Add automatic publish and test scripts.

Author: jwr1

.github/workflows/publish.yml

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+name: Publish
+
+on:
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '2.x'
+          channel: 'stable'
+
+      - run: dart pub get
+
+      - run: dart run .scripts/publish.dart '${{ secrets.PUB_CREDENTIALS }}' ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test.yaml

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+name: Test
+
+on:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '2.x'
+          channel: 'stable'
+
+      - run: dart pub get
+
+      - run: dart run .scripts/test.dart

.scripts/publish.dart

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+import 'dart:convert';
+import 'dart:io';
+
+import 'package:http/http.dart' as http;
+import 'package:path/path.dart' as path;
+import 'package:yaml/yaml.dart';
+
+import 'utils.dart';
+import 'test.dart' as test;
+
+final changelogExp = RegExp(r'## +(.*?)\s*\n([\s\S]+?)\n\s*##');
+
+Future<void> _dartPublish() async {
+  await runProcess('dart', ['pub', 'publish', '-f']);
+}
+
+Future<void> _githubRelease(String token, String version, String body) async {
+  final response = await http.post(
+    Uri.parse(
+        'https://api.github.com/repos/fontsource/fontsource-flutter/releases'),
+    headers: {
+      'accept': 'toapplication/vnd.github.v3+json',
+      'Authorization': 'token ${token}'
+    },
+    body: jsonEncode({'tag_name': 'v$version', 'body': body}),
+  );
+  print('GitHub Release: ${response.reasonPhrase}');
+  final responseError = jsonDecode(response.body)['errors'];
+  if (responseError != null) throw Exception(responseError);
+}
+
+void main(List<String> args) async {
+  await test.main();
+
+  final pubCredentials = args[0];
+  final githubToken = args[1];
+
+  String version;
+  String body;
+  try {
+    try {
+      final matches =
+          changelogExp.firstMatch(File('CHANGELOG.md').readAsStringSync());
+      if (matches == null) throw Exception();
+      final match1 = matches.group(1);
+      if (match1 == null) throw Exception();
+      final match2 = matches.group(2);
+      if (match2 == null) throw Exception();
+      version = match1;
+      body = match2;
+    } catch (e) {
+      throw Exception('Invalid changelog.');
+    }
+
+    if (version !=
+        loadYaml(File('pubspec.yaml').readAsStringSync())['version']) {
+      throw Exception('Pubspec version differs from changelog.');
+    }
+
+    File(path.join(
+        Platform.environment['HOME']!, '.config/dart/pub-credentials.json'))
+      ..createSync(recursive: true)
+      ..writeAsStringSync(pubCredentials);
+
+    await _dartPublish();
+
+    print('');
+
+    await _githubRelease(githubToken, version, body);
+  } catch (e) {
+    stderr.writeln(e);
+    exit(1);
+  }
+}

.scripts/test.dart

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+import 'utils.dart';
+
+Future<void> main() async {
+  await runProcess('dart', ['pub', 'get'], 'example');
+  await runProcess('dart', ['run', 'fontsource'], 'example');
+}

.scripts/utils.dart

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+import 'dart:io';
+
+Future<void> runProcess(String executable, List<String> arguments,
+    [String? workingDirectory]) async {
+  final process = await Process.start(
+    executable,
+    arguments,
+    workingDirectory: workingDirectory,
+  );
+  stdout.addStream(process.stdout);
+  stderr.addStream(process.stderr);
+  final exitCode = await process.exitCode;
+  if (exitCode != 0) exit(exitCode);
+}