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#!/usr/bin/env bash
set -e

# Source variables from makepkg
source /etc/makepkg.conf
source $XDG_CONFIG_HOME/.makepkg.conf &>/dev/null || true

# Source variables from libretools
source /etc/libretools.conf
source $XDG_CONFIG_HOME/libretools/libretools.conf &>/dev/null || true

# End inmediately but print an useful message
trap_exit() {
  term_title "error!"
  error "($(basename $0)) $@ (leftovers on ${temp_dir})"
  exit 1
}

# Trap signals from makepkg
trap 'trap_exit "TERM signal caught. Exiting..."' TERM HUP QUIT
trap 'trap_exit "Aborted by user! Exiting..."' INT
trap 'trap_exit "An unknown error has occurred. Exiting..."' ERR

# Source this PKGBUILD, if it doesn't exist, exit
if ! source PKGBUILD &>/dev/null ; then
 error "No PKGBUILD in %s" "$PWD"
 exit 1
fi

# This is the name of the package
name="${pkgbase:-${pkgname[0]}}"

# The name of the previous package
prev="${3}"
depth="${2:-0}"
let next=${depth}+1 || true

# A temporary work dir and log file
temp_dir="${1:-$(mktemp -d /tmp/${name}-testpkg-XXXX)}"
log="${temp_dir}/buildorder"

# Generate the full version with epoch
get_fullver() {
    if [ $1 -eq 0 ]; then
# zero epoch case, don't include it in version
        echo $2-$3
    else
        echo $1:$2-$3
    fi

}

# If it's already built we don't bother
is_built ${pkgname[0]} $(get_fullver ${epoch:-0} ${pkgver} ${pkgrel}) &&
exit

# If the envvar I contains this package, ignore it and exit
echo "$I" | grep -q "$name" && exit

msg "%s(%d)" $name $depth

build=false
if [ ! -z "${1}" -a ${depth} -eq 0 ]; then
  build=true
fi

  # If we specified a work dir on the cli it means we want to skip
  # dependency graph creation and jump to build whatever is there
  if ! ${build}; then

  # Export a pair of current and previous package to get a list of graph
  # edges
  echo -e "${name}\t${prev:--}" | tee -a ${log}

  # Recurse into dependencies
  for d in ${depends[@]} ${makedepends[@]}; do
    # Cleanup dependency versions
    d=$(echo $d | sed "s/[<>=].*//")
    # Where's the pkgbuild?
    w=$(toru-where $d)

    # Skip if not available
    test -z "$w" && continue

    # Go to this dir
    pushd $w &>/dev/null

    # Infinite loop detection, if the inverted pair current+prev was
    # already seen, skip
    if grep -q "${prev}[[:space:]]${d}" ${log} ; then
      msg2 "infinite loop %s<->%s" $d $prev
      continue
    fi

    # Edge detection
    if grep -q "^${d}[[:space:]]" ${log} ; then
      msg2 "edge %s already visited" ${d}
      continue
    fi

    # Run this same command giving work dir, depth and previous package
    $0 ${temp_dir} ${next} ${name}

    popd &>/dev/null
  done
else
  msg "Resuming build..."
fi

# end here if we're not the first package
test ${depth} -ne 0 && exit


# enter work dir
pushd "${temp_dir}" &>/dev/null
tsort ${log} | head -n-1 | tac | nl | tac | while read order pkg; do
  # skip if already built
  test -f "${pkg}/built_ok" && continue

  # where's this package?
  w="$(toru-where "$pkg")"
  test -z "$w" && continue

  # copy to work dir if not already
  test -d "$pkg" || cp -r "$w" "$pkg"
  pushd "$pkg" &>/dev/null

  term_title "$pkg($order)"

  msg "Building %s" ${pkg}

  # upgrade the system
  sudo -E pacman -Syu --noconfirm

  # run the pre build command from libretools.conf
  ${HOOKPREBUILD}

  # run the build command
  ${FULLBUILDCMD}

  # Run local release hook with $1 = $repo
  ${HOOKLOCALRELEASE} "$(basename "$(dirname "$w")")"

  # it's built!
  touch built_ok

  popd &>/dev/null
done

popd &>/dev/null
# cleanup
rm -rf ${log} "${temp_dir}"

term_title "done"