Use gulp-replace to rewrite JS and CSS paths during gzip task.

`index.html.gz` now links properly to gzipped resources allowing
them to be distributed unmodified and without the uncompressed
resources.

Change-Id: I253f5207de5b13a105dfb8ddd226d7da6ba2b34b

README.rst

@@ -39,13 +39,7 @@ distribution. Note that all files are not required:
 - Core files (:code:`index.html`, :code:`js/main.js`, :code:`css/main.css`):
   required unless gzipped versions are used.
 - Gzipped versions of core files (:code:`*.gz`): not required, but preferred.
-  Use instead of plain core files.
-
-  - Note that filenames must have the :code:`.gz` extension removed as links are
-    not currently rewritten to reflect the extension added during the gzip
-    process. TODO: investigate use of
-    `gulp-rebase <https://github.com/tunderdomb/rebase>`_ to avoid this.
-
+  Use instead of plain core files to save on disk usage and bandwidth.
 - Source maps (:code:`js/main.js.map`, :code:`js/main.js.map.gz`): only required
   for debugging purposes.
 

gulp/config.js

@@ -37,6 +37,7 @@ module.exports = {
 
   'gzip': {
     'src': 'build/**/*.{html,xml,json,css,js,js.map}',
+    'rewrite': '**/*.html',
     'dest': 'build/',
     'options': {}
   },

gulp/tasks/gzip.js

@@ -1,12 +1,18 @@
 'use strict';
 
-var gulp   = require('gulp');
-var gzip   = require('gulp-gzip');
-var config = require('../config');
+var gulp    = require('gulp');
+var gzip    = require('gulp-gzip');
+var config  = require('../config');
+var filter  = require('gulp-filter');
+var replace = require('gulp-replace');
 
 gulp.task('gzip', function() {
+  var rewriteFilter = filter(config.gzip.rewrite, { restore: true });
 
   return gulp.src(config.gzip.src)
+    .pipe(rewriteFilter)
+    .pipe(replace(/"((?:css|js)\/.*\.(?:css|js))"/g, '"$1.gz"'))
+    .pipe(rewriteFilter.restore)
     .pipe(gzip(config.gzip.options))
     .pipe(gulp.dest(config.gzip.dest));
 

package.json

@@ -26,6 +26,7 @@
     "gulp-angular-templatecache": "^1.3.0",
     "gulp-autoprefixer": "^2.0.0",
     "gulp-changed": "^1.0.0",
+    "gulp-filter": "^3.0.1",
     "gulp-gzip": "^0.0.8",
     "gulp-if": "^1.2.5",
     "gulp-imagemin": "^1.1.0",
@@ -34,6 +35,7 @@
     "gulp-notify": "^2.0.0",
     "gulp-protractor": "0.0.11",
     "gulp-rename": "^1.2.0",
+    "gulp-replace": "^0.5.4",
     "gulp-sass": "^1.3.3",
     "gulp-sourcemaps": "^1.3.0",
     "gulp-streamify": "0.0.5",