#!/usr/bin/env bash
########################################################################
#   Convert PKGBUILD of Arch Linux to Pkgfile of CRUX
#   Usage: ./PKGBUILD2Pkgfile
#
#   Author: Colin Zheng <TO, that is Tee Oh, @jcolinzheng.org>
########################################################################


########################################################################
#   Change this line if necessary
MAINTAINER='your name <email>'
########################################################################


########################################################################
#   Constants
PKGBUILD=PKGBUILD
CPkgfile=Pkgfile
CMD5file=.md5sum
Cpre_install="pre-install"
Cpost_install="post-install"
Cpre_remove="pre-remove"
Cpost_remove="post-remove"

tags=('pkgname' 'pkgver' 'pkgrel' 'source' \
      '$startdir/pkg' '${startdir}/pkg' \
      '$startdir/src' '${startdir}/src')
Ctags=('name' 'version' 'release' 'source' '$PKG' '$PKG' '' '')
APP=`basename "$0"`
########################################################################

set -o errexit
msg_unimplemented() { echo "$APP: WARNING: $1 unsupported in Pkgfile"; }
msg_file_written() { echo "$APP: wrote $1"; }


tmpfile=`mktemp`
trap "rm -f $tmpfile; echo \"$APP: ERROR\"; exit" INT TERM EXIT

cp "$PKGBUILD" $tmpfile
for ((i=0; i<${#tags[@]}; ++i)); do
    sed -ie "s|${tags[$i]}|${Ctags[$i]}|g" $tmpfile
done
. $tmpfile; rm $tmpfile


[ "$makedepends" ] && msg_unimplemented 'option makedepends'

cat > "$CPkgfile" <<EOF
# Description: $pkgdesc
# URL: $url
# Maintainer: $MAINTAINER
# Depends on: ${depends[@]:0} ${makedepends[@]:0}

name=$name
version=$version
release=$release
source=(${source[@]:0})
EOF

declare -f build >> "$CPkgfile"
msg_file_written "$CPkgfile"


#   Get install scripts

if [ "$install" ]; then
    . "$install" 
    [ "$pre_install"  ] && (
        declare -f pre_install > "$Cpre_install"
        msg_file_written $Cpre_install )
    [ "$post_install" ] && (
        declare -f post_install > "$Cpost_install"
        msg_file_written $Cpost_install )
    [ "$pre_remove"   ] && (
        declare -f d pre_remove > "$Cpre_remove"
        msg_file_written $Cpre_remove )
    [ "$post_remove"  ] && (
        declare -f post_remove > "$Cpost_remove"
        msg_file_written $Cpost_remove )
    [ "$pre_upgrade"  ] && msg_unimplemented 'pre_upgrade script'
    [ "$post_upgrade" ] && msg_unimplemented 'post_upgrade script'
fi


#   Get MD5 sums

if [ "$md5sums" ]; then
    true > "$CMD5file"
    for ((i=0; i<${#source[@]}; ++i)); do
        echo ${md5sums[$i]} ${source[$i]} >> "$CMD5file"
    done
    msg_file_written "$CMD5file"
fi

trap - INT TERM EXIT
exit 0