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% slrnface - feeble attempt at delivering X-Faces to slrn users
% Copyright (C) 2000, 2001, 2002 Drazen Kacar
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software
% Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
implements ("slrnface");
variable fp; % Pipe to slrnface
define clear ()
{
% This if is in case somebody's been messing with our private
% variables. It shouldn't happen, but you never know.
if (fp != NULL)
{
fputs ("clear\n", fp);
fflush (fp);
}
}
define read ()
{
variable xface;
if (fp != NULL)
{
xface = extract_article_header ("X-Face");
if (xface != "")
fputs ("xface " + xface + "\n", fp);
else
clear ();
fflush (fp);
}
}
define my_hide_article ()
{
% Too bad slrn doesn't have a way to return function bound to a
% certain key. If some other macro package binds its own function to
% the key 'h' it will never be called, or this function will never be
% called, depending on who made definekey call last.
%
% And this functionality doesn't have to be bound to 'h' in the first
% place. We'd actually like to know which key will call hide_article
% and then bind this function to that key. A hook would serve the
% purpose better, though.
call ("hide_article");
if (is_article_visible ())
read ();
else
{
if (fp != NULL)
{
fputs ("clear\n", fp);
fflush (fp);
}
}
}
define startup ()
{
variable success, home, reason, envvar;
fp = NULL;
home = make_home_filename (".slrnfaces");
if (home == NULL)
{
message_now ("Cannot run slrnface: home directory undefined.");
return;
}
% If DISPLAY is not set slrnface can't run, but the user probably
% knows that, so fail silently.
envvar = getenv ("DISPLAY");
if (envvar == NULL)
return;
% On the other hand, yell if WINDOWID is not set.
envvar = getenv ("WINDOWID");
if (envvar == NULL)
{
message_now ("Cannot run slrnface: $WINDOWID undefined.");
return;
}
if (mkdir (home, 0700) != 0)
{
if (errno != EEXIST)
{
reason = "cannot create " + home + ": " + errno_string(errno);
message_now ("Cannot run slrnface: " + reason);
return;
}
}
else
{
variable fpm, message;
fpm = fopen (home + "/README", "w");
if (fpm != NULL)
{
message =
"This directory is used to create named pipes for communication between\n" +
"slrnface and its parent process. It should normally be empty because\n" +
"the pipe is deleted right after it has been opened by both processes.\n\n" +
"File names generated by slrnface have the form \"hostname.pid\". It is\n" +
"probably an error if they linger here longer than a fraction of a second.\n" +
"\nHowever, if the directory is mounted from an NFS server, you might see\n" +
"special files created by your NFS server while slrnface is running.\n" +
"Do not try to remove them.\n";
fputs (message, fpm);
fclose (fpm);
}
}
% This is our FIFO.
home = home + "/" + uname().nodename + "." + string (getpid ());
% If it already exists, we'll delete it first. Because it really
% shouldn't exist.
remove (home);
if (mkfifo (home, 0600) != 0)
{
reason = "cannot create FIFO: " + errno_string(errno);
message_now ("Cannot run slrnface: " + reason);
return;
}
success = system ("slrnface " + home) shr 8;
switch (success)
{ case 0: fp = fopen (home, "w");
if (fp != NULL)
{
fputs ("start\n", fp);
fflush (fp);
remove (home);
% Seems everything's peachy keen, so we can register hooks.
register_hook ("followup_hook", "slrnface->clear");
register_hook ("forward_hook", "slrnface->clear");
register_hook ("group_mode_hook", "slrnface->clear");
register_hook ("post_hook", "slrnface->clear");
register_hook ("reply_hook", "slrnface->clear");
register_hook ("supersede_hook", "slrnface->clear");
register_hook ("read_article_hook", "slrnface->read");
definekey ("slrnface->my_hide_article", "h", "article");
return;
}
else
reason = "cannot open " + home + ": " + errno_string(errno);
}
% case 1 means DISPLAY is set, but slrnface couldn't connect. Probably
% because X server refused. We need to inform the user about this.
{ case 1: reason = "couldn't connect to display."; }
{ case 2: reason = "WINDOWID not found in environment."; }
{ case 3: reason = "couldn't find controlling terminal."; }
{ case 4: reason = "terminal doesn't export width and height."; }
{ case 5: reason = "cannot open " + home + " as FIFO."; }
{ case 6: reason = "fork() failed."; }
{ reason = "error " + string (success) + " (unknown reason)."; }
% Delete the FIFO.
remove (home);
message_now ("Slrnface failed: " + reason);
}
register_hook ("startup_hook", "slrnface->startup");
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