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

internal/braille/tables.go

@@ -0,0 +1,56 @@
+package braille
+
+import (
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+)
+
+const tableDirectory = "/usr/share/liblouis/tables"
+
+type TableOption struct {
+	Label string
+	File  string
+}
+
+// AvailableTables lists installed literary and computer tables for the
+// current message locale. English US also offers UEB tables.
+func AvailableTables() []TableOption {
+	locale := ""
+	for _, key := range []string{"LC_ALL", "LC_MESSAGES", "LANG"} {
+		if value := os.Getenv(key); value != "" {
+			locale = value
+			break
+		}
+	}
+	return tablesForLocale(tableDirectory, locale)
+}
+
+func tablesForLocale(dir, locale string) []TableOption {
+	locale = strings.ToLower(strings.ReplaceAll(strings.Split(strings.Split(locale, ".")[0], "@")[0], "_", "-"))
+	if locale == "" || locale == "c" || locale == "posix" {
+		locale = "en-us"
+	}
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		return nil
+	}
+	var result []TableOption
+	for _, entry := range entries {
+		name := entry.Name()
+		lower := strings.ToLower(name)
+		if entry.IsDir() || !(strings.HasSuffix(lower, ".ctb") || strings.HasSuffix(lower, ".utb")) ||
+			strings.Contains(lower, "interline") || strings.Contains(lower, "mathtext") ||
+			!(strings.HasPrefix(lower, locale+"-") || locale == "en-us" && strings.HasPrefix(lower, "en-ueb-")) {
+			continue
+		}
+		label := strings.TrimSuffix(strings.TrimSuffix(name, ".ctb"), ".utb")
+		label = strings.ReplaceAll(label, "-g1", " Grade 1")
+		label = strings.ReplaceAll(label, "-g2", " Grade 2")
+		label = strings.ReplaceAll(label, "-g3", " Grade 3")
+		result = append(result, TableOption{Label: label, File: filepath.Join(dir, name)})
+	}
+	sort.Slice(result, func(i, j int) bool { return result[i].Label < result[j].Label })
+	return result
+}