implement Fsmodule;include "sys.m";	sys: Sys;include "draw.m";include "sh.m";include "fslib.m";	fslib: Fslib;	Report, Value, type2s, quit: import fslib;	Fschan, Fsdata, Entrychan, Entry,	Gatechan, Gatequery, Nilentry, Option,	Next, Down, Skip, Quit: import Fslib; types(): string{	return "ps";} badmod(p: string){	sys->fprint(sys->fildes(2), "fs: size: cannot load %s: %r\n", p);	raise "fail:bad module";} init(){	sys = load Sys Sys->PATH;	fslib = load Fslib Fslib->PATH;	if(fslib == nil)		badmod(Fslib->PATH);} run(nil: ref Draw->Context, nil: ref Report,			nil: list of Option, args: list of ref Value): ref Value{	d := int (hd args).s().i;	if(d <= 0){		sys->fprint(sys->fildes(2), "fs: depth: invalid depth\n");		return nil;	}	c := chan of Gatequery;	spawn depthgate(c, d);	return ref Value.P(c);} depthgate(c: Gatechan, d: int){	while((((dir, nil, depth), reply) := <-c).t0.t0 != nil)		reply <-= depth <= d;}