#!/bin/rc

rfork n

fn usage {
	echo usage: patchsources [-r] >[1=2]
	exit
}

addr=sources
src=/n/$addr/patch
dst=/tmp/sources

if(~ $#* 1 && ~ $1 -r){
	if(test -e $dst){
		rm -rf $dst
	}
	mkdir $dst
	shift
}

if(! ~ $#* 0){
	usage
}

if(! test -d $dst){
	destination $dst does not exist
	exit
}

if(! test -d $src){
	9fs $addr
	if(! ~ $status ''){
		echo $status
		exit
	}
}

repo=( \
	. \
	bad \
	maybe \
	saved \
	sorry \
	applied \
)

for(r in $repo){
	if(! test -d $dst/$r) {
		mkdir $dst/$r
	}

	lst=`{ls -tr $src/$r}

	for(i in $lst){
		s=`{cleanname $i}
		n=`{basename $i}
		diff=$dst/$r/$n.diff

		if(! test -f $diff && test -f $s/readme) {
			patch2diff $s > $diff
			if(! test -s $diff){
				rm $diff
			}
		}
	}
}

for(i in $dst/*.diff) {
	n=`{basename $i | sed s,.diff,,}
	if(! test -d $src/$n){
		rm $i
	}
}