git-push-as: pull request without creating branches.

git-push-as

#!/bin/bash -e

# Push local changes on the current branch as a new branch, then
# reset the local branch back to its remote tracking branch.
#
# This enables a fast workflow:
# 10 `git commit` one or more changes to main.
# 20 `git push-as -p new-feature`
# 30 goto 10

while getopts "p" opt; do
  case "$opt" in
  "p") PULL_REQUEST="pr";;
  esac
done
shift $(( OPTIND - 1 ))

main() {
  if ! git diff-index --quiet HEAD; then
    echo "Politely refusing to destroy uncommitted changes." >&2
    exit 1
  fi

  local branch_new="$1"
  if [ -z "$branch_new" ]; then
    echo "Usage: $0 <new-branch>" >&2
    exit 1
  fi

  local branch_base=$(git symbolic-ref --short HEAD)
  local remote=$(git remote | head -n1 || echo "origin")

  echo "Creating new local branch: $branch_new"
  git branch "$branch_new"

  echo "Resetting local $branch_base to $remote/$branch_base"
  git reset --hard "$remote/$branch_base"

  echo "Pushing $branch_new to $remote"
  git push --set-upstream "$remote" "$branch_new"

  if [ -n "$PULL_REQUEST" ]; then
    # `hub pull-request -h $branch_new` should work, but...
    git checkout "$branch_new"
    hub pull-request
    git checkout "$branch_base"
  fi
}

main "$@"