Have Travis CI build static site from source files

.gitignore

@@ -7,3 +7,4 @@ Gemfile.lock
 node_modules
 package.json
 .idea/
+deploy_key

.travis.yml

@@ -0,0 +1,17 @@
+language: ruby
+branches:
+  only:
+  - source
+rvm:
+- 2.3.4
+before_install:
+- openssl aes-256-cbc -K $encrypted_1dd176ece64a_key -iv $encrypted_1dd176ece64a_iv -in deploy_key.enc -out deploy_key -d
+before_script:
+- chmod +x ./deploy.sh
+script: bash ./deploy.sh
+exclude:
+- vendor
+sudo: false
+env:
+  global:
+  - COMMIT_AUTHOR_EMAIL: watir.team@gmail.com

_config.yml

@@ -116,6 +116,8 @@ exclude:
   - Gemfile.lock
   - LICENSE
   - README.md
-  - CNAME
+  - deploy.sh
+  - deploy_key.enc
+  - deploy_key
 include:
   - _pages

deploy.sh

@@ -0,0 +1,59 @@
+#!/bin/bash
+
+# https://ayastreb.me/deploy-jekyll-to-github-pages-with-travis-ci/
+# https://gist.github.com/domenic/ec8b0fc8ab45f39403dd
+
+set -e # Exit with nonzero exit code if anything fails
+
+SOURCE_BRANCH="source"
+TARGET_BRANCH="master"
+
+function doCompile {
+  bundle exec jekyll build
+}
+
+# Pull requests and commits to other branches shouldn't try to deploy, just build to verify
+if [ "$TRAVIS_PULL_REQUEST" != "false" -o "$TRAVIS_BRANCH" != "$SOURCE_BRANCH" ]; then
+    echo "Skipping deploy; just doing a build."
+    doCompile
+    exit 0
+fi
+
+# Save some useful information
+REPO=`git config remote.origin.url`
+SSH_REPO=${REPO/https:\/\/github.com\//git@github.com:}
+
+echo "Make sure source doesn't have _site data"
+rm -rf _site
+
+echo "Clone the existing code for this repo into _site/"
+git clone $REPO _site
+
+echo "Build content with Jekyll"
+doCompile
+
+echo "Set Git information"
+cd _site
+git config user.name "Travis CI"
+git config user.email "$COMMIT_AUTHOR_EMAIL"
+
+# If there are no changes to the compiled out (e.g. this is a README update) then just bail.
+if git diff --quiet -- . ':(exclude)*.xml'; then
+    echo "No changes to the output on this push; exiting."
+    exit 0
+fi
+
+echo "Commit the changes"
+# The delta will show diffs between new and old versions.
+git add -A .
+git commit -m "Deploy Generated Content from Travis Build ${TRAVIS_BUILD_NUMBER}"
+
+echo "Set permissions for the Key"
+chmod 600 ../deploy_key
+
+echo "SSH Add key"
+eval `ssh-agent -s`
+ssh-add ../deploy_key
+
+echo "Push to Repo"
+git push $SSH_REPO