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#!/bin/sh

prog=genpkg

metad=~/.genpkg/metas
templd=~/.genpkg/templ
tweakd=~/pkg/tweaks
pkgd=~/pkg/dest
vard=~/.genpkg/var

mergefile()
{
	fname="$1"
	shift

	if [ -f "$fname.$$" ]
	then
		echo "$prog: error: temp file already exists: $fname.$$" 1>&2
		return 1
	fi

	while [ "$#" -gt 0 ]
	do
		sect="$1"
		shift
		getpkgtree "$fname" "$sect" >> "$fname.$$"

		case "$?" in
		0)	;;
		101)	echo "$prog: error: missing file in PKGTREE: $fname" 1>&2
			return 101 ;;
		102)	continue ;; # empty section so don't echo a newline below
		*)	echo "$prog: unknown error from getpkgtree: $?" 1>&2
			return 1 ;;
		esac

		[ "$#" -gt 0 ] && echo >> "$fname.$$"
	done

	if du "$fname.$$" | awk '$1 == 0 { exit 1 }'
	then
		mv "$fname.$$" "$fname"
		return 0
	else
		rm "$fname.$$"
		return 1
	fi
}

if [ $# -lt 1 ]
then
	echo "usage: $prog [package name]" 1>&2
	exit 2
fi

if ! [ -d "$tweakd" ]
then
	echo "$prog: bad package tweaks dir: $tweakd" 1>&2
	exit 1
fi

if ! [ -d "$pkgd" ]
then
	echo "$prog: bad package dest dir: $pkgd" 1>&2
	exit 1
fi

if ! [ -d "$vard" ]
then
	echo "$prog: bad package var dir: $vard" 1>&2
	exit 1
fi

for pkg
do
	[ -d "$pkgd/$pkg" ] || mkdir "$pkgd/$pkg"
	cd "$pkgd/$pkg"

	[ -d PKGTREE ] && rm -rf PKGTREE
	mkdir PKGTREE

	trap 'rm -f PKGDATA' 1 2 15
	if METABIN="$metad" PKGVAR="$vard" prepkg "$pkg" > PKGDATA
	then
		echo "$pkgd/$pkg"
	else
		rm PKGDATA
		exit "$?"
	fi

	#twk="$tweakd/$pkg"
	#if [ -f "$twk" -a -r "$twk" ] && modmetapkg
	#then
	#	echo "Modified metapackage." 1>&2
	#fi

	pbfields < PKGDATA | putpkgtree PKGBUILD prefix body || exit "$?"
	mergefile PKGBUILD prefix build check package suffix || exit "$?"
done