Deploy dist files and bower.json (tags)

Add a new Travis deploy task to push dist/*.js and bower.json files into tag sources:
- requires Travis GITHUB_AUTH_TOKEN and GITHUB_AUTH_EMAIL environment variables
- skipped if not built from the "release" branch
- release.sh must be executable (see comment)
- reads tag version from package.json
- fails if tag already exists

.gitignore

@@ -1,3 +1,5 @@
 /dist
 /node_modules
 .DS_Store
+bower.json
+/.vscode

.travis.yml

@@ -6,11 +6,21 @@ script:
 - gulp lint
 - gulp build
 - gulp package
+- gulp bower
 
 deploy:
-  provider: releases
-  api_key:
-    secure: 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
+# Creates a tag containing dist files and bower.json
+# Requires GITHUB_AUTH_TOKEN and GITHUB_AUTH_EMAIL environment variables
+# IMPORTANT: the script has to be set executable in the Git repository (error 127)
+# https://github.com/travis-ci/travis-ci/issues/5538#issuecomment-225025939
+# http://stackoverflow.com/a/15572639
+- provider: script
+  script: ./scripts/release.sh
+  skip_cleanup: true
+  on:
+    branch: release
+- provider: releases
+  api_key: $GITHUB_AUTH_TOKEN
   file:
   - "./dist/Chart.Deferred.js"
   - "./dist/Chart.Deferred.min.js"

gulpfile.js

@@ -2,6 +2,7 @@ var argv = require('yargs').argv
 var gulp = require('gulp');
 var eslint = require('gulp-eslint');
 var insert = require('gulp-insert');
+var file = require('gulp-file');
 var rename = require('gulp-rename');
 var replace = require('gulp-replace');
 var streamify = require('gulp-streamify');
@@ -29,6 +30,7 @@ var header = "/*!\n\
 gulp.task('build', buildTask);
 gulp.task('lint', lintTask);
 gulp.task('package', packageTask);
+gulp.task('bower', bowerTask);
 gulp.task('default', ['build']);
 
 function watch(glob, task) {
@@ -86,3 +88,17 @@ function packageTask() {
   .pipe(zip('Chart.Deferred.js.zip'))
   .pipe(gulp.dest(outDir));
 }
+
+function bowerTask() {
+  var json = JSON.stringify({
+      name: package.name,
+      description: package.description,
+      homepage: package.homepage,
+      license: package.license,
+      version: package.version,
+      main: outDir + "Chart.Deferred.js"
+    }, null, 2);
+
+  return file('bower.json', json, { src: true })
+    .pipe(gulp.dest('./'));
+}

package.json

@@ -11,8 +11,9 @@
   },
   "devDependencies": {
     "gulp": "^3.9.1",
-    "gulp-eslint": "^2.0.0",
+    "gulp-eslint": "^2.1.0",
     "gulp-insert": "^0.5.0",
+    "gulp-file": "^0.3.0",
     "gulp-replace": "^0.5.4",
     "gulp-rename": "^1.2.2",
     "gulp-streamify": "^1.0.2",

scripts/release.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+set -e
+
+if [ "$TRAVIS_BRANCH" != "release" ]; then
+    echo "Skipping release because this is not the 'release' branch"
+    exit 0
+fi
+
+# Travis executes this script from the repository root, so at the same level than package.json
+VERSION=$(node -p -e "require('./package.json').version")
+
+# Make sure that the associated tag doesn't already exist
+GITTAG=$(git ls-remote origin refs/tags/v$VERSION)
+if [ "$GITTAG" != "" ]; then
+    echo "Tag for package.json version already exists, aborting release"
+    exit 1
+fi
+
+git remote add auth-origin https://$GITHUB_AUTH_TOKEN@github.com/$TRAVIS_REPO_SLUG.git
+git config --global user.email "$GITHUB_AUTH_EMAIL"
+git config --global user.name "Chart.js"
+git checkout --detach --quiet
+git add -f dist/*.js bower.json
+git commit -m "Release $VERSION"
+git tag -a "v$VERSION" -m "Version $VERSION"
+git push -q auth-origin refs/tags/v$VERSION 2>/dev/null
+git remote rm auth-origin
+git checkout -f @{-1}