colorize-output using regexes, refactor line colorization (#49)

lib/helpers.go

@@ -1,5 +1,5 @@
 /*
-Copyright © 2022 Thomas von Dein
+Copyright © 2022-2026 Thomas von Dein
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -26,8 +26,8 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/gookit/color"
 	"codeberg.org/scip/tablizer/cfg"
+	"github.com/gookit/color"
 )
 
 func findindex(s []int, e int) (int, bool) {
@@ -245,35 +245,33 @@ func reduceColumns(conf cfg.Config, data *Tabdata) {
 	}
 }
 
-// FIXME: refactor this beast!
 func colorizeData(conf cfg.Config, output string) string {
+	if !conf.NoColor && !color.IsConsole(os.Stdout) {
+		return output
+	}
+
 	switch {
-	case conf.UseHighlight && color.IsConsole(os.Stdout):
+	case conf.UseHighlight:
 		highlight := true
 		colorized := ""
-		first := true
+		style := color.Style{}
 
-		for _, line := range strings.Split(output, "\n") {
-			if highlight {
-				if first {
-					// we  need to add  two spaces to the  header line
-					//  because tablewriter omits them for some reason
-					//  in pprint mode. This doesn't matter as long as
-					//  we don't use colorization. But with colors the
-					// missing spaces can be seen.
-					if conf.OutputMode == cfg.ASCII {
-						line += "  "
-					}
-
-					line = conf.HighlightHdrStyle.Sprint(line)
-					first = false
-				} else {
-					line = conf.HighlightStyle.Sprint(line)
-				}
-			} else {
-				line = conf.NoHighlightStyle.Sprint(line)
+		for idx, line := range strings.Split(output, "\n") {
+			if idx == 0 {
+				style = conf.HighlightHdrStyle
 			}
 
+			switch highlight {
+			case true:
+				if idx > 0 {
+					style = conf.HighlightStyle
+				}
+			case false:
+				style = conf.NoHighlightStyle
+			}
+
+			line = style.Sprint(line)
+
 			highlight = !highlight
 
 			colorized += line + "\n"
@@ -281,7 +279,7 @@ func colorizeData(conf cfg.Config, output string) string {
 
 		return colorized
 
-	case len(conf.Patterns) > 0 && !conf.NoColor && color.IsConsole(os.Stdout):
+	case len(conf.Patterns) > 0:
 		out := output
 
 		for _, re := range conf.Patterns {