Added Rakefile for travis-ci.

Author: biomadeira

Rakefile

@@ -0,0 +1,78 @@
+#############################################################################
+#
+# Modified version of jekyllrb Rakefile
+# https://github.com/jekyll/jekyll/blob/master/Rakefile
+#
+#############################################################################
+
+require 'rake'
+require 'date'
+require 'yaml'
+
+CONFIG = YAML.load(File.read('_config.yml'))
+USERNAME = CONFIG["username"]
+REPO = CONFIG["repo"]
+SOURCE_BRANCH = CONFIG["branch"]
+DESTINATION_BRANCH = "gh-pages"
+
+def check_destination
+  unless Dir.exist? CONFIG["destination"]
+    sh "git clone https://$GIT_NAME:[email protected]/#{USERNAME}/#{REPO}.git #{CONFIG["destination"]}"
+  end
+end
+
+namespace :site do
+  desc "Generate the site"
+  task :build do
+    check_destination
+    sh "bundle exec jekyll build"
+  end
+
+  desc "Generate the site and serve locally"
+  task :serve do
+    check_destination
+    sh "bundle exec jekyll serve"
+  end
+
+  desc "Generate the site, serve locally and watch for changes"
+  task :watch do
+    sh "bundle exec jekyll serve --watch"
+  end
+
+  desc "Generate the site and push changes to remote origin"
+  task :deploy do
+    # Detect pull request
+    if ENV['TRAVIS_PULL_REQUEST'].to_s.to_i > 0
+      puts 'Pull request detected. Not proceeding with deploy.'
+      exit
+    end
+
+    # Configure git if this is run in Travis CI
+    if ENV["TRAVIS"]
+      sh "git config --global user.name $GIT_NAME"
+      sh "git config --global user.email $GIT_EMAIL"
+      sh "git config --global push.default simple"
+    end
+
+    # Make sure destination folder exists as git repo
+    check_destination
+
+    sh "git checkout #{SOURCE_BRANCH}"
+    Dir.chdir(CONFIG["destination"]) { sh "git checkout #{DESTINATION_BRANCH}" }
+
+    # Generate the site
+    sh "bundle exec jekyll build"
+
+    # Commit and push to github
+    sha = `git log`.match(/[a-z0-9]{40}/)[0]
+    Dir.chdir(CONFIG["destination"]) do
+      # check if there is anything to add and commit, and pushes it
+      sh "if [ -n '$(git status)' ]; then
+            git add --all .;
+            git commit -m 'Updating to #{USERNAME}/#{REPO}@#{sha}.';
+            git push --quiet origin #{DESTINATION_BRANCH};
+         fi"
+      puts "Pushed updated branch #{DESTINATION_BRANCH} to GitHub Pages"
+    end
+  end
+end