feat: v0.0.1-dev.17

CHANGELOG.md

@@ -1,3 +1,9 @@
+# 0.0.1-dev.17
+
+- feat: support dart execution inside templates
+- docs: add random_number example
+- fix: handle empty or missing vars in `brick.yaml`
+
 # 0.0.1-dev.16
 
 - **BREAKING**: `mason make` creates subcommands for all available bricks

bricks/random_number/__brick__/RANDOM.md

@@ -0,0 +1,8 @@
+# {{name}}'s Lucky Number is
+
+```dart
+import 'dart:math';
+void main(args, port) {
+  port.send('${Random().nextInt(9999)}');
+}
+```

bricks/random_number/brick.yaml

@@ -0,0 +1,4 @@
+name: random_number
+description: A Simple Random Number Generator
+vars:
+  - name

example/mason.yaml

@@ -5,6 +5,8 @@ bricks:
     path: ../bricks/documentation
   greeting:
     path: ../bricks/greeting
+  random_number:
+    path: ../bricks/random_number
   todos:
     path: ../bricks/todos
   widget:

lib/src/brick_yaml.dart

@@ -9,7 +9,8 @@ part 'brick_yaml.g.dart';
 @JsonSerializable()
 class BrickYaml {
   /// {@macro mason_yaml}
-  const BrickYaml(this.name, this.description, this.vars, {this.path});
+  const BrickYaml(this.name, this.description, {List<String> vars, this.path})
+      : vars = vars ?? const <String>[];
 
   /// Converts [Map] to [BrickYaml]
   factory BrickYaml.fromJson(Map<dynamic, dynamic> json) =>
@@ -41,6 +42,6 @@ class BrickYaml {
   /// Returns a copy of the current [BrickYaml] with
   /// an overridden [path].
   BrickYaml copyWith({String path}) {
-    return BrickYaml(name, description, vars, path: path ?? this.path);
+    return BrickYaml(name, description, vars: vars, path: path ?? this.path);
   }
 }

lib/src/generator.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io' show Directory, File;
+import 'dart:isolate';
 
 import 'package:http/http.dart' as http;
 import 'package:path/path.dart' as p;
@@ -12,6 +13,8 @@ import 'mason_yaml.dart';
 import 'render.dart';
 
 final _fileRegExp = RegExp(r'<%\s?([a-zA-Z]+)\s?%>');
+final _codeRegExp = RegExp(r'```dart(.*)```', dotAll: true);
+final _codeReplaceRegExp = RegExp(r'(```dart(.*)```)', dotAll: true);
 
 /// {@template mason_generator}
 /// A [MasonGenerator] which extends [Generator] and
@@ -99,14 +102,25 @@ abstract class Generator implements Comparable<Generator> {
     Map<String, dynamic> vars,
   }) async {
     await Future.forEach(files, (TemplateFile file) async {
-      final match = _fileRegExp.firstMatch(file.path);
-      if (match != null) {
-        final resultFile = await _fetch(vars[match[1]] as String);
+      final fileMatch = _fileRegExp.firstMatch(file.path);
+      if (fileMatch != null) {
+        final resultFile = await _fetch(vars[fileMatch[1]] as String);
         return target.createFile(resultFile.path, resultFile.content);
-      } else {
-        final resultFile = file.runSubstitution(vars ?? <String, dynamic>{});
+      }
+
+      final codeMatch = _codeRegExp.firstMatch(file.content);
+      if (codeMatch != null) {
+        final result = await _exec(codeMatch[1]);
+        final newFile = TemplateFile(
+          file.path,
+          file.content.replaceFirst(_codeReplaceRegExp, result),
+        );
+        final resultFile = newFile.runSubstitution(vars ?? <String, dynamic>{});
         return target.createFile(resultFile.path, resultFile.content);
       }
+
+      final resultFile = file.runSubstitution(vars ?? <String, dynamic>{});
+      return target.createFile(resultFile.path, resultFile.content);
     });
   }
 
@@ -131,6 +145,19 @@ abstract class Generator implements Comparable<Generator> {
       return FileContents(target, response.bodyBytes);
     }
   }
+
+  Future<String> _exec(String source) async {
+    final uri = _toDartDataUri(source);
+    RawReceivePort receivePort;
+    final completer = Completer<String>();
+    receivePort = RawReceivePort((String message) {
+      completer.complete(message);
+      receivePort.close();
+    });
+    await Isolate.spawnUri(uri, [], receivePort.sendPort);
+    final content = await completer.future;
+    return content;
+  }
 }
 
 /// {@template directory_generator_target}
@@ -207,3 +234,8 @@ class FileContents {
   /// The contents of the file.
   final List<int> content;
 }
+
+Uri _toDartDataUri(String source) {
+  return Uri.parse('data:application/dart;charset=utf-8,'
+      '${Uri.encodeComponent(source)}');
+}

pubspec.yaml

@@ -1,7 +1,7 @@
 name: mason
 description: >
   A Dart template generator which helps teams generate files quickly and consistently.
-version: 0.0.1-dev.16
+version: 0.0.1-dev.17
 homepage: https://github.com/felangel/mason
 
 environment: