ref: c116550e6a41572796e4db65e4f6acbcb3d9d6f8
dir: /appl/lib/wmlib.b/
implement Wmlib;
#
# Copyright © 2003 Vita Nuova Holdings Limited
#
# basic window manager functionality, used by
# tkclient and wmclient to create more usable functionality.
include "sys.m";
sys: Sys;
include "draw.m";
draw: Draw;
Display, Image, Screen, Rect, Point, Pointer, Wmcontext, Context: import draw;
include "wmsrv.m";
include "wmlib.m";
Client: adt{
ptrpid: int;
kbdpid: int;
ctlpid: int;
req: chan of (array of byte, Sys->Rwrite);
dir: string;
ctlfd: ref Sys->FD;
winfd: ref Sys->FD;
};
DEVWM: con "/mnt/wm";
Ptrsize: con 1+4*12; # 'm' plus 4 12-byte decimal integers
kbdstarted: int;
ptrstarted: int;
wptr: chan of Point; # set mouse position (only if we've opened /dev/pointer directly)
cswitch: chan of (string, int, chan of string); # switch cursor images (as for wptr)
init()
{
sys = load Sys Sys->PATH;
draw = load Draw Draw->PATH;
}
# (_screen, dispi) := ctxt.display.getwindow("/dev/winname", nil, nil, 1); XXX corrupts heap... fix it!
makedrawcontext(): ref Draw->Context
{
display := Display.allocate(nil);
if(display == nil){
sys->fprint(sys->fildes(2), "wmlib: can't allocate Display: %r\n");
raise "fail:no display";
}
return ref Draw->Context(display, nil, nil);
}
importdrawcontext(devdraw, mntwm: string): (ref Draw->Context, string)
{
if(mntwm == nil)
mntwm = "/mnt/wm";
display := Display.allocate(devdraw);
if(display == nil)
return (nil, sys->sprint("cannot allocate display: %r"));
(ok, nil) := sys->stat(mntwm + "/clone");
if(ok == -1)
return (nil, "cannot find wm namespace");
wc := chan of (ref Draw->Context, string);
spawn wmproxy(display, mntwm, wc);
return <-wc;
}
# XXX we have no way of knowing when this process should go away...
# perhaps a Draw->Context should hold a file descriptor
# so that we do.
wmproxy(display: ref Display, dir: string, wc: chan of (ref Draw->Context, string))
{
wmsrv := load Wmsrv Wmsrv->PATH;
if(wmsrv == nil){
wc <-= (nil, sys->sprint("cannot load %s: %r", Wmsrv->PATH));
return;
}
sys->pctl(Sys->NEWFD, 1 :: 2 :: nil);
(wm, join, req) := wmsrv->init();
if(wm == nil){
wc <-= (nil, sys->sprint("%r"));
return;
}
wc <-= (ref Draw->Context(display, nil, wm), nil);
clients: array of ref Client;
for(;;) alt{
(sc, rc) := <-join =>
sync := chan of (ref Client, string);
spawn clientproc(display, sc, dir, sync);
(c, err) := <-sync;
rc <-= err;
if(c != nil){
if(sc.id >= len clients)
clients = (array[sc.id + 1] of ref Client)[0:] = clients;
clients[sc.id] = c;
}
(sc, data, rc) := <-req =>
clients[sc.id].req <-= (data, rc);
if(rc == nil)
clients[sc.id] = nil;
}
}
zclient: Client;
clientproc(display: ref Display, sc: ref Wmsrv->Client, dir: string, rc: chan of (ref Client, string))
{
ctlfd := sys->open(dir + "/clone", Sys->ORDWR);
if(ctlfd == nil){
rc <-= (nil, sys->sprint("cannot open %s/clone: %r", dir));
return;
}
buf := array[20] of byte;
n := sys->read(ctlfd, buf, len buf);
if(n <= 0){
rc <-= (nil, "cannot read ctl id");
return;
}
sys->fprint(ctlfd, "fixedorigin");
dir += "/" + string buf[0:n];
c := ref zclient;
c.req = chan of (array of byte, Sys->Rwrite);
c.dir = dir;
c.ctlfd = ctlfd;
if ((c.winfd = sys->open(dir + "/winname", Sys->OREAD)) == nil){
rc <-= (nil, sys->sprint("cannot open %s/winname: %r", dir));
return;
}
rc <-= (c, nil);
pidc := chan of int;
spawn ctlproc(pidc, ctlfd, sc.ctl);
c.ctlpid = <-pidc;
for(;;) {
(data, drc) := <-c.req;
if(drc == nil)
break;
err := handlerequest(display, c, sc, data);
n = len data;
if(err != nil)
n = -1;
alt{
drc <-= (n, err) =>;
* =>;
}
}
sc.stop <-= 1;
kill(c.kbdpid, "kill");
kill(c.ptrpid, "kill");
kill(c.ctlpid, "kill");
c.ctlfd = nil;
c.winfd = nil;
}
handlerequest(display: ref Display, c: ref Client, sc: ref Wmsrv->Client, data: array of byte): string
{
req := string data;
if(req == nil)
return nil;
(w, e) := qword(req, 0);
case w {
"start" =>
(w, e) = qword(req, e);
case w {
"ptr" or
"mouse" =>
if(c.ptrpid == -1)
return "already started";
fd := sys->open(c.dir + "/pointer", Sys->OREAD);
if(fd == nil)
return sys->sprint("cannot open %s: %r", c.dir + "/pointer");
sync := chan of int;
spawn ptrproc(sync, fd, sc.ptr);
c.ptrpid = <-sync;
return nil;
"kbd" =>
if(c.kbdpid == -1)
return "already started";
sync := chan of (int, string);
spawn kbdproc(sync, c.dir + "/keyboard", sc.kbd);
(pid, err) := <-sync;
c.kbdpid = pid;
return err;
}
}
if(sys->write(c.ctlfd, data, len data) == -1)
return sys->sprint("%r");
if(req[0] == '!'){
buf := array[100] of byte;
n := sys->read(c.winfd, buf, len buf);
if(n <= 0)
return sys->sprint("read winname: %r");
name := string buf[0:n];
# XXX this is the dodgy bit...
i := display.namedimage(name);
if(i == nil)
return sys->sprint("cannot get image %#q: %r", name);
s := Screen.allocate(i, display.white, 0);
i = s.newwindow(i.r, Draw->Refnone, Draw->Nofill);
rc := chan of int;
sc.images <-= (nil, i, rc);
if(<-rc == -1)
return "image request already in progress";
}
return nil;
}
connect(ctxt: ref Context): ref Wmcontext
{
# don't automatically make a new Draw->Context, 'cos the
# client should be aware that there's no wm so multiple
# windows won't work correctly.
# ... unless there's an exported wm available, of course!
if(ctxt == nil){
sys->fprint(sys->fildes(2), "wmlib: no draw context\n");
raise "fail:error";
}
if(ctxt.wm == nil){
wm := ref Wmcontext(
chan of int,
chan of ref Draw->Pointer,
chan of string,
nil, # unused
chan of ref Image,
nil,
ctxt
);
return wm;
}
fd := sys->open("/chan/wmctl", Sys->ORDWR);
if(fd == nil){
sys->fprint(sys->fildes(2), "wmlib: cannot open /chan/wmctl: %r\n");
raise "fail:error";
}
buf := array[32] of byte;
n := sys->read(fd, buf, len buf);
if(n < 0){
sys->fprint(sys->fildes(2), "wmlib: cannot get window token: %r\n");
raise "fail:error";
}
reply := chan of (string, ref Wmcontext);
ctxt.wm <-= (string buf[0:n], reply);
(err, wm) := <-reply;
if(err != nil){
sys->fprint(sys->fildes(2), "wmlib: cannot connect: %s\n", err);
raise "fail:" + err;
}
wm.connfd = fd;
wm.ctxt = ctxt;
return wm;
}
startinput(wm: ref Wmcontext, devs: list of string): string
{
for(; devs != nil; devs = tl devs)
wmctl(wm, "start " + hd devs);
return nil;
}
reshape(wm: ref Wmcontext, name: string, r: Draw->Rect, i: ref Draw->Image, how: string): ref Draw->Image
{
if(name == nil)
return nil;
(nil, ni, err) := wmctl(wm, sys->sprint("!reshape %s -1 %d %d %d %d %s", name, r.min.x, r.min.y, r.max.x, r.max.y, how));
if(err == nil)
return ni;
return i;
}
#
# wmctl implements the default window behaviour
#
wmctl(wm: ref Wmcontext, request: string): (string, ref Image, string)
{
(w, e) := qword(request, 0);
case w {
"exit" =>
kill(sys->pctl(0, nil), "killgrp");
exit;
* =>
if(wm.connfd != nil){
# standard form for requests: if request starts with '!',
# then the next word gives the tag of the window that the
# request applies to, and a new image is provided.
if(sys->fprint(wm.connfd, "%s", request) == -1){
sys->fprint(sys->fildes(2), "wmlib: wm request '%s' failed\n", request);
return (nil, nil, sys->sprint("%r"));
}
if(request[0] == '!'){
i := <-wm.images;
if(i == nil)
i = <-wm.images;
return (qword(request, e).t0, i, nil);
}
return (nil, nil, nil);
}
# requests we can handle ourselves, if we have to.
case w{
"start" =>
(w, e) = qword(request, e);
case w{
"ptr" or
"mouse" =>
if(!ptrstarted){
fd := sys->open("/dev/pointer", Sys->ORDWR);
if(fd != nil)
wptr = chan of Point;
else
fd = sys->open("/dev/pointer", Sys->OREAD);
if(fd == nil)
return (nil, nil, sys->sprint("cannot open /dev/pointer: %r"));
cfd := sys->open("/dev/cursor", Sys->OWRITE);
if(cfd != nil)
cswitch = chan of (string, int, chan of string);
spawn wptrproc(fd, cfd);
sync := chan of int;
spawn ptrproc(sync, fd, wm.ptr);
<-sync;
ptrstarted = 1;
}
"kbd" =>
if(!kbdstarted){
sync := chan of (int, string);
spawn kbdproc(sync, "/dev/keyboard", wm.kbd);
(nil, err) := <-sync;
if(err != nil)
return (nil, nil, err);
spawn sendreq(wm.ctl, "haskbdfocus 1");
kbdstarted = 1;
}
* =>
return (nil, nil, "unknown input source");
}
return (nil, nil, nil);
"ptr" =>
if(wptr == nil)
return (nil, nil, "cannot change mouse position");
p: Point;
(w, e) = qword(request, e);
p.x = int w;
(w, e) = qword(request, e);
p.y = int w;
wptr <-= p;
return (nil, nil, nil);
"cursor" =>
if(cswitch == nil)
return (nil, nil, "cannot switch cursor");
cswitch <-= (request, e, reply := chan of string);
return (nil, nil, <-reply);
* =>
return (nil, nil, "unknown wmctl request");
}
}
}
sendreq(c: chan of string, s: string)
{
c <-= s;
}
ctlproc(sync: chan of int, fd: ref Sys->FD, ctl: chan of string)
{
sync <-= sys->pctl(0, nil);
buf := array[4096] of byte;
while((n := sys->read(fd, buf, len buf)) > 0)
ctl <-= string buf[0:n];
}
kbdproc(sync: chan of (int, string), f: string, keys: chan of int)
{
sys->pctl(Sys->NEWFD, nil);
fd := sys->open(f, Sys->OREAD);
if(fd == nil){
sync <-= (-1, sys->sprint("cannot open /dev/keyboard: %r"));
return;
}
sync <-= (sys->pctl(0, nil), nil);
buf := array[12] of byte;
while((n := sys->read(fd, buf, len buf)) > 0){
s := string buf[0:n];
for(j := 0; j < len s; j++)
keys <-= int s[j];
}
}
wptrproc(pfd, cfd: ref Sys->FD)
{
if(wptr == nil && cswitch == nil)
return;
if(wptr == nil)
wptr = chan of Point;
if(cswitch == nil)
cswitch = chan of (string, int, chan of string);
for(;;)alt{
p := <-wptr =>
sys->fprint(pfd, "m%11d %11d", p.x, p.y);
(c, start, reply) := <-cswitch =>
buf: array of byte;
if(start == len c){
buf = array[0] of byte;
}else{
hot, size: Point;
(w, e) := qword(c, start);
hot.x = int w;
(w, e) = qword(c, e);
hot.y = int w;
(w, e) = qword(c, e);
size.x = int w;
(w, e) = qword(c, e);
size.y = int w;
((d0, d1), nil) := splitqword(c, e);
nb := size.x/8*size.y;
if(d1 - d0 != nb * 2){
reply <-= "inconsistent cursor image data";
break;
}
buf = array[4*4 + nb] of byte;
bplong(buf, 0*4, hot.x);
bplong(buf, 1*4, hot.y);
bplong(buf, 2*4, size.x);
bplong(buf, 3*4, size.y);
j := 4*4;
for(i := d0; i < d1; i += 2)
buf[j++] = byte ((hexc(c[i]) << 4) | hexc(c[i+1]));
}
if(sys->write(cfd, buf, len buf) != len buf)
reply <-= sys->sprint("%r");
else
reply <-= nil;
}
}
hexc(c: int): int
{
if(c >= '0' && c <= '9')
return c - '0';
if(c >= 'a' && c <= 'f')
return c - 'a' + 10;
if(c >= 'A' && c <= 'F')
return c - 'A' + 10;
return 0;
}
bplong(d: array of byte, o: int, x: int)
{
d[o] = byte x;
d[o+1] = byte (x >> 8);
d[o+2] = byte (x >> 16);
d[o+3] = byte (x >> 24);
}
ptrproc(sync: chan of int, fd: ref Sys->FD, ptr: chan of ref Draw->Pointer)
{
sync <-= sys->pctl(0, nil);
b:= array[Ptrsize] of byte;
while(sys->read(fd, b, len b) > 0){
p := bytes2ptr(b);
if(p != nil)
ptr <-= p;
}
}
bytes2ptr(b: array of byte): ref Pointer
{
if(len b < Ptrsize || int b[0] != 'm')
return nil;
x := int string b[1:13];
y := int string b[13:25];
but := int string b[25:37];
msec := int string b[37:49];
return ref Pointer (but, (x, y), msec);
}
snarfbuf: string; # at least we get *something* when there's no wm.
snarfget(): string
{
fd := sys->open("/chan/snarf", sys->OREAD);
if(fd == nil)
return snarfbuf;
buf := array[8192] of byte;
nr := 0;
while ((n := sys->read(fd, buf[nr:], len buf - nr)) > 0) {
nr += n;
if (nr == len buf) {
nbuf := array[len buf * 2] of byte;
nbuf[0:] = buf;
buf = nbuf;
}
}
return string buf[0:nr];
}
snarfput(buf: string)
{
fd := sys->open("/chan/snarf", sys->OWRITE);
if(fd != nil)
sys->fprint(fd, "%s", buf);
else
snarfbuf = buf;
}
# return (qslice, end).
# the slice has a leading quote if the word is quoted; it does not include the terminating quote.
splitqword(s: string, start: int): ((int, int), int)
{
for(; start < len s; start++)
if(s[start] != ' ')
break;
if(start >= len s)
return ((start, start), start);
i := start;
end := -1;
if(s[i] == '\''){
gotq := 0;
for(i++; i < len s; i++){
if(s[i] == '\''){
if(i + 1 >= len s || s[i + 1] != '\''){
end = i+1;
break;
}
i++;
gotq = 1;
}
}
if(!gotq && i > start+1)
start++;
if(end == -1)
end = i;
} else {
for(; i < len s; i++)
if(s[i] == ' ')
break;
end = i;
}
return ((start, i), end);
}
# unquote a string slice as returned by sliceqword.
qslice(s: string, r: (int, int)): string
{
if(r.t0 == r.t1)
return nil;
if(s[r.t0] != '\'')
return s[r.t0:r.t1];
t := "";
for(i := r.t0 + 1; i < r.t1; i++){
t[len t] = s[i];
if(s[i] == '\'')
i++;
}
return t;
}
qword(s: string, start: int): (string, int)
{
(w, next) := splitqword(s, start);
return (qslice(s, w), next);
}
s2r(s: string, e: int): (Rect, int)
{
r: Rect;
w: string;
(w, e) = qword(s, e);
r.min.x = int w;
(w, e) = qword(s, e);
r.min.y = int w;
(w, e) = qword(s, e);
r.max.x = int w;
(w, e) = qword(s, e);
r.max.y = int w;
return (r, e);
}
kill(pid: int, note: string): int
{
fd := sys->open("#p/"+string pid+"/ctl", Sys->OWRITE);
if(fd == nil) # dodgy failover
fd = sys->open("/prog/"+string pid+"/ctl", Sys->OWRITE);
if(fd == nil || sys->fprint(fd, "%s", note) < 0)
return -1;
return 0;
}