#!/bin/sh

set -eu

infile="$1"
outfile="$2"
pkgfiles="$3"
tweakfiles="$4"

outdir=$(dirname $outfile)
altinfile=$(dirname $infile)/script.sh.in
altoutfile=$outdir/script.sh

pkgdesc=$(perl -nE '/^[#]{2} (.*)/ and say "# $1"; /^[#]{1} (.*)/ and say "#  * $1"' $pkgfiles) #'
pkglist=$(perl -ne 'chomp; /^[^#]+/ and print "$_ "' $pkgfiles)

tweakdesc=$(perl -nE '/^[#]{2} (.*)/ and say "# $1"; /^[#]{1} (.*)/ and say "#  * $1"' $tweakfiles) #'
tweaklist=$(perl -ne 'chomp; /^(?!#)\s*(.+)/ and print "$1;"' $tweakfiles)

export pkgdesc pkglist tweakdesc tweaklist

mkdir -p $outdir
perl -p \
	-e 's,__PKGDESC__,$ENV{"pkgdesc"},;'\
	-e 's,__PKGLIST__,$ENV{"pkglist"},;'\
	-e 's,__TWEAKDESC__,$ENV{"tweakdesc"},;'\
	-e 's,__TWEAKLIST__,$ENV{"tweaklist"},;'\
	-e 's,chroot\s+/target\s+,,g;'\
	-e 's,/target/,/,g;'\
	< $altinfile \
	> $altoutfile~
mv -f $altoutfile~ $altoutfile
perl -p \
	-e 's,__PKGDESC__,$ENV{"pkgdesc"},;'\
	-e 's,__PKGLIST__,$ENV{"pkglist"},;'\
	-e 's,__TWEAKDESC__,$ENV{"tweakdesc"},;'\
	-e 's,__TWEAKLIST__,$ENV{"tweaklist"},;'\
	< $infile \
	> $outfile~
mv -f $outfile~ $outfile