#! /bin/bash

m4file=""
fontsize=10

usage() {
  echo "Usage:"
  echo "${0##*/} --help"
  echo "${0##*/} [options] path/to/file.m4"
  echo
  echo "--help"
  echo "  Show this help message."
  echo
  echo "-f, --fontsize"
  echo "  Set size of base font, in points."
  echo "  Supported font sizes are 8, 9, 10, 11, 12, 14, 17 and 20."
  exit
}

if [[ "$#" == 0 ]]; then usage; fi

while [[ "$#" != 0 ]]; do
  case "${1}" in
    -h|--help)
      usage;;
    -f|--fontsize)
      case "${2}" in
        8)
          fontsize=8;;
        9)
          fontsize=9;;
        10)
          fontsize=10;;
        11)
          fontsize=11;;
        12)
          fontsize=12;;
        14)
          fontsize=14;;
        17)
          fontsize=17;;
        20)
          fontsize=20;;
        *)
          echo "Unsupported font size: ${2}"
          exit;;
      esac
      shift; shift;;
    *.m4)
      m4file="${1}"
      shift;;
    *)
      echo "Unknown option: ${1}"
      exit
  esac
done

if [[ "${m4file}" == "" ]]; then
  echo "No m4 input file"
  exit
fi

tempdir=$(mktemp -d)
cp -f "${m4file}" "${tempdir}/source.m4"
pushd "${tempdir}" > /dev/null

m4 -I /usr/share/circuit_macros pgf.m4 source.m4 | dpic -g > source.tex
pdflatex "\documentclass[preview=true]{standalone}\usepackage{tikz,boxdims}\usepackage[${fontsize}pt]{extsizes}\begin{document}\input source.tex\end{document}"

popd > /dev/null
cp "${tempdir}/standalone.pdf" "${m4file%.m4}.pdf"
rm -rf "${tempdir}"