Color dialog (macos).

color_darwin.go

@@ -0,0 +1,28 @@
+package zenity
+
+import (
+	"image/color"
+	"os/exec"
+
+	"github.com/ncruces/zenity/internal/osa"
+	"github.com/ncruces/zenity/internal/zen"
+)
+
+func SelectColor(options ...Option) (color.Color, error) {
+	opts := optsParse(options)
+
+	var data osa.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)
+	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
+}

go.mod

@@ -1,3 +1,5 @@
 module github.com/ncruces/zenity
 
 go 1.13
+
+require golang.org/x/image v0.0.0-20191214001246-9130b4cfad52

go.sum

@@ -0,0 +1,3 @@
+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/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

internal/osa/generated.go

@@ -6,6 +6,21 @@ package osa
 import "html/template"
 
 var scripts = template.Must(template.New("").Parse(`
+{{define "color"}}<script>var app = Application.currentApplication()
+app.includeStandardAdditions = true
+app.activate()
+var opts = {}
+{{if .Color -}}
+opts.defaultColor = {{.Color}}
+{{end -}}
+var res = app.chooseColor(opts)
+if (Array.isArray(res)) {
+res[0] = Math.round(255*res[0])
+res[1] = Math.round(255*res[1])
+res[2] = Math.round(255*res[2])
+'rgb('+res+')'
+}
+</script>{{end}}
 {{define "file"}}<script>var app = Application.currentApplication()
 app.includeStandardAdditions = true
 app.activate()

internal/osa/run_darwin.go

@@ -44,6 +44,10 @@ type File struct {
 	Multiple   bool
 }
 
+type Color struct {
+	Color []float32
+}
+
 type Msg struct {
 	Operation string
 	Text      string

internal/osa/scripts/color.gots

@@ -0,0 +1,17 @@
+var app = Application.currentApplication()
+app.includeStandardAdditions = true
+app.activate()
+
+var opts = {}
+
+{{if .Color -}}
+	opts.defaultColor = {{.Color}}
+{{end -}}
+
+var res = app.chooseColor(opts)
+if (Array.isArray(res)) {
+	res[0] = Math.round(255*res[0])
+	res[1] = Math.round(255*res[1])
+	res[2] = Math.round(255*res[2])
+	'rgb('+res+')'
+}

internal/zen/color.go

@@ -0,0 +1,44 @@
+package zen
+
+import (
+	"fmt"
+	"image/color"
+	"strings"
+
+	"golang.org/x/image/colornames"
+)
+
+func ParseColor(s string) color.Color {
+	if len(s) == 4 || len(s) == 5 {
+		c := color.NRGBA{A: 0xf}
+		n, _ := fmt.Sscanf(s, "#%1x%1x%1x%1x", &c.R, &c.G, &c.B, &c.A)
+		c.R, c.G, c.B, c.A = c.R*0x11, c.G*0x11, c.B*0x11, c.A*0x11
+		if n >= 3 {
+			return c
+		}
+	}
+
+	if len(s) == 7 || len(s) == 9 {
+		c := color.NRGBA{A: 0xff}
+		n, _ := fmt.Sscanf(s, "#%02x%02x%02x%02x", &c.R, &c.G, &c.B, &c.A)
+		if n >= 3 {
+			return c
+		}
+	}
+
+	if len(s) >= 10 {
+		c := color.NRGBA{A: 0xff}
+		if _, err := fmt.Sscanf(s, "rgb(%d,%d,%d)\n", &c.R, &c.G, &c.B); err == nil {
+			return c
+		}
+
+		var a float32
+		if _, err := fmt.Sscanf(s, "rgba(%d,%d,%d,%f)\n", &c.R, &c.G, &c.B, &a); err == nil {
+			c.A = uint8(255*a + 0.5)
+			return c
+		}
+	}
+
+	c, _ := colornames.Map[strings.ToLower(s)]
+	return c
+}