#!/usr/bin/env bash
#
# mfnew
#
# Create a new branch from the default target with the given name
#

usage() {
  echo "Usage: `basename $0` [1|2] [name]" 1>&2
}

[[ $# < 3 ]] || { usage ; exit 1 ; }

MFINFO=$(mfinfo "$@") || exit 1
IFS=' ' read -a INFO <<< "$MFINFO"
TARG=${INFO[3]}
BRANCH=pr_for_$TARG-$(date +"%G-%m-%d_%H.%M.%S")

# BRANCH can be given as the last argument
case "$#" in
  1 ) case "$1" in
        1|2) ;;
        *) BRANCH=$1 ;;
      esac
      ;;
  2 ) case "$1" in
        1|2) BRANCH=$2 ;;
        *) usage ; exit 1 ;;
      esac
      ;;
esac

git fetch upstream
git checkout upstream/$TARG -b $BRANCH