1 files changed, 20 insertions, 0 deletions
diff --git a/internal/render/ascii.go b/internal/render/ascii.go
index 4203bc9..077a418 100644
--- a/internal/render/ascii.go
+++ b/internal/render/ascii.go
@@ -25,6 +25,26 @@ var asciiMap = map[rune]string{
 	'│': "|",
 }
 
+// Transliterate maps non-ASCII characters to their ASCII equivalents where one
+// is defined, leaving ASCII alone. For contexts that must not carry diacritics
+// at all -- a generated filename, say -- where "Góra" should become "Gora"
+// rather than losing the letter.
+func Transliterate(s string) string {
+	var b strings.Builder
+	b.Grow(len(s))
+	for _, r := range s {
+		switch {
+		case r < 128:
+			b.WriteRune(r)
+		default:
+			if sub, ok := asciiMap[r]; ok {
+				b.WriteString(sub)
+			}
+		}
+	}
+	return b.String()
+}
+
 // ASCII rewrites output to pure ASCII, one character for one character.
 //
 // The point is SMS: a single non-ASCII character forces the whole message from