#!/usr/bin/awk -f

BEGIN {
	fieldstr = "pkgname _ver pkgver pkgrel pkgdesc epoch" \
		" *arch *license *options" \
		" install changelog" \
		" *depends *makedepends *checkdepends *optdepends" \
		" *conflicts *provides" \
		" url *source *noextract *md5sums *sha512sums" \
		" _dir"
	max = split(fieldstr, fields)
	for(i=1; i<=max; i++) {
		if(sub(/^[*]/, "", fields[i])){
			arrfield[fields[i]] = 1
		}else if(sub(/^_/, "", fields[i])){
			cfield[fields[i]] = 1
		}else{
			strfield[fields[i]] = 1
		}
	}

	COLS = 78; FS = "\n"; RS = ""
}

NF < 2 { next }

$1 == "packager" { packager = $2 }

$1 == "maintainer" { maintainer = $2 }

$1 == "customvars" {
	for(i = 2; i <= NF; i++){
		customvars[i - 1] = $i
	}
	customlen = NF - 1
}

{
	quotevals()
	if(($1 in strfield) || ($1 in cfield)){
		output[$1] = $2
	}else {
		arrtxt = wraparray(length($1) + 2)
		if(arrfield[$1]){
			output[$1] = arrtxt
		}else{
			unk[$1] = arrtxt
		}
	}
}

END {
	if(!maintainer && !packager) { packager = "Anonymous" }
	if(maintainer) print "# Maintainer: " maintainer
	else if(packager) print "# Packager: " packager
	print ""

	OFS = "="; ORS = "\n";
	for(i = 1; i <= customlen; i++){
		v = customvars[i]
		print "_" v, unk[v]
	}
	for(i=1; i<=max; i++){
		name = fields[i]
		if(!(name in output)){
			continue
		}

		if(name in cfield){
			print "_" name, output[name]
		}else{
			print name, output[name]
		}
	}
}

function wraparray (indent)
{
	if(NF == 1) return "()" # this shouldn't happen but just in case.

	line = ""
	delete lines
	linecount = 0

	i = 2
	while(i <= NF) {
		linelen = length(line)

		if((indent + linelen + 1 + length($i) > COLS) && linelen > 0) {
			lines[++linecount] = line
			line = ""
		} else {
			if(linelen == 0) line = $(i++)
			else line = line " " $(i++)
		}
	}

	if(length(line) > 0) lines[++linecount] = line

	indtxt = sprintf("%" indent "s", "")
	txt = "(" lines[1]
	for(i=2; i<=linecount; i++) txt = txt "\n" indtxt lines[i]
	txt = txt ")"

	return txt
}

function quotevals ()
{
	for(i=2; i<=NF; i++) $i = bashquote($i)
}

function bashquote (val)
{

	if(val ~ /[$'"`]/){
		gsub(/[$"`]/, "\\\\&", val)
		return sprintf("\"%s\"", val)
	}
	if(val ~ /[ <>]/) return sprintf("'%s'", val)
	return val
}