#!/usr/bin/env bash

function _usage()
{
  local command="git sync"
  cat << EOS
Usage:
  ${command} <remote> <branch>
  ${command} -h | --help | help | ?

Sync local branch with <branch> of <remote>.
All changes and untracked files and directories will be removed.

Example:
  ${command} origin master
EOS
}

function main()
{
  while [ "$1" != "" ]; do
    case $1 in
      -h | --help | help | "?" )
        _usage
        ;;
      * )
        if [ "${remote}" = "" ]; then
          local remote="$1"
        elif [ "${branch}" = "" ]; then
          local branch="$1"
        else
          echo -e "Error: too many arguments.\n"
          _usage
          exit 1
        fi
        ;;
    esac
    shift
  done

  if [ "${remote}" = "" -o "${branch}" = "" ]; then
     echo -e "Error: too few arguments.\n"
     _usage
     exit 1
  fi

  echo "Are you sure you want to clean all changes & sync with '${remote}/${branch}'? [y/N]"
  local res
  read res
  case ${res} in
    "Y" | "y" | "yes" | "Yes" | "YES" )
      git fetch '${remote}' && git reset --hard '${remote}'/'${branch}' && git clean -d -f -x
      ;;
    * )
      echo "Canceled."
      ;;
  esac
}

main "$@"