Allow hex theme colors

docs/Config.md

@@ -252,7 +252,8 @@ os:
 For color attributes you can choose an array of attributes (with max one color attribute)
 The available attributes are:
 
-- default
+**Colors**
+
 - black
 - red
 - green
@@ -261,7 +262,12 @@ The available attributes are:
 - magenta
 - cyan
 - white
+- '#ff00ff' # can't be used on text
+
+**Modifiers**
+
 - bold
+- default
 - reverse # useful for high-contrast
 - underline
 

pkg/theme/theme.go

@@ -1,6 +1,8 @@
 package theme
 
 import (
+	"encoding/hex"
+
 	"github.com/fatih/color"
 	"github.com/jesseduffield/gocui"
 	"github.com/jesseduffield/lazygit/pkg/config"
@@ -59,8 +61,33 @@ func UpdateTheme(themeConfig config.ThemeConfig) {
 	}
 }
 
+// getHexColorValues returns the rgb values of a hex color
+func getHexColorValues(v string) (r int32, g int32, b int32, valid bool) {
+	if len(v) == 4 {
+		v = string([]byte{v[0], v[1], v[1], v[2], v[2], v[3], v[3]})
+	} else if len(v) != 7 {
+		return
+	}
+
+	if v[0] != '#' {
+		return
+	}
+
+	rgb, err := hex.DecodeString(v[1:])
+	if err != nil {
+		return
+	}
+
+	return int32(rgb[0]), int32(rgb[1]), int32(rgb[2]), true
+}
+
 // GetAttribute gets the gocui color attribute from the string
 func GetGocuiAttribute(key string) gocui.Attribute {
+	r, g, b, validHexColor := getHexColorValues(key)
+	if validHexColor {
+		return gocui.NewRGBColor(r, g, b)
+	}
+
 	colorMap := map[string]gocui.Attribute{
 		"default":   gocui.ColorDefault,
 		"black":     gocui.ColorBlack,

pkg/theme/theme_test.go

@@ -0,0 +1,63 @@
+package theme
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetHexColorValues(t *testing.T) {
+	scenarios := []struct {
+		name     string
+		hexColor string
+		rgb      []int32
+		valid    bool
+	}{
+		{
+			name:     "valid uppercase hex color",
+			hexColor: "#00FF00",
+			rgb:      []int32{0, 255, 0},
+			valid:    true,
+		},
+		{
+			name:     "valid lowercase hex color",
+			hexColor: "#00ff00",
+			rgb:      []int32{0, 255, 0},
+			valid:    true,
+		},
+		{
+			name:     "valid short hex color",
+			hexColor: "#0bf",
+			rgb:      []int32{0, 187, 255},
+			valid:    true,
+		},
+		{
+			name:     "invalid hex value",
+			hexColor: "#zz00ff",
+			valid:    false,
+		},
+		{
+			name:     "invalid length hex color",
+			hexColor: "#",
+			valid:    false,
+		},
+		{
+			name:     "invalid length hex color",
+			hexColor: "#aaaaaaaaaaa",
+			valid:    false,
+		},
+	}
+
+	for _, s := range scenarios {
+		s := s
+		t.Run(s.name, func(t *testing.T) {
+			r, g, b, valid := getHexColorValues(s.hexColor)
+			assert.EqualValues(t, s.valid, valid, s.hexColor)
+			if valid {
+				assert.EqualValues(t, s.rgb[0], r, s.hexColor)
+				assert.EqualValues(t, s.rgb[1], g, s.hexColor)
+				assert.EqualValues(t, s.rgb[2], b, s.hexColor)
+			}
+		})
+	}
+}