Make dashboard updateable

markdown_editor_highlight.go

@@ -0,0 +1,182 @@
+package main
+
+import (
+	"github.com/alecthomas/chroma/v2"
+	"github.com/alecthomas/chroma/v2/lexers"
+)
+
+type editorMarkdownStyle uint8
+
+const (
+	editorMarkdownPlain editorMarkdownStyle = iota
+	editorMarkdownHeading
+	editorMarkdownStrong
+	editorMarkdownEmphasis
+	editorMarkdownCode
+	editorMarkdownLink
+	editorMarkdownDestination
+	editorMarkdownQuote
+	editorMarkdownComment
+)
+
+func editorMarkdownStyles(value string) []editorMarkdownStyle {
+	runes := []rune(value)
+	styles := make([]editorMarkdownStyle, len(runes))
+	lexer := lexers.Get("markdown")
+	if lexer == nil {
+		highlightEditorHTMLComments(runes, styles)
+		return styles
+	}
+	tokens, err := chroma.Tokenise(lexer, nil, value)
+	if err != nil {
+		highlightEditorHTMLComments(runes, styles)
+		return styles
+	}
+	offset := 0
+	for _, token := range tokens {
+		style := editorMarkdownStyleForToken(token.Type)
+		for range []rune(token.Value) {
+			if offset >= len(styles) {
+				return styles
+			}
+			styles[offset] = style
+			offset++
+		}
+	}
+	highlightEditorHTMLComments(runes, styles)
+	return styles
+}
+
+func highlightEditorHTMLComments(runes []rune, styles []editorMarkdownStyle) {
+	startMarker, endMarker := []rune("<!--"), []rune("-->")
+	for offset := 0; offset < len(runes); {
+		start := findEditorRunes(runes, startMarker, offset)
+		if start < 0 {
+			return
+		}
+		end := findEditorRunes(runes, endMarker, start+len(startMarker))
+		if end < 0 {
+			end = len(runes)
+		} else {
+			end += len(endMarker)
+		}
+		for index := start; index < end; index++ {
+			styles[index] = editorMarkdownComment
+		}
+		offset = end
+	}
+}
+
+func findEditorRunes(value, target []rune, offset int) int {
+	for index := max(0, offset); index+len(target) <= len(value); index++ {
+		matches := true
+		for targetIndex := range target {
+			if value[index+targetIndex] != target[targetIndex] {
+				matches = false
+				break
+			}
+		}
+		if matches {
+			return index
+		}
+	}
+	return -1
+}
+
+func editorMarkdownStyleForToken(token chroma.TokenType) editorMarkdownStyle {
+	switch {
+	case token == chroma.GenericHeading || token == chroma.GenericSubheading:
+		return editorMarkdownHeading
+	case token == chroma.GenericStrong:
+		return editorMarkdownStrong
+	case token == chroma.GenericEmph:
+		return editorMarkdownEmphasis
+	case token == chroma.LiteralStringBacktick:
+		return editorMarkdownCode
+	case token == chroma.NameTag:
+		return editorMarkdownLink
+	case token == chroma.NameAttribute:
+		return editorMarkdownDestination
+	case token == chroma.Keyword:
+		return editorMarkdownQuote
+	case token.InSubCategory(chroma.Comment):
+		return editorMarkdownComment
+	default:
+		return editorMarkdownPlain
+	}
+}
+
+func editorMarkdownStyleStart(style editorMarkdownStyle) string {
+	if style == editorMarkdownPlain {
+		return ""
+	}
+	if currentThemeName == "no-color" {
+		switch style {
+		case editorMarkdownHeading, editorMarkdownStrong:
+			return "\x1b[1m"
+		case editorMarkdownEmphasis:
+			return "\x1b[3m"
+		case editorMarkdownLink:
+			return "\x1b[4m"
+		case editorMarkdownComment:
+			return "\x1b[2m"
+		default:
+			return ""
+		}
+	}
+	if currentThemeName == "light" {
+		switch style {
+		case editorMarkdownHeading:
+			return "\x1b[1;38;2;154;103;0m"
+		case editorMarkdownStrong:
+			return "\x1b[1;38;2;130;80;223m"
+		case editorMarkdownEmphasis:
+			return "\x1b[3;38;2;87;96;106m"
+		case editorMarkdownCode:
+			return "\x1b[38;2;17;99;41m"
+		case editorMarkdownLink:
+			return "\x1b[4;38;2;9;105;218m"
+		case editorMarkdownDestination:
+			return "\x1b[38;2;10;112;111m"
+		case editorMarkdownQuote:
+			return "\x1b[38;2;154;103;0m"
+		case editorMarkdownComment:
+			return "\x1b[2;38;2;101;109;118m"
+		}
+	}
+	switch style {
+	case editorMarkdownHeading:
+		return "\x1b[1;38;2;240;183;47m"
+	case editorMarkdownStrong:
+		return "\x1b[1;38;2;198;120;221m"
+	case editorMarkdownEmphasis:
+		return "\x1b[3;38;2;215;218;232m"
+	case editorMarkdownCode:
+		return "\x1b[38;2;152;195;121m"
+	case editorMarkdownLink:
+		return "\x1b[4;38;2;97;175;239m"
+	case editorMarkdownDestination:
+		return "\x1b[38;2;86;182;194m"
+	case editorMarkdownQuote:
+		return "\x1b[38;2;229;192;123m"
+	case editorMarkdownComment:
+		return "\x1b[2;38;2;119;119;119m"
+	default:
+		return ""
+	}
+}
+
+func editorMarkdownStyleEnd(active bool) string {
+	foreground := "\x1b[39m"
+	if active {
+		switch currentThemeName {
+		case "dark":
+			foreground = "\x1b[38;2;215;218;232m"
+		case "light":
+			foreground = "\x1b[38;2;36;41;47m"
+		case "high-contrast":
+			foreground = "\x1b[38;2;255;255;255m"
+		}
+	}
+	return "\x1b[22;23;24m" + foreground
+}