#!/bin/bash

if [ $# -ne 1 ]
then
  >&2 echo "Verwendung: neuesPerlPaket cpan-Name"
  exit 1
fi

substituiere() {
  erg="$(
    cat "$(dirname "${me}")/perlSubstitutionen" | \
      sed 's|#.*$||' | \
      grep "\s$1\(\s\|\$\)" | \
      cut -d ':' -f 1
  )"
  [ -z "${erg}" ] && erg="$1"
  key="${erg}"
}

cpanName="$(echo "$1" | sed 's|::|-|g')"
url="https://metacpan.org/release/${cpanName}"
pkgname="perl-${cpanName,,}"

me="$(readlink -f "$0")"
cd "$(dirname "${me}")"

if [[ "$1" == "perl-"* ]]
then
  >&2 echo "${1} beginnt mit 'perl-', sollte es aber nicht"
  exit 1
fi

if [ -e "${pkgname}" ] || pacman -Ss "${pkgname}" > /dev/null
then
  >&2 echo "${cpanName} gibt es womöglich schon"
  exit 1
fi

seitenInhalt="$(curl -o - "${url}" 2> /dev/null)"

pkgver="$(
  echo "${seitenInhalt}" | \
    grep "<title>${cpanName}-" | \
    sed "s|^.*<title>${cpanName}-\([0-9.-]\+\)\s.*|\1|"
)"

pkgdesc="$(
  echo "${seitenInhalt}" | \
    grep "<title>${cpanName}-" | \
    sed "s|^.*<title>${cpanName}-[0-9.-]\+\s\+-\s\+\(\S.*\S\)\s\+-\s\+metacpan\.org</title>.*|\1|" | \
    sed "s|'|'\"'\"'|g"
)"

dlUrl="$(
  echo "${seitenInhalt}" | \
    grep "href=\"https://cpan.metacpan.org/authors/id/[^/]/[^/]\{2\}/[^/]\+/${cpanName}-[0-9.]\+\.tar\.gz\">" | \
    sed "s|^.*href=\"\(https://cpan.metacpan.org/authors/id/[^/]/[^/]\{2\}/[^/]\+/${cpanName}-[0-9.]\+\.tar\.gz\)\">.*\$|\1|" | \
    tail -n1
)"

dlUrlForPKGBUILD="$(
  echo "${dlUrl}" | \
    sed "s|/${cpanName}-[0-9.]\+\.tar\.gz|/\${_distdir}.tar.gz|"
)"

mkdir "${pkgname}"
cd "${pkgname}"

wget -nd "${dlUrl}"

sha512sum="$(
  sha512sum "${cpanName}-${pkgver}.tar.gz" | \
    cut -d " " -f 1
)"

oifs="${IFS}"
IFS=''
wasSammeln=''
unset makedepends
unset conflicts
unset depends
unset provides
while read s
do
  if [[ "${s}" == " "* ]]
  then
    key="$(
      echo "${s}" | \
        sed "s|^\s*\(\S\+\):\s\+'\?\([^']\+\)'\?\$|\1|" | \
        sed "s|::|-|g" | \
        tr "[[:upper:]]" "[[:lower:]]"
    )"
    substituiere "${key}"

    [ "${key}" == "%skip" ] && continue

    key="perl-${key}"
    value="$(
      echo "${s}" | \
        sed "s|^\s*\(\S\+:\)\s\+'\?\([^']\+\)'\?\$|\2|" | \
        sed "s|\s||g"
    )"
    if [ "${value}" == "0" ]
    then
      value=""
    else
      echo "${value}" | \
        grep -q "<=" ||
          value=">=${value}"
    fi
    case "${wasSammeln}" in
      "build_requires:"|"configure_requires:")
        makedepends="${makedepends} '${key}${value}'"
      ;;
      "conflicts:")
        conflicts="${conflicts} '${key}${value}'"
      ;;
      "provides:")
        echo "${s}" | \
          grep -q "^  \S" && \
            provides="${provides} '${key}'"
      ;;
      "recommends:"|"requires:")
        depends="${depends} '${key}${value}'"
      ;;
    esac
  else
    case "${s}" in
      "build_requires:"|"configure_requires:"|"conflicts:"|"recommends:"|"requires:"|"provides:")
        wasSammeln="${s}"
      ;;
      *)
        wasSammeln=''
      ;;
    esac
  fi
done < <(tar -Oxzf "${cpanName}-${pkgver}.tar.gz" "${cpanName}-${pkgver}/META.yml")
IFS="${oifs}"

makedepends="${makedepends# }"
conflicts="${conflicts# }"
depends="${depends# }"
[ -z "${depends}" ] && depends="'perl'"

(
  echo '# Maintainer: Erich Eckner <arch at eckner dot net>'
  echo '# Generator : neuesPerlPaket ('"$(sha512sum "${me}" | cut -d " " -f 1)"')'
  echo ''
  echo "pkgname='${pkgname}'"
  echo "pkgver='${pkgver}'"
  echo "pkgrel='1'"
  echo "pkgdesc='${pkgdesc}'"
  echo "arch=('x86_64' 'i686')"
  echo "license=('PerlArtistic' 'GPL')"
  echo "options=('!emptydirs')"
  echo "depends=(${depends})"
  [ -n "${makedepends}" ] && \
    echo "makedepends=(${makedepends})"
  [ -n "${conflicts}" ] && \
    echo "conflicts=(${conflicts})"
  echo "url='${url}'"
  echo "_distdir=\"${cpanName}-\${pkgver}\""
  echo "source=(\"${dlUrlForPKGBUILD}\")"
  echo "sha512sums=('${sha512sum}')"
  echo ''
  echo 'build(){'
  echo '  cd "${srcdir}/${_distdir}"'
  echo '  '
  echo "  # Setting these env variables overwrites any command-line-options we don't want..."
  echo '  export PERL_MM_USE_DEFAULT=1 PERL_AUTOINSTALL=--skipdeps \'
  echo "    PERL_MM_OPT=\"INSTALLDIRS=vendor DESTDIR='\${pkgdir}'\" \\"
  echo "    PERL_MB_OPT=\"--installdirs vendor --destdir '\${pkgdir}'\" \\"
  echo '    MODULEBUILDRC=/dev/null'
  echo ''
  echo '  # If using Makefile.PL'
  echo '  if [ -r Makefile.PL ]; then'
  echo '    perl Makefile.PL'
  echo '    make'
  echo '  # If using Build.PL'
  echo '  elif [ -r Build.PL ]; then'
  echo '    perl Build.PL'
  echo '    perl Build'
  echo '  fi'
  echo '}'
  echo ''
  echo 'check(){'
  echo '  cd "${srcdir}/${_distdir}"'
  echo ''
  echo '  # If using Makefile.PL'
  echo '  if [ -r Makefile.PL ]; then'
  echo '    make test'
  echo '  # If using Build.PL'
  echo '  elif [ -r Build.PL ]; then'
  echo '    perl Build test'
  echo '  fi'
  echo '}'
  echo ''
  echo 'package(){'
  echo '  cd "${srcdir}/${_distdir}"'
  echo '  '
  echo '  # If using Makefile.PL'
  echo '  if [ -r Makefile.PL ]; then'
  echo '    make install'
  echo '  # If using Build.PL'
  echo '  elif [ -r Build.PL ]; then'
  echo '    perl Build install'
  echo '  fi'
  echo ''
  echo '  # remove perllocal.pod and .packlist'
  echo '  find "${pkgdir}" -name .packlist -o -name perllocal.pod -delete'
  echo '}'
) > PKGBUILD

makepkg -fcrs || exit 1

echo ''
echo 'sieht soweit erst mal gut aus, oder?'
read antwort

if [ -n "${antwort}" ]
then
  echo 'ok, dann nicht ...'
  exit 1
fi

pacman -Qlp ${pkgname}-*.pkg.tar.xz

echo ''
echo 'auch hier alles in Ordnung, oder?'
read antwort

if [ -n "${antwort}" ]
then
  echo 'ok, dann nicht ...'
  exit 1
fi

git add PKGBUILD
git commit -m "${pkgname} neu"