diff --git a/cmd_alpha.go b/cmd_alpha.go
index 841fd7f..e7e1a64 100644
--- a/cmd_alpha.go
+++ b/cmd_alpha.go
@@ -5,8 +5,9 @@ package vvin
 
 import (
 	"errors"
+	"os"
 
-	"github.com/shu-go/rog"
+	"github.com/shu-go/nmfmt"
 )
 
 type alphaCmd struct {
@@ -14,19 +15,22 @@ type alphaCmd struct {
 
 func (c alphaCmd) Run(args []string, g globalCmd) error {
 	if len(args) != 1 {
-		return errors.New("an argument is required")
+		return errors.New("an argument (opacity; 0%-100% or 0-255) is required")
 	}
 
-	alpha := toInt(args[0], 255)
-	if g.Debug {
-		rog.Printf("alpha = %v -> %v", args[0], alpha)
-	}
+	opacity := toInt(args[0], 255)
+
+	g.debug(os.Stderr, "opacity $=arg:q -> $opacity/255\n",
+		nmfmt.M{
+			"arg":     args[0],
+			"opacity": opacity,
+		})
 
 	style, _, _ := getWindowLong.Call(uintptr(g.targetHandle), gwlEXStyle)
 	setWindowLong.Call(uintptr(g.targetHandle), gwlEXStyle, style|wsEXLayered)
 
-	setLayeredWindowAttributes.Call(uintptr(g.targetHandle), 0, uintptr(alpha), lwaAlpha)
-	if alpha == 255 {
+	setLayeredWindowAttributes.Call(uintptr(g.targetHandle), 0, uintptr(opacity), lwaAlpha)
+	if opacity == 255 {
 		setWindowLong.Call(uintptr(g.targetHandle), gwlEXStyle, style&^wsEXLayered)
 	}
 
diff --git a/cmd_resize.go b/cmd_resize.go
index db6195e..3729355 100644
--- a/cmd_resize.go
+++ b/cmd_resize.go
@@ -5,9 +5,10 @@ package vvin
 
 import (
 	"errors"
+	"os"
 	"unsafe"
 
-	"github.com/shu-go/rog"
+	"github.com/shu-go/nmfmt"
 )
 
 type resizeCmd struct {
@@ -32,9 +33,11 @@ func (c *resizeCmd) Before(g globalCmd) error {
 
 	oldrect := c.rect
 
-	if g.Debug {
-		rog.Print(oldrect)
-	}
+	g.debug(os.Stderr, "$=original\n",
+		nmfmt.M{
+			"original": oldrect,
+		})
+
 	if c.Left != "" {
 		c.rect.Left = toInt(c.Left, g.scrWidth)
 	}
@@ -51,12 +54,11 @@ func (c *resizeCmd) Before(g globalCmd) error {
 	} else {
 		c.rect.Bottom = c.rect.Top + (oldrect.Bottom - oldrect.Top)
 	}
-	if g.Debug {
-		if c.Restore {
-			rog.Print("restore")
-		} else {
-			rog.Print(c.rect)
-		}
+
+	if c.Restore {
+		g.debug(os.Stderr, "restore\n")
+	} else {
+		g.debug(os.Stderr, "resized $rect\n", nmfmt.M{"rect": c.rect})
 	}
 
 	return nil
diff --git a/cmd_wait.go b/cmd_wait.go
index 31174c4..935a28a 100644
--- a/cmd_wait.go
+++ b/cmd_wait.go
@@ -12,16 +12,14 @@ import (
 	"strings"
 	"syscall"
 	"time"
-
-	"github.com/shu-go/gli"
 )
 
 type waitCmd struct {
 	_ struct{} `help:"[--close] {Title}"`
 
-	Closed   bool         `help:"wait until the window is closed"`
-	Interval gli.Duration `cli:"interval,i=DURATION" default:"1s"`
-	Timeout  gli.Duration `cli:"timeout=DURATION" default:"0s" help:"zelo value means ininite"`
+	Closed   bool          `help:"wait until the window is closed"`
+	Interval time.Duration `cli:"interval,i=DURATION" default:"1s"`
+	Timeout  time.Duration `cli:"timeout=DURATION" default:"0s" help:"zero value means ininite"`
 }
 
 func (c waitCmd) Run(args []string) error {
@@ -33,10 +31,13 @@ func (c waitCmd) Run(args []string) error {
 	t := strings.ToLower(args[0])
 
 	var ctx context.Context
+	var cancel func()
+
 	if c.Timeout == 0 {
 		ctx = context.Background()
+		cancel = func() {}
 	} else {
-		ctx, _ = context.WithTimeout(context.Background(), c.Timeout.Duration())
+		ctx, cancel = context.WithTimeout(context.Background(), c.Timeout)
 	}
 
 	signalChan := make(chan os.Signal, 1)
@@ -48,6 +49,7 @@ waitLoop:
 	for {
 		wins, err := listAllWindows()
 		if err != nil {
+			cancel()
 			return err
 		}
 
@@ -67,14 +69,15 @@ waitLoop:
 			fmt.Fprintln(os.Stderr, "cancelled")
 			break waitLoop
 		case <-ctx.Done():
-			fmt.Fprintln(os.Stderr, "cancelled")
+			fmt.Fprintln(os.Stderr, "cancelled (timeout)")
 			break waitLoop
 		default:
 			//nop
 		}
 
-		time.Sleep(c.Interval.Duration())
+		time.Sleep(c.Interval)
 	}
+	cancel()
 
 	return nil
 }
diff --git a/go.mod b/go.mod
index a39f4b6..1093841 100644
--- a/go.mod
+++ b/go.mod
@@ -1,9 +1,16 @@
-module git.bigun.dev/evan/vvin
+module github.com/shu-go/vvin
 
-go 1.13
+go 1.21
 
 require (
 	github.com/mitchellh/go-ps v1.0.0
-	github.com/shu-go/gli v1.5.7
-	github.com/shu-go/rog v0.1.0
+	github.com/shu-go/gli/v2 v2.0.1
+	github.com/shu-go/nmfmt v0.1.0
+)
+
+require (
+	github.com/mattn/go-runewidth v0.0.15 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/rivo/uniseg v0.4.4 // indirect
+	github.com/shu-go/cliparser v0.2.2 // indirect
 )
diff --git a/go.sum b/go.sum
index 3101dbc..190f621 100644
--- a/go.sum
+++ b/go.sum
@@ -1,22 +1,17 @@
-github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
-github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
-github.com/mattn/go-runewidth v0.0.14/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
-github.com/mitchellh/go-ps v0.0.0-20190716172923-621e5597135b h1:9+ke9YJ9KGWw5ANXK6ozjoK47uI3uNbXv4YVINBnGm8=
-github.com/mitchellh/go-ps v0.0.0-20190716172923-621e5597135b/go.mod h1:r1VsdOzOPt1ZSrGZWFoNhsAedKnEd6r9Np1+5blZCWk=
+github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
+github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/mitchellh/go-ps v1.0.0 h1:i6ampVEEF4wQFF+bkYfwYgY+F/uYJDktmvLPf7qIgjc=
 github.com/mitchellh/go-ps v1.0.0/go.mod h1:J4lOc8z8yJs6vUwklHw2XEIiT4z4C40KtWVN3nvg8Pg=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
-github.com/rivo/uniseg v0.4.3/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
-github.com/shu-go/cliparser v0.2.1 h1:09Nqe/SBmHr00DAQM3JxkVnSCBkGf8P5+7EtHWVndh0=
-github.com/shu-go/cliparser v0.2.1/go.mod h1:oX+xgwUi9B2OzBFudKc5ayoqWhlVAbuN67rAqyWvvQ4=
+github.com/rivo/uniseg v0.4.4 h1:8TfxU8dW6PdqD27gjM8MVNuicgxIjxpm4K7x4jp8sis=
+github.com/rivo/uniseg v0.4.4/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
+github.com/shu-go/cliparser v0.2.2 h1:EONHyGHC+9l2mukTBNsxvngXro73T22kXb+agVFd0CY=
 github.com/shu-go/cliparser v0.2.2/go.mod h1:oX+xgwUi9B2OzBFudKc5ayoqWhlVAbuN67rAqyWvvQ4=
-github.com/shu-go/clise v0.0.0-20190822023516-79849fb81cfe/go.mod h1:VLiMEzXMBozBLD37i3id3qPflaupus48v/979ipQ43s=
-github.com/shu-go/gli v1.5.2 h1:sn15ZBwgy3cAhMQc3+5IhTzCZxi3kuESVPfP3D7qJ8E=
-github.com/shu-go/gli v1.5.2/go.mod h1:3m4JxIHbLp5yx2LgyKOj8cqN2IcJC0slhZB6mewmlvI=
-github.com/shu-go/gli v1.5.7/go.mod h1:WZSG6NFYr/1rwT2F3Oms0gWyklvjJNDW6qvBfZ/tM4U=
+github.com/shu-go/gli/v2 v2.0.1 h1:XA1QSfUdpWW1FIqLjuXo+Gs/IjEy+uviuxKQ45IRYC8=
+github.com/shu-go/gli/v2 v2.0.1/go.mod h1:pSC0XKb69hEarQpiQU74CNiKpcS7a90iJAMUGL3SinQ=
 github.com/shu-go/gotwant v0.0.0-20190920074605-b4f19c0bac91 h1:nwDc3kHbf9scf1UZIWiWw5tZF3Z4yOJAMjNN+kYXJwE=
 github.com/shu-go/gotwant v0.0.0-20190920074605-b4f19c0bac91/go.mod h1:FZepfqvib0mXjHiaQPTv0RUD5QMpMA/FHLfBQjZRRQg=
-github.com/shu-go/rog v0.1.0 h1:mplglNOiUN1ujq0UTkosB5NL/GQhFX2gRYcen7aEhTY=
-github.com/shu-go/rog v0.1.0/go.mod h1:gO+FpqgnHoxbF6FPJN6PaAEl6hcZRLNL+nQZgbbElzo=
+github.com/shu-go/nmfmt v0.1.0 h1:gL5u0yiIsegh2gofeNUpAJPWCNgOF+qIivBc9qO/KoE=
+github.com/shu-go/nmfmt v0.1.0/go.mod h1:ulgNf0sfuQEEdX2cM71sGviSEKDf9DUXlm5WtFn0PJY=
diff --git a/vvin.go b/vvin.go
index d7fc0a5..660dde4 100644
--- a/vvin.go
+++ b/vvin.go
@@ -1,11 +1,9 @@
-//go:build windows
-// +build windows
-
-package vvin
+package main
 
 import (
 	"errors"
 	"fmt"
+	"io"
 	"math"
 	"os"
 	"strconv"
@@ -14,13 +12,19 @@ import (
 	"unsafe"
 
 	"github.com/mitchellh/go-ps"
-	"github.com/shu-go/gli"
+	"github.com/shu-go/gli/v2"
+	"github.com/shu-go/nmfmt"
 )
 
+// Version is app version
+var Version string
+
 type globalCmd struct {
 	Target string `cli:"target,t=WINDOW_TITLE" help:"default to current window"`
 	Debug  bool   `help:"output debug info"`
 
+	debug func(io.Writer, string, ...any) (int, error) // nmfmt
+
 	Minimize minCmd     `cli:"minimize,min" help:"minimize/restore"`
 	Maximize maxCmd     `cli:"maximize,max" help:"maximize/restore"`
 	Resize   resizeCmd  `cli:"resize,move,mv" help:"resize/move"`
@@ -30,11 +34,18 @@ type globalCmd struct {
 
 	targetHandle syscall.Handle
 
-	scrWidth, scrHeight     int
-	frameWidth, frameHeight int
+	scrWidth, scrHeight int
 }
 
 func (c *globalCmd) Before() error {
+	c.debug = func(io.Writer, string, ...any) (int, error) {
+		return 0, nil
+	}
+	if c.Debug {
+		c.debug = nmfmt.Fprintf
+	}
+	c.debug(os.Stderr, "Debug enabled.\n")
+
 	wins, err := listAllWindows()
 	if err != nil {
 		return err
@@ -46,6 +57,12 @@ func (c *globalCmd) Before() error {
 	}
 	c.targetHandle = win.Handle
 
+	c.debug(os.Stderr, "$=target:q -> $=handle:x\n",
+		nmfmt.M{
+			"target": c.Target,
+			"handle": c.targetHandle,
+		})
+
 	w, _, _ := getSystemMetrics.Call(smCXVirtualScreen)
 	h, _, _ := getSystemMetrics.Call(smCYVirtualScreen)
 	c.scrWidth = int(w)
@@ -54,15 +71,17 @@ func (c *globalCmd) Before() error {
 	return nil
 }
 
-func Start(args []string) error {
+func main() {
 	app := gli.NewWith(&globalCmd{})
 	app.Name = "vvin"
 	app.Desc = "Change window properties for Windows"
-	app.Version = "0.8.0"
+	app.Version = Version
 	app.Usage = ``
 	app.Copyright = "(C) 2019 Shuhei Kubota"
 	app.SuppressErrorOutput = true
-	return app.Run(args)
+	if err := app.Run(os.Args); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+	}
 }
 
 var (
@@ -112,8 +131,8 @@ const (
 	hwndTopmost   = ^uintptr(0)
 	hwndNoTopmost = ^uintptr(1)
 
-	spiGetAnimation = 0x0048
-	spiSetAnimation = 0x0049
+	//spiGetAnimation = 0x0048
+	//spiSetAnimation = 0x0049
 )
 
 type (
@@ -126,11 +145,6 @@ type (
 	rect struct {
 		Left, Top, Right, Bottom int32
 	}
-
-	anmationinfo struct {
-		Size    uint32
-		Animate int32
-	}
 )
 
 func listAllWindows() (wins []*window, err error) {