#!/bin/bash

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

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

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|"
)"

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|"
)"

sha512sum="$(
  curl -o - "${dlUrl}" 2> /dev/null | \
    sha512sum - | \
    cut -d " " -f 1
)"

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

(
  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='${pkgdesc}'"
  echo "arch=('x86_64' 'i686')"
  echo "license=('PerlArtistic' 'GPL')"
  echo "options=('!emptydirs')"
  echo "depends=('perl')"
  echo "makedepends=()"
  echo "checkdepends=()"
  echo "url='${url}'"
  echo "_distdir=\"${cpanName}-\${pkgver}\""
  echo "source=(\"${dlUrlForPKGBUILD}\")"
  echo "sha512sums=('${sha512sum}')"
  echo ''
  echo 'build() {'
  echo '  ( export PERL_MM_USE_DEFAULT=1 PERL5LIB=""                 \'
  echo '      PERL_AUTOINSTALL=--skipdeps                            \'
  echo "      PERL_MM_OPT=\"INSTALLDIRS=vendor DESTDIR='\$pkgdir'\"     \\"
  echo "      PERL_MB_OPT=\"--installdirs vendor --destdir '\$pkgdir'\" \\"
  echo '      MODULEBUILDRC=/dev/null'
  echo ''
  echo '    cd "${srcdir}/${_distdir}"'
  echo '    perl Makefile.PL'
  echo '    make'
  echo '  )'
  echo '}'
  echo ''
  echo 'check() {'
  echo '  cd "${srcdir}/${_distdir}"'
  echo '  ( export PERL_MM_USE_DEFAULT=1 PERL5LIB=""'
  echo '    make test'
  echo '  )'
  echo '}'
  echo ''
  echo 'package() {'
  echo '  cd "${srcdir}/${_distdir}"'
  echo '  make install'
  echo ''
  echo '  find "${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"