After commit c018f5fd29 Fenrir is being switched over to go. If you do not want to be part of the testing process, please switch to master.

internal/spellcheck/words.go

@@ -0,0 +1,71 @@
+// Copyright (c) 2026 Storm Dragon
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package spellcheck
+
+import (
+	"os"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+)
+
+// Language uses the effective session message locale, with no English fallback.
+// LANGUAGE is a translation fallback list, not the session's regional locale.
+func Language() string {
+	for _, name := range []string{"LC_ALL", "LC_MESSAGES", "LANG"} {
+		if value := os.Getenv(name); value != "" {
+			return language_tag(value)
+		}
+	}
+	return ""
+}
+
+func language_tag(value string) string {
+	value, _, _ = strings.Cut(strings.TrimSpace(value), ".")
+	value, _, _ = strings.Cut(value, "@")
+	if value == "C" || value == "POSIX" {
+		return ""
+	}
+	value = strings.ReplaceAll(value, "-", "_")
+	for _, char := range value {
+		if !unicode.IsLetter(char) && char != '_' {
+			return ""
+		}
+	}
+	return value
+}
+
+// Word strips surrounding prose punctuation but leaves structured terminal
+// tokens intact so they can be excluded rather than checked as fragments.
+func Word(value string) string {
+	value = strings.TrimSpace(value)
+	if strings.HasPrefix(value, "-") || strings.HasPrefix(value, "#") || strings.HasPrefix(value, "@") ||
+		strings.ContainsAny(value, "/\\@_=0123456789") || strings.Contains(value, "://") {
+		return ""
+	}
+	value = strings.TrimFunc(value, func(char rune) bool { return !unicode.IsLetter(char) && !unicode.IsMark(char) })
+	if !valid_word(value) {
+		return ""
+	}
+	return value
+}
+
+func valid_word(value string) bool {
+	if !utf8.ValidString(value) || utf8.RuneCountInString(value) > 128 || value == "" {
+		return false
+	}
+	letters := false
+	for _, char := range value {
+		if unicode.IsLetter(char) {
+			letters = true
+		} else if !unicode.IsMark(char) && char != '\'' && char != '’' && char != '-' && char != '‐' {
+			return false
+		}
+	}
+	return letters
+}
+
+func Separator(char rune) bool {
+	return unicode.IsSpace(char) || unicode.IsPunct(char) && !strings.ContainsRune("'.:/@\\_=-’‐#", char)
+}