colorscheme: Add capability to include schemes

internal/config/colorscheme.go

@@ -83,7 +83,8 @@ func LoadColorscheme(colorschemeName string) error {
 // red background
 func ParseColorscheme(text string) (map[string]tcell.Style, error) {
 	var err error
-	parser := regexp.MustCompile(`color-link\s+(\S*)\s+"(.*)"`)
+	colorParser := regexp.MustCompile(`color-link\s+(\S*)\s+"(.*)"`)
+	includeParser := regexp.MustCompile(`include:\s+"(.*)"`)
 
 	lines := strings.Split(text, "\n")
 
@@ -96,7 +97,17 @@ func ParseColorscheme(text string) (map[string]tcell.Style, error) {
 			continue
 		}
 
-		matches := parser.FindSubmatch([]byte(line))
+		matches := includeParser.FindSubmatch([]byte(line))
+		if len(matches) == 2 {
+			include := string(matches[1])
+			err = LoadColorscheme(include)
+			if err == nil {
+				c = Colorscheme
+			}
+			continue
+		}
+
+		matches = colorParser.FindSubmatch([]byte(line))
 		if len(matches) == 3 {
 			link := string(matches[1])
 			colors := string(matches[2])

runtime/colorschemes/default.micro

@@ -1,31 +1 @@
-color-link default "#F8F8F2,#282828"
-color-link comment "#75715E,#282828"
-color-link identifier "#66D9EF,#282828"
-color-link constant "#AE81FF,#282828"
-color-link constant.string "#E6DB74,#282828"
-color-link constant.string.char "#BDE6AD,#282828"
-color-link statement "#F92672,#282828"
-color-link symbol.operator "#F92671,#282828"
-color-link preproc "#CB4B16,#282828"
-color-link type "#66D9EF,#282828"
-color-link special "#A6E22E,#282828"
-color-link underlined "#D33682,#282828"
-color-link error "bold #CB4B16,#282828"
-color-link todo "bold #D33682,#282828"
-color-link hlsearch "#282828,#E6DB74"
-color-link statusline "#282828,#F8F8F2"
-color-link tabbar "#282828,#F8F8F2"
-color-link indent-char "#505050,#282828"
-color-link line-number "#AAAAAA,#323232"
-color-link current-line-number "#AAAAAA,#282828"
-color-link diff-added "#00AF00"
-color-link diff-modified "#FFAF00"
-color-link diff-deleted "#D70000"
-color-link gutter-error "#CB4B16,#282828"
-color-link gutter-warning "#E6DB74,#282828"
-color-link cursor-line "#323232"
-color-link color-column "#323232"
-#No extended types; Plain brackets.
-color-link type.extended "default"
-#color-link symbol.brackets "default"
-color-link symbol.tag "#AE81FF,#282828"
+include: "monokai"

runtime/help/colors.md

@@ -235,7 +235,10 @@ Here's a list of subgroups used in micro's built-in syntax files.
 * type.keyword (If you want a special highlight for keywords like `private`)
 
 In the future, plugins may also be able to use color groups for styling.
-
+Last but not least it's even possible to use `include:` followed by the
+colorscheme name as string to include a different colorscheme within a new one.
+Additionally the groups can then be extended or overwritten. The `default.micro`
+theme can be seen as an example, which links to the chosen default colorscheme.
 
 ## Syntax files