git-checkout-pull-remote-prune-branch-d

#!/usr/bin/env bash
set -o errexit

: ${GIT:=git}

__mainremote() {
  if [[ "${REMOTE}" ]] ; then
    echo "${REMOTE}"
    return
  fi

  ${GIT} config --local repo.mainremote 2>/dev/null || echo origin
}

__mainbranch() {
  if [[  "${BRANCH}" ]] ; then
    echo "${BRANCH}"
    return
  fi

  ${GIT} config --local repo.mainbranch 2>/dev/null || echo master
}

__delbranch() {
  if [[ "${1}" ]] ; then
    echo "${1}"
    return
  fi

  ${GIT} rev-parse --abbrev-ref HEAD
}

main() {
  local delbranch="$(__delbranch "${1}")"

  ${GIT} checkout "$(__mainbranch)"
  ${GIT} pull
  ${GIT} remote prune "$(__mainremote)"
  if [[ $delbranch ]] ; then
    ${GIT} branch -d "${delbranch}"
  fi
}

main "$@"