split a bunch of lists free of UI templates, and also fixed profile language display

util/timelist.go

@@ -0,0 +1,57 @@
+/*
+ * Amsterdam Web Communities System
+ * Copyright (c) 2025 Erbosoft Metaverse Design Solutions, All Rights Reserved
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+// Package util contains utility definitions.
+package util
+
+import (
+	"slices"
+	"sync"
+	"time"
+
+	"github.com/tkuchiki/go-timezone"
+)
+
+// cachedTimeZoneList is a wrapper around timezone.Timezones() that produces it by timezone name.
+var cachedTimeZoneList []string = nil
+
+// timeZoneListMutex controls access to internalGetTimeZoneList.
+var timeZoneListMutex sync.Mutex
+
+// AmTimeZoneList is a wrapper around TimeZone.TimeZones() that sorts and compacts the list.
+func AmTimeZoneList() []string {
+	timeZoneListMutex.Lock()
+	defer timeZoneListMutex.Unlock()
+	if cachedTimeZoneList == nil {
+		timezones := timezone.New().Timezones()
+		ilist := make([]string, 0, len(timezones)*5)
+		for k, v := range timezones {
+			ilist = append(ilist, k)
+			ilist = append(ilist, v...)
+		}
+
+		slices.Sort(ilist)
+		cachedTimeZoneList = slices.Compact(ilist)
+	}
+	return cachedTimeZoneList
+}
+
+// AmMonthList is a simple wrapper that returns the names of the months to the template context.
+func AmMonthList() []string {
+	rc := make([]string, 12)
+	for m := time.January; m <= time.December; m++ {
+		rc[m-time.January] = m.String()
+	}
+	return rc
+}
+
+// init preloads the time zone list.
+func init() {
+	go AmTimeZoneList()
+}