Cthulhu is no longer a fork. Now it is a screen reader written in Golang.

internal/speech/locale_voices.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2026 Storm Dragon
+// Authors: Storm Dragon, Angus Kola
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package speech
+
+import (
+	"os"
+	"sort"
+	"strings"
+)
+
+// LocaleVoices prefers the current locale's exact dialect, then its base
+// language. An unknown locale retains the catalog, matching quick settings.
+func LocaleVoices(voices []Voice) []Voice {
+	locale := ""
+	for _, key := range []string{"LC_ALL", "LC_MESSAGES", "LANG"} {
+		if value := os.Getenv(key); value != "" {
+			locale = value
+			break
+		}
+	}
+	normalize := func(value string) string {
+		value = strings.Split(strings.Split(value, ".")[0], "@")[0]
+		return strings.ToLower(strings.ReplaceAll(value, "_", "-"))
+	}
+	locale = normalize(locale)
+	if locale == "" || locale == "c" || locale == "posix" {
+		locale = "en-us"
+	}
+	for _, language := range []string{locale, strings.SplitN(locale, "-", 2)[0]} {
+		var selected []Voice
+		for _, voice := range voices {
+			if normalize(voice.Language) == language {
+				selected = append(selected, voice)
+			}
+		}
+		if len(selected) == 0 {
+			continue
+		}
+		// A '+' in the synthesis name denotes an eSpeak variant; Variant
+		// is gender metadata and cannot identify the unmodified voice.
+		sort.SliceStable(selected, func(i, j int) bool {
+			return !strings.Contains(selected[i].Name, "+") && strings.Contains(selected[j].Name, "+")
+		})
+		return selected
+	}
+	return voices
+}