Support CSS named colors

color.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 
 	"github.com/lucasb-eyer/go-colorful"
+	"github.com/muesli/gamut/palette"
 )
 
 var (
@@ -35,6 +36,10 @@ type ANSI256Color int
 // RGBColor is a hex-encoded color, e.g. "#abcdef".
 type RGBColor string
 
+// CSSNamedColor is a color as defined by the CSS color standards, e.g. "red".
+// Colors are supported through CSS Color Module Level 4.
+type CSSNamedColor string
+
 func ConvertToRGB(c Color) colorful.Color {
 	var hex string
 	switch v := c.(type) {
@@ -91,6 +96,8 @@ func (p Profile) Color(s string) Color {
 	var c Color
 	if strings.HasPrefix(s, "#") {
 		c = RGBColor(s)
+	} else if _, ok := palette.CSS.Color(s); ok {
+		c = CSSNamedColor(s)
 	} else {
 		i, err := strconv.Atoi(s)
 		if err != nil {
@@ -152,6 +159,21 @@ func (c RGBColor) Sequence(bg bool) string {
 	return fmt.Sprintf("%s;2;%d;%d;%d", prefix, uint8(f.R*255), uint8(f.G*255), uint8(f.B*255))
 }
 
+func (c CSSNamedColor) Sequence(bg bool) string {
+	f, ok := palette.CSS.Color(string(c))
+	if !ok {
+		return ""
+	}
+
+	r, g, b, _ := f.RGBA()
+
+	prefix := Foreground
+	if bg {
+		prefix = Background
+	}
+	return fmt.Sprintf("%s;2;%d;%d;%d", prefix, uint8(r), uint8(g), uint8(b))
+}
+
 func xTermColor(s string) (RGBColor, error) {
 	if len(s) < 24 || len(s) > 25 {
 		return RGBColor(""), ErrInvalidColor

color_test.go

@@ -1,6 +1,8 @@
 package termenv
 
-import "testing"
+import (
+	"testing"
+)
 
 func TestXTermColor(t *testing.T) {
 	var tests = []struct {
@@ -57,3 +59,26 @@ func TestXTermColor(t *testing.T) {
 		})
 	}
 }
+
+func TestCSSNamedColor(t *testing.T) {
+	var tests = []struct {
+		name     string
+		expected string
+	}{
+		{
+			"red",
+			"38;2;255;0;0",
+		},
+		{
+			"rebeccapurple",
+			"38;2;102;51;153",
+		},
+	}
+
+	for _, test := range tests {
+		res := CSSNamedColor(test.name).Sequence(false)
+		if res != test.expected {
+			t.Fatalf("wrong color returned, want %v, got %v", test.expected, res)
+		}
+	}
+}

go.mod

@@ -6,5 +6,6 @@ require (
 	github.com/lucasb-eyer/go-colorful v1.0.3
 	github.com/mattn/go-isatty v0.0.12
 	github.com/mattn/go-runewidth v0.0.9
+	github.com/muesli/gamut v0.1.3-0.20201204030319-712673bc0c9d
 	golang.org/x/sys v0.0.0-20200116001909-b77594299b42
 )

go.sum

@@ -1,8 +1,28 @@
+github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
+github.com/blend/go-sdk v2.0.0+incompatible h1:FL9X/of4ZYO5D2JJNI4vHrbXPfuSDbUa7h8JP9+E92w=
+github.com/blend/go-sdk v2.0.0+incompatible/go.mod h1:3GUb0YsHFNTJ6hsJTpzdmCUl05o8HisKjx5OAlzYKdw=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/lucasb-eyer/go-colorful v1.0.2/go.mod h1:0MS4r+7BZKSJ5mw4/S5MPN+qHFF1fYclkSPilDOKW0s=
 github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tWFlaaUAac=
 github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
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+github.com/muesli/clusters v0.0.0-20200529215643-2700303c1762/go.mod h1:mw5KDqUj0eLj/6DUNINLVJNoPTFkEuGMHtJsXLviLkY=
+github.com/muesli/gamut v0.1.3-0.20201204030319-712673bc0c9d h1:viLCvENFa2+h6CrVukUcje9+tb/3j5j58AA+R/l+m+c=
+github.com/muesli/gamut v0.1.3-0.20201204030319-712673bc0c9d/go.mod h1:ItWqD/8gN+iyhkOJFN0COXkgeQjKNCOkA8KnojuYI1U=
+github.com/muesli/kmeans v0.0.0-20200718051629-66f1657148c0 h1:xptegMPjfY9TDf49s3E5QFV1dZeA3acCq9IKTGirMLo=
+github.com/muesli/kmeans v0.0.0-20200718051629-66f1657148c0/go.mod h1:+s8P1Egy3DkSU5+p4yBBn9SQQP1RhzZEgLw98DNYljQ=
+github.com/wcharczuk/go-chart v2.0.2-0.20191206192251-962b9abdec2b+incompatible h1:ahpaSRefPekV3gcXot2AOgngIV8WYqzvDyFe3i7W24w=
+github.com/wcharczuk/go-chart v2.0.2-0.20191206192251-962b9abdec2b+incompatible/go.mod h1:PF5tmL4EIx/7Wf+hEkpCqYi5He4u90sw+0+6FhrryuE=
+github.com/xrash/smetrics v0.0.0-20200730060457-89a2a8a1fb0b h1:tnWgqoOBmInkt5pbLjagwNVjjT4RdJhFHzL1ebCSRh8=
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+golang.org/x/image v0.0.0-20190501045829-6d32002ffd75 h1:TbGuee8sSq15Iguxu4deQ7+Bqq/d2rsQejGcEtADAMQ=
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+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=