feat: add function that escape \t to blank

pkg/util/code.go

@@ -0,0 +1,44 @@
+package util
+
+import (
+	"regexp"
+	"strings"
+)
+
+var reTab = regexp.MustCompile(`^\t+`)
+
+func IndentTabToSpaces(code string, spaces int) string {
+	indentation := strings.Repeat(" ", spaces)
+	return reTab.ReplaceAllString(code, indentation)
+}
+
+func IndentTab4Spaces(code string) string {
+	return IndentTabToSpaces(code, 4)
+}
+
+func IndentTab2Spaces(code string) string {
+	return IndentTabToSpaces(code, 2)
+}
+
+var re2Spaces = regexp.MustCompile(`^` + strings.Repeat(" ", 2))
+var re4Spaces = regexp.MustCompile(`^` + strings.Repeat(" ", 4))
+
+func IndentSpacesToTab(code string, spaces int) string {
+	switch spaces {
+	case 2:
+		return re2Spaces.ReplaceAllString(code, "\t")
+	case 4:
+		return re4Spaces.ReplaceAllString(code, "\t")
+	default:
+		re := regexp.MustCompile(`^` + strings.Repeat(" ", spaces))
+		return re.ReplaceAllString(code, "\t")
+	}
+}
+
+func Indent4SpacesToTab(code string) string {
+	return IndentSpacesToTab(code, 4)
+}
+
+func Indent2SpacesToTab(code string) string {
+	return IndentSpacesToTab(code, 2)
+}