Halkyon's shared packages

A pub workspace of the Dart packages Halkyon's apps share: halkyon_ui,
Halkyon's look (the theme, fonts, layout and shared widgets, with texts
in English and German), halkyon_core's low-level primitives and
halkyon_interop's cross-app contracts. Dart 3.13 with LeanCode's lints,
configured once at the root; apps take a package by git, pinned to a
signed commit.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

packages/halkyon_ui/test/l10n/arb_files_test.dart

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+import 'dart:convert';
+import 'dart:io';
+
+import 'package:flutter_test/flutter_test.dart';
+
+/// The messages of the `.arb` file [name] in `lib/l10n/`, without metadata.
+Map<String, String> _messages(String name) => {
+  for (final MapEntry(:key, :value) in (jsonDecode(
+    File('lib/l10n/$name').readAsStringSync(),
+  ) as Map<String, Object?>).entries)
+    if (!key.startsWith('@')) key: value! as String,
+};
+
+/// The names of the placeholders in [message], with plural and select
+/// arguments; the words of their branches don't count. (gen-l10n reads
+/// quotes as text here: `use-escaping` is off.)
+Set<String> _placeholders(String message) {
+  final names = <String>{};
+  // Even depths hold text and placeholders, odd ones a plural's branches.
+  var depth = 0;
+  for (var i = 0; i < message.length; i++) {
+    switch (message[i]) {
+      case '{':
+        final name = RegExp(r'\{\s*(\w+)\s*[,}]').matchAsPrefix(message, i);
+        if (name != null && depth.isEven) {
+          names.add(name.group(1)!);
+        }
+        depth++;
+      case '}':
+        depth--;
+    }
+  }
+  return names;
+}
+
+void main() {
+  final template = _messages('halkyon_ui_en.arb');
+
+  test('German has every message, with the same placeholders', () {
+    final german = _messages('halkyon_ui_de.arb');
+
+    expect(
+      template.keys.where((key) => !german.containsKey(key)),
+      isEmpty,
+      reason: 'untranslated',
+    );
+    expect(
+      german.keys.where((key) => !template.containsKey(key)),
+      isEmpty,
+      reason: 'not in the template',
+    );
+    for (final MapEntry(:key, :value) in german.entries) {
+      expect(_placeholders(value), _placeholders(template[key]!), reason: key);
+    }
+  });
+
+  test("the English variants override the template's messages only, with "
+      'the same placeholders', () {
+    for (final variant in ['halkyon_ui_en_GB.arb', 'halkyon_ui_en_US.arb']) {
+      for (final MapEntry(:key, :value) in _messages(variant).entries) {
+        expect(template, contains(key), reason: '$variant: $key');
+        expect(
+          _placeholders(value),
+          _placeholders(template[key]!),
+          reason: '$variant: $key',
+        );
+      }
+    }
+  });
+}

packages/halkyon_ui/test/l10n/halkyon_ui_localizations_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:halkyon_ui/halkyon_ui.dart';
+import 'package:material_ui/material_ui.dart';
+
+import '../support/test_app.dart';
+
+void main() {
+  test('speaks British English, American English and German', () {
+    expect(
+      lookupHalkyonUiLocalizations(const Locale('en')).colorPickerLabel('X'),
+      'Colour: X',
+    );
+    expect(
+      lookupHalkyonUiLocalizations(
+        const Locale('en', 'GB'),
+      ).colorPickerLabel('X'),
+      'Colour: X',
+    );
+    expect(
+      lookupHalkyonUiLocalizations(
+        const Locale('en', 'US'),
+      ).colorPickerLabel('X'),
+      'Color: X',
+    );
+    expect(
+      lookupHalkyonUiLocalizations(const Locale('de')).colorPickerLabel('X'),
+      'Farbe: X',
+    );
+  });
+
+  testWidgets("an app adding the package's delegate gets its texts in the "
+      "app's language", (tester) async {
+    await tester.pumpWidget(
+      testApp(
+        locale: const Locale('de'),
+        ReorderToggle(
+          reordering: false,
+          labelled: true,
+          tooltip: 'Pfade umsortieren',
+          onToggle: () {},
+        ),
+      ),
+    );
+
+    expect(find.text('Umsortieren'), findsOneWidget);
+  });
+}