unixorn/git-extra-commands

#!/usr/bin/env bash
#
# Find the default branch for a given git remote, or origin if unspecified
#
# Copyright 2020, Joe Block <jpb@unixorn.net>

set -o pipefail

usage() {
  myname=$(basename "$0")
  echo "Usage: $myname [GIT_REMOTE_NAME]"
}

if [[ $# -eq 0 ]]; then
  REMOTENAME='origin'
fi
if [[ $# -eq 1 ]];then
  REMOTENAME="$1"
fi
if [[ $# -gt 1 ]];then
  # shellcheck disable=SC2068
  usage $@
  exit 1
fi

git remote show "${REMOTENAME}" | awk '/HEAD branch/ {print $3}'
exit $?