diff --git a/README.md b/README.md
index f07862a..3c98483 100644
--- a/README.md
+++ b/README.md
@@ -34,8 +34,9 @@ Why reinvent this particular wheel?
   * Unicode support
   * WSL/Cygwin/MSYS2 [support](https://github.com/ncruces/zenity/wiki/Zenity-for-WSL,-Cygwin,-MSYS2)
 * on macOS:
-  * only dependency is `osascript` (with [JXA](https://developer.apple.com/library/archive/releasenotes/InterapplicationCommunication/RN-JavaScriptForAutomation/Articles/Introduction.html))\
-    JavaScript is easier to template (with `html/template`)
+  * only dependency is `osascript`
+    (with [JXA](https://developer.apple.com/library/archive/releasenotes/InterapplicationCommunication/RN-JavaScriptForAutomation/Articles/Introduction.html);
+    `html/template` makes JavaScript easy to template)
 * on other Unixes:
   * wraps either one of `qarma`, `zenity`, `matedialog`,\
     in that order of preference
diff --git a/cmd/zenity/main.go b/cmd/zenity/main.go
index d7eb84d..2dca13a 100644
--- a/cmd/zenity/main.go
+++ b/cmd/zenity/main.go
@@ -9,7 +9,7 @@ import (
 	"strings"
 
 	"github.com/ncruces/zenity"
-	"github.com/ncruces/zenity/internal/cmd"
+	"github.com/ncruces/zenity/internal/zenutil"
 )
 
 //go:generate go run github.com/josephspurrier/goversioninfo/cmd/goversioninfo -platform-specific -manifest=win.manifest
@@ -56,7 +56,7 @@ func main() {
 	flag.Parse()
 	validateFlags()
 	opts := loadFlags()
-	cmd.Command = true
+	zenutil.Command = true
 
 	switch {
 	case errorDlg:
@@ -201,7 +201,7 @@ func loadFlags() []zenity.Option {
 		options = append(options, zenity.ShowHidden())
 	}
 
-	cmd.Separator = separator
+	zenutil.Separator = separator
 
 	return options
 }
@@ -209,12 +209,12 @@ func loadFlags() []zenity.Option {
 func msgResult(ok bool, err error) {
 	if err == zenity.ErrExtraButton {
 		os.Stdout.WriteString(extraButton)
-		os.Stdout.WriteString(cmd.LineBreak)
+		os.Stdout.WriteString(zenutil.LineBreak)
 		os.Exit(1)
 	}
 	if err != nil {
 		os.Stderr.WriteString(err.Error())
-		os.Stderr.WriteString(cmd.LineBreak)
+		os.Stderr.WriteString(zenutil.LineBreak)
 		os.Exit(-1)
 	}
 	if ok {
@@ -226,25 +226,25 @@ func msgResult(ok bool, err error) {
 func strResult(s string, err error) {
 	if err != nil {
 		os.Stderr.WriteString(err.Error())
-		os.Stderr.WriteString(cmd.LineBreak)
+		os.Stderr.WriteString(zenutil.LineBreak)
 		os.Exit(-1)
 	}
 	if s == "" {
 		os.Exit(1)
 	}
 	os.Stdout.WriteString(s)
-	os.Stdout.WriteString(cmd.LineBreak)
+	os.Stdout.WriteString(zenutil.LineBreak)
 	os.Exit(0)
 }
 
 func lstResult(l []string, err error) {
 	if err != nil {
 		os.Stderr.WriteString(err.Error())
-		os.Stderr.WriteString(cmd.LineBreak)
+		os.Stderr.WriteString(zenutil.LineBreak)
 		os.Exit(-1)
 	}
 	os.Stdout.WriteString(strings.Join(l, separator))
-	os.Stdout.WriteString(cmd.LineBreak)
+	os.Stdout.WriteString(zenutil.LineBreak)
 	if l == nil {
 		os.Exit(1)
 	}
diff --git a/color_darwin.go b/color_darwin.go
index 686ee09..de76781 100644
--- a/color_darwin.go
+++ b/color_darwin.go
@@ -4,25 +4,24 @@ import (
 	"image/color"
 	"os/exec"
 
-	"github.com/ncruces/zenity/internal/osa"
-	"github.com/ncruces/zenity/internal/zen"
+	"github.com/ncruces/zenity/internal/zenutil"
 )
 
 func SelectColor(options ...Option) (color.Color, error) {
 	opts := optsParse(options)
 
-	var data osa.Color
+	var data zenutil.Color
 	if opts.color != nil {
 		r, g, b, _ := opts.color.RGBA()
 		data.Color = []float32{float32(r) / 0xffff, float32(g) / 0xffff, float32(b) / 0xffff}
 	}
 
-	out, err := osa.Run("color", data)
+	out, err := zenutil.Run("color", data)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
 		return nil, nil
 	}
 	if err != nil {
 		return nil, err
 	}
-	return zen.ParseColor(string(out)), nil
+	return zenutil.ParseColor(string(out)), nil
 }
diff --git a/file_darwin.go b/file_darwin.go
index e8463f8..565ff98 100644
--- a/file_darwin.go
+++ b/file_darwin.go
@@ -4,14 +4,13 @@ import (
 	"os/exec"
 	"strings"
 
-	"github.com/ncruces/zenity/internal/cmd"
-	"github.com/ncruces/zenity/internal/osa"
+	"github.com/ncruces/zenity/internal/zenutil"
 )
 
 func SelectFile(options ...Option) (string, error) {
 	opts := optsParse(options)
 
-	data := osa.File{
+	data := zenutil.File{
 		Prompt:     opts.title,
 		Invisibles: opts.hidden,
 	}
@@ -23,7 +22,7 @@ func SelectFile(options ...Option) (string, error) {
 	}
 	data.Location, _ = splitDirAndName(opts.filename)
 
-	out, err := osa.Run("file", data)
+	out, err := zenutil.Run("file", data)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
 		return "", nil
 	}
@@ -39,11 +38,11 @@ func SelectFile(options ...Option) (string, error) {
 func SelectFileMutiple(options ...Option) ([]string, error) {
 	opts := optsParse(options)
 
-	data := osa.File{
+	data := zenutil.File{
 		Prompt:     opts.title,
 		Invisibles: opts.hidden,
 		Multiple:   true,
-		Separator:  cmd.Separator,
+		Separator:  zenutil.Separator,
 	}
 	if opts.directory {
 		data.Operation = "chooseFolder"
@@ -53,7 +52,7 @@ func SelectFileMutiple(options ...Option) ([]string, error) {
 	}
 	data.Location, _ = splitDirAndName(opts.filename)
 
-	out, err := osa.Run("file", data)
+	out, err := zenutil.Run("file", data)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
 		return nil, nil
 	}
@@ -66,13 +65,13 @@ func SelectFileMutiple(options ...Option) ([]string, error) {
 	if len(out) == 0 {
 		return nil, nil
 	}
-	return strings.Split(string(out), cmd.Separator), nil
+	return strings.Split(string(out), zenutil.Separator), nil
 }
 
 func SelectFileSave(options ...Option) (string, error) {
 	opts := optsParse(options)
 
-	data := osa.File{
+	data := zenutil.File{
 		Prompt: opts.title,
 	}
 	if opts.directory {
@@ -83,7 +82,7 @@ func SelectFileSave(options ...Option) (string, error) {
 	}
 	data.Location, data.Name = splitDirAndName(opts.filename)
 
-	out, err := osa.Run("file", data)
+	out, err := zenutil.Run("file", data)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
 		return "", nil
 	}
diff --git a/file_unix.go b/file_unix.go
index 5498814..a51228a 100644
--- a/file_unix.go
+++ b/file_unix.go
@@ -6,8 +6,7 @@ import (
 	"os/exec"
 	"strings"
 
-	"github.com/ncruces/zenity/internal/cmd"
-	"github.com/ncruces/zenity/internal/zen"
+	"github.com/ncruces/zenity/internal/zenutil"
 )
 
 // Display file selection dialog.
@@ -30,7 +29,7 @@ func SelectFile(options ...Option) (string, error) {
 	}
 	args = append(args, initFilters(opts.filters)...)
 
-	out, err := zen.Run(args)
+	out, err := zenutil.Run(args)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {
 		return "", nil
 	}
@@ -51,7 +50,7 @@ func SelectFile(options ...Option) (string, error) {
 func SelectFileMutiple(options ...Option) ([]string, error) {
 	opts := optsParse(options)
 
-	args := []string{"--file-selection", "--multiple", "--separator", cmd.Separator}
+	args := []string{"--file-selection", "--multiple", "--separator", zenutil.Separator}
 	if opts.directory {
 		args = append(args, "--directory")
 	}
@@ -63,7 +62,7 @@ func SelectFileMutiple(options ...Option) ([]string, error) {
 	}
 	args = append(args, initFilters(opts.filters)...)
 
-	out, err := zen.Run(args)
+	out, err := zenutil.Run(args)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {
 		return nil, nil
 	}
@@ -73,7 +72,7 @@ func SelectFileMutiple(options ...Option) ([]string, error) {
 	if len(out) > 0 {
 		out = out[:len(out)-1]
 	}
-	return strings.Split(string(out), cmd.Separator), nil
+	return strings.Split(string(out), zenutil.Separator), nil
 }
 
 // Display save file selection dialog.
@@ -99,7 +98,7 @@ func SelectFileSave(options ...Option) (string, error) {
 	}
 	args = append(args, initFilters(opts.filters)...)
 
-	out, err := zen.Run(args)
+	out, err := zenutil.Run(args)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() != 255 {
 		return "", nil
 	}
diff --git a/go.sum b/go.sum
index 9760eff..90284fd 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,4 @@
 golang.org/x/image v0.0.0-20191214001246-9130b4cfad52 h1:2fktqPPvDiVEEVT/vSTeoUPXfmRxRaGy6GU8jypvEn0=
 golang.org/x/image v0.0.0-20191214001246-9130b4cfad52/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/internal/osa/generate.go b/internal/osa/generate.go
deleted file mode 100644
index 774ea8d..0000000
--- a/internal/osa/generate.go
+++ /dev/null
@@ -1,3 +0,0 @@
-package osa
-
-//go:generate go run generator.go scripts/
diff --git a/internal/zen/color.go b/internal/zenutil/color.go
similarity index 98%
rename from internal/zen/color.go
rename to internal/zenutil/color.go
index 68e8d92..2c8011b 100644
--- a/internal/zen/color.go
+++ b/internal/zenutil/color.go
@@ -1,4 +1,4 @@
-package zen
+package zenutil
 
 import (
 	"fmt"
diff --git a/internal/cmd/cmd_darwin.go b/internal/zenutil/env_darwin.go
similarity index 80%
rename from internal/cmd/cmd_darwin.go
rename to internal/zenutil/env_darwin.go
index 7d8d806..097179b 100644
--- a/internal/cmd/cmd_darwin.go
+++ b/internal/zenutil/env_darwin.go
@@ -1,4 +1,4 @@
-package cmd
+package zenutil
 
 const LineBreak = "\n"
 
diff --git a/internal/cmd/cmd_unix.go b/internal/zenutil/env_unix.go
similarity index 85%
rename from internal/cmd/cmd_unix.go
rename to internal/zenutil/env_unix.go
index d905bd8..977b44a 100644
--- a/internal/cmd/cmd_unix.go
+++ b/internal/zenutil/env_unix.go
@@ -1,6 +1,6 @@
 // +build !windows,!darwin
 
-package cmd
+package zenutil
 
 const LineBreak = "\n"
 
diff --git a/internal/cmd/cmd_windows.go b/internal/zenutil/env_windows.go
similarity index 80%
rename from internal/cmd/cmd_windows.go
rename to internal/zenutil/env_windows.go
index e3235fc..3e2fa2c 100644
--- a/internal/cmd/cmd_windows.go
+++ b/internal/zenutil/env_windows.go
@@ -1,4 +1,4 @@
-package cmd
+package zenutil
 
 const LineBreak = "\r\n"
 
diff --git a/internal/zenutil/osa_generate.go b/internal/zenutil/osa_generate.go
new file mode 100644
index 0000000..0bcc980
--- /dev/null
+++ b/internal/zenutil/osa_generate.go
@@ -0,0 +1,3 @@
+package zenutil
+
+//go:generate go run osa_generator.go osascripts/
diff --git a/internal/osa/generated.go b/internal/zenutil/osa_generated.go
similarity index 99%
rename from internal/osa/generated.go
rename to internal/zenutil/osa_generated.go
index ab02535..57e0038 100644
--- a/internal/osa/generated.go
+++ b/internal/zenutil/osa_generated.go
@@ -1,7 +1,7 @@
 // Code generated by zenity; DO NOT EDIT.
 // +build darwin
 
-package osa
+package zenutil
 
 import "html/template"
 
diff --git a/internal/osa/generator.go b/internal/zenutil/osa_generator.go
similarity index 95%
rename from internal/osa/generator.go
rename to internal/zenutil/osa_generator.go
index fb3cfdc..f0bb274 100644
--- a/internal/osa/generator.go
+++ b/internal/zenutil/osa_generator.go
@@ -52,7 +52,7 @@ func main() {
 		str.WriteString("</script>{{end}}")
 	}
 
-	out, err := os.Create("generated.go")
+	out, err := os.Create("osa_generated.go")
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -71,7 +71,7 @@ func main() {
 var generator = template.Must(template.New("").Parse(`// Code generated by zenity; DO NOT EDIT.
 // +build darwin
 
-package osa
+package zenutil
 
 import "html/template"
 
diff --git a/internal/osa/scripts/color.gots b/internal/zenutil/osascripts/color.gots
similarity index 100%
rename from internal/osa/scripts/color.gots
rename to internal/zenutil/osascripts/color.gots
diff --git a/internal/osa/scripts/file.gots b/internal/zenutil/osascripts/file.gots
similarity index 100%
rename from internal/osa/scripts/file.gots
rename to internal/zenutil/osascripts/file.gots
diff --git a/internal/osa/scripts/msg.gots b/internal/zenutil/osascripts/msg.gots
similarity index 100%
rename from internal/osa/scripts/msg.gots
rename to internal/zenutil/osascripts/msg.gots
diff --git a/internal/osa/run_darwin.go b/internal/zenutil/run_darwin.go
similarity index 93%
rename from internal/osa/run_darwin.go
rename to internal/zenutil/run_darwin.go
index f9c0b9b..a574092 100644
--- a/internal/osa/run_darwin.go
+++ b/internal/zenutil/run_darwin.go
@@ -1,12 +1,10 @@
-package osa
+package zenutil
 
 import (
 	"os"
 	"os/exec"
 	"strings"
 	"syscall"
-
-	"github.com/ncruces/zenity/internal/cmd"
 )
 
 func Run(script string, data interface{}) ([]byte, error) {
@@ -20,7 +18,7 @@ func Run(script string, data interface{}) ([]byte, error) {
 	res := buf.String()
 	res = res[len("<script>") : len(res)-len("\n</script>")]
 
-	if cmd.Command {
+	if Command {
 		path, err := exec.LookPath("osascript")
 		if err == nil {
 			os.Stderr.Close()
diff --git a/internal/zen/run_unix.go b/internal/zenutil/run_unix.go
similarity index 82%
rename from internal/zen/run_unix.go
rename to internal/zenutil/run_unix.go
index cc5c0ff..22b6f39 100644
--- a/internal/zen/run_unix.go
+++ b/internal/zenutil/run_unix.go
@@ -1,13 +1,11 @@
 // +build !windows,!darwin
 
-package zen
+package zenutil
 
 import (
 	"os"
 	"os/exec"
 	"syscall"
-
-	"github.com/ncruces/zenity/internal/cmd"
 )
 
 var tool, path string
@@ -23,7 +21,7 @@ func init() {
 }
 
 func Run(args []string) ([]byte, error) {
-	if cmd.Command && path != "" {
+	if Command && path != "" {
 		syscall.Exec(path, append([]string{tool}, args...), os.Environ())
 	}
 	return exec.Command(tool, args...).Output()
diff --git a/msg_darwin.go b/msg_darwin.go
index f7195ee..ae55bff 100644
--- a/msg_darwin.go
+++ b/msg_darwin.go
@@ -3,7 +3,7 @@ package zenity
 import (
 	"os/exec"
 
-	"github.com/ncruces/zenity/internal/osa"
+	"github.com/ncruces/zenity/internal/zenutil"
 )
 
 func Question(text string, options ...Option) (bool, error) {
@@ -24,7 +24,7 @@ func Error(text string, options ...Option) (bool, error) {
 
 func message(typ int, text string, options []Option) (bool, error) {
 	opts := optsParse(options)
-	data := osa.Msg{Text: text}
+	data := zenutil.Msg{Text: text}
 	dialog := typ == 0 || opts.icon != 0
 
 	if dialog {
@@ -99,7 +99,7 @@ func message(typ int, text string, options []Option) (bool, error) {
 		}
 	}
 
-	out, err := osa.Run("msg", data)
+	out, err := zenutil.Run("msg", data)
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
 		return false, nil
 	}
diff --git a/msg_unix.go b/msg_unix.go
index b9071dc..a4a79aa 100644
--- a/msg_unix.go
+++ b/msg_unix.go
@@ -5,7 +5,7 @@ package zenity
 import (
 	"os/exec"
 
-	"github.com/ncruces/zenity/internal/zen"
+	"github.com/ncruces/zenity/internal/zenutil"
 )
 
 // Display question dialog.
@@ -84,7 +84,7 @@ func message(arg, text string, options []Option) (bool, error) {
 		args = append(args, "--icon-name=dialog-question")
 	}
 
-	out, err := zen.Run(args)
+	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 {
 			return false, ErrExtraButton