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// Copyright 2019 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Called by https://pub.dartlang.org/packages/peanut to generate example pages
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// for hosting.
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//
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// Requires at least v3.2.0 of `package:peanut`
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import 'dart:convert';
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import 'dart:io';
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import 'package:markdown/markdown.dart';
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import 'package:path/path.dart' as p;
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void main(List<String> args) {
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final buildDir = args[0];
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final fileMap =
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(jsonDecode(args[1]) as Map<String, dynamic>).cast<String, String>();
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if (fileMap.length < 2) {
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throw StateError('We are assuming there is more than one sample!');
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}
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// This is USUALLY the case – where we have more than one demo
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for (var exampleDir in fileMap.values) {
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for (var htmlFile in Directory(p.join(buildDir, exampleDir))
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.listSync()
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.whereType<File>()
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.where((f) => p.extension(f.path) == '.html')) {
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_updateHtml(htmlFile, buildDir, exampleDir);
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}
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}
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final tocFile = File(p.join(buildDir, 'index.html'));
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if (!tocFile.existsSync()) {
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throw StateError('$tocFile should exist!');
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}
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tocFile.writeAsStringSync(
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_tocTemplate(
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fileMap.entries.map(
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(entry) => _Demo(
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entry.key,
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entry.value,
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),
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),
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),
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flush: true);
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}
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void _updateHtml(File htmlFile, String buildDir, String exampleDir) {
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final content = htmlFile.readAsStringSync();
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final filePath = p.relative(htmlFile.path, from: buildDir);
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if (!content.contains(_standardMeta)) {
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print('!!! missing standard meta! - $filePath');
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}
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final newContent = content
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.replaceFirst('<head>', '<head>\n$_analytics')
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.replaceFirst(_emptyTitle,
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'<title>${_prettyName(exampleDir)} - Flutter web sample</title>');
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if (newContent == content) {
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print('!!! Did not replace contents in $filePath');
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} else {
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print('Replaced contents in $filePath');
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htmlFile.writeAsStringSync(newContent, flush: true);
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}
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}
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class _Demo {
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final String pkgDir, buildDir;
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_Demo(this.pkgDir, this.buildDir);
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String get content {
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final path = p.normalize(p.join(pkgDir, '..', 'README.md'));
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final readmeFile = File(path);
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if (!readmeFile.existsSync()) {
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print(' $path – No readme!');
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return '';
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}
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var readmeContent = readmeFile.readAsStringSync();
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final tripleLineIndex = readmeContent.indexOf('\n\n\n');
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var secondDoubleIndex = readmeContent.indexOf('\n\n');
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if (secondDoubleIndex >= 0) {
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secondDoubleIndex = readmeContent.indexOf('\n\n', secondDoubleIndex + 1);
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}
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final endIndices =
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([tripleLineIndex, secondDoubleIndex].where((i) => i >= 0).toList()
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..sort());
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final endIndex =
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endIndices.isEmpty ? readmeContent.length : endIndices.first;
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return markdownToHtml(readmeContent.substring(0, endIndex - 1));
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}
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String get name => _prettyName(buildDir);
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String get html => '''
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<div>
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<a href='$buildDir'>
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<img src='${p.url.join(buildDir, 'preview.png')}' width="300" alt="$name">
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</a>
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<a class='demo-title' href='$buildDir'>$name</a>
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<div>
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${_indent(content, 2)}
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</div>
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</div>
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''';
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}
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final _underscoreOrSlash = RegExp('_|/');
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String _prettyName(String input) =>
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input.split(_underscoreOrSlash).where((e) => e.isNotEmpty).map((e) {
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return e.substring(0, 1).toUpperCase() + e.substring(1);
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}).join(' ');
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// flutter.github.io
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const _analyticsId = 'UA-67589403-8';
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const _analytics = '''
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<script async src="https://www.googletagmanager.com/gtag/js?id=$_analyticsId"></script>
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<script>
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window.dataLayer = window.dataLayer || [];
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function gtag(){dataLayer.push(arguments);}
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gtag('js', new Date());
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gtag('config', '$_analyticsId');
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</script>''';
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String _indent(String content, int spaces) =>
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LineSplitter.split(content).join('\n' + ' ' * spaces);
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const _itemsReplace = r'<!-- ITEMS -->';
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const _emptyTitle = '<title></title>';
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const _standardMeta = '''
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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$_emptyTitle''';
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String _tocTemplate(Iterable<_Demo> items) => '''
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<!DOCTYPE html>
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<html lang="en">
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<head>
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${_indent(_analytics, 2)}
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$_standardMeta
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<meta name="generator" content="https://pub.dartlang.org/packages/peanut">
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<style>
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body {
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font-family: "Google Sans", "Roboto", sans-serif;
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text-align: center;
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}
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a {
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text-decoration: none;
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color: #1389FD;
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}
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a:hover {
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text-decoration: underline;
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}
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#toc {
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text-align: left;
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display: flex;
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flex-wrap: wrap;
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align-self: center;
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margin: 0 auto;
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align-content: space-between;
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justify-content: center;
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}
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#toc > div {
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width: 300px;
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padding: 1rem;
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margin: 0.5rem;
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border: 1px solid rgba(0, 0, 0, 0.125);
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border-radius: 4px;
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}
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#toc > div img {
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display: block;
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margin: 0 auto 1rem;
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}
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.demo-title {
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font-size: 1.25rem;
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}
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#toc > div p {
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margin-top: 0.5rem;
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margin-bottom: 0;
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}
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</style>
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</head>
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<body>
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<h2><a href='https://flutter.dev/web'>Flutter for web</a> samples</h2>
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<a href='https://github.com/flutter/samples/tree/master/web'>Sample source code</a>
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<div id="toc">
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$_itemsReplace
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</div>
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</body>
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</html>
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'''
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.replaceFirst(
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_itemsReplace, _indent(items.map((d) => d.html).join('\n'), 4))
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.replaceFirst(_emptyTitle, '<title>Flutter for web samples</title>');
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