Add workflow to deploy the sample index (#791)

* Add workflow to build and deploy the sample index

* update gh-pages action

* fix yaml

* create web/ directory in build

* grammar

* add ignored directories

* revert pubspec.lock files

* add job to run _tool/verify_samples.dart

* Update filipino_cuisine for Flutter 2

* remove timeflow demo.

The unnamed List constructor is now deprecated, refactoring
this code to use add() requires more knowledge about the code for
this demo.
https://dart.dev/null-safety/understanding-null-safety#no-unnamed-list-constructor

* update slide_puzzle

* ensure stable channel is used to verify

* move verify web demos action into separate yaml file - avoid running
on each flutter version.

* add on: pull_request

* update slide_puzzle

* Update gh-pages.yml

* Add copyright header

web/_tool/build_ci.dart

@@ -0,0 +1,43 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file
+
+import 'dart:io';
+import 'package:path/path.dart' as p;
+import 'common.dart';
+
+final ignoredDirectories = ['_tool', 'samples_index'];
+
+main() async {
+  final packageDirs = [
+    ...listPackageDirs(Directory.current)
+        .map((path) => p.relative(path, from: Directory.current.path))
+        .where((path) => !ignoredDirectories.contains(path))
+  ];
+
+  print('Building the sample index...');
+  await run('samples_index', 'pub', ['get']);
+  await run('samples_index', 'pub', ['run', 'grinder', 'deploy']);
+
+  // Create the directory each Flutter Web sample lives in
+  Directory(p.join(Directory.current.path, 'samples_index', 'public', 'web'))
+      .createSync(recursive: true);
+
+  for (var i = 0; i < packageDirs.length; i++) {
+    var directory = packageDirs[i];
+
+    logWrapped(ansiMagenta, '\n$directory (${i + 1} of ${packageDirs.length})');
+
+    // Create the target directory
+    var directoryName = p.basename(directory);
+    var sourceBuildDir =
+        p.join(Directory.current.path, directory, 'build', 'web');
+    var targetDirectory = p.join(Directory.current.path, 'samples_index',
+        'public', 'web', directoryName);
+
+    // Build the sample and copy the files
+    await run(directory, 'flutter', ['pub', 'get']);
+    await run(directory, 'flutter', ['build', 'web']);
+    await run(directory, 'mv', [sourceBuildDir, targetDirectory]);
+  }
+}

web/_tool/common.dart

@@ -36,3 +36,16 @@ Future<bool> run(
 void logWrapped(int code, String message) {
   print('\x1B[${code}m$message\x1B[0m');
 }
+
+Iterable<String> listPackageDirs(Directory dir) sync* {
+  if (File('${dir.path}/pubspec.yaml').existsSync()) {
+    yield dir.path;
+  } else {
+    for (var subDir in dir
+        .listSync(followLinks: true)
+        .whereType<Directory>()
+        .where((d) => !Uri.file(d.path).pathSegments.last.startsWith('.'))) {
+      yield* listPackageDirs(subDir);
+    }
+  }
+}

web/_tool/verify_packages.dart

@@ -5,14 +5,11 @@
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
+
 import 'common.dart';
 
-const _ansiGreen = 32;
-const _ansiRed = 31;
-const _ansiMagenta = 35;
-
 void main() async {
-  final packageDirs = _listPackageDirs(Directory.current)
+  final packageDirs = listPackageDirs(Directory.current)
       .map((path) => p.relative(path, from: Directory.current.path))
       .toList();
 
@@ -21,7 +18,7 @@ void main() async {
   final results = <bool>[];
   for (var i = 0; i < packageDirs.length; i++) {
     final dir = packageDirs[i];
-    logWrapped(_ansiMagenta, '\n$dir (${i + 1} of ${packageDirs.length})');
+    logWrapped(ansiMagenta, '\n$dir (${i + 1} of ${packageDirs.length})');
     results.add(await run(dir, 'flutter', [
       'pub',
       'pub',
@@ -46,19 +43,6 @@ void _printStatus(List<bool> results) {
   var success = (successCount == results.length);
   var pct = 100 * successCount / results.length;
 
-  logWrapped(success ? _ansiGreen : _ansiRed,
+  logWrapped(success ? ansiGreen : ansiRed,
       '$successCount of ${results.length} (${pct.toStringAsFixed(2)}%)');
 }
-
-Iterable<String> _listPackageDirs(Directory dir) sync* {
-  if (File('${dir.path}/pubspec.yaml').existsSync()) {
-    yield dir.path;
-  } else {
-    for (var subDir in dir
-        .listSync(followLinks: true)
-        .whereType<Directory>()
-        .where((d) => !Uri.file(d.path).pathSegments.last.startsWith('.'))) {
-      yield* _listPackageDirs(subDir);
-    }
-  }
-}