✨ feat: Color add new method: IsBg(), IsFg(), IsOption() for check color

color_16.go

@@ -41,15 +41,27 @@ func (o Opts) String() string {
  * Basic 16 color definition
  *************************************************************/
 
-// Base value for foreground/background color
-// base: fg 30~37, bg 40~47
-// light: fg 90~97, bg 100~107
+const (
+	// OptMax max option value. range: 0 - 9
+	OptMax = 10
+	// DiffFgBg diff foreground and background color
+	DiffFgBg = 10
+)
+
+// Boundary value for foreground/background color 16
+//
+//   - base: fg 30~37, bg 40~47
+//   - light: fg 90~97, bg 100~107
 const (
 	FgBase uint8 = 30
+	FgMax  uint8 = 37
 	BgBase uint8 = 40
+	BgMax  uint8 = 47
 
 	HiFgBase uint8 = 90
+	HiFgMax  uint8 = 97
 	HiBgBase uint8 = 100
+	HiBgMax  uint8 = 107
 )
 
 // Foreground colors. basic foreground colors 30 - 37
@@ -94,7 +106,7 @@ const (
 	BgDefault Color = 49
 )
 
-// Extra background color 100 - 107(非标准)
+// Extra background color 100 - 107 (non-standard)
 const (
 	BgDarkGray Color = iota + 100
 	BgLightRed
@@ -108,7 +120,7 @@ const (
 	BgGray Color = 100
 )
 
-// Option settings
+// Option settings. range: 0 - 9
 const (
 	OpReset         Color = iota // 0 重置所有设置
 	OpBold                       // 1 加粗
@@ -248,9 +260,9 @@ func (c Color) Println(a ...any) { doPrintlnV2(c.String(), a) }
 //	lightCyan := Cyan.Light()
 //	lightCyan.Print("message")
 func (c Color) Light() Color {
-	val := int(c)
+	val := uint8(c)
 	if val >= 30 && val <= 47 {
-		return Color(uint8(c) + 60)
+		return Color(val + 60)
 	}
 
 	// don't change
@@ -264,9 +276,9 @@ func (c Color) Light() Color {
 //	cyan := LightCyan.Darken()
 //	cyan.Print("message")
 func (c Color) Darken() Color {
-	val := int(c)
+	val := uint8(c)
 	if val >= 90 && val <= 107 {
-		return Color(uint8(c) - 60)
+		return Color(val - 60)
 	}
 
 	// don't change
@@ -324,7 +336,7 @@ func (c Color) RGB() RGBColor {
 		return emptyRGBColor
 	}
 
-	return HEX(Basic2hex(val))
+	return HEX(Basic2hex(val), c.IsBg())
 }
 
 // Code convert to code string. eg "35"
@@ -337,8 +349,23 @@ func (c Color) String() string {
 	return strconv.FormatInt(int64(c), 10)
 }
 
+// IsBg check is background color
+func (c Color) IsBg() bool {
+	val := uint8(c)
+	return val >= BgBase && val <= BgMax || val >= HiBgBase && val <= HiBgMax
+}
+
+// IsFg check is foreground color
+func (c Color) IsFg() bool {
+	val := uint8(c)
+	return val >= FgBase && val <= FgMax || val >= HiFgBase && val <= HiFgMax
+}
+
+// IsOption check is option code: 0-9
+func (c Color) IsOption() bool { return uint8(c) < OptMax }
+
 // IsValid color value
-func (c Color) IsValid() bool { return c < 107 }
+func (c Color) IsValid() bool { return uint8(c) < HiBgMax }
 
 /*************************************************************
  * basic color maps

color_256.go

@@ -43,7 +43,8 @@ const (
  * 8bit(256) Color: Bit8Color Color256
  *************************************************************/
 
-// Color256 256 color (8 bit), uint8 range at 0 - 255
+// Color256 256 color (8 bit), uint8 range at 0 - 255.
+// Support 256 color on windows CMD, PowerShell
 //
 // 颜色值使用10进制和16进制都可 0x98 = 152
 //
@@ -54,10 +55,9 @@ const (
 //
 // example:
 //
-//		fg color: [152, 0]
-//	 bg color: [152, 1]
+//	fg color: [152, 0]
+//	bg color: [152, 1]
 //
-// NOTICE: now support 256 color on windows CMD, PowerShell
 // lint warn - Name starts with package name
 type Color256 [2]uint8
 type Bit8Color = Color256 // alias
@@ -164,9 +164,7 @@ func (c Color256) String() string {
 }
 
 // IsFg color
-func (c Color256) IsFg() bool {
-	return c[1] == AsFg
-}
+func (c Color256) IsFg() bool { return c[1] == AsFg }
 
 // ToFg 256 color
 func (c Color256) ToFg() Color256 {
@@ -175,9 +173,7 @@ func (c Color256) ToFg() Color256 {
 }
 
 // IsBg color
-func (c Color256) IsBg() bool {
-	return c[1] == AsBg
-}
+func (c Color256) IsBg() bool { return c[1] == AsBg }
 
 // ToBg 256 color
 func (c Color256) ToBg() Color256 {
@@ -186,9 +182,7 @@ func (c Color256) ToBg() Color256 {
 }
 
 // IsEmpty value
-func (c Color256) IsEmpty() bool {
-	return c[1] > 1
-}
+func (c Color256) IsEmpty() bool { return c[1] > 1 }
 
 /*************************************************************
  * 8bit(256) Style

color_test.go

@@ -334,6 +334,24 @@ func TestColor16(t *testing.T) {
 	is.True(ok)
 }
 
+func TestColor_check(t *testing.T) {
+	assert.True(t, Cyan.IsValid())
+	assert.True(t, BgCyan.IsValid())
+
+	// is fg
+	assert.True(t, Cyan.IsFg())
+	assert.False(t, BgCyan.IsFg())
+
+	// is bg
+	assert.False(t, Cyan.IsBg())
+	assert.True(t, BgCyan.IsBg())
+
+	// is option
+	assert.False(t, Cyan.IsOption())
+	assert.False(t, BgCyan.IsOption())
+	assert.True(t, Bold.IsOption())
+}
+
 func TestColor_convert(t *testing.T) {
 	assert.Equal(t, "36", Cyan.ToFg().Code())
 	assert.Equal(t, "46", Cyan.ToBg().Code())
@@ -344,6 +362,12 @@ func TestColor_convert(t *testing.T) {
 	assert.Equal(t, "93", BgHiYellow.ToFg().Code())
 	assert.Equal(t, "105", BgHiMagenta.ToBg().Code())
 
+	assert.Equal(t, "104;253;254", HiCyan.RGB().Code())
+	assert.Equal(t, "38;2;104;253;254", HiCyan.RGB().FullCode())
+
+	assert.Equal(t, "104;253;254", HiCyan.ToBg().RGB().Code())
+	assert.Equal(t, "48;2;104;253;254", HiCyan.ToBg().RGB().FullCode())
+
 	assert.Equal(t, "5", OpBlink.ToFg().Code())
 	assert.Equal(t, "5", OpBlink.ToBg().Code())
 }

style.go

@@ -37,7 +37,8 @@ func (s *Style) Add(cs ...Color) {
 	*s = append(*s, cs...)
 }
 
-// Render render text
+// Render colored text
+//
 // Usage:
 //
 //	color.New(color.FgGreen).Render("text")
@@ -46,8 +47,9 @@ func (s Style) Render(a ...any) string {
 	return RenderCode(s.String(), a...)
 }
 
-// Renderln render text line.
+// Renderln render text with newline.
 // like Println, will add spaces for each argument
+//
 // Usage:
 //
 //	color.New(color.FgGreen).Renderln("text", "more")