git checkout PR into git worktree

git-worktree-pr.sh

#!/bin/bash

GIT_REPO_NAME=$(basename `git rev-parse --show-toplevel`)
PR_NUM=${1}
WORKTREES_DIR="${HOME}/worktrees"

mkdir -p ${WORKTREES_DIR}/${GIT_REPO_NAME}
# requires `git fetch-pr` alias credit: https://gist.github.com/gnarf/5406589
# fetch-pr  = "!f() { git fetch -fu ${2:-$(git remote |grep ^upstream || echo origin)} refs/pull/$1/head:pr/$1; }; f"
git fetch-pr ${PR_NUM}
git worktree add ${WORKTREES_DIR}/${GIT_REPO_NAME}/pr-${PR_NUM} pr/${PR_NUM}