#!/bin/sh

prog=makepkgmeta

lazysource()
{
	awk -v prog="$prog" '
BEGIN { FS = "\n"; RS = ""; OFS = ORS = "\n\n" }
$1 == "pkgver" { ver = $2 }
$1 == "source" {
	len = NF - 1
	for (i = 2; i <= NF; i++) sources[i - 1] = $i
	next
}
1 # print everything but sources

END {
	# remember that metas emit no output when they cant match
	# a package.
	if (NR == 0) exit 0

	ORS="\n"
	if (!ver) {
		print prog ": wtf? pkgver is empty!" | "cat 1>&2"
		exit 1
	}
	
	# Replace any version strings in the source file with ${pkgver}.
	gsub(/[.]/, "\\\\&", ver)

	print "source"
	for(i = 1; i <= len; i++) {
		gsub(ver, "${pkgver}", sources[i])
		print sources[i]
	}
	print ""
}'
	return $?
} # end of lazysource()

basicmeta()
{
	printf "pkgname\n%s\n\n" "$1"
	printf "pkgrel\n%d\n\n" "${PKGREL:-1}"
	printf "packager\n%s\n\n" "${PACKAGER:-Anonymous}"
	
	if [ "$MAINTAINER" ]
	then
		printf "maintainer\n%s\n\n" "$MAINTAINER"
	fi
}

case $# in
0)	echo "Usage: $prog [pkgname]" 1>&2
	exit 1
esac

case "$METABIN" in
'')	echo "$prog: set METABIN before calling $prog" 1>&2
	exit 2
esac

for flav in "$METABIN"/*
do
	[ -f "$flav" -a -x "$flav" ] || continue
	PATH="$PATH:$flav.d" "$flav" $1 | lazysource
	metaret=$?
	case $metaret in
	0)	basicmeta $1
		exit 0 ;;
	1)	;; # loop
	2)	echo "error: $flav encountered an error" 1>&2
		exit 2 ;;
	*)	echo "error: $flav returned error code $metaret" 1>&2
		exit 2 ;;
	esac
done

echo "error: no matching meta generator found for '$1'" 1>&2
exit 1