Deploy hugo site to flynn

deploy.sh

#!/bin/bash
while getopts ":r:b:" opt; do
   case $opt in
      r) remote=$OPTARG ;;
      b) branch=$OPTARG ;;
      \?) echo "Invalid option: -$OPTARG" >&2 ;;
   esac
done

# set default remote
if [ -z $remote ]; then
   remote="flynn"
fi

# set default branch
if [ -z $branch ]; then
   branch="public_html"
fi

current_branch=$(git rev-parse --abbrev-ref HEAD)
# Create branch if it doesn't exist
git checkout -b "$branch" 2> /dev/null
if [ $? -eq 0 ]; then
   git commit -m --allow-empty "Initial commit"

   # switch back to previous branch
   git checkout "$current_branch" || exit 1
fi

# Generate site
hugo || exit 1

temp_dir=$(mktemp -d)

function cleanup {
  rm  -rf $temp_dir
  git worktree prune
}

# Remove temp_dir when finished
trap cleanup SIGINT SIGTERM EXIT

# Create a new worktree in temp dir
git worktree add "$temp_dir" "$branch" || exit 1

# Remove previous files
rm -rf "$temp_dir/*"

# Create Staticfile for buildpack
touch "$temp_dir/Staticfile"

# Copy generated files
cp -r public/* $temp_dir

git -C  "$temp_dir" add . || exit 1
git -C "$temp_dir" commit --allow-empty -m "Generated content - $(date +%Y-%m-%d:%H:%M:%S)" || exit 1

# Deploy to flynn
git -C "$temp_dir" push "$remote" "$branch:master" --force