refactor: remove frontmatter related functions

lib/file.go

@@ -415,44 +415,3 @@ func isInTextExtensions(name string) bool {
 	i := sort.SearchStrings(textExtensions, search)
 	return i < len(textExtensions) && textExtensions[i] == search
 }
-
-// hasRune checks if the file has the frontmatter rune
-func hasRune(file string) bool {
-	return strings.HasPrefix(file, "---") ||
-		strings.HasPrefix(file, "+++") ||
-		strings.HasPrefix(file, "{")
-}
-
-func editorMode(language string) string {
-	switch language {
-	case "markdown", "asciidoc", "rst":
-		return "content+metadata"
-	}
-
-	return "content"
-}
-
-func editorLanguage(mode string) string {
-	mode = strings.TrimPrefix(mode, ".")
-
-	switch mode {
-	case "md", "markdown", "mdown", "mmark":
-		mode = "markdown"
-	case "yml":
-		mode = "yaml"
-	case "asciidoc", "adoc", "ad":
-		mode = "asciidoc"
-	case "rst":
-		mode = "rst"
-	case "html", "htm", "xml":
-		mode = "htmlmixed"
-	case "js":
-		mode = "javascript"
-	case "go":
-		mode = "golang"
-	case "":
-		mode = "text"
-	}
-
-	return mode
-}