Add RGB API support

Signed-off-by: Fatih Arslan <ftharsln@gmail.com>

README.md

@@ -9,7 +9,7 @@ suits you.
 
 ## Install
 
-```bash
+```
 go get github.com/fatih/color
 ```
 
@@ -30,6 +30,18 @@ color.Magenta("And many others ..")
 
 ```
 
+### RGB colors
+
+If your terminal supports 24-bit colors, you can use RGB color codes
+
+```go
+color.RGB(255, 128, 0).Println("foreground orange")
+color.RGB(230, 42, 42).Println("foreground red")
+
+color.BgRGB(255, 128, 0).Println("background orange")
+color.BgRGB(230, 42, 42).Println("background red")
+```
+
 ### Mix and reuse colors
 
 ```go
@@ -49,6 +61,11 @@ boldRed.Println("This will print text in bold red.")
 
 whiteBackground := red.Add(color.BgWhite)
 whiteBackground.Println("Red text with white background.")
+
+// Mix with RGB color codes
+color.RGB(255, 128, 0).AddBgRGB(0, 0, 0).Println("orange with black background")
+
+color.BgRGB(255, 128, 0).AddRGB(255, 255, 255).Println("orange background with white foreground")
 ```
 
 ### Use your own output (io.Writer)

color.go

@@ -98,6 +98,9 @@ const (
 	FgMagenta
 	FgCyan
 	FgWhite
+
+	// used internally for 256 and 24bit coloring
+	foreground
 )
 
 // Foreground Hi-Intensity text colors
@@ -122,6 +125,9 @@ const (
 	BgMagenta
 	BgCyan
 	BgWhite
+
+	// used internally for 256 and 24bit coloring
+	background
 )
 
 // Background Hi-Intensity text colors
@@ -150,6 +156,30 @@ func New(value ...Attribute) *Color {
 	return c
 }
 
+// RGB returns a newly created foreground 24-bit RGB color.
+func RGB(r, g, b int) *Color {
+	return New(foreground, 2, Attribute(r), Attribute(g), Attribute(b))
+}
+
+// BgRGB returns a newly created 24-bit background RGB color.
+func BgRGB(r, g, b int) *Color {
+	return New(background, 2, Attribute(r), Attribute(g), Attribute(b))
+}
+
+// AddRGB is used to chain foreground RGB SGR parameters. Use as many as parameters to combine
+// and create custom color objects. Example: .Add(34, 0, 12).Add(255, 128, 0).
+func (c *Color) AddRGB(r, g, b int) *Color {
+	c.params = append(c.params, foreground, 2, Attribute(r), Attribute(g), Attribute(b))
+	return c
+}
+
+// AddRGB is used to chain background RGB SGR parameters. Use as many as parameters to combine
+// and create custom color objects. Example: .Add(34, 0, 12).Add(255, 128, 0).
+func (c *Color) AddBgRGB(r, g, b int) *Color {
+	c.params = append(c.params, background, 2, Attribute(r), Attribute(g), Attribute(b))
+	return c
+}
+
 // Set sets the given parameters immediately. It will change the color of
 // output with the given SGR parameters until color.Unset() is called.
 func Set(p ...Attribute) *Color {

color_test.go

@@ -471,17 +471,17 @@ func readRaw(t *testing.T, r io.Reader) string {
 }
 
 func TestIssue206_1(t *testing.T) {
-	//visual test, go test -v .
+	// visual test, go test -v .
-	//to  see the string with escape codes, use go test -v . > c:\temp\test.txt
+	// to  see the string with escape codes, use go test -v . > c:\temp\test.txt
-	var underline = New(Underline).Sprint
+	underline := New(Underline).Sprint
 
-	var line = fmt.Sprintf("%s %s %s %s", "word1", underline("word2"), "word3", underline("word4"))
+	line := fmt.Sprintf("%s %s %s %s", "word1", underline("word2"), "word3", underline("word4"))
 
 	line = CyanString(line)
 
 	fmt.Println(line)
 
-	var result = fmt.Sprintf("%v", line)
+	result := fmt.Sprintf("%v", line)
 	const expectedResult = "\x1b[36mword1 \x1b[4mword2\x1b[24m word3 \x1b[4mword4\x1b[24m\x1b[0m"
 
 	if !bytes.Equal([]byte(result), []byte(expectedResult)) {
@@ -490,14 +490,14 @@ func TestIssue206_1(t *testing.T) {
 }
 
 func TestIssue206_2(t *testing.T) {
-	var underline = New(Underline).Sprint
+	underline := New(Underline).Sprint
-	var bold = New(Bold).Sprint
+	bold := New(Bold).Sprint
 
-	var line = fmt.Sprintf("%s %s", GreenString(underline("underlined regular green")), RedString(bold("bold red")))
+	line := fmt.Sprintf("%s %s", GreenString(underline("underlined regular green")), RedString(bold("bold red")))
 
 	fmt.Println(line)
 
-	var result = fmt.Sprintf("%v", line)
+	result := fmt.Sprintf("%v", line)
 	const expectedResult = "\x1b[32m\x1b[4munderlined regular green\x1b[24m\x1b[0m \x1b[31m\x1b[1mbold red\x1b[22m\x1b[0m"
 
 	if !bytes.Equal([]byte(result), []byte(expectedResult)) {
@@ -512,7 +512,7 @@ func TestIssue218(t *testing.T) {
 	c := New(FgCyan)
 	c.Println(params...)
 
-	var result = c.Sprintln(params...)
+	result := c.Sprintln(params...)
 	fmt.Println(params...)
 	fmt.Print(result)
 
@@ -535,3 +535,21 @@ func TestIssue218(t *testing.T) {
 		t.Errorf("Fprintln: Expecting %v (%v), got '%v (%v)'\n", expectedResult, []byte(expectedResult), result, []byte(result))
 	}
 }
+
+func TestRGB(t *testing.T) {
+	tests := []struct {
+		r, g, b int
+	}{
+		{255, 128, 0}, // orange
+		{230, 42, 42}, // red
+	}
+
+	for i, tt := range tests {
+		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
+			RGB(tt.r, tt.g, tt.b).Println("foreground")
+			RGB(tt.r, tt.g, tt.b).AddBgRGB(0, 0, 0).Println("with background")
+			BgRGB(tt.r, tt.g, tt.b).Println("background")
+			BgRGB(tt.r, tt.g, tt.b).AddRGB(255, 255, 255).Println("with foreground")
+		})
+	}
+}