 
-	var old uintptr
 	runtime.LockOSThread()
+
+	var restore uintptr
+	cookie := enableVisualStyles()
 	if setThreadDpiAwarenessContext.Find() == nil {
 		// try:
 		//   DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2
 		//   DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE
 		//   DPI_AWARENESS_CONTEXT_SYSTEM_AWARE
 		for i := -4; i <= -2; i++ {
-			restore, _, _ := setThreadDpiAwarenessContext.Call(uintptr(i))
+			restore, _, _ = setThreadDpiAwarenessContext.Call(uintptr(i))
 			if restore != 0 {
 				break
 			}
 		}
 	}
 
+	var icc _INITCOMMONCONTROLSEX
+	icc.Size = uint32(unsafe.Sizeof(icc))
+	icc.ICC = 0x00004020 // ICC_STANDARD_CLASSES|ICC_PROGRESS_CLASS
+
 	return func() {
-		if old != 0 {
+		if restore != 0 {
-			setThreadDpiAwarenessContext.Call(old)
+			setThreadDpiAwarenessContext.Call(restore)
+		}
+		if cookie != 0 {
+			deactivateActCtx.Call(cookie)
 		}
 		runtime.UnlockOSThread()
 	}
@@ -122,7 +139,7 @@ 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)
 	}
@@ -139,7 +156,7 @@ func hookDialog(ctx context.Context, initDialog func(wnd uintptr)) (unhook conte
 	hook, _, err = setWindowsHookEx.Call(12, // WH_CALLWNDPROCRET
 		syscall.NewCallback(func(code int32, wparam uintptr, lparam *_CWPRETSTRUCT) uintptr {
 			if lparam.Message == 0x0110 { // WM_INITDIALOG
-				name := [8]uint16{}
+				var name [8]uint16
 				getClassName.Call(lparam.Wnd, uintptr(unsafe.Pointer(&name)), uintptr(len(name)))
 				if syscall.UTF16ToString(name[:]) == "#32770" { // The class for a dialog box
 					var close bool
@@ -252,8 +269,8 @@ func (f *font) Delete() {
 
 func centerWindow(wnd uintptr) {
 	getMetric := func(i uintptr) int32 {
-		ret, _, _ := getSystemMetrics.Call(i)
+		n, _, _ := getSystemMetrics.Call(i)
-		return int32(ret)
+		return int32(n)
 	}
 
 	var rect _RECT
@@ -280,8 +297,8 @@ func registerClass(instance, proc uintptr) (uintptr, error) {
 	wcx.Background = 5 // COLOR_WINDOW
 	wcx.ClassName = syscall.StringToUTF16Ptr(name)
 
-	ret, _, err := registerClassEx.Call(uintptr(unsafe.Pointer(&wcx)))
+	atom, _, err := registerClassEx.Call(uintptr(unsafe.Pointer(&wcx)))
-	return ret, err
+	return atom, err
 }
 
 // https://docs.microsoft.com/en-us/windows/win32/winmsg/using-messages-and-message-queues
@@ -293,22 +310,62 @@ func messageLoop(wnd uintptr) error {
 
 	for {
 		var msg _MSG
-		ret, _, err := syscall.Syscall6(getMessage, 4, uintptr(unsafe.Pointer(&msg)), 0, 0, 0, 0, 0)
+		s, _, err := syscall.Syscall6(getMessage, 4, uintptr(unsafe.Pointer(&msg)), 0, 0, 0, 0, 0)
-		if int32(ret) == -1 {
+		if int32(s) == -1 {
 			return err
 		}
-		if ret == 0 {
+		if s == 0 {
 			return nil
 		}
 
-		ret, _, _ = syscall.Syscall(isDialogMessage, 2, wnd, uintptr(unsafe.Pointer(&msg)), 0)
+		s, _, _ = syscall.Syscall(isDialogMessage, 2, wnd, uintptr(unsafe.Pointer(&msg)), 0)
-		if ret == 0 {
+		if s == 0 {
 			syscall.Syscall(translateMessage, 1, uintptr(unsafe.Pointer(&msg)), 0, 0)
 			syscall.Syscall(dispatchMessage, 1, uintptr(unsafe.Pointer(&msg)), 0, 0)
 		}
 	}
 }
 
+// https://stackoverflow.com/questions/4308503/how-to-enable-visual-styles-without-a-manifest
+func enableVisualStyles() (cookie uintptr) {
+	var dir [260]uint16
+	n, _, _ := getSystemDirectory.Call(uintptr(unsafe.Pointer(&dir[0])), uintptr(len(dir)))
+	if n == 0 || int(n) >= len(dir) {
+		return
+	}
+
+	var ctx _ACTCTX
+	ctx.Size = uint32(unsafe.Sizeof(ctx))
+	ctx.Flags = 0x01c // ACTCTX_FLAG_RESOURCE_NAME_VALID|ACTCTX_FLAG_SET_PROCESS_DEFAULT|ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID
+	ctx.Source = syscall.StringToUTF16Ptr("shell32.dll")
+	ctx.AssemblyDirectory = &dir[0]
+	ctx.ResourceName = 124
+
+	if h, _, _ := createActCtx.Call(uintptr(unsafe.Pointer(&ctx))); h != 0 {
+		activateActCtx.Call(h, uintptr(unsafe.Pointer(&cookie)))
+	}
+	return
+}
+
+// https://docs.microsoft.com/en-us/windows/win32/api/winbase/ns-winbase-actctxw
+type _ACTCTX struct {
+	Size                  uint32
+	Flags                 uint32
+	Source                *uint16
+	ProcessorArchitecture uint16
+	LangId                uint16
+	AssemblyDirectory     *uint16
+	ResourceName          uintptr
+	ApplicationName       *uint16
+	Module                uintptr
+}
+
+// https://docs.microsoft.com/en-us/windows/win32/api/commctrl/ns-commctrl-initcommoncontrolsex
+type _INITCOMMONCONTROLSEX struct {
+	Size uint32
+	ICC  uint32
+}
+
 // https://docs.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-cwpretstruct
 type _CWPRETSTRUCT struct {
 	Result  uintptr

zenity.go

@@ -13,14 +13,22 @@ package zenity
 import (
 	"context"
 	"image/color"
+
+	"github.com/ncruces/zenity/internal/zenutil"
 )
 
-type stringErr string
-
-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 = zenutil.ErrCanceled
+
+// ErrExtraButton is returned when the extra button is pressed.
+const ErrExtraButton = zenutil.ErrExtraButton
+
+// ErrUnsupported is returned when a combination of options is not supported.
+const ErrUnsupported = zenutil.ErrUnsupported
+
 type options struct {
 	// General options
 	title       *string
@@ -57,6 +65,11 @@ type options struct {
 	color       color.Color
 	showPalette bool
 
+	// Progress indication options
+	maxValue      int
+	noCancel      bool
+	timeRemaining bool
+
 	// Context for timeout
 	ctx context.Context
 }