implement Fsmodule;include "sys.m";	sys: Sys;include "draw.m";include "sh.m";	sh: Sh;	Context: import sh;include "fslib.m";	fslib: Fslib;	Option, Value, Entrychan, Report: import fslib; # usage: exec [-n nfiles] [-t endcmd] [-pP] command entriestypes(): string{	return "vct-ns-tc-p-P";} badmod(p: string){	sys->fprint(sys->fildes(2), "fs: exec: 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);	sh = load Sh Sh->PATH;	if(sh == nil)		badmod(Sh->PATH);	sh->initialise();} run(drawctxt: ref Draw->Context, report: ref Report,			opts: list of Option, args: list of ref Value): ref Value{	n := 1;	pflag := 0;	tcmd: ref Sh->Cmd;	for(; opts != nil; opts = tl opts){		o := hd opts;		case o.opt {		'n' =>			if((n = int (hd o.args).s().i) <= 0){				sys->fprint(sys->fildes(2), "fs: exec: invalid argument to -n\n");				return nil;			}		't' =>			tcmd = (hd o.args).c().i;		'p' =>			pflag = 1;		'P' =>			pflag = 2;		}	}	if(pflag && n > 1){		sys->fprint(sys->fildes(2), "fs: exec: cannot specify -p with -n %d\n", n);		return nil;	}	cmd := (hd args).c().i;	c := (hd tl args).t().i;	sync := chan of int;	spawn execproc(drawctxt, sync, n, pflag, c, cmd, tcmd, report.start("exec"));	sync <-= 1;	return ref Value.V(sync);} execproc(drawctxt: ref Draw->Context, sync: chan of int, n, pflag: int,		c: Entrychan, cmd, tcmd: ref Sh->Cmd, errorc: chan of string){	sys->pctl(Sys->NEWFD, 0::1::2::nil);	ctxt := Context.new(drawctxt);	<-sync;	if(<-sync == 0){		c.sync <-= 0;		errorc <-= nil;		exit;	}	c.sync <-= 1;	argv := ref Sh->Listnode(cmd, nil) :: nil; 	fl: list of ref Sh->Listnode;	nf := 0;	while(((d, p, nil) := <-c.c).t0 != nil){		fl = ref Sh->Listnode(nil, p) :: fl;		if(++nf >= n){			ctxt.set("file", rev(fl));			if(pflag)				setstatenv(ctxt, d, pflag);			fl = nil;			nf = 0;			{ctxt.run(argv, 0);} exception {"fail:*" =>;}		}	}	if(nf > 0){		ctxt.set("file", rev(fl));		{ctxt.run(argv, 0);} exception {"fail:*" =>;}	}	if(tcmd != nil){		ctxt.set("file", nil);		{ctxt.run(ref Sh->Listnode(tcmd, nil) :: nil, 0);} exception {"fail:*" =>;}	}	errorc <-= nil;} setenv(ctxt: ref Context, var: string, val: list of string){	ctxt.set(var, sh->stringlist2list(val));} setstatenv(ctxt: ref Context, dir: ref Sys->Dir, pflag: int){	setenv(ctxt, "mode", modes(dir.mode) :: nil);	setenv(ctxt, "uid", dir.uid :: nil);	setenv(ctxt, "mtime", string dir.mtime :: nil);	setenv(ctxt, "length", string dir.length :: nil); 	if(pflag > 1){		setenv(ctxt, "name", dir.name :: nil);		setenv(ctxt, "gid", dir.gid :: nil);		setenv(ctxt, "muid", dir.muid :: nil);		setenv(ctxt, "qid", sys->sprint("16r%ubx", dir.qid.path) :: string dir.qid.vers :: nil);		setenv(ctxt, "atime", string dir.atime :: nil);		setenv(ctxt, "dtype", sys->sprint("%c", dir.dtype) :: nil);		setenv(ctxt, "dev", string dir.dev :: nil);	}} mtab := array[] of {	"---",	"--x",	"-w-",	"-wx",	"r--",	"r-x",	"rw-",	"rwx"}; modes(mode: int): string{	s: string; 	if(mode & Sys->DMDIR)		s = "d";	else if(mode & Sys->DMAPPEND)		s = "a";	else if(mode & Sys->DMAUTH)		s = "A";	else		s = "-";	if(mode & Sys->DMEXCL)		s += "l";	else		s += "-";	s += mtab[(mode>>6)&7]+mtab[(mode>>3)&7]+mtab[mode&7];	return s;} rev[T](x: list of T): list of T{	l: list of T;	for(; x != nil; x = tl x)		l = hd x :: l;	return l;}