Create Gulp tasks that process stylesheets

build/style.js

@@ -0,0 +1,70 @@
+// Copyright 2015 Google Inc.
+//
+// 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.
+
+/**
+ * @fileoverview Gulp tasks for processing stylesheets.
+ */
+import browserSync from 'browser-sync';
+import gulp from 'gulp';
+import gulpAutoprefixer from 'gulp-autoprefixer';
+import gulpFilter from 'gulp-filter';
+import gulpMinifyCss from 'gulp-minify-css';
+import gulpSourcemaps from 'gulp-sourcemaps';
+import gulpSass from 'gulp-sass';
+import path from 'path';
+import gulpConcat from 'gulp-concat';
+
+import conf from './conf';
+
+
+/**
+ * Compiles stylesheets and places them into the serve folder. Each stylesheet file is compiled
+ * separately.
+ */
+gulp.task('styles', function () {
+  let sassOptions = {
+    style: 'expanded'
+  };
+
+  let cssFilter = gulpFilter('**/*.css', { restore: true });
+
+  return gulp.src(path.join(conf.paths.frontendSrc, '**/*.scss'))
+    .pipe(gulpSass(sassOptions))
+    .pipe(cssFilter)
+    .pipe(gulpSourcemaps.init({ loadMaps: true }))
+    .pipe(gulpAutoprefixer())
+    .pipe(gulpSourcemaps.write())
+    .pipe(cssFilter.restore)
+    .pipe(gulp.dest(conf.paths.serve))
+    // If BrowserSync is running, inform it that styles have changed.
+    .pipe(browserSync.stream());
+});
+
+
+/**
+ * Compiles stylesheets and places them into the prod tmp folder. Styles are compiled and minified
+ * into a single file.
+ */
+gulp.task('styles:prod', function () {
+  let sassOptions = {
+    style: 'compressed'
+  };
+
+  return gulp.src(path.join(conf.paths.frontendSrc, '**/*.scss'))
+    .pipe(gulpSass(sassOptions))
+    .pipe(gulpAutoprefixer())
+    .pipe(gulpConcat('app.css'))
+    .pipe(gulpMinifyCss())
+    .pipe(gulp.dest(conf.paths.prodTmp))
+});