#!/usr/bin/env bash
# initialize a new worktree from a PR number:
#
# - creates a new remote using the fork's clone URL
# - creates a local branch tracking the remote branch
# - creates a new worktree in a parent folder, suffixed with "-pr-$PR"
#
# sample usage:
# ./scripts/pr2wt.sh 12345
# ./scripts/pr2wt.sh 12345 opencode
# ./scripts/pr2wt.sh 12345 "cmake -B build && cmake --build build"
# ./scripts/pr2wt.sh 12345 "bash -l"
function usage() {
echo "usage: $0 <pr_number> [cmd]"
exit 1
}
# check we are in the right directory
if [[ ! -f "scripts/pr2wt.sh" ]]; then
echo "error: this script must be run from the root of the repository"
exit 1
fi
if [[ $# -lt 1 || $# -gt 2 ]]; then
usage
fi
PR=$1
[[ "$PR" =~ ^[0-9]+$ ]] || { echo "error: PR number must be numeric"; exit 1; }
url_origin=$(git config --get remote.upstream.url 2>/dev/null) || \
url_origin=$(git config --get remote.origin.url) || {
echo "error: no remote named 'upstream' or 'origin' in this repository"
exit 1
}
# Extract org/repo from either https or ssh format.
if [[ $url_origin =~ ^git@ ]]; then
org_repo=$(echo $url_origin | cut -d: -f2)
else
org_repo=$(echo $url_origin | cut -d/ -f4-)
fi
org_repo=${org_repo%.git}
echo "org/repo: $org_repo"
meta=$(curl -sSLf -H "Accept: application/vnd.github+json" "https://api.github.com/repos/$org_repo/pulls/$PR")
url_remote=$(echo "$meta" | jq -r '.head.repo.clone_url')
head_ref=$(echo "$meta" | jq -r '.head.ref')
echo "url: $url_remote"
echo "head_ref: $head_ref"
url_remote_cur=$(git config --get "remote.pr/$PR.url" 2>/dev/null || true)
if [[ "$url_remote_cur" != "$url_remote" ]]; then
git remote rm pr/$PR 2> /dev/null
git remote add pr/$PR "$url_remote"
fi
git fetch "pr/$PR" "$head_ref"
dir=$(basename $(pwd))
git branch -D pr/$PR 2> /dev/null
git worktree add -b pr/$PR ../$dir-pr-$PR pr/$PR/$head_ref 2> /dev/null
og_path=$(pwd)
wt_path=$(cd ../$dir-pr-$PR && pwd)
echo "git worktree created in $wt_path"
cd $wt_path
# pi agent setup in the worktree
if [[ -f "$og_path/.pi/SYSTEM.md" && ! -f ".pi/SYSTEM.md" ]]; then
mkdir -p .pi
ln -sfn "$og_path/.pi/SYSTEM.md" .pi/SYSTEM.md
fi
git branch --set-upstream-to=pr/$PR/$head_ref
git pull --ff-only || {
echo "error: failed to pull pr/$PR"
exit 1
}
if [[ $# -eq 2 ]]; then
echo "executing: $2"
eval "$2"
fi