#!/bin/bash

usage() {
  >&2 echo 'Verwendung: '
  >&2 echo "  $0"' [-f|--force] [-j|--jobs=${jobs}]'
  >&2 echo '    -f|--force|--noUpdate:  prüfe Versionen unhabhängig von Zeit der letzten Prüfung'
  >&2 echo '    -j|--jobs:              Anzahl parallel auszufuehrender Anfragen'
  >&2 echo '    -m:                     maschinenlesbare Ausgabe erzeugen'
  exit 1
}

curl_it() {
  local source="$1"
  shift
  curl --connect-timeout 5 -s "$@" "${source}"
}

me="$(readlink -f $0)"
cd $(dirname "${me}")
versionenDatei="/var/cache/$(basename "$(dirname "${me}")").lastVersions"
jobs=0
maschinenlesbar=false
[ ! -r "${versionenDatei}" ] && force=true || force=false
unForce=false

eval set -- "$(getopt -o fj:m --long force,jobs:,noUpdate -n "$(basename "$0")" -- "$@" || echo "usage")"
args=("$@")
optArgs=()

while true
do
  case $1 in
    -f|--force)
      force=true
      optArgs[${#optArgs[@]}]="-f"
    ;;
    --noUpdate)
      unForce=true
      optArgs[${#optArgs[@]}]="--noUpdate"
    ;;
    -j|--jobs)
      shift
      jobs="$1"
      optArgs[${#optArgs[@]}]="-j"
      optArgs[${#optArgs[@]}]="$1"
    ;;
    -m)
      optArgs[${#optArgs[@]}]="-m"
      maschinenlesbar=true
    ;;
    --)
      shift
      break
    ;;
    *)
      >&2 echo "FEHLER: Verstehe Option \"$1\" doch nicht! Ich beende."
      rm -rf "${tmpDir}"
      usage
  esac
  shift
done

versionenErmitteln=${force}
! ${versionenErmitteln} && [ $(head -n1 "${versionenDatei}") -le $[$(date "+%s")-300] ] && versionenErmitteln=true
${maschinenlesbar} && versionenErmitteln=true
${unForce} && versionenErmitteln=false
versionenSchreiben=${versionenErmitteln}
[ ! -w "${versionenDatei}" ] && versionenSchreiben=false
${maschinenlesbar} && versionenSchreiben=false

if [ $# -eq 0 ]
then
  if ${versionenSchreiben}
  then
    tmpFile="$(mktemp /tmp/versionen.XXXXXX)"
    date "+%s" > "${tmpFile}"
    set -o pipefail
    ${me} "${args[@]}" $(echo */PKGBUILD | tr " " "\n" | sed "s|/PKGBUILD||") | tee -a "${tmpFile}"
    err=$?
    set +o pipefail
    cat "${tmpFile}" > "${versionenDatei}"
    rm "${tmpFile}"
  elif ! ${versionenErmitteln}
  then
    cat "${versionenDatei}" | \
      ( \
        read dummy
        cat
      )
    err=$?
  else
    ${me} "${args[@]}" $(echo */PKGBUILD | tr " " "\n" | sed "s|/PKGBUILD||")
    err=$?
  fi
  exit ${err}
elif [ $# -eq 1 ] && ${versionenErmitteln}
then
  . $1/PKGBUILD

  srcKnown=false

  for src in "${source[@]}" "${source_i686[@]}" "${source_x86_64[@]}"
  do

    src="${src#*::}"

    if [ "${pkgname}" == "adduser" ]
    then
      remVer="$(
        curl_it "${source[0]}" '-L' | \
          grep '^# Version: ' | \
          sed 's|^# Version: \+||'
      )"
    elif [ "${pkgname}" == "dropbox" ]
    then
      remVer="$(
        curl_it 'https://www.dropboxforum.com/t5/Desktop-client-builds/bd-p/101003016' | \
          tr '<>' '\n' | \
          grep '^Stable Build [0-9.-]\+$' | \
          sed 's|^Stable Build \([0-9.-]\+\)$|\1|' | \
          sort -V | \
          tail -n1
      )"
    elif [ "${pkgname}" == "g95" ]
    then
      remVer='0.94'
    elif [ "${pkgname}" == "pgplot-for-ifeffit" ]
    then
      remVer="$(
        curl_it "ftp://ftp.astro.caltech.edu/pub/pgplot/" | \
          grep "\spgplot[0-9.]\+\.tar\.gz -> \S\+\$" | \
          sed "s|^.*\spgplot\([0-9.]\+\)\.tar\.gz -> \S\+\$|\1|" | \
          sort -V | \
          tail -n1
      )"
    elif [ "${pkgname}" == "wurzel-old" ]
    then
      remVer="0.1"
    elif echo "${src}" | \
      grep -q '^http://ftp.linux.org.uk/.*/netkit/'
    then
      quVer="${src%/*}/"
      remVer="$(
        curl_it "${quVer}" | \
          tr '<>' '\n' | \
          grep "^${pkgname#netkit-}-[0-9.-]\+\.tar\.gz\$" | \
          sed "s|^${pkgname#netkit-}-\([0-9.-]\+\)\.tar\.gz\$|\1|" | \
          sort -V | \
          tail -n1
      )"
    elif [ "${pkgname}" == "archiso32" ] || [ "${pkgname}" == 'archiso-dual' ]
    then
      git -C /usr/src/archlinux/archiso fetch upstream
      remVer="$(
        git -C /usr/src/archlinux/archiso archive --format=tar upstream/master | \
          tar -Ox Makefile | \
          grep -m1 '^V=[0-9]\+$' | \
          cut -d= -f2
      )"
    elif echo "${src}" | \
      grep -q '//download\.virtualbox\.org/'
    then
      quVer="$(
        echo "${src}" | \
          sed 's|/[^/]\+/[^/]\+$||'
      )"
      remVer="$(
        curl_it "${quVer}/LATEST.TXT"
      )"
    elif echo "${src}" | \
      grep -q "//www\.mpich\.org/"
    then
      quVer="${src%/*/*}/"
      aVers="$(
        curl_it "${quVer}" | \
          tr '"' '\n' | \
          grep '^[0-9.]\+/$' | \
          sed 's|/$||'
      )"
      if [ ! "${pkgname}" == "mpich" ]
      then
        aVers="$(
          (
            echo "${aVers}"
            echo "${pkgname#mpich} %%%SCHNIPP%%%"
          ) |
            sort -V | \
            sed '/%%%SCHNIPP%%%/q' | \
            grep -v '%%%SCHNIPP%%%'
        )"
      fi
      remVer="$(
        echo "${aVers}" | \
          sort -V | \
          tail -n1
      )"
    elif echo "${src}" | \
      grep -q 'git://anonscm\.debian\.org/'
    then
      remVer="$(
        git ls-remote --tags "${src%#*}" | \
          awk '{print $2}' | \
          grep '^refs/tags/v[0-9.]\+$' | \
          sed 's|^refs/tags/v\([0-9.]\+\)$|\1|' | \
          sort -V | \
          tail -n1
      )"
    elif echo "${src}" | \
      grep -q "^https://pypi\.python\.org/packages/"
    then
      qu="$(
        echo "${src}" | \
          sed 's|^\(.*\)/packages/.*/\([^/]\+\)-[^/-]\+\.tar\.gz$|\1/pypi/\2/|'
      )"
      remVer="$(
        curl_it "${qu}" | \
          tr "\"" "\n" | \
          grep "^/pypi/\(python-\)\?${pkgname#*-}/[0-9.-]\+\$" | \
          sed "s|^/pypi/\(python-\)\?${pkgname#*-}/\([0-9.-]\+\)\$|\2|" | \
          sort -V | \
          tail -n1
      )"
      remHash="$(
        curl_it "${qu}${remVer}" | \
          tr '"#' '\n' | \
          grep -m1 "^https://pypi\.python\.org/packages/.*/[0-9a-f]\{60\}/${pkgname#*-}-${remVer}\.tar\.\(gz\|bz2\|xz\)\$" | \
          sed 's|/[^/]\+$|/|; s|^https://pypi\.python\.org/packages/|/|'
      )"
      locHash="$(
        echo "${src}" | \
          sed 's|/[^/]\+$|/|; s|^https://pypi\.python\.org/packages/|/|'
      )"
      ${maschinenlesbar} && \
        [ "${remHash}" != "${locHash}" ] && \
        echo "sedExtra='s@${locHash}@${remHash}@g;'"
    elif echo "${src}" | \
      grep -q "//bundles\.openttdcoop\.org/"
    then
      qu="$(
        echo "${src}" | \
          sed 's|^\(https\?://\([^/]\+/\)\{3\}\).*$|\1|'
      )"
      remVer="$(
        curl_it "${qu}" | \
          tr "\"" "\n" | \
          grep '^[0-9.]\+/$' | \
          sed 's|/$||' | \
          sort -V | \
          tail -n1
      )"
    elif echo "${src}" | \
      grep -q "//opensources\.eckner\.net/"
    then
      qu=${src#*::}
      qu=${qu%-*}
      quNam=${qu#*=}
      remVer=$( \
        curl_it "$(\
          echo "${qu}" | \
            sed "s|\?dl=|?ls=|" \
          )" | \
          tr "<>" "\n\n" | \
          grep "^${quNam}-" | \
          sed "s|^${quNam}-||" | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q "//\(search\.m\?\)\?cpan\.org/\|//cpan\.metacpan\.org/authors/\|cpan\.org/modules/by-module/"
    then
      quVer=$( \
        echo "${src%/*}/" | \
          sed 's|//\(search\.m\?\)\?cpan\.org/|//www.cpan.org/|' | \
          sed 's|/CPAN/|/|'
      )
      quNam=${src##*/}
      quNam=${quNam%-*}
      quEnd=$( \
        echo "${src##*-}" | \
          sed "s|^v\?[0-9.]*||" | \
          sed 's|\.|\\\.|'
      )
      if [ "${pkgname}" == 'perl-chi' ]
      then
        pre='s|\(\...\)$|\10|'
        post='s|\(\...\)0$|\1|'
      elif [ "${pkgname}" == 'perl-opengl' ]
      then
        pre='s|\(\...\)\(..\)$|\1.\2|'
        post='s|\(\...\)\.\(..\)$|\1\2|'
      else
        pre=''
        post=''
      fi
      remVer=$( \
        curl_it "${quVer}" | \
          tr "\"" "\n" | \
          grep "^${quNam}-v\?[0-9.-]*\.${quEnd}\$" | \
          sed "s|^${quNam}-v\?\([0-9.-]*\)\.${quEnd}\$|\1|" | \
          sed "${pre}" | \
          sort -V | \
          tail -n1 | \
          sed "${post}"
      )
    elif echo "${src}" | \
      grep -q "ftp://"
    then
      quVer="${src%/*}/"
      quNam=${src##*/}
      quEnd=$( \
        echo "${quNam}" |
          sed "s|^.*v\?[0-9.]*[0-9]||" \
      )
      quNam=$( \
        echo ${quNam} | \
          sed "s|v\?[0-9.]\+.*\$||" \
      )
      tmpVer=$( \
        curl_it "${quVer}" | \
          awk '{print $9}' | \
          grep "^${quNam}v\?[0-9.]*${quEnd}\$" | \
          sed "s|^${quNam}v\?\([0-9.]*\)${quEnd}\$|\1|" | \
          sort -V | \
          tail -n1 \
      )
      [ "${pkgname}" == "pgplot" ] && remVer="${tmpVer:0:1}.${tmpVer:1:1}.${tmpVer:2}" || remVer="${tmpVer}"
    elif echo "${src}" | \
      grep -q '//arch\.eckner\.net/\|//mirror\.archlinux32\.org/'
    then
      quVer="${src%/*}"
      quVer="${quVer#*::}"
      quNam=${src##*/}
      quNam=${quNam%-*}
      quNam=${quNam%-*}
      quNam=${quNam%-*}
      quEnd=${src##*-}
      quEnd=${quEnd#*.}
      remVer=$( \
        curl_it "${quVer}/" | \
          tr "\"" "\n" | \
          grep "^${quNam}\(-[^-]*\)\{3\}\.${quEnd}\$" | \
          sed "s|^${quNam}-\([^-]*\)\(-[^-]*\)\{2\}\.${quEnd}\$|\1|" | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q "//github.com/"
    then
      quVer=$(
        echo "${src#*::}" | \
          sed "s|/archive/[^/]*\$|/releases|" | \
          sed 's|http:|https:|'
      )
      quNam=/${quVer#*.com/}/tag/
      remVer=$( \
        curl_it "${quVer}" | \
          tr "\"" "\n" | \
          tr '[[:upper:]]' '[[:lower:]]' | \
          grep "^${quNam}v\?[0-9.]\+\$" | \
          sed "s|^${quNam}v\?||" | \
          (
            if [ "${pkgname}" == "conky" ]
            then
              grep -v '\.999$'
            else
              cat
            fi
          ) | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q "//\(\(pr\)\?downloads\.\)\?sourceforge\.net/"
    then
      quVer=$( \
        echo "${src}" | \
          sed 's|/sourceforge/|/|' | \
          sed 's|\(//sourceforge\.net/.*/\)[^/]*/[^/]*$|\1|' | \
          sed "s|//\(pr\)\?downloads\.sourceforge\.net/\([^/]*\)/[^/]*\$|//sourceforge.net/projects/\2/files/\2/|" | \
          sed 's|/scidavis/$|/SciDAVis/|' | \
          sed 's|^http:|https:|'
      )
      remVer=$( \
        curl_it "${quVer}" | \
          tr "\"" "\n" | \
          grep "^${quVer#*sourceforge.net}\(${pkgname}\(-\|%20\)\)\?[0-9.-]" | \
          sed "s@/${pkgname}\(-\|%20\)@/@" | \
          sed 's|\.tar.*$||' | \
          sed "s|^${quVer#*sourceforge.net}\([0-9.-]\+\).*\$|\1|" | \
          sed "s|-\$||" | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q '//support\.hdfgroup\.org/'
    then
      quVer="${src%/*/*/*}/"
      quNam="${src#${quVer}}"
      quNam="${quNam%%.*}"
      quNam="$(echo "${quNam}" | tr '[:lower:]' '[:upper:]')"
      remVer=$( \
        curl_it "${quVer}" | \
          tr '"' '\n' | \
          grep "^${quNam}\.[.0-9]\+/\$" | \
          sed "s|^${quNam}\.\(.*\)/\$|\1|" | \
          sort -V | \
          tail -n1 \
      )
    elif echo "${src}" | \
      grep -q "svn://svn\.openttd\.org"
    then
      remVer=$( \
        svn log "${src%#*}" | \
          grep -v "^-.* WebTranslator " | \
          grep -v "^-.* Eints:" | \
          grep -B10 -m1 -- "^-[^-]" | \
          grep "^r" | \
          tail -n1 | \
          sed "s|^r\([[:digit:]]\+\)\s.*\$|\1|" \
        )
    elif echo "${src}" | \
      grep -q 'https://bitbucket\.org/.*/get/[^/]\+$'
    then
      srcPreNam="$(
        echo "${src}" | \
          sed 's|^.*/\([^/0-9]\+_\)[0-9][^/]\+$|\1|'
      )"
      srcEndg="$(
        echo "${src}" | \
          sed 's|^.*\(\.tar[^/]*\)$|\1|' | \
          sed 's|\.|\\.|g'
      )"
      remVer="$(
        curl_it "${src%/get/*}/downloads/?tab=tags" | \
          tr '"' '\n' | \
          grep "${srcEndg}\$" | \
          sed "s|^.*/${srcPreNam}\(.*\)${srcEndg}\$|\1|" | \
          tr '_' '.' | \
          sort -V | \
          tail -n1
      )"
    elif echo "${src}" | \
      grep -q "$(
        printf '^https\\?://%s/\|' \
          'alpine\.freeiz\.com' \
          'bitbucket\.org' \
          'bindfs\.org' \
          'download\.osgeo\.org' \
          'ftp\.daper\.net' \
          'isl\.gforge\.inria\.fr' \
          'qgis\.org' \
          'webhome\.phy\.duke\.edu' \
          'www\.iozone\.org' \
          'www\.wurzel\.org' \
          'www\.cybernoia\.de' \
          | sed 's@\\|$@\n@'
      )"
    then
      quVer="${src%/*}/"
      remVer="$( \
        curl_it "${quVer}" | \
          tr '"<>' '\n\n\n' | \
          grep "^${pkgname}\(-src\)\?-\?[0-9._]\+\.t\(ar\(\.[gx]z\|\.bz2\)\?\|gz\)\$" | \
          sed "s@^${pkgname}\(-src\)\?-\?\([0-9._]\+\)\.t\(ar\(\.[gx]z\|\.bz2\)\?\|gz\)\$@\2@" | \
          tr '_' '.' | \
          sort -V | \
          tail -n1
      )"
    elif echo "${src}" | \
      grep -q '^https\?://\(www\.\)\?paraview\.org/files/'
    then
      remVerz="$(
        echo "${src}" | \
          sed 's|/v[0-9.]\+/ParaView-v[0-9.]\+\.tar\.gz$|/|' | \
          sed 's|^\(http://\)|\1www.|'
      )"
      for mainVer in $(
          curl_it "${remVerz}" | \
            tr ' >' '\n' | \
            grep '^href="v[0-9.]\+/"$' | \
            sed 's|href="v\([0-9.]\+\)/"$|\1|' | \
            sort -Vr
        )
      do
        remVer="$(
          curl_it "${remVerz}v${mainVer}/" | \
            tr ' >' '\n' | \
            grep '^href="ParaView-v[0-9.]\+\.tar\.gz"$' | \
            sed 's|^href="ParaView-v\([0-9.]\+\)\.tar\.gz"$|\1|' | \
            sort -V | \
            tail -n1
        )"
        [ -n "${remVer}" ] && break
      done
    elif echo "${src}" | \
      grep -q '^http://download\.linuxaudio\.org/lilypond/sources/'
    then
      remVerz="$(
        echo "${src}" | \
          sed 's|[^/]\+/[^/]\+$||'
      )"
      for mainVer in $(
          curl_it "${remVerz}" | \
            tr '"' '\n' | \
            grep '^v[0-9.]\+/$' | \
            sed 's|^v\([0-9.]\+\)/$|\1|' | \
            sort -Vr
        )
      do
        remVer="$(
          curl_it "${remVerz}v${mainVer}/" | \
            tr '"' '\n' | \
            grep '^lilypond-[0-9.]\+\.tar\.\(gz\|bz2\|xz\)$' | \
            sed 's@^lilypond-\([0-9.]\+\)\.tar\.\(gz\|bz2\|xz\)$@\1@' | \
            sort -V | \
            tail -n1
        )"
        [ -n "${remVer}" ] && break
      done
    elif echo "${src}" | \
      grep -q "http://www\.mkgmap\.org\.uk/download"
    then
      remUrl="$(
        echo "${src}" | \
          sed 's|-r[0-9]\+\.zip$|.html|'
      )"
      remVer="r$(
        curl_it "${remUrl}" | \
          grep '"text: current()\.version"' | \
          tr '<>' '\n' |
          grep '^[0-9]\+$' | \
          sort -n | \
          tail -n1
      )"
    else
      continue
    fi
    srcKnown=true
    break
  done

  if ! ${srcKnown}
  then
    echo "$1: Unknown src: '${source[@]}' '${source_i686[@]}' '${source_x86_64[@]}'"
    exit 1
  fi

  if ${maschinenlesbar}
  then
    echo "remVer='${remVer}'"
    echo "pkgver='${pkgver}'"
    echo "pkgrel='${pkgrel}'"
  else
    if [ ! "${pkgver}" == "${remVer}" ]
    then
      echo "$1: ${pkgname}: ${remVer} vs. ${pkgver}" | \
        sed "s|^\([^:]\+\): \1:|\1:|"
    fi
  fi

elif ${versionenErmitteln}
then
  echo "$@" | \
    tr " " "\n" | \
    parallel -j${jobs} "${me}" "${optArgs[@]}" {} \;
  exit $?

else
  for s in "$@"
  do
    grep "^${s}:" "${versionenDatei}"
  done
fi