Deploy Hexo blog using Travis.

.travis.yml

# Deploy hexo site by travis-ci
# https://github.com/jkeylu/deploy-hexo-site-by-travis-ci
# LICENSE: MIT
#
# 1. Copy this file to the root of your repository, then rename it to '.travis.yml'
# 2. Replace 'YOUR NAME' and 'YOUR EMAIL' at line 29
# 3. Add an Environment Variable 'DEPLOY_REPO'
#     1. Generate github access token on https://github.com/settings/applications#personal-access-tokens
#     2. Add an Environment Variable on https://travis-ci.org/{github username}/{repository name}/settings/env_vars
#         Variable Name: DEPLOY_REPO
#         Variable Value: https://{githb access token}@github.com/{github username}/{repository name}.git
#         Example: DEPLOY_REPO=https://6b75cfe9836f56e6d21187622730889874476c23@github.com/jkeylu/test-hexo-on-travis-ci.git
# 4. Make sure Travis is configured to hide your Variable, else others will see your access token and can mess with all your repos.

language: node_js

# Every once in a while this should be bumped up
# https://docs.travis-ci.com/user/languages/javascript-with-nodejs#Choosing-Node-versions-to-test-against
node_js:
- "6"

# Only create a new version on pushes to certain branches.
branches:
  only:
  - master

before_install:
- npm install -g hexo

install:
- npm install

# Notice: Replace 'YOUR NAME' and 'YOUR EMAIL'
before_script:
- git config --global user.name 'Travis'
- git config --global user.email 'travis@no-email.com'
# - git clone git://github.com/heroicyang/hexo-theme-modernist.git themes/modernist

# Maybe add minification scripts here
script:
- hexo generate

after_success:
- mkdir .deploy                   # Create a folder to use for teh pages branch
- cd .deploy
- git clone --depth 1 --branch gh-pages --single-branch $DEPLOY_REPO . || (git init && git remote add -t gh-pages origin $DEPLOY_REPO)
- rm -rf ./*                      # Clear old verion
- cp -r ../public/* .             # Copy over files for new version
- git add -A .          
- git commit -m 'Site updated'    # Make a new commit for new version
- git branch -m gh-pages
- git push -q -u origin gh-pages  # Push silently so we don't leak information