ref: 02ac617541ca1a7bf82b1615fb5a58235469b5d3
dir: /appl/alphabet/fs/depth.b/
implement Depth, Fsmodule; include "sys.m"; sys: Sys; include "draw.m"; include "sh.m"; include "alphabet/reports.m"; Report: import Reports; include "alphabet/fs.m"; fs: Fs; Value: import fs; Fschan, Fsdata, Entrychan, Entry, Gatechan, Gatequery, Nilentry, Option, Next, Down, Skip, Quit: import Fs; Depth: module {}; 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; fs = load Fs Fs->PATH; if(fs == nil) badmod(Fs->PATH); fs->init(); } 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.Vp(c); } depthgate(c: Gatechan, d: int) { while((((dir, nil, depth), reply) := <-c).t0.t0 != nil) reply <-= depth <= d; }