git-dwtb

#!/usr/bin/env bash

# git-dwtb: "done with this branch":
#  * check back out to master
#  * pull "${REMOTE}"/master
#  * delete the original branch
#  * prune "${REMOTE}"

set -eo pipefail

function __git_find_main_branch() {
  mapfile -t branches < <(git branch --format='%(refname:short)')
  for branch in "${branches[@]}"; do
    [[ "${branch}" == "main" || "${branch}" == "master" ]] \
      && echo -n "${branch}" \
      && return
  done
}

remote="${REMOTE:-origin}"
branchname=$(git rev-parse --abbrev-ref HEAD)
destination=$(__git_find_main_branch)

if [[ "${branchname}" == "${destination}" || "${branchname}" == "HEAD" ]]; then
  >&2 echo "Don't run me on ${destination} or a symbolic ref!"
  exit 1
fi

git checkout "${destination}" && \
  git pull "${remote}" "${destination}" && \
  git branch -D "${branchname}" && \
  git remote prune "${remote}"