build(editor): halkyon_editor joins the workspace (ADR 0033, D37)

The package for the general parts of Learn's editor, its strings first;
the code moves next.

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

.dockerignore

@@ -37,6 +37,7 @@ apps/train/halkyon_train_flutter/
 apps/train/halkyon_train_client/
 apps/train/halkyon_train_server/.serverpod/
 packages/halkyon_app/
+packages/halkyon_editor/
 packages/halkyon_interop/
 packages/halkyon_keys/
 packages/halkyon_ui/

packages/halkyon_editor/LICENSE

@@ -0,0 +1,661 @@
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

packages/halkyon_editor/analysis_options.yaml

@@ -0,0 +1,11 @@
+# The workspace's lint rules (see ../../analysis_options.yaml).
+include: ../../analysis_options.yaml
+
+analyzer:
+  exclude:
+    - build/**
+    # Generated by gen-l10n (see l10n.yaml).
+    - lib/l10n/halkyon_editor_localizations*.dart
+
+formatter:
+  trailing_commas: preserve

packages/halkyon_editor/build/f05bfb3d5907fd0115f5797e28554b94/.filecache

@@ -0,0 +1 @@
+{"version":2,"files":[{"path":"/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_de.arb","hash":"6b8a8b0527dd52d280c1faa1a07882f1"},{"path":"/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/l10n.yaml","hash":"0342d6e136de130d2e707036a597a295"},{"path":"/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en_US.arb","hash":"3b8698153fa405ef962fde0e8e8cc40a"},{"path":"/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en.arb","hash":"80c19296a03bb2361c02030d3f371a9a"},{"path":"/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations.dart","hash":"ea32e9f4dec50a505359de4dc05a3248"},{"path":"/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_de.dart","hash":"d0a9725747d946a015c47bfb34cb6c2b"},{"path":"/home/raisondetredev/snap/flutter/common/flutter/packages/flutter_tools/lib/src/build_system/targets/localizations.dart","hash":"65f1e06e150468c7e7f576d8a46ce835"},{"path":"/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en_GB.arb","hash":"78693c50512af6a3bf684a4987e55377"},{"path":"/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_en.dart","hash":"9995fccbee2f45978b08979fa101a676"}]}

packages/halkyon_editor/build/f05bfb3d5907fd0115f5797e28554b94/gen_l10n_inputs_and_outputs.json

@@ -0,0 +1 @@
+{"inputs":["/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_de.arb","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en.arb","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en_GB.arb","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en_US.arb"],"outputs":["/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_de.dart","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_en.dart","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations.dart"]}

packages/halkyon_editor/build/f05bfb3d5907fd0115f5797e28554b94/gen_localizations.d

@@ -0,0 +1 @@
+ /home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_de.dart /home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_en.dart /home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations.dart:  /home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/l10n.yaml /home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_de.arb /home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en.arb /home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en_GB.arb /home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en_US.arb

packages/halkyon_editor/build/f05bfb3d5907fd0115f5797e28554b94/gen_localizations.stamp

@@ -0,0 +1 @@
+{"inputs":["/home/raisondetredev/snap/flutter/common/flutter/packages/flutter_tools/lib/src/build_system/targets/localizations.dart","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/l10n.yaml","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_de.arb","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en.arb","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en_GB.arb","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_en_US.arb"],"outputs":["/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_de.dart","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_en.dart","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations.dart"]}

packages/halkyon_editor/build/f05bfb3d5907fd0115f5797e28554b94/outputs.json

@@ -0,0 +1 @@
+["/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_de.dart","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_en.dart","/home/raisondetredev/project-halkyon/halkyon/.claude/worktrees/agent-ae343a19185e1b19c/packages/halkyon_editor/lib/l10n/halkyon_editor_localizations.dart"]

packages/halkyon_editor/l10n.yaml

@@ -0,0 +1,14 @@
+# Flutter's gen-l10n: the strings in lib/l10n/*.arb become
+# HalkyonEditorLocalizations, generated into lib/l10n/halkyon_editor_localizations*.dart
+# (committed, never edited or formatted by hand, as halkyon_ui's).
+# halkyon_editor_en.arb, the template, is British English, also the fallback;
+# halkyon_editor_en_US.arb overrides what American English spells differently;
+# halkyon_editor_en_GB.arb is empty; German says "du".
+arb-dir: lib/l10n
+template-arb-file: halkyon_editor_en.arb
+output-dir: lib/l10n
+output-localization-file: halkyon_editor_localizations.dart
+output-class: HalkyonEditorLocalizations
+# `HalkyonEditorLocalizations.of(context).foo` without a `!`: apps install the
+# delegate.
+nullable-getter: false

packages/halkyon_editor/lib/halkyon_editor.dart

@@ -0,0 +1,3 @@
+/// Halkyon's rich text: the editor, the read-only view and the document
+/// they keep.
+library;

packages/halkyon_editor/lib/l10n/halkyon_editor_de.arb

@@ -0,0 +1,35 @@
+{
+  "@@locale": "de",
+  "formatAlignLeft": "Linksbündig",
+  "formatAlignCenter": "Zentriert",
+  "formatAlignRight": "Rechtsbündig",
+  "formatBold": "Fett",
+  "formatItalic": "Kursiv",
+  "formatUnderline": "Unterstrichen",
+  "formatSuperscript": "Hochgestellt",
+  "formatSubscript": "Tiefgestellt",
+  "formatLink": "Link",
+  "linkTitle": "Link",
+  "linkText": "Text",
+  "linkAddress": "Adresse",
+  "linkAddressHint": "https://…",
+  "linkSave": "Speichern",
+  "linkRemove": "Link entfernen",
+  "commonCancel": "Abbrechen",
+  "editorInsert": "Einfügen",
+  "blockGroupText": "Text",
+  "blockGroupBlocks": "Blöcke",
+  "blockGroupMedia": "Medien",
+  "blockHeading": "Überschrift {level}",
+  "blockBulletedList": "Aufzählung",
+  "blockNumberedList": "Nummerierte Liste",
+  "blockChecklist": "Checkliste",
+  "blockQuote": "Zitat",
+  "blockListItem": "Listenpunkt",
+  "blockChecklistItem": "Aufgabe",
+  "editorSlashHint": "Tippe / für einen Block oder schreib einfach los",
+  "blockDivider": "Trennlinie",
+  "blockTable": "Tabelle",
+  "blockRemove": "Entfernen",
+  "blockUnknown": "Dieser Teil braucht eine neuere Version der App."
+}

packages/halkyon_editor/lib/l10n/halkyon_editor_en.arb

@@ -0,0 +1,42 @@
+{
+  "@@locale": "en",
+  "formatAlignLeft": "Align left",
+  "formatAlignCenter": "Centre",
+  "formatAlignRight": "Align right",
+  "formatBold": "Bold",
+  "formatItalic": "Italic",
+  "formatUnderline": "Underline",
+  "formatSuperscript": "Superscript",
+  "formatSubscript": "Subscript",
+  "formatLink": "Link",
+  "linkTitle": "Link",
+  "linkText": "Text",
+  "linkAddress": "Address",
+  "linkAddressHint": "https://…",
+  "linkSave": "Save",
+  "linkRemove": "Remove link",
+  "commonCancel": "Cancel",
+  "editorInsert": "Insert",
+  "blockGroupText": "Text",
+  "blockGroupBlocks": "Blocks",
+  "blockGroupMedia": "Media",
+  "blockHeading": "Heading {level}",
+  "@blockHeading": {
+    "placeholders": {
+      "level": {
+        "type": "int"
+      }
+    }
+  },
+  "blockBulletedList": "Bulleted list",
+  "blockNumberedList": "Numbered list",
+  "blockChecklist": "Checklist",
+  "blockQuote": "Quote",
+  "blockListItem": "List item",
+  "blockChecklistItem": "To-do",
+  "editorSlashHint": "Type / to insert a block, or just start typing",
+  "blockDivider": "Divider",
+  "blockTable": "Table",
+  "blockRemove": "Remove",
+  "blockUnknown": "This part needs a newer version of the app."
+}

packages/halkyon_editor/lib/l10n/halkyon_editor_en_GB.arb

@@ -0,0 +1,3 @@
+{
+  "@@locale": "en_GB"
+}

packages/halkyon_editor/lib/l10n/halkyon_editor_en_US.arb

@@ -0,0 +1,4 @@
+{
+  "@@locale": "en_US",
+  "formatAlignCenter": "Center"
+}

packages/halkyon_editor/lib/l10n/halkyon_editor_localizations.dart

@@ -0,0 +1,347 @@
+import 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:intl/intl.dart' as intl;
+
+import 'halkyon_editor_localizations_de.dart';
+import 'halkyon_editor_localizations_en.dart';
+
+// ignore_for_file: type=lint
+
+/// Callers can lookup localized strings with an instance of HalkyonEditorLocalizations
+/// returned by `HalkyonEditorLocalizations.of(context)`.
+///
+/// Applications need to include `HalkyonEditorLocalizations.delegate()` in their app's
+/// `localizationDelegates` list, and the locales they support in the app's
+/// `supportedLocales` list. For example:
+///
+/// ```dart
+/// import 'l10n/halkyon_editor_localizations.dart';
+///
+/// return MaterialApp(
+///   localizationsDelegates: HalkyonEditorLocalizations.localizationsDelegates,
+///   supportedLocales: HalkyonEditorLocalizations.supportedLocales,
+///   home: MyApplicationHome(),
+/// );
+/// ```
+///
+/// ## Update pubspec.yaml
+///
+/// Please make sure to update your pubspec.yaml to include the following
+/// packages:
+///
+/// ```yaml
+/// dependencies:
+///   # Internationalization support.
+///   flutter_localizations:
+///     sdk: flutter
+///   intl: any # Use the pinned version from flutter_localizations
+///
+///   # Rest of dependencies
+/// ```
+///
+/// ## iOS Applications
+///
+/// iOS applications define key application metadata, including supported
+/// locales, in an Info.plist file that is built into the application bundle.
+/// To configure the locales supported by your app, you’ll need to edit this
+/// file.
+///
+/// First, open your project’s ios/Runner.xcworkspace Xcode workspace file.
+/// Then, in the Project Navigator, open the Info.plist file under the Runner
+/// project’s Runner folder.
+///
+/// Next, select the Information Property List item, select Add Item from the
+/// Editor menu, then select Localizations from the pop-up menu.
+///
+/// Select and expand the newly-created Localizations item then, for each
+/// locale your application supports, add a new item and select the locale
+/// you wish to add from the pop-up menu in the Value field. This list should
+/// be consistent with the languages listed in the HalkyonEditorLocalizations.supportedLocales
+/// property.
+abstract class HalkyonEditorLocalizations {
+  HalkyonEditorLocalizations(String locale)
+    : localeName = intl.Intl.canonicalizedLocale(locale.toString());
+
+  final String localeName;
+
+  static HalkyonEditorLocalizations of(BuildContext context) {
+    return Localizations.of<HalkyonEditorLocalizations>(
+      context,
+      HalkyonEditorLocalizations,
+    )!;
+  }
+
+  static const LocalizationsDelegate<HalkyonEditorLocalizations> delegate =
+      _HalkyonEditorLocalizationsDelegate();
+
+  /// A list of this localizations delegate along with the default localizations
+  /// delegates.
+  ///
+  /// Returns a list of localizations delegates containing this delegate along with
+  /// GlobalMaterialLocalizations.delegate, GlobalCupertinoLocalizations.delegate,
+  /// and GlobalWidgetsLocalizations.delegate.
+  ///
+  /// Additional delegates can be added by appending to this list in
+  /// MaterialApp. This list does not have to be used at all if a custom list
+  /// of delegates is preferred or required.
+  static const List<LocalizationsDelegate<dynamic>> localizationsDelegates =
+      <LocalizationsDelegate<dynamic>>[
+        delegate,
+        GlobalMaterialLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+      ];
+
+  /// A list of this localizations delegate's supported locales.
+  static const List<Locale> supportedLocales = <Locale>[
+    Locale('de'),
+    Locale('en'),
+    Locale('en', 'GB'),
+    Locale('en', 'US'),
+  ];
+
+  /// No description provided for @formatAlignLeft.
+  ///
+  /// In en, this message translates to:
+  /// **'Align left'**
+  String get formatAlignLeft;
+
+  /// No description provided for @formatAlignCenter.
+  ///
+  /// In en, this message translates to:
+  /// **'Centre'**
+  String get formatAlignCenter;
+
+  /// No description provided for @formatAlignRight.
+  ///
+  /// In en, this message translates to:
+  /// **'Align right'**
+  String get formatAlignRight;
+
+  /// No description provided for @formatBold.
+  ///
+  /// In en, this message translates to:
+  /// **'Bold'**
+  String get formatBold;
+
+  /// No description provided for @formatItalic.
+  ///
+  /// In en, this message translates to:
+  /// **'Italic'**
+  String get formatItalic;
+
+  /// No description provided for @formatUnderline.
+  ///
+  /// In en, this message translates to:
+  /// **'Underline'**
+  String get formatUnderline;
+
+  /// No description provided for @formatSuperscript.
+  ///
+  /// In en, this message translates to:
+  /// **'Superscript'**
+  String get formatSuperscript;
+
+  /// No description provided for @formatSubscript.
+  ///
+  /// In en, this message translates to:
+  /// **'Subscript'**
+  String get formatSubscript;
+
+  /// No description provided for @formatLink.
+  ///
+  /// In en, this message translates to:
+  /// **'Link'**
+  String get formatLink;
+
+  /// No description provided for @linkTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Link'**
+  String get linkTitle;
+
+  /// No description provided for @linkText.
+  ///
+  /// In en, this message translates to:
+  /// **'Text'**
+  String get linkText;
+
+  /// No description provided for @linkAddress.
+  ///
+  /// In en, this message translates to:
+  /// **'Address'**
+  String get linkAddress;
+
+  /// No description provided for @linkAddressHint.
+  ///
+  /// In en, this message translates to:
+  /// **'https://…'**
+  String get linkAddressHint;
+
+  /// No description provided for @linkSave.
+  ///
+  /// In en, this message translates to:
+  /// **'Save'**
+  String get linkSave;
+
+  /// No description provided for @linkRemove.
+  ///
+  /// In en, this message translates to:
+  /// **'Remove link'**
+  String get linkRemove;
+
+  /// No description provided for @commonCancel.
+  ///
+  /// In en, this message translates to:
+  /// **'Cancel'**
+  String get commonCancel;
+
+  /// No description provided for @editorInsert.
+  ///
+  /// In en, this message translates to:
+  /// **'Insert'**
+  String get editorInsert;
+
+  /// No description provided for @blockGroupText.
+  ///
+  /// In en, this message translates to:
+  /// **'Text'**
+  String get blockGroupText;
+
+  /// No description provided for @blockGroupBlocks.
+  ///
+  /// In en, this message translates to:
+  /// **'Blocks'**
+  String get blockGroupBlocks;
+
+  /// No description provided for @blockGroupMedia.
+  ///
+  /// In en, this message translates to:
+  /// **'Media'**
+  String get blockGroupMedia;
+
+  /// No description provided for @blockHeading.
+  ///
+  /// In en, this message translates to:
+  /// **'Heading {level}'**
+  String blockHeading(int level);
+
+  /// No description provided for @blockBulletedList.
+  ///
+  /// In en, this message translates to:
+  /// **'Bulleted list'**
+  String get blockBulletedList;
+
+  /// No description provided for @blockNumberedList.
+  ///
+  /// In en, this message translates to:
+  /// **'Numbered list'**
+  String get blockNumberedList;
+
+  /// No description provided for @blockChecklist.
+  ///
+  /// In en, this message translates to:
+  /// **'Checklist'**
+  String get blockChecklist;
+
+  /// No description provided for @blockQuote.
+  ///
+  /// In en, this message translates to:
+  /// **'Quote'**
+  String get blockQuote;
+
+  /// No description provided for @blockListItem.
+  ///
+  /// In en, this message translates to:
+  /// **'List item'**
+  String get blockListItem;
+
+  /// No description provided for @blockChecklistItem.
+  ///
+  /// In en, this message translates to:
+  /// **'To-do'**
+  String get blockChecklistItem;
+
+  /// No description provided for @editorSlashHint.
+  ///
+  /// In en, this message translates to:
+  /// **'Type / to insert a block, or just start typing'**
+  String get editorSlashHint;
+
+  /// No description provided for @blockDivider.
+  ///
+  /// In en, this message translates to:
+  /// **'Divider'**
+  String get blockDivider;
+
+  /// No description provided for @blockTable.
+  ///
+  /// In en, this message translates to:
+  /// **'Table'**
+  String get blockTable;
+
+  /// No description provided for @blockRemove.
+  ///
+  /// In en, this message translates to:
+  /// **'Remove'**
+  String get blockRemove;
+
+  /// No description provided for @blockUnknown.
+  ///
+  /// In en, this message translates to:
+  /// **'This part needs a newer version of the app.'**
+  String get blockUnknown;
+}
+
+class _HalkyonEditorLocalizationsDelegate
+    extends LocalizationsDelegate<HalkyonEditorLocalizations> {
+  const _HalkyonEditorLocalizationsDelegate();
+
+  @override
+  Future<HalkyonEditorLocalizations> load(Locale locale) {
+    return SynchronousFuture<HalkyonEditorLocalizations>(
+      lookupHalkyonEditorLocalizations(locale),
+    );
+  }
+
+  @override
+  bool isSupported(Locale locale) =>
+      <String>['de', 'en'].contains(locale.languageCode);
+
+  @override
+  bool shouldReload(_HalkyonEditorLocalizationsDelegate old) => false;
+}
+
+HalkyonEditorLocalizations lookupHalkyonEditorLocalizations(Locale locale) {
+  // Lookup logic when language+country codes are specified.
+  switch (locale.languageCode) {
+    case 'en':
+      {
+        switch (locale.countryCode) {
+          case 'GB':
+            return HalkyonEditorLocalizationsEnGb();
+          case 'US':
+            return HalkyonEditorLocalizationsEnUs();
+        }
+        break;
+      }
+  }
+
+  // Lookup logic when only language code is specified.
+  switch (locale.languageCode) {
+    case 'de':
+      return HalkyonEditorLocalizationsDe();
+    case 'en':
+      return HalkyonEditorLocalizationsEn();
+  }
+
+  throw FlutterError(
+    'HalkyonEditorLocalizations.delegate failed to load unsupported locale "$locale". This is likely '
+    'an issue with the localizations generation tool. Please file an issue '
+    'on GitHub with a reproducible sample app and the gen-l10n configuration '
+    'that was used.',
+  );
+}

packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_de.dart

@@ -0,0 +1,110 @@
+// ignore: unused_import
+import 'package:intl/intl.dart' as intl;
+
+import 'halkyon_editor_localizations.dart';
+
+// ignore_for_file: type=lint
+
+/// The translations for German (`de`).
+class HalkyonEditorLocalizationsDe extends HalkyonEditorLocalizations {
+  HalkyonEditorLocalizationsDe([String locale = 'de']) : super(locale);
+
+  @override
+  String get formatAlignLeft => 'Linksbündig';
+
+  @override
+  String get formatAlignCenter => 'Zentriert';
+
+  @override
+  String get formatAlignRight => 'Rechtsbündig';
+
+  @override
+  String get formatBold => 'Fett';
+
+  @override
+  String get formatItalic => 'Kursiv';
+
+  @override
+  String get formatUnderline => 'Unterstrichen';
+
+  @override
+  String get formatSuperscript => 'Hochgestellt';
+
+  @override
+  String get formatSubscript => 'Tiefgestellt';
+
+  @override
+  String get formatLink => 'Link';
+
+  @override
+  String get linkTitle => 'Link';
+
+  @override
+  String get linkText => 'Text';
+
+  @override
+  String get linkAddress => 'Adresse';
+
+  @override
+  String get linkAddressHint => 'https://…';
+
+  @override
+  String get linkSave => 'Speichern';
+
+  @override
+  String get linkRemove => 'Link entfernen';
+
+  @override
+  String get commonCancel => 'Abbrechen';
+
+  @override
+  String get editorInsert => 'Einfügen';
+
+  @override
+  String get blockGroupText => 'Text';
+
+  @override
+  String get blockGroupBlocks => 'Blöcke';
+
+  @override
+  String get blockGroupMedia => 'Medien';
+
+  @override
+  String blockHeading(int level) {
+    return 'Überschrift $level';
+  }
+
+  @override
+  String get blockBulletedList => 'Aufzählung';
+
+  @override
+  String get blockNumberedList => 'Nummerierte Liste';
+
+  @override
+  String get blockChecklist => 'Checkliste';
+
+  @override
+  String get blockQuote => 'Zitat';
+
+  @override
+  String get blockListItem => 'Listenpunkt';
+
+  @override
+  String get blockChecklistItem => 'Aufgabe';
+
+  @override
+  String get editorSlashHint =>
+      'Tippe / für einen Block oder schreib einfach los';
+
+  @override
+  String get blockDivider => 'Trennlinie';
+
+  @override
+  String get blockTable => 'Tabelle';
+
+  @override
+  String get blockRemove => 'Entfernen';
+
+  @override
+  String get blockUnknown => 'Dieser Teil braucht eine neuere Version der App.';
+}

packages/halkyon_editor/lib/l10n/halkyon_editor_localizations_en.dart

@@ -0,0 +1,123 @@
+// ignore: unused_import
+import 'package:intl/intl.dart' as intl;
+
+import 'halkyon_editor_localizations.dart';
+
+// ignore_for_file: type=lint
+
+/// The translations for English (`en`).
+class HalkyonEditorLocalizationsEn extends HalkyonEditorLocalizations {
+  HalkyonEditorLocalizationsEn([String locale = 'en']) : super(locale);
+
+  @override
+  String get formatAlignLeft => 'Align left';
+
+  @override
+  String get formatAlignCenter => 'Centre';
+
+  @override
+  String get formatAlignRight => 'Align right';
+
+  @override
+  String get formatBold => 'Bold';
+
+  @override
+  String get formatItalic => 'Italic';
+
+  @override
+  String get formatUnderline => 'Underline';
+
+  @override
+  String get formatSuperscript => 'Superscript';
+
+  @override
+  String get formatSubscript => 'Subscript';
+
+  @override
+  String get formatLink => 'Link';
+
+  @override
+  String get linkTitle => 'Link';
+
+  @override
+  String get linkText => 'Text';
+
+  @override
+  String get linkAddress => 'Address';
+
+  @override
+  String get linkAddressHint => 'https://…';
+
+  @override
+  String get linkSave => 'Save';
+
+  @override
+  String get linkRemove => 'Remove link';
+
+  @override
+  String get commonCancel => 'Cancel';
+
+  @override
+  String get editorInsert => 'Insert';
+
+  @override
+  String get blockGroupText => 'Text';
+
+  @override
+  String get blockGroupBlocks => 'Blocks';
+
+  @override
+  String get blockGroupMedia => 'Media';
+
+  @override
+  String blockHeading(int level) {
+    return 'Heading $level';
+  }
+
+  @override
+  String get blockBulletedList => 'Bulleted list';
+
+  @override
+  String get blockNumberedList => 'Numbered list';
+
+  @override
+  String get blockChecklist => 'Checklist';
+
+  @override
+  String get blockQuote => 'Quote';
+
+  @override
+  String get blockListItem => 'List item';
+
+  @override
+  String get blockChecklistItem => 'To-do';
+
+  @override
+  String get editorSlashHint =>
+      'Type / to insert a block, or just start typing';
+
+  @override
+  String get blockDivider => 'Divider';
+
+  @override
+  String get blockTable => 'Table';
+
+  @override
+  String get blockRemove => 'Remove';
+
+  @override
+  String get blockUnknown => 'This part needs a newer version of the app.';
+}
+
+/// The translations for English, as used in the United Kingdom (`en_GB`).
+class HalkyonEditorLocalizationsEnGb extends HalkyonEditorLocalizationsEn {
+  HalkyonEditorLocalizationsEnGb() : super('en_GB');
+}
+
+/// The translations for English, as used in the United States (`en_US`).
+class HalkyonEditorLocalizationsEnUs extends HalkyonEditorLocalizationsEn {
+  HalkyonEditorLocalizationsEnUs() : super('en_US');
+
+  @override
+  String get formatAlignCenter => 'Center';
+}

packages/halkyon_editor/pubspec.yaml

@@ -0,0 +1,36 @@
+name: halkyon_editor
+description: "Halkyon's rich text: the editor, the read-only view and the document they keep, shared by its apps."
+version: 0.1.0
+publish_to: none
+resolution: workspace
+
+environment:
+  sdk: ^3.13.0
+  flutter: ^3.44.4
+
+dependencies:
+  # Our fork of the editor's main branch, moved to win32 v6 so the apps can stay in the
+  # pub workspace, pinned to a signed commit of its branch halkyon/win32-v6. The same
+  # URL and ref as Learn's, which pub requires of one resolution.
+  appflowy_editor:
+    git:
+      url: https://code.halkyon.app/project-halkyon/appflowy-editor.git
+      ref: 81c3006c74e789ed2e470b8612529541b358fd26
+  equatable: ^3.0.0
+  flutter:
+    sdk: flutter
+  flutter_bloc: ^9.1.1
+  flutter_localizations:
+    sdk: flutter
+  halkyon_ui:
+    path: ../halkyon_ui
+  intl: ^0.20.3
+  lucide_icons_flutter: ^3.1.20
+  material_ui: ^1.5.0
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+flutter:
+  generate: true

packages/halkyon_editor/test/l10n/arb_files_test.dart

@@ -0,0 +1,78 @@
+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/$name').readAsStringSync(),
+  ) as Map<String, Object?>).entries)
+    if (!key.startsWith('@')) key: value! as String,
+};
+
+/// The names of the placeholders in [message], with plural and select
+/// arguments; the words of their branches don't count. (gen-l10n reads
+/// quotes as text here: `use-escaping` is off.)
+Set<String> _placeholders(String message) {
+  final names = <String>{};
+  // Even depths hold text and placeholders, odd ones a plural's branches.
+  var depth = 0;
+  for (var i = 0; i < message.length; i++) {
+    switch (message[i]) {
+      case '{':
+        final name = RegExp(r'\{\s*(\w+)\s*[,}]').matchAsPrefix(message, i);
+        if (name != null && depth.isEven) {
+          names.add(name.group(1)!);
+        }
+        depth++;
+      case '}':
+        depth--;
+    }
+  }
+  return names;
+}
+
+void main() {
+  final template = _messages('halkyon_editor_en.arb');
+
+  test('German has every message, with the same placeholders', () {
+    final german = _messages('halkyon_editor_de.arb');
+
+    expect(
+      template.keys.where((key) => !german.containsKey(key)),
+      isEmpty,
+      reason: 'untranslated',
+    );
+    expect(
+      german.keys.where((key) => !template.containsKey(key)),
+      isEmpty,
+      reason: 'not in the template',
+    );
+    for (final MapEntry(:key, :value) in german.entries) {
+      expect(_placeholders(value), _placeholders(template[key]!), reason: key);
+    }
+  });
+
+  test("the English variants override the template's messages only, with "
+      'the same placeholders', () {
+    for (final variant in ['halkyon_editor_en_GB.arb', 'halkyon_editor_en_US.arb']) {
+      for (final MapEntry(:key, :value) in _messages(variant).entries) {
+        expect(template, contains(key), reason: '$variant: $key');
+        expect(
+          _placeholders(value),
+          _placeholders(template[key]!),
+          reason: '$variant: $key',
+        );
+      }
+    }
+  });
+
+  test('a placeholder is found also inside a plural', () {
+    expect(
+      _placeholders('{count, plural, =1{1 card} other{{count} cards in {t}}}'),
+      {'count', 't'},
+    );
+    expect(_placeholders("Couldn't open {name}"), {'name'});
+  });
+}

pubspec.yaml

@@ -28,6 +28,7 @@ workspace:
   - packages/halkyon_base_client
   - packages/halkyon_base_server
   - packages/halkyon_core
+  - packages/halkyon_editor
   - packages/halkyon_interop
   - packages/halkyon_keys
   - packages/halkyon_llm