#!/bin/bash

BLUE="\e[34m"
YELLOW="\e[33m"
RED="\e[31m"
BOLD="\e[1m"
GREEN="\e[32m"
RESET="\e[0m"

if [ $# -ne 1 ]; then
  echo "please specify a patch file"
  exit 1
fi

if [ ! -f "${1}" ]; then
  echo "specified patch file does not exist"
  exit 1
fi

from="$(grep "From: " "${1}" | sed 's/From: //g')"
title="$(grep "Subject: \[PATCH\] " "${1}" | sed 's/Subject: \[PATCH\] //g')"

applied=0
code=0

echo
echo -e  "${BOLD}${GREEN}From ${RESET}${BOLD}:${RESET} ${from}"
echo -e  "${BOLD}${GREEN}Title${RESET}${BOLD}:${RESET} ${title}"
echo

while true; do
  echo -en "${BOLD}(${BLUE}E${RESET}${BOLD})dit "
  echo -en "${BOLD}(${BLUE}A${RESET}${BOLD})pply "
  [ $applied -eq 1 ] && echo -en "${BOLD}(${BLUE}U${RESET}${BOLD})ndo "
  echo -en "${BOLD}(${BLUE}S${RESET}${BOLD})kip "
  echo -en "${BOLD}(${BLUE}C${RESET}${BOLD})ancel "

  read -s -n1 answer
  echo -en "\r                                          \r"

  case "${answer,,}" in
    "e")
      $EDITOR "${1}"
      ;;

    "a")
      #git apply --reject --whitespace=fix "${1}" && break
      git am --reject --whitespace=fix "${1}" && break
      applied=1
      ;;

    "u")
      git am --abort
      ;;

    "s")
      break
      ;;

    "c")
      code=1
      break
      ;;

    *)
      if [ ! -z "${answer}" ]; then
        echo -e "${BOLD}Please enter a valid answer${RESET}"
      fi
      ;;
  esac
done

exit $code