deploy.sh

#!/bin/bash
set -o errexit -o nounset
PKG_REPO=$PWD
cd ..

addToDrat(){
  mkdir drat; cd drat

  ## Set up Repo parameters
  git init
  git config user.name "Hugh Parsonage"
  git config user.email "hugh.parsonage@gmail.com"
  git config --global push.default simple

  ## Get drat repo
  git remote add upstream "https://$GH_TOKEN@github.com/hughparsonage/drat.git"
  git fetch upstream 2>err.txt
  git checkout gh-pages

  Rscript -e "if (!requireNamespace('drat', quietly = TRUE)) install.packages('drat');drat::insertPackage('$PKG_REPO/$PKG_TARBALL', \
    repodir = '.', \
    addFiles = TRUE, \
    commit='Travis update $PKG_REPO: build $TRAVIS_BUILD_NUMBER')"
  git push 2>err.txt

}

addToDrat

## Other options:
## Only add if the commit is tagged: so something like:
#if [ $TRAVIS_TAG ] ; then
#   addToDrat
#fi
##but will need to edit .travis.yml since $TRAVIS_BRANCH will now equal $TRAVIS_TAG