A git subcommand to "tophat" (build/run/test) a PR from a fork

git-tophat

#!/bin/zsh

function main {
  if [[ ! "$1" =~ ".*:.*" ]]; then
    echo "Empty username or branch name: \`$1\` should be of the form \`user:branch\`"
    exit 1
  fi

  local username="${1%:*}"
  local branch="${1#*:}"
  local tophat_url="$(git remote get-url origin | rg -o '(.*[/:])\w+/(\w+).git' -r "\${1}${username}/\${2}")"

  git remote rm tophat &>/dev/null
  git remote add -f -t "${branch}" tophat "${tophat_url}" \
    && git checkout "tophat/${branch}"
}

main "$@"