squashpr

#!/bin/bash

set -e

[[ $# == 1 ]] || {
  echo "usage: $0 <pr-number>"
  exit 1
}

pr=$1

upstream=$(git remote -v | grep -E '^upstream\s+' | head -1 | sed 's/upstream.*github.com.\(.*\)\.git.*/\1/')

git fetch upstream pull/$pr/head -f
git checkout pr$pr 2> /dev/null || git checkout -b pr$pr
git reset --hard FETCH_HEAD

prInfo=$(curl -s https://api.github.com/repos/$upstream/pulls/$pr)
remoteName=$(echo -E $prInfo | jq -r '.head.user.login')

git remote -v | grep -E "^$remoteName\s+" > /dev/null || {
  remoteUrl=$(echo -E $prInfo | jq -r '.head.repo.ssh_url')
  echo "Adding remote $remoteName - $remoteUrl"
  git remote add $remoteName $remoteUrl
}

branch=$(echo -E $prInfo | jq -r '.head.ref')
git fetch -f $remoteName $branch

base=$(echo -E $prInfo | jq -r '.base.sha')

git rebase -i $base

git push -f $remoteName HEAD:$branch