ref: 02ac617541ca1a7bf82b1615fb5a58235469b5d3
dir: /appl/alphabet/fs/setroot.b/
implement Setroot, 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; Setroot: module {}; # set the root types(): string { return "xxs-c"; } 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, opts: list of Option, args: list of ref Value): ref Value { root := (hd tl args).s().i; if(root == nil && opts == nil){ sys->fprint(sys->fildes(2), "fs: setroot: empty path\n"); return nil; } v := ref Value.Vx(chan of (Fsdata, chan of int)); spawn setroot((hd args).x().i, v.i, root, opts != nil); return v; } setroot(src, dst: Fschan, root: string, cflag: int) { ((d, nil), reply) := <-src; if(cflag){ createroot(src, dst, root, d, reply); }else{ myreply := chan of int; rd := ref *d; rd.name = root; dst <-= ((rd, nil), myreply); if(<-myreply == Down){ reply <-= Down; fs->copy(src, dst); } } } createroot(src, dst: Fschan, root: string, d: ref Sys->Dir, reply: chan of int) { if(root == nil) root = d.name; (n, elems) := sys->tokenize(root, "/"); # XXX should really do a cleanname first if(root[0] == '/'){ elems = "/" :: elems; n++; } myreply := chan of int; lev := 0; r := -1; for(; elems != nil; elems = tl elems){ rd := ref *d; rd.name = hd elems; dst <-= ((rd, nil), myreply); case r = <-myreply { Quit => (<-src).t1 <-= Quit; exit; Skip => break; Next => lev++; break; } lev++; } if(r == Down){ reply <-= Down; if(fs->copy(src, dst) == Quit) exit; }else reply <-= Quit; while(lev-- > 1){ dst <-= ((nil, nil), myreply); if(<-myreply == Quit){ (<-src).t1 <-= Quit; exit; } } }