deploy.sh

#!/bin/bash
# From https://gist.github.com/bmpvieira/ae0d9f9e6cff3df831cc5b6511207138 and modified
set -e # Exit with nonzero exit code if anything fails

SOURCE_BRANCH="master"
TARGET_BRANCH="gh-pages"

function doCompile {
  ./compile.sh
}

echo "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

echo "Save some useful information"
REPO=`git config remote.origin.url`
SSH_REPO=${REPO/https:\/\/github.com\//git@github.com:}
SHA=`git rev-parse --verify HEAD`

echo "Clone the existing gh-pages for this repo into out/"
echo "Create a new empty branch if gh-pages doesn't exist yet (should only happen on first deply)"
git clone $REPO out
cd out
git checkout $TARGET_BRANCH || git checkout --orphan $TARGET_BRANCH
cd ..

echo "Clean out existing contents"
rm -rf out/**/* || exit 0

echo "Run our compile script"
doCompile

echo "Now let's go have some fun with the cloned repo"
cd out
git config user.name "Travis CI"
git config user.email "$COMMIT_AUTHOR_EMAIL"

echo "If there are no changes to the compiled out (e.g. this is a README update) then just bail."
if [[ -z `git diff --exit-code` ]]; then
    echo "No changes to the output on this push; exiting."
    exit 0
fi

echo 'Commit the "changes", i.e. the new version.'
echo "The delta will show diffs between new and old versions."
git add --all .
git commit -m "Deploy to GitHub Pages: ${SHA}"

echo "Get the deploy key by using Travis's stored variables to decrypt deploy_key.enc"
ENCRYPTED_KEY_VAR="encrypted_${ENCRYPTION_LABEL}_key"
ENCRYPTED_IV_VAR="encrypted_${ENCRYPTION_LABEL}_iv"
ENCRYPTED_KEY=${!ENCRYPTED_KEY_VAR}
ENCRYPTED_IV=${!ENCRYPTED_IV_VAR}
openssl aes-256-cbc -K $ENCRYPTED_KEY -iv $ENCRYPTED_IV -in deploy_key.enc -out deploy_key -d
chmod 600 deploy_key
eval `ssh-agent -s`
ssh-add deploy_key

echo "Now that we're all set up, we can push."
git push $SSH_REPO $TARGET_BRANCH --force