ref: 82b046f36f8084a22bbb5d71edd0edd9179561eb
dir: /appl/cmd/vixenplumb.b/
# keep track of vixen instances, register plumb dst "edit" and forward plumb messages
implement Vixenplumb;
include "sys.m";
sys: Sys;
sprint: import sys;
include "draw.m";
draw: Draw;
include "arg.m";
include "string.m";
str: String;
include "plumbmsg.m";
plumbmsg: Plumbmsg;
Msg: import plumbmsg;
include "sh.m";
sh: Sh;
include "names.m";
names: Names;
Vixenplumb: module {
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
dflag := 0;
Client: adt {
fid: int;
path: string; # path being edited
rc: Sys->Rread; # for read
pending: string; # pending string for next rc
text: fn(c: self ref Client): string;
};
Client.text(c: self ref Client): string
{
return sprint("Client(fid %d, path %q, rc nil %d, pending %q)", c.fid, c.path, c.rc == nil, c.pending);
}
clients: list of ref Client;
drawcontext: ref Draw->Context;
Iomax: con 8*1024; # max file2chan message size, also in vixenplumbreader() in vixen
init(ctxt: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
if(ctxt == nil)
fail("no window context");
drawcontext = ctxt;
draw = load Draw Draw->PATH;
arg := load Arg Arg->PATH;
str = load String String->PATH;
plumbmsg = load Plumbmsg Plumbmsg->PATH;
sh = load Sh Sh->PATH;
sh->initialise();
names = load Names Names->PATH;
sys->pctl(Sys->NEWPGRP, nil);
arg->init(args);
arg->setusage(arg->progname()+" [-d] [path]");
while((c := arg->opt()) != 0)
case c {
'd' => dflag++;
* => arg->usage();
}
args = arg->argv();
pathpat: string;
case len args {
0 => {}
1 => pathpat = hd args;
* => arg->usage();
}
if(plumbmsg->init(0, "edit", 0) < 0)
fail(sprint("plumb init: %r"));
fio := sys->file2chan("/chan", "vixenplumb");
if(fio == nil)
fail(sprint("file2chan: %r"));
msgc := chan of ref Msg;
spawn plumbreceiver(msgc);
if(pathpat != nil) {
wd := workdir();
spawn edit(wd, pathget(wd, pathpat));
}
spawn serve(fio, msgc);
}
serve(fio: ref Sys->FileIO, msgc: chan of ref Msg)
{
for(;;) alt {
m := <-msgc =>
if(m == nil)
fail("nil plumbmsg received");
handle(m);
(nil, count, fid, rc) := <-fio.read =>
if(rc == nil) {
del(fid);
} else if(count < Iomax) {
rc <-= (nil, sprint("read > Iomax (%d)", Iomax));
} else {
putrc(fid, rc);
}
(nil, data, fid, rc) := <-fio.write =>
if(rc == nil)
del(fid);
else {
err := set(fid, string data);
rc <-= (len data, err);
}
}
}
# given a working dir and a pathpat consisting of either absolute or relative path
# and an optional colon and address, return the final path and the pattern
pathget(wd, pathpat: string): (string, string)
{
(path, pat) := str->splitstrr(pathpat, ":");
if(path == nil) {
path = pat;
pat = nil;
} else
path = path[:len path-1];
if(!str->prefix("/", path) && !str->prefix("#", path))
path = wd+"/"+path;
if(pat == nil)
pat = ".";
path = names->cleanname(path);
return (path, pat);
}
edit(wd: string, pathpat: (string, string))
{
sys->pctl(Sys->FORKNS, nil); # separate working directory
(path, pat) := pathpat;
sys->chdir(wd);
say(sprint("edit, wd %q, path %q, pat %q", wd, path, pat));
if(pat == nil)
args := list of {"wm/vixen", path};
else
args = list of {"wm/vixen", "-c", ":"+pat, path};
sh->run(drawcontext, args);
}
write(fd: ref Sys->FD, s: string, pidc: chan of int, rc: chan of (int, string))
{
pidc <-= pid();
if(sys->write(fd, buf := array of byte s, len buf) != len buf)
rc <-= (0, sprint("write: %r"));
}
runeditnew(fd0: ref Sys->FD, dir: string, pidc: chan of int, rc: chan of (int, string))
{
pidc <-= pid();
sys->pctl(Sys->NEWFD|Sys->FORKNS|Sys->FORKENV, list of {fd0.fd, 1, 2});
sys->dup(fd0.fd, 0);
err := sh->run(drawcontext, list of {"wm/vixen", "-i", dir});
rc <-= (1, err);
}
editnew(dir, data: string)
{
sys->pctl(Sys->FORKNS, nil); # separate working directory
if(sys->chdir(dir) < 0)
return warn(sprint("chdir %q: %r", dir));
sys->pctl(Sys->NEWFD, list of {1, 2});
if(sys->pipe(fd0 := array[2] of ref Sys->FD) < 0)
return warn(sprint("pipe: %r"));
pidc := chan of int;
rc := chan of (int, string); # done, err
spawn write(fd0[0], data, pidc, rc);
writepid := <-pidc;
spawn runeditnew(fd0[1], dir, pidc, rc);
runpid := <-pidc;
fd0 = nil;
(done, err) := <-rc;
if(err != nil)
warn(err);
kill(writepid);
if(!done)
killgrp(runpid);
}
handle(m: ref Msg)
{
# see if it exists, if so, send it the pattern
# otherwise, start a new wm/vixen
say(sprint("msg: %s", string m.pack()));
case m.kind {
"text" =>
(path, pat) := pathget(m.dir, string m.data);
c := findpath(path);
if(c == nil) {
spawn edit(m.dir, (path, pat));
} else {
c.pending = pat;
respond(c);
}
"newtext" =>
c := findpath(m.dir);
if(c == nil) {
spawn editnew(names->cleanname(m.dir), string m.data);
} else {
c.pending = string m.data;
respond(c);
}
* =>
return warn(sprint("kind %q ignored", m.kind));
}
}
respond(c: ref Client)
{
say(sprint("respond, c %s", c.text()));
if(c.rc != nil && c.pending != nil) {
c.rc <-= (array of byte c.pending, nil);
c.rc = nil;
c.pending = nil;
}
}
putrc(fid: int, rc: Sys->Rread)
{
say(sprint("putrc, fid %d", fid));
for(l := clients; l != nil; l = tl l) {
c := hd l;
if(c.fid == fid) {
if(c.rc != nil)
rc <-= (nil, "one read at a time please");
else {
c.rc = rc;
respond(c);
}
return;
}
}
c := ref Client (fid, nil, rc, "");
clients = c::clients;
say(sprint("putrc, new client %s", c.text()));
}
del(fid: int)
{
nc: list of ref Client;
for(l := clients; l != nil; l = tl l)
if((hd l).fid != fid)
nc = hd l::nc;
clients = nc;
}
findpath(path: string): ref Client
{
for(l := clients; l != nil; l = tl l)
if((hd l).path == path)
return hd l;
return nil;
}
set(fid: int, path: string): string
{
o := findpath(path);
for(l := clients; l != nil; l = tl l) {
c := hd l;
if(c.fid == fid) {
if(o != nil && o != c)
return "file already open";
say(sprint("new path for client, fid %d, old path %q, new path %q", fid, c.path, path));
c.path = path;
return nil;
}
}
c := ref Client (fid, path, nil, "");
clients = c::clients;
say(sprint("set, new client %s", c.text()));
return nil;
}
plumbreceiver(msgc: chan of ref Msg)
{
for(;;)
msgc <-= Msg.recv();
}
workdir(): string
{
return sys->fd2path(sys->open(".", Sys->OREAD));
}
pid(): int
{
return sys->pctl(0, nil);
}
progctl(pid: int, s: string)
{
sys->fprint(sys->open(sprint("/prog/%d/ctl", pid), sys->OWRITE), "%s", s);
}
kill(pid: int)
{
progctl(pid, "kill");
}
killgrp(pid: int)
{
progctl(pid, "killgrp");
}
say(s: string)
{
if(dflag)
warn(s);
}
warn(s: string)
{
sys->fprint(sys->fildes(2), "%s\n", s);
}
fail(s: string)
{
warn(s);
killgrp(pid());
raise "fail:"+s;
}