Introduce gulp build to build native/idl files

This change introduces `gulp` build system to build native/idl files. After
this patch, we no longer need to create and modify `gyp/gypi` files to update
the list of native/idl files.

This change includes the following things:
  - Introduce `gulp` build (including some related packages)
  - Stop using `.gypi` files except `generator.gypi`. Once move TSC build to
    `gulp`, then we can remove it as well

ISSUE=#98,#193

binding.gyp

@@ -14,11 +14,7 @@
 
 {
   'includes': [
-    'core/core.gypi',
-    'examples/examples.gypi',
-    'examples/electron/native/electron_native.gypi',
     'generator/generator.gypi',
-    'test/test.gypi',
   ],
 
   'targets': [
@@ -52,13 +48,8 @@
         }],
       ],
       'sources': [
-        '<@(core_cpp_files)',
-        '<@(examples_cpp_files)',
-        '<@(examples_idl_output_files)',
-        '<@(examples_electron_native_cpp_files)',
-        '<@(examples_electron_native_idl_output_files)',
-        '<@(test_cpp_files)',
-        '<@(test_idl_output_files)',
+        '<!@(./bacardi list_cpp_files --silent)',
+        '<!@(./bacardi list_generated_cpp_files --silent)',
         '<(SHARED_INTERMEDIATE_DIR)/bacardi.cc',
       ],
       'defines': [ 'NAPI_DISABLE_CPP_EXCEPTIONS' ],
@@ -109,13 +100,10 @@
         {
           'action_name': 'idl',
           'inputs': [
-            '<@(examples_idl_files)',
-            '<@(examples_electron_native_idl_files)',
-            '<@(test_idl_files)',
+            '<!@(./bacardi list_idl_files --silent)',
           ],
           'outputs': [
-            '<@(examples_electron_native_idl_output_files)',
-            '<@(test_idl_output_files)',
+            '<!@(./bacardi list_generated_cpp_files --silent)',
           ],
           'conditions': [
             ['OS!="win"',

bootstrap/bacardi.sh

@@ -35,9 +35,20 @@ git submodule update
 # Sync third_parties.
 sync_node
 
-# NPM update
-if [ ! -f .last_update ] || [ package.json -nt .last_update ]; then
+# FIXME(zino): If npm packages are updated, then node-gyp will be triggered
+# automatically. To get native/idl file list, we will use ./bacardi list*
+# command again in binding.gyp. Then, it causes infinite loop finally.
+# To avoid the problem, as a workaround, we should filter list* commands here.
+if [ "${1:0:4}" = "list" ]; then
+  gulp $@
+  exit
+fi
+
+# NPM install or update
+if [ ! -f .last_update ]; then
   npm install && > .last_update
+elif [ package.json -nt .last_update ]; then
+  npm update && > .last_update
 fi
 
 for command in $(ls $(bootstrap_command_path)); do
@@ -47,3 +58,5 @@ for command in $(ls $(bootstrap_command_path)); do
     exit
   fi
 done
+
+gulp $@

gulpfile.ts

@@ -0,0 +1,74 @@
+/**
+ * Copyright (c) 2017 The Absolute Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as gulp from 'gulp';
+import * as path from 'path';
+import * as through from 'through2';
+
+gulp.task('default', (callback) => {
+  // FIXME(zino): Should print available commands in Bacardi.
+  return;
+});
+
+/**
+ * This task will be used in binding.gyp to build native files.
+ */
+gulp.task('list_cpp_files', (callback) => {
+  return gulp
+      .src([
+        'core/**/*.h', 'core/**/*.cc', 'examples/**/*.h', 'examples/**/*.cc',
+        'test/**/*.h', 'test/**/*.cc'
+      ])
+      .pipe(printPath());
+});
+
+/**
+ * This task will be used in binding.gyp to build idl files.
+ */
+gulp.task('list_idl_files', (callback) => {
+  return gulp.src(['examples/**/*.idl', 'test/**/*.idl']).pipe(printPath());
+});
+
+/**
+ * This task will be used in binding.gyp to build idl files.
+ */
+gulp.task('list_generated_cpp_files', (callback) => {
+  // FIXME(zino): The following file list should be generated by idl generator
+  // automatically.
+  const genDir = 'build/Release/obj/gen/';
+  const genFiles = [
+    path.join(genDir, 'examples/calculator_bridge.cc'),
+    path.join(genDir, 'examples/calculator_bridge.h'),
+    path.join(genDir, 'examples/ternary_calculator_bridge.cc'),
+    path.join(genDir, 'examples/ternary_calculator_bridge.h'),
+    path.join(genDir, 'examples/electron/native/electron_native_bridge.cc'),
+    path.join(genDir, 'examples/electron/native/electron_native_bridge.h'),
+    path.join(genDir, 'test/test_interface_bridge.cc'),
+    path.join(genDir, 'test/test_interface_bridge.h'),
+  ];
+
+  return genFiles.forEach((file) => {
+    process.stdout.write('"' + file + '"\n');
+  });
+});
+
+/* Custom plugins */
+function printPath() {
+  return through.obj((files, encoding, callback) => {
+    process.stdout.write('"' + path.relative(files.cwd, files.path) + '"\n');
+    callback();
+  });
+}

package.json

@@ -1,17 +1,24 @@
 {
   "devDependencies": {
+    "@types/gulp": "^4.0.5",
+    "@types/gulp-typescript": "^2.13.0",
     "@types/jest": "^21.1.2",
     "@types/node": "^8.0.24",
+    "@types/through2": "^2.0.33",
     "bindings": "^1.3.0",
     "change-case": "^3.0.1",
     "electron": "^1.7.8",
     "electron-rebuild": "^1.6.0",
+    "gulp": "^3.9.1",
+    "gulp-typescript": "^3.2.3",
     "jest": "^21.2.1",
     "mkdirp": "^0.5.1",
     "node-addon-api": "^1.0.0",
     "node-gyp": "^3.6.2",
     "nunjucks": "^3.0.1",
+    "through2": "^2.0.3",
     "ts-jest": "^21.1.0",
+    "ts-node": "^3.3.0",
     "typescript": "^2.4.2",
     "webidl2": "^4.1.0"
   },