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#!/bin/sh

if [ $# -eq 0 ]; then
  git -C "$(dirname "$0")/../packages" pull --ff-only >/dev/null 2>&1
#  curl -Ss 'https://packages.archlinux32.org/?uses_upstream=Does+Not+Use+Upstream&fuzzy&tsv' 
  curl -Ss 'http://packages.archlinux32.local/?uses_upstream=Does+Not+Use+Upstream&fuzzy&tsv' | \
    {
      read -r headers
      pkgbase_column=$(
        printf '%s\n' "${headers}" | \
          tr '\t' '\n' | \
          grep -nxF 'pkgbase' | \
          cut -d: -f1
      )
      cut -f${pkgbase_column}
    } | \
    sort -u | \
    parallel -j0 "$0"
  exit $?
elif [ $# -gt 1 ]; then
  >&2 echo 'I need zero or one argument.'
  exit 1
fi

pkgbase="$1"
unset pkgver
unset epoch

oldver=$(
  git -C "$(dirname "$0")/../packages" remote | \
    while read -r remote; do
      eval "$(
        git -C "$(dirname "$0")/../packages" archive "${remote}/master" -- 2>/dev/null | \
          tar -Ox --wildcards '*/'"${pkgbase}"'/PKGBUILD' 2>/dev/null | \
          sed -n '
            /^epoch=/p
            /^pkgver=/p
          '
      )"
      printf '%s %s\n' "${epoch-0}" "${pkgver}"
    done | \
    sort -k1n,1 -k2V,2 | \
    tail -n1 | \
    sed '
      s/^0\s\+//
      s/\s\+/:/
    '
)

case "${pkgbase}" in
  'linux-pae')
    url='https://www.kernel.org/pub/linux/kernel/v4.x/'
    regex='<a href="linux-\([0-9.]\+\)\.tar\.sign">'
  ;;
  'pcmciautils')
    url='https://kernel.org/pub/linux/utils/kernel/pcmcia/'
    regex='<a href="pcmciautils-\([0-9.]\+\)\.tar\.sign">'
  ;;
  'archlinux32-keyring'|'archlinux32-keyring-transition')
    url='https://sources.archlinux32.org/sources/'
    regex='<a href="archlinux32-keyring-v\([0-9.]\+\)\.tar\.gz">'
  ;;
  *)
    >&2 printf 'Checking the version of package "%s" is not yet implemented!\n' "${pkgbase}"
    exit 1
  ;;
esac

newver=$(
  curl -LSs "${url}" | \
    sed -n '
      s/^.*'"${regex}"'.*$/\1/
      T
      p
    ' | \
    sort -V | \
    tail -n1
)

if [ "${newver}" != "${oldver}" ]; then
  printf '%s: %s vs. %s\n' \
    "${pkgbase}" \
    "${newver}" \
    "${oldver}"
fi