add script to create release notes

.gitignore

@@ -55,3 +55,6 @@ lib/**/*.gr.dart
 # test stuff
 coverage/lcov.info
 test/full_coverage_test.dart
+
+# Releases
+releasenote.md

bin/mkreleasenote.dart

@@ -0,0 +1,48 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:path/path.dart' as path;
+
+typedef Changelog = MapEntry<String, List<String>>;
+
+List<Changelog> parseChangelog(String string) {
+  final data = <Changelog>[];
+
+  final lines = const LineSplitter()
+      .convert(string)
+      .map((it) => it.trim())
+      .where((it) => it.isNotEmpty);
+
+  for (final line in lines) {
+    if (line.startsWith('## ')) {
+      final ver = line.replaceFirst('## ', '').trim();
+      data.add(Changelog(ver, []));
+    } else if (line.startsWith('* ')) {
+      final log = line.replaceFirst('* ', '').trim();
+      data.last = Changelog(data.last.key, [...data.last.value, log]);
+    } else if (line.isNotEmpty && data.last.value.isNotEmpty) {
+      final newlinelog = '${data.last.value.last}\n$line';
+      final lastlog = data.last.value.sublist(0, data.last.value.length - 1);
+      data.last = Changelog(data.last.key, [...lastlog, newlinelog]);
+    }
+  }
+  return data;
+}
+
+void main() async {
+  final text = StringBuffer();
+
+  final notes = File(path.join(Directory.current.path, 'releasenote.md'));
+  final changelog = File(path.join(Directory.current.path, 'CHANGELOG.md'));
+
+  final data = parseChangelog(changelog.readAsStringSync());
+  final Changelog(key: version, value: logs) = data.first;
+
+  text.writeln("# What's new in $version");
+  text.writeln();
+  for (final log in logs) {
+    text.writeln('- $log');
+  }
+
+  notes.writeAsStringSync(text.toString());
+}

tool/grind.dart

@@ -110,3 +110,9 @@ Future<void> release() async {
   await fun(['build', 'apk', '--split-per-abi']);
   await Pub.runAsync('boorusphere', script: 'renameapks', runOptions: utf8Opt);
 }
+
+@Task('Create release notes')
+Future<void> releaseNote() async {
+  await Pub.runAsync('boorusphere',
+      script: 'mkreleasenote', runOptions: utf8Opt);
+}