pkg/polymer/bin/new_entry.dart - sdk.git - Git at Google

 ///
 /// Script to create boilerplate for a Polymer element.
 /// Produces new .html entry point for a polymer app and updates the
 /// pubspec.yaml to reflect it.
 ///
 /// Run this script with pub run:
 ///
 ///     pub run polymer:new_entry <html_file>
 ///
 import 'dart:io';
 import 'package:args/args.dart';
 import 'package:path/path.dart' as path;
 import 'package:yaml/yaml.dart';
 import 'package:source_span/source_span.dart';

 void printUsage() {
   print('pub run polymer:new_entry entry_point_file.html');
 }

 void main(List<String> args) {
   var parser = new ArgParser(allowTrailingOptions: true);
   parser.addFlag('help', abbr: 'h');
   var entryPoint;

   try {
     var options = parser.parse(args);
     if (options['help']) {
       printUsage();
       return;
     }
     entryPoint = options.rest[0];
   } catch(e) {
     print('$e\n');
     printUsage();
     exitCode = 1;
     return;
   }

   // If the entrypoint file has no extension, add .html to it.
   if (path.extension(entryPoint) == '') {
     entryPoint = '${entryPoint}.html';
   }

   var outputDir = path.dirname(entryPoint);
   var outputDirLocation = new Directory(outputDir);

   if (!outputDirLocation.existsSync()) {
     outputDirLocation.createSync(recursive: true);
   }

   outputDir = outputDirLocation.resolveSymbolicLinksSync();
   var pubspecDir = _findDirWithFile(outputDir, 'pubspec.yaml');

   if (pubspecDir == null) {
     print('Could not find pubspec.yaml when walking up from $outputDir');
     exitCode = 1;
     return;
   }

   var relativeEntryPoint = path.relative(
       path.join(outputDir, path.basename(entryPoint)), from: pubspecDir);

   try {
     if (_createBoilerPlate(relativeEntryPoint, pubspecDir)) {
       print('Added $entryPoint to ${path.join(pubspecDir, "pubspec.yaml")}');
     }
     print('Successfully created:');
     print('  ' + path.join(pubspecDir, entryPoint));
   } catch(e, t) {
     print('Exception: $e\n$t');
     print('Error creating files in $outputDir');
     exitCode = 1;
   }

   return;
 }

 String _findDirWithFile(String dir, String filename) {
   while (!new File(path.join(dir, filename)).existsSync()) {
     var parentDir = path.dirname(dir);
     // If we reached root and failed to find it, bail.
     if (parentDir == dir) return null;
     dir = parentDir;
   }
   return dir;
 }

 // Returns true if the pubspec file was modified. It might not be modified if
 // there was a monolithic polymer transformer in the pubspec, or if the entry
 // point for some reason already existed in the pubspec.
 bool _createBoilerPlate(String entryPoint, String pubspecDir) {

 String html = '''
 <!doctype html>
 <html>
   <head>
     <script src="packages/web_components/platform.js"></script>
     <script src="packages/web_components/dart_support.js"></script>

     <!-- link rel="import" href="path_to_html_import.html" -->
   </head>
   <body>
     <!-- HTML for body here -->
     <script type="application/dart">export 'package:polymer/init.dart';</script>
   </body>
 </html>
 ''';

   new File(path.join(pubspecDir, entryPoint)).writeAsStringSync(html);

   var pubspecPath = path.join(pubspecDir, 'pubspec.yaml');
   var pubspecText = new File(pubspecPath).readAsStringSync();
   var transformers = loadYaml(pubspecText)['transformers'];
   var entryPoints;

   var insertionPoint;
   var textToInsert = '';

   if (transformers != null) {
     // If there are transformers in the pubspec, look for the polymer
     // transformers, get the entry points, and delete the old entry points.
     var transformersSourceSpan = transformers.span;
     SourceSpan sourceSpan;

     for (var e in transformers) {
       if (e != 'polymer' && (e is! YamlMap || e['polymer'] == null)) continue;
       if (e == 'polymer' || !e['polymer'].containsKey('entry_points')) {
         if (path.split(entryPoint)[0] != 'web') {
           print('WARNING: Did not add entry_point $entryPoint to pubspec.yaml'
               ' because of already-existing transformer|polymer section');
         }
         return false;
       } else if (e['polymer'].keys.length > 1) {
         // TODO(dgrove): handle the case where there are additional sections
         // in the polymer transformer.
         throw new UnimplementedError('Cannot handle non-entry_point entries '
             'for polymer transformer');
       } else {
         var existing = e['polymer']['entry_points'];
         entryPoints = (existing == null ? [] :
             (existing is String ? [existing] : existing.toList()));

         if (entryPoints.contains(entryPoint)) return false;
         entryPoints.add(entryPoint);

         sourceSpan = e.span;
       }
     }

     if (sourceSpan == null) {
       // There were no polymer transformers.
       insertionPoint = transformersSourceSpan.start.offset;
       textToInsert = '- ';
     } else {
       insertionPoint = sourceSpan.start.offset;
       pubspecText = '${pubspecText.substring(0, insertionPoint)}'
           '${pubspecText.substring(sourceSpan.end.offset)}';
     }
   } else {
     // There were no transformers at all.
     insertionPoint = pubspecText.length;
     textToInsert = 'transformers:\n- ';
     entryPoints = [entryPoint];
   }

   // TODO(dgrove): Once dartbug.com/20409 is addressed, use that here.
   var entryPointsText = entryPoints.map((e) => '    - $e').join('\n');

   textToInsert =
 '''${textToInsert}polymer:
     entry_points:
 $entryPointsText''';


   if (insertionPoint == pubspecText.length) {
     pubspecText = '${pubspecText}${textToInsert}';
   } else {
     pubspecText = '${pubspecText.substring(0, insertionPoint)}'
         '${textToInsert}\n${pubspecText.substring(insertionPoint)}';
   }

   _writePubspec(pubspecPath, pubspecText);
   return true;
 }

 _writePubspec(String pubspecPath, String text) {
   new File(pubspecPath).writeAsStringSync(text);
 }
	///
	/// Script to create boilerplate for a Polymer element.
	/// Produces new .html entry point for a polymer app and updates the
	/// pubspec.yaml to reflect it.
	///
	/// Run this script with pub run:
	///
	/// pub run polymer:new_entry <html_file>
	///
	import 'dart:io';
	import 'package:args/args.dart';
	import 'package:path/path.dart' as path;
	import 'package:yaml/yaml.dart';
	import 'package:source_span/source_span.dart';

	void printUsage() {
	print('pub run polymer:new_entry entry_point_file.html');
	}

	void main(List<String> args) {
	var parser = new ArgParser(allowTrailingOptions: true);
	parser.addFlag('help', abbr: 'h');
	var entryPoint;

	try {
	var options = parser.parse(args);
	if (options['help']) {
	printUsage();
	return;
	}
	entryPoint = options.rest[0];
	} catch(e) {
	print('$e\n');
	printUsage();
	exitCode = 1;
	return;
	}

	// If the entrypoint file has no extension, add .html to it.
	if (path.extension(entryPoint) == '') {
	entryPoint = '${entryPoint}.html';
	}

	var outputDir = path.dirname(entryPoint);
	var outputDirLocation = new Directory(outputDir);

	if (!outputDirLocation.existsSync()) {
	outputDirLocation.createSync(recursive: true);
	}

	outputDir = outputDirLocation.resolveSymbolicLinksSync();
	var pubspecDir = _findDirWithFile(outputDir, 'pubspec.yaml');

	if (pubspecDir == null) {
	print('Could not find pubspec.yaml when walking up from $outputDir');
	exitCode = 1;
	return;
	}

	var relativeEntryPoint = path.relative(
	path.join(outputDir, path.basename(entryPoint)), from: pubspecDir);

	try {
	if (_createBoilerPlate(relativeEntryPoint, pubspecDir)) {
	print('Added $entryPoint to ${path.join(pubspecDir, "pubspec.yaml")}');
	}
	print('Successfully created:');
	print(' ' + path.join(pubspecDir, entryPoint));
	} catch(e, t) {
	print('Exception: $e\n$t');
	print('Error creating files in $outputDir');
	exitCode = 1;
	}

	return;
	}

	String _findDirWithFile(String dir, String filename) {
	while (!new File(path.join(dir, filename)).existsSync()) {
	var parentDir = path.dirname(dir);
	// If we reached root and failed to find it, bail.
	if (parentDir == dir) return null;
	dir = parentDir;
	}
	return dir;
	}

	// Returns true if the pubspec file was modified. It might not be modified if
	// there was a monolithic polymer transformer in the pubspec, or if the entry
	// point for some reason already existed in the pubspec.
	bool _createBoilerPlate(String entryPoint, String pubspecDir) {

	String html = '''
	<!doctype html>
	<html>
	<head>
	<script src="packages/web_components/platform.js"></script>
	<script src="packages/web_components/dart_support.js"></script>

	<!-- link rel="import" href="path_to_html_import.html" -->
	</head>
	<body>
	<!-- HTML for body here -->
	<script type="application/dart">export 'package:polymer/init.dart';</script>
	</body>
	</html>
	''';

	new File(path.join(pubspecDir, entryPoint)).writeAsStringSync(html);

	var pubspecPath = path.join(pubspecDir, 'pubspec.yaml');
	var pubspecText = new File(pubspecPath).readAsStringSync();
	var transformers = loadYaml(pubspecText)['transformers'];
	var entryPoints;

	var insertionPoint;
	var textToInsert = '';

	if (transformers != null) {
	// If there are transformers in the pubspec, look for the polymer
	// transformers, get the entry points, and delete the old entry points.
	var transformersSourceSpan = transformers.span;
	SourceSpan sourceSpan;

	for (var e in transformers) {
	if (e != 'polymer' && (e is! YamlMap \|\| e['polymer'] == null)) continue;
	if (e == 'polymer' \|\| !e['polymer'].containsKey('entry_points')) {
	if (path.split(entryPoint)[0] != 'web') {
	print('WARNING: Did not add entry_point $entryPoint to pubspec.yaml'
	' because of already-existing transformer\|polymer section');
	}
	return false;
	} else if (e['polymer'].keys.length > 1) {
	// TODO(dgrove): handle the case where there are additional sections
	// in the polymer transformer.
	throw new UnimplementedError('Cannot handle non-entry_point entries '
	'for polymer transformer');
	} else {
	var existing = e['polymer']['entry_points'];
	entryPoints = (existing == null ? [] :
	(existing is String ? [existing] : existing.toList()));

	if (entryPoints.contains(entryPoint)) return false;
	entryPoints.add(entryPoint);

	sourceSpan = e.span;
	}
	}

	if (sourceSpan == null) {
	// There were no polymer transformers.
	insertionPoint = transformersSourceSpan.start.offset;
	textToInsert = '- ';
	} else {
	insertionPoint = sourceSpan.start.offset;
	pubspecText = '${pubspecText.substring(0, insertionPoint)}'
	'${pubspecText.substring(sourceSpan.end.offset)}';
	}
	} else {
	// There were no transformers at all.
	insertionPoint = pubspecText.length;
	textToInsert = 'transformers:\n- ';
	entryPoints = [entryPoint];
	}

	// TODO(dgrove): Once dartbug.com/20409 is addressed, use that here.
	var entryPointsText = entryPoints.map((e) => ' - $e').join('\n');

	textToInsert =
	'''${textToInsert}polymer:
	entry_points:
	$entryPointsText''';


	if (insertionPoint == pubspecText.length) {
	pubspecText = '${pubspecText}${textToInsert}';
	} else {
	pubspecText = '${pubspecText.substring(0, insertionPoint)}'
	'${textToInsert}\n${pubspecText.substring(insertionPoint)}';
	}

	_writePubspec(pubspecPath, pubspecText);
	return true;
	}

	_writePubspec(String pubspecPath, String text) {
	new File(pubspecPath).writeAsStringSync(text);
	}