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 "tpt";} 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{	dst := Entrychan(chan of int, chan of Entry);	spawn selectproc((hd tl args).t().i, dst, (hd args).p().i);	return ref Value.T(dst);} selectproc(src, dst: Entrychan, query: Gatechan){	if(<-dst.sync == 0){		query <-= (Nilentry, nil);		src.sync <-= 0;		exit;	}	src.sync <-= 1;	reply := chan of int;	while((d := <-src.c).t0 != nil){		query <-= (d, reply);		if(<-reply)			dst.c <-= d;	}	dst.c <-= Nilentry;	query <-= (Nilentry, nil);}