if [ -n "$GITHUB_API_KEY" ]; then
cd "$TRAVIS_BUILD_DIR"
echo "cloning gh-pages"
git clone -q -b gh-pages https://thomaskrause:$GITHUB_API_KEY@github.com/korpling/graphANNIS gh-pages &>/dev/null
cd gh-pages
mkdir -p docs
cd docs
cp -R ${TRAVIS_BUILD_DIR}/docs/book/* .
git add .
git -c user.name='travis' -c user.email='travis' commit -m "update documentation"
echo "pushing to gh-pages"
git push -q https://thomaskrause:$GITHUB_API_KEY@github.com/korpling/graphANNIS gh-pages &>/dev/null
cd "$TRAVIS_BUILD_DIR"
fi