publishPr.sh

#!/usr/bin/env bash
#execute this only when pull requesting to master, or pushing to master
export GH_BRANCH=gh-pages
if [ ${GH_TOKEN} ]; then
        set -e

        # remove folder with github pages branch and recreate it
        rm -rf "../${GH_BRANCH}"
        git clone -b ${GH_BRANCH} "https://${GH_REF}.git" "../${GH_BRANCH}"
        rm -rf "../${GH_BRANCH}/${TRAVIS_PULL_REQUEST}"
        mkdir "../${GH_BRANCH}/${TRAVIS_PULL_REQUEST}"

        # copy dist/ folder to gh-pages folder and chenge to it
        cp ./dist/* "../${GH_BRANCH}/${TRAVIS_PULL_REQUEST}/" -rf 2>/dev/null || :
        cd "../${GH_BRANCH}"

        # add whole repo (currently only contains of dist/prId)
        git add .
        git config user.name "Publish PR"
        git config user.email "<your@email.com>"
        git commit -m "Deploy to GitHub Pages"

        # Force push from the current repo's master branch to the remote
        # repo's gh-pages branch. (All previous history on the gh-pages branch
        # will be lost, since we are overwriting it.) We redirect any output to
        # /dev/null to hide any sensitive credential data that might otherwise be exposed.
        # tokens GH_TOKEN and GH_REF will be provided as Travis CI environment variables
        git push --quiet "https://${GH_TOKEN}@${GH_REF}.git"
fi