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implement Othello;
include "sys.m";
sys: Sys;
include "draw.m";
draw: Draw;
Point, Rect: import draw;
include "tk.m";
tk: Tk;
include "tkclient.m";
tkclient: Tkclient;
SQ: con 30; # Square size in pixels
N: con 8;
stderr: ref Sys->FD;
Othello: module {
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
Black, White, Nocolour: con iota;
colours := array[] of {White => "white", Black => "black"};
win: ref Tk->Toplevel;
board: array of array of int;
notifypid := -1;
membername: string;
membernames := array[2] of string;
init(ctxt: ref Draw->Context, argv: list of string)
{
sys = load Sys Sys->PATH;
stderr = sys->fildes(2);
draw = load Draw Draw->PATH;
tk = load Tk Tk->PATH;
tkclient = load Tkclient Tkclient->PATH;
if (tkclient == nil) {
sys->fprint(stderr, "othello: cannot load %s: %r\n", Tkclient->PATH);
raise "fail:bad module";
}
tkclient->init();
if (len argv >= 3) { # argv: modname mnt dir ...
membername = readfile(hd tl argv + "/name");
sys->print("name is %s\n", membername);
}
client1(ctxt);
}
configcmds := array[] of {
"canvas .c -height " + string (SQ * N) + " -width " + string (SQ * N) + " -bg green",
"label .status -text {No clique in progress}",
"frame .f",
"label .f.l -text {watching} -bg white",
"label .f.turn -text {}",
"pack .f.l -side left -expand 1 -fill x",
"pack .f.turn -side left -fill x -expand 1",
"pack .c -side top",
"pack .status .f -side top -fill x",
"bind .c <ButtonRelease-1> {send cmd b1up %x %y}",
};
client1(ctxt: ref Draw->Context)
{
cliquefd := sys->fildes(0);
sys->pctl(Sys->NEWPGRP, nil);
winctl: chan of string;
(win, winctl) = tkclient->toplevel(ctxt, nil,
"Othello", Tkclient->Appl);
bcmd := chan of string;
tk->namechan(win, bcmd, "cmd");
for (i := 0; i < len configcmds; i++)
cmd(win, configcmds[i]);
for (i = 0; i < N; i++)
for (j := 0; j < N; j++)
cmd(win, ".c create rectangle " + r2s(square(i, j)));
board = array[N] of {* => array[N] of {* => Nocolour}};
tkclient->onscreen(win, nil);
tkclient->startinput(win, "ptr"::"kbd"::nil);
spawn updateproc(cliquefd);
for (;;) alt {
c := <-bcmd =>
(n, toks) := sys->tokenize(c, " ");
case hd toks {
"b1up" =>
(inboard, x, y) := boardpos((int hd tl toks, int hd tl tl toks));
if (!inboard)
break;
othellocmd(cliquefd, "move " + string x + " " + string y);
cmd(win, "update");
}
s := <-win.ctxt.kbd =>
tk->keyboard(win, s);
s := <-win.ctxt.ptr =>
tk->pointer(win, *s);
s := <-win.ctxt.ctl or
s = <-win.wreq or
s = <-winctl =>
if (s == "exit")
sys->write(cliquefd, array[0] of byte, 0);
tkclient->wmctl(win, s);
}
}
othellocmd(fd: ref Sys->FD, s: string): int
{
if (sys->fprint(fd, "%s\n", s) == -1) {
notify(sys->sprint("%r"));
return 0;
}
return 1;
}
updateproc(cliquefd: ref Sys->FD)
{
buf := array[Sys->ATOMICIO] of byte;
while ((n := sys->read(cliquefd, buf, len buf)) > 0) {
(nil, lines) := sys->tokenize(string buf[0:n], "\n");
for (; lines != nil; lines = tl lines)
applyupdate(hd lines);
cmd(win, "update");
}
if (n < 0)
sys->fprint(stderr, "othello: error reading updates: %r\n");
sys->fprint(stderr, "othello: updateproc exiting\n");
}
applyupdate(s: string)
{
(nt, toks) := sys->tokenize(s, " ");
case hd toks {
"create" =>
; # ignore - there's only one object (the board)
"set" =>
# set objid attr val
toks = tl tl toks;
(attr, val) := (hd toks, hd tl toks);
case attr {
"members" =>
membernames[Black] = hd tl toks;
membernames[White] = hd tl tl toks;
status(membernames[Black]+ "(Black) vs. " + string membernames[White] + "(White)");
if (membername == membernames[Black])
cmd(win, ".f.l configure -text Black");
else if (membername == membernames[White])
cmd(win, ".f.l configure -text White");
"turn" =>
turn := int val;
if (turn != Nocolour) {
if (membername == membernames[turn])
cmd(win, ".f.turn configure -text {(Your turn)}");
else if (membername == membernames[!turn])
cmd(win, ".f.turn configure -text {}");
}
"winner" =>
text := "it was a draw";
winner := int val;
if (winner != Nocolour)
text = colours[int val] + " won.";
status("clique over. " + text);
cmd(win, ".f.l configure -text {watching}");
* =>
(x, y) := (attr[0] - 'a', attr[1] - 'a');
set(x, y, int val);
}
* =>
sys->fprint(stderr, "othello: unknown update message '%s'\n", s);
}
}
status(s: string)
{
cmd(win, ".status configure -text '" + s);
}
itemopts(colour: int): string
{
return "-fill " + colours[colour] +
" -outline " + colours[!colour];
}
set(x, y, colour: int)
{
id := piece(x, y);
if (colour == Nocolour)
cmd(win, ".c delete " + id);
else if (board[x][y] != Nocolour)
cmd(win, ".c itemconfigure " + id + " " + itemopts(colour));
else
cmd(win, ".c create oval " + r2s(square(x, y)) + " " +
itemopts(colour) +
" -tags {piece " + id + "}");
board[x][y] = colour;
}
notify(s: string)
{
kill(notifypid);
sync := chan of int;
spawn notifyproc(s, sync);
notifypid = <-sync;
}
notifyproc(s: string, sync: chan of int)
{
sync <-= sys->pctl(0, nil);
cmd(win, ".c delete notify");
id := cmd(win, ".c create text 0 0 -anchor nw -fill red -tags notify -text '" + s);
bbox := cmd(win, ".c bbox " + id);
cmd(win, ".c create rectangle " + bbox + " -fill #ffffaa -tags notify");
cmd(win, ".c raise " + id);
cmd(win, "update");
sys->sleep(750);
cmd(win, ".c delete notify");
cmd(win, "update");
notifypid = -1;
}
boardpos(p: Point): (int, int, int)
{
(x, y) := (p.x / SQ, p.y / SQ);
if (x < 0 || x > N - 1 || y < 0 || y > N - 1)
return (0, 0, 0);
return (1, x, y);
}
square(x, y: int): Rect
{
return ((SQ*x, SQ*y), (SQ*(x + 1), SQ*(y + 1)));
}
piece(x, y: int): string
{
return "p" + string x + "." + string y;
}
cmd(top: ref Tk->Toplevel, s: string): string
{
e := tk->cmd(top, s);
if (e != nil && e[0] == '!')
sys->fprint(stderr, "tk error %s on '%s'\n", e, s);
return e;
}
r2s(r: Rect): string
{
return sys->sprint("%d %d %d %d", r.min.x, r.min.y, r.max.x, r.max.y);
}
kill(pid: int)
{
if ((fd := sys->open("/prog/"+string pid+"/ctl", Sys->OWRITE)) != nil)
sys->write(fd, array of byte "kill", 4);
}
readfile(f: string): string
{
if ((fd := sys->open(f, Sys->OREAD)) == nil)
return nil;
a := array[8192] of byte;
n := sys->read(fd, a, len a);
if (n <= 0)
return nil;
return string a[0:n];
}
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