Refactoring.

cmd/zenity/main.go

@@ -49,8 +49,8 @@ var (
 	fileFilters      FileFilters
 
 	// Color selection options
-	initColor string
+	defaultColor string
-	palette   bool
+	showPalette  bool
 
 	// Windows specific options
 	cygpath bool
@@ -130,8 +130,8 @@ func setupFlags() {
 	flag.Var(&fileFilters, "file-filter", "Set a filename filter (NAME | PATTERN1 PATTERN2 ...)")
 
 	// Color selection options
-	flag.StringVar(&initColor, "color", "", "Set the color")
+	flag.StringVar(&defaultColor, "color", "", "Set the color")
-	flag.BoolVar(&palette, "show-palette", false, "Show the palette")
+	flag.BoolVar(&showPalette, "show-palette", false, "Show the palette")
 
 	// Windows specific options
 	if runtime.GOOS == "windows" {
@@ -203,7 +203,7 @@ func loadFlags() []zenity.Option {
 
 	// File selection options
 
-	options = append(options, fileFilters.Build())
+	options = append(options, fileFilters)
 	if filename != "" {
 		options = append(options, zenity.Filename(ingestPath(filename)))
 	}
@@ -224,10 +224,10 @@ func loadFlags() []zenity.Option {
 
 	// Color selection options
 
-	if initColor != "" {
+	if defaultColor != "" {
-		options = append(options, zenity.Color(zenutil.ParseColor(initColor)))
+		options = append(options, zenity.Color(zenutil.ParseColor(defaultColor)))
 	}
-	if palette {
+	if showPalette {
 		options = append(options, zenity.ShowPalette())
 	}
 

color.go

@@ -13,10 +13,10 @@ func SelectColor(options ...Option) (color.Color, error) {
 
 // Color returns an Option to set the color.
 func Color(c color.Color) Option {
-	return func(o *options) { o.color = c }
+	return funcOption(func(o *options) { o.color = c })
 }
 
 // ShowPalette returns an Option to show the palette.
 func ShowPalette() Option {
-	return func(o *options) { o.palette = true }
+	return funcOption(func(o *options) { o.showPalette = true })
 }

color_darwin.go

@@ -8,7 +8,7 @@ import (
 )
 
 func selectColor(options ...Option) (color.Color, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	var data zenutil.Color
 	if opts.color != nil {

color_unix.go

@@ -10,7 +10,7 @@ import (
 )
 
 func selectColor(options ...Option) (color.Color, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	args := []string{"--color-selection"}
 
@@ -20,7 +20,7 @@ func selectColor(options ...Option) (color.Color, error) {
 	if opts.color != nil {
 		args = append(args, "--color", zenutil.UnparseColor(opts.color))
 	}
-	if opts.palette {
+	if opts.showPalette {
 		args = append(args, "--show-palette")
 	}
 

color_windows.go

@@ -21,7 +21,7 @@ func init() {
 }
 
 func selectColor(options ...Option) (color.Color, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	// load custom colors
 	colorsMutex.Lock()
@@ -37,7 +37,7 @@ func selectColor(options ...Option) (color.Color, error) {
 		n := color.NRGBAModel.Convert(opts.color).(color.NRGBA)
 		args.RgbResult = uint32(n.R) | (uint32(n.G) << 8) | (uint32(n.B) << 16)
 	}
-	if opts.palette {
+	if opts.showPalette {
 		args.Flags |= 4 // CC_PREVENTFULLOPEN
 	} else {
 		args.Flags |= 2 // CC_FULLOPEN

file.go

@@ -39,32 +39,32 @@ func SelectFileSave(options ...Option) (string, error) {
 // Specifying a file name, makes it the default selected file.
 // Specifying a directory path, makes it the default dialog location.
 func Filename(filename string) Option {
-	return func(o *options) { o.filename = filename }
+	return funcOption(func(o *options) { o.filename = filename })
 }
 
 // Directory returns an Option to activate directory-only selection.
 func Directory() Option {
-	return func(o *options) { o.directory = true }
+	return funcOption(func(o *options) { o.directory = true })
 }
 
 // ConfirmOverwrite returns an Option to confirm file selection if filename
 // already exists.
 func ConfirmOverwrite() Option {
-	return func(o *options) { o.overwrite = true }
+	return funcOption(func(o *options) { o.confirmOverwrite = true })
 }
 
 // ConfirmCreate returns an Option to confirm file selection if filename does
 // not yet exist (Windows only).
 func ConfirmCreate() Option {
-	return func(o *options) { o.create = true }
+	return funcOption(func(o *options) { o.confirmCreate = true })
 }
 
 // ShowHidden returns an Option to show hidden files (Windows and macOS only).
 func ShowHidden() Option {
-	return func(o *options) { o.hidden = true }
+	return funcOption(func(o *options) { o.showHidden = true })
 }
 
-// FileFilter encapsulates a filename filter.
+// FileFilter is an Option that sets a filename filter.
 //
 // macOS hides filename filters from the user,
 // and only supports filtering by extension (or "type").
@@ -73,17 +73,15 @@ type FileFilter struct {
 	Patterns []string // filter patterns for the display string
 }
 
-// Build returns an Option to set a filename filter.
+func (f FileFilter) apply(o *options) {
-func (f FileFilter) Build() Option {
+	o.fileFilters = append(o.fileFilters, f)
-	return func(o *options) { o.filters = append(o.filters, f) }
 }
 
-// FileFilters is a list of filename filters.
+// FileFilters is an Option that sets multiple filename filters.
 type FileFilters []FileFilter
 
-// Build returns an Option to set filename filters.
+func (f FileFilters) apply(o *options) {
-func (f FileFilters) Build() Option {
+	o.fileFilters = append(o.fileFilters, f...)
-	return func(o *options) { o.filters = append(o.filters, f...) }
 }
 
 func splitDirAndName(path string) (dir, name string) {

file_darwin.go

@@ -8,17 +8,17 @@ import (
 )
 
 func selectFile(options ...Option) (string, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	data := zenutil.File{
 		Prompt:     opts.title,
-		Invisibles: opts.hidden,
+		Invisibles: opts.showHidden,
 	}
 	if opts.directory {
 		data.Operation = "chooseFolder"
 	} else {
 		data.Operation = "chooseFile"
-		data.Type = initFilters(opts.filters)
+		data.Type = initFilters(opts.fileFilters)
 	}
 	data.Location, _ = splitDirAndName(opts.filename)
 
@@ -36,11 +36,11 @@ func selectFile(options ...Option) (string, error) {
 }
 
 func selectFileMutiple(options ...Option) ([]string, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	data := zenutil.File{
 		Prompt:     opts.title,
-		Invisibles: opts.hidden,
+		Invisibles: opts.showHidden,
 		Multiple:   true,
 		Separator:  zenutil.Separator,
 	}
@@ -48,7 +48,7 @@ func selectFileMutiple(options ...Option) ([]string, error) {
 		data.Operation = "chooseFolder"
 	} else {
 		data.Operation = "chooseFile"
-		data.Type = initFilters(opts.filters)
+		data.Type = initFilters(opts.fileFilters)
 	}
 	data.Location, _ = splitDirAndName(opts.filename)
 
@@ -69,7 +69,7 @@ func selectFileMutiple(options ...Option) ([]string, error) {
 }
 
 func selectFileSave(options ...Option) (string, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	data := zenutil.File{
 		Prompt: opts.title,
@@ -78,7 +78,7 @@ func selectFileSave(options ...Option) (string, error) {
 		data.Operation = "chooseFolder"
 	} else {
 		data.Operation = "chooseFileName"
-		data.Type = initFilters(opts.filters)
+		data.Type = initFilters(opts.fileFilters)
 	}
 	data.Location, data.Name = splitDirAndName(opts.filename)
 

file_test.go

@@ -12,7 +12,7 @@ func ExampleSelectFile() {
 			{"Go files", []string{"*.go"}},
 			{"Web files", []string{"*.html", "*.js", "*.css"}},
 			{"Image files", []string{"*.png", "*.gif", "*.ico", "*.jpg", "*.webp"}},
-		}.Build())
+		})
 	// Output:
 }
 
@@ -23,7 +23,7 @@ func ExampleSelectFileMutiple() {
 			{"Go files", []string{"*.go"}},
 			{"Web files", []string{"*.html", "*.js", "*.css"}},
 			{"Image files", []string{"*.png", "*.gif", "*.ico", "*.jpg", "*.webp"}},
-		}.Build())
+		})
 	// Output:
 }
 
@@ -35,7 +35,7 @@ func ExampleSelectFileSave() {
 			{"Go files", []string{"*.go"}},
 			{"Web files", []string{"*.html", "*.js", "*.css"}},
 			{"Image files", []string{"*.png", "*.gif", "*.ico", "*.jpg", "*.webp"}},
-		}.Build())
+		})
 	// Output:
 }
 

file_unix.go

@@ -10,7 +10,7 @@ import (
 )
 
 func selectFile(options ...Option) (string, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	args := []string{"--file-selection"}
 	if opts.directory {
@@ -22,7 +22,7 @@ func selectFile(options ...Option) (string, error) {
 	if opts.filename != "" {
 		args = append(args, "--filename", opts.filename)
 	}
-	args = append(args, initFilters(opts.filters)...)
+	args = append(args, initFilters(opts.fileFilters)...)
 
 	out, err := zenutil.Run(args)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {
@@ -38,7 +38,7 @@ func selectFile(options ...Option) (string, error) {
 }
 
 func selectFileMutiple(options ...Option) ([]string, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	args := []string{"--file-selection", "--multiple", "--separator", zenutil.Separator}
 	if opts.directory {
@@ -50,7 +50,7 @@ func selectFileMutiple(options ...Option) ([]string, error) {
 	if opts.filename != "" {
 		args = append(args, "--filename", opts.filename)
 	}
-	args = append(args, initFilters(opts.filters)...)
+	args = append(args, initFilters(opts.fileFilters)...)
 
 	out, err := zenutil.Run(args)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {
@@ -66,7 +66,7 @@ func selectFileMutiple(options ...Option) ([]string, error) {
 }
 
 func selectFileSave(options ...Option) (string, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	args := []string{"--file-selection", "--save"}
 	if opts.directory {
@@ -78,10 +78,10 @@ func selectFileSave(options ...Option) (string, error) {
 	if opts.filename != "" {
 		args = append(args, "--filename", opts.filename)
 	}
-	if opts.overwrite {
+	if opts.confirmOverwrite {
 		args = append(args, "--confirm-overwrite")
 	}
-	args = append(args, initFilters(opts.filters)...)
+	args = append(args, initFilters(opts.fileFilters)...)
 
 	out, err := zenutil.Run(args)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {

file_windows.go

@@ -18,7 +18,7 @@ var (
 )
 
 func selectFile(options ...Option) (string, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 	if opts.directory {
 		res, _, err := pickFolders(opts, false)
 		return res, err
@@ -31,11 +31,11 @@ func selectFile(options ...Option) (string, error) {
 	if opts.title != "" {
 		args.Title = syscall.StringToUTF16Ptr(opts.title)
 	}
-	if opts.hidden {
+	if opts.showHidden {
 		args.Flags |= 0x10000000 // OFN_FORCESHOWHIDDEN
 	}
-	if opts.filters != nil {
+	if opts.fileFilters != nil {
-		args.Filter = &initFilters(opts.filters)[0]
+		args.Filter = &initFilters(opts.fileFilters)[0]
 	}
 
 	res := [32768]uint16{}
@@ -54,7 +54,7 @@ func selectFile(options ...Option) (string, error) {
 }
 
 func selectFileMutiple(options ...Option) ([]string, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 	if opts.directory {
 		_, res, err := pickFolders(opts, true)
 		return res, err
@@ -67,11 +67,11 @@ func selectFileMutiple(options ...Option) ([]string, error) {
 	if opts.title != "" {
 		args.Title = syscall.StringToUTF16Ptr(opts.title)
 	}
-	if opts.hidden {
+	if opts.showHidden {
 		args.Flags |= 0x10000000 // OFN_FORCESHOWHIDDEN
 	}
-	if opts.filters != nil {
+	if opts.fileFilters != nil {
-		args.Filter = &initFilters(opts.filters)[0]
+		args.Filter = &initFilters(opts.fileFilters)[0]
 	}
 
 	res := [32768 + 1024*256]uint16{}
@@ -115,7 +115,7 @@ func selectFileMutiple(options ...Option) ([]string, error) {
 }
 
 func selectFileSave(options ...Option) (string, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 	if opts.directory {
 		res, _, err := pickFolders(opts, false)
 		return res, err
@@ -128,17 +128,17 @@ func selectFileSave(options ...Option) (string, error) {
 	if opts.title != "" {
 		args.Title = syscall.StringToUTF16Ptr(opts.title)
 	}
-	if opts.overwrite {
+	if opts.confirmOverwrite {
 		args.Flags |= 0x2 // OFN_OVERWRITEPROMPT
 	}
-	if opts.create {
+	if opts.confirmCreate {
 		args.Flags |= 0x2000 // OFN_CREATEPROMPT
 	}
-	if opts.hidden {
+	if opts.showHidden {
 		args.Flags |= 0x10000000 // OFN_FORCESHOWHIDDEN
 	}
-	if opts.filters != nil {
+	if opts.fileFilters != nil {
-		args.Filter = &initFilters(opts.filters)[0]
+		args.Filter = &initFilters(opts.fileFilters)[0]
 	}
 
 	res := [32768]uint16{}
@@ -185,7 +185,7 @@ func pickFolders(opts options, multi bool) (str string, lst []string, err error)
 	if multi {
 		flgs |= 0x200 // FOS_ALLOWMULTISELECT
 	}
-	if opts.hidden {
+	if opts.showHidden {
 		flgs |= 0x10000000 // FOS_FORCESHOWHIDDEN
 	}
 	hr, _, _ = dialog.Call(dialog.vtbl.SetOptions, uintptr(flgs|0x68)) // FOS_NOCHANGEDIR|FOS_PICKFOLDERS|FOS_FORCEFILESYSTEM

msg.go

@@ -63,35 +63,35 @@ const (
 
 // Icon returns an Option to set the dialog icon.
 func Icon(icon MessageIcon) Option {
-	return func(o *options) { o.icon = icon }
+	return funcOption(func(o *options) { o.icon = icon })
 }
 
 // OKLabel returns an Option to set the label of the OK button.
 func OKLabel(ok string) Option {
-	return func(o *options) { o.ok = ok }
+	return funcOption(func(o *options) { o.okLabel = ok })
 }
 
 // CancelLabel returns an Option to set the label of the Cancel button.
 func CancelLabel(cancel string) Option {
-	return func(o *options) { o.cancel = cancel }
+	return funcOption(func(o *options) { o.cancelLabel = cancel })
 }
 
 // ExtraButton returns an Option to add an extra button.
 func ExtraButton(extra string) Option {
-	return func(o *options) { o.extra = extra }
+	return funcOption(func(o *options) { o.extraButton = extra })
 }
 
 // NoWrap returns an Option to disable enable text wrapping.
 func NoWrap() Option {
-	return func(o *options) { o.nowrap = true }
+	return funcOption(func(o *options) { o.noWrap = true })
 }
 
 // Ellipsize returns an Option to enable ellipsizing in the dialog text.
 func Ellipsize() Option {
-	return func(o *options) { o.ellipsize = true }
+	return funcOption(func(o *options) { o.ellipsize = true })
 }
 
 // DefaultCancel returns an Option to give Cancel button focus by default.
 func DefaultCancel() Option {
-	return func(o *options) { o.defcancel = true }
+	return funcOption(func(o *options) { o.defaultCancel = true })
 }

msg_darwin.go

@@ -7,7 +7,7 @@ import (
 )
 
 func message(kind messageKind, text string, options []Option) (bool, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 	data := zenutil.Msg{Text: text}
 	dialog := kind == questionKind || opts.icon != 0
 
@@ -42,39 +42,39 @@ func message(kind messageKind, text string, options []Option) (bool, error) {
 
 	if kind != questionKind {
 		if dialog {
-			opts.ok = "OK"
+			opts.okLabel = "OK"
 		}
-		opts.cancel = ""
+		opts.cancelLabel = ""
 	}
-	if opts.ok != "" || opts.cancel != "" || opts.extra != "" {
+	if opts.okLabel != "" || opts.cancelLabel != "" || opts.extraButton != "" {
-		if opts.ok == "" {
+		if opts.okLabel == "" {
-			opts.ok = "OK"
+			opts.okLabel = "OK"
 		}
-		if opts.cancel == "" {
+		if opts.cancelLabel == "" {
-			opts.cancel = "Cancel"
+			opts.cancelLabel = "Cancel"
 		}
 		if kind == questionKind {
-			if opts.extra == "" {
+			if opts.extraButton == "" {
-				data.Buttons = []string{opts.cancel, opts.ok}
+				data.Buttons = []string{opts.cancelLabel, opts.okLabel}
 				data.Default = 2
 				data.Cancel = 1
 			} else {
-				data.Buttons = []string{opts.extra, opts.cancel, opts.ok}
+				data.Buttons = []string{opts.extraButton, opts.cancelLabel, opts.okLabel}
 				data.Default = 3
 				data.Cancel = 2
 			}
 		} else {
-			if opts.extra == "" {
+			if opts.extraButton == "" {
-				data.Buttons = []string{opts.ok}
+				data.Buttons = []string{opts.okLabel}
 				data.Default = 1
 			} else {
-				data.Buttons = []string{opts.extra, opts.ok}
+				data.Buttons = []string{opts.extraButton, opts.okLabel}
 				data.Default = 2
 			}
 		}
-		data.Extra = opts.extra
+		data.Extra = opts.extraButton
 	}
-	if opts.defcancel {
+	if opts.defaultCancel {
 		if data.Cancel != 0 {
 			data.Default = data.Cancel
 		}
@@ -90,7 +90,7 @@ func message(kind messageKind, text string, options []Option) (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	if len(out) > 0 && string(out[:len(out)-1]) == opts.extra {
+	if len(out) > 0 && string(out[:len(out)-1]) == opts.extraButton {
 		return false, ErrExtraButton
 	}
 	return true, err

msg_unix.go

@@ -9,7 +9,7 @@ import (
 )
 
 func message(kind messageKind, text string, options []Option) (bool, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	var args []string
 	switch kind {
@@ -28,22 +28,22 @@ func message(kind messageKind, text string, options []Option) (bool, error) {
 	if opts.title != "" {
 		args = append(args, "--title", opts.title)
 	}
-	if opts.ok != "" {
+	if opts.okLabel != "" {
-		args = append(args, "--ok-label", opts.ok)
+		args = append(args, "--ok-label", opts.okLabel)
 	}
-	if opts.cancel != "" {
+	if opts.cancelLabel != "" {
-		args = append(args, "--cancel-label", opts.cancel)
+		args = append(args, "--cancel-label", opts.cancelLabel)
 	}
-	if opts.extra != "" {
+	if opts.extraButton != "" {
-		args = append(args, "--extra-button", opts.extra)
+		args = append(args, "--extra-button", opts.extraButton)
 	}
-	if opts.nowrap {
+	if opts.noWrap {
 		args = append(args, "--no-wrap")
 	}
 	if opts.ellipsize {
 		args = append(args, "--ellipsize")
 	}
-	if opts.defcancel {
+	if opts.defaultCancel {
 		args = append(args, "--default-cancel")
 	}
 	switch opts.icon {
@@ -59,7 +59,7 @@ func message(kind messageKind, text string, options []Option) (bool, error) {
 
 	out, err := zenutil.Run(args)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {
-		if len(out) > 0 && string(out[:len(out)-1]) == opts.extra {
+		if len(out) > 0 && string(out[:len(out)-1]) == opts.extraButton {
 			return false, ErrExtraButton
 		}
 		return false, nil

msg_windows.go

@@ -11,14 +11,14 @@ var (
 )
 
 func message(kind messageKind, text string, options []Option) (bool, error) {
-	opts := optsParse(options)
+	opts := applyOptions(options)
 
 	var flags, caption uintptr
 
 	switch {
-	case kind == questionKind && opts.extra != "":
+	case kind == questionKind && opts.extraButton != "":
 		flags |= 0x3 // MB_YESNOCANCEL
-	case kind == questionKind || opts.extra != "":
+	case kind == questionKind || opts.extraButton != "":
 		flags |= 0x1 // MB_OKCANCEL
 	}
 
@@ -33,8 +33,8 @@ func message(kind messageKind, text string, options []Option) (bool, error) {
 		flags |= 0x40 // MB_ICONINFORMATION
 	}
 
-	if kind == questionKind && opts.defcancel {
+	if kind == questionKind && opts.defaultCancel {
-		if opts.extra == "" {
+		if opts.extraButton == "" {
 			flags |= 0x100 // MB_DEFBUTTON2
 		} else {
 			flags |= 0x200 // MB_DEFBUTTON3
@@ -45,7 +45,7 @@ func message(kind messageKind, text string, options []Option) (bool, error) {
 		caption = uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(opts.title)))
 	}
 
-	if opts.ok != "" || opts.cancel != "" || opts.extra != "" {
+	if opts.okLabel != "" || opts.cancelLabel != "" || opts.extraButton != "" {
 		runtime.LockOSThread()
 		defer runtime.UnlockOSThread()
 
@@ -89,17 +89,17 @@ func hookMessageLabels(kind messageKind, opts options) (hook uintptr, err error)
 								var text string
 								switch ctl {
 								case 1, 6: // IDOK, IDYES
-									text = opts.ok
+									text = opts.okLabel
 								case 2: // IDCANCEL
 									if kind == questionKind {
-										text = opts.cancel
+										text = opts.cancelLabel
-									} else if opts.extra != "" {
+									} else if opts.extraButton != "" {
-										text = opts.extra
+										text = opts.extraButton
 									} else {
-										text = opts.ok
+										text = opts.okLabel
 									}
 								case 7: // IDNO
-									text = opts.extra
+									text = opts.extraButton
 								}
 								if text != "" {
 									ptr := syscall.StringToUTF16Ptr(text)

zenity.go

@@ -21,39 +21,45 @@ type options struct {
 	title string
 
 	// File selection options
-	filename  string
+	filename         string
-	directory bool
+	directory        bool
-	overwrite bool
+	confirmOverwrite bool
-	create    bool
+	confirmCreate    bool
-	hidden    bool
+	showHidden       bool
-	filters   []FileFilter
+	fileFilters      []FileFilter
 
 	// Color selection options
-	color   color.Color
+	color       color.Color
-	palette bool
+	showPalette bool
 
 	// Message options
-	icon      MessageIcon
+	icon          MessageIcon
-	ok        string
+	okLabel       string
-	cancel    string
+	cancelLabel   string
-	extra     string
+	extraButton   string
-	nowrap    bool
+	noWrap        bool
-	ellipsize bool
+	ellipsize     bool
-	defcancel bool
+	defaultCancel bool
 }
 
 // An Option is an argument passed to dialog functions to customize their
 // behavior.
-type Option func(*options)
+type Option interface {
+	apply(*options)
+}
 
-func optsParse(options []Option) (res options) {
+type funcOption func(*options)
+
+func (f funcOption) apply(o *options) { f(o) }
+
+func applyOptions(options []Option) (res options) {
 	for _, o := range options {
-		o(&res)
+		o.apply(&res)
 	}
 	return
 }
 
 // Title returns an Option to set the dialog title.
 func Title(title string) Option {
-	return func(o *options) { o.title = title }
+	return funcOption(func(o *options) { o.title = title })
 }