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% File: latex_comm.sl -*- mode: SLang -*-
%
% Copyright (c)
% 2006--2007 Jörg Sommer <joerg@alea.gnuu.de>
% $Id: latex_comm.sl 199 2007-08-23 23:28:52Z joerg $
%
% -*- This file is part of Jörg's LaTeX Mode (JLM) -*-
%
% Description: The dvi viewer Xdvi can communicate with the editor to
% move the cursor to the possition of the file that is
% related to the paragraph currently shown.
%
% This file implements the communication helper for xdvi.
%
% License: 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.
% Fixme: This is ugly, but
% jed-script foo -> __argv = ["foo"]
% jed --script foo -> __argv = ["jed", "--script", "foo"]
_for(0, length(__argv), 1)
{
$0 = ();
if ( is_substr(__argv[$0], "latex_comm.sl") )
{
++$0;
break;
}
}
variable args = __argv[[$0:]];
variable STDIN_FILENO = fileno(stdin);
variable STDOUT_FILENO = fileno(stdout);
if ( andelse {length(args) == 1} {args[0] == "watch"} )
{
variable fifo_name = "/tmp/jed.latex." + string(getpid());
if (mkfifo(fifo_name, 0600) != 0)
throw ApplicationError, "Could not create FIFO";
() = write(STDOUT_FILENO, "communicator created: $fifo_name\n"$);
#ifexists SIGHUP
variable quit = 0;
eval("define sig_handler(sig) { quit = 1; }");
signal(SIGHUP, __get_reference("sig_handler") );
signal(SIGINT, __get_reference("sig_handler") );
signal(SIGTERM, __get_reference("sig_handler") );
# iffalse
% slang 2.0 has a bug---signal is set to restart system calls.
% However, once a signal is caught, the signal will be set to
% interrupt them, which is the correct behavior for the interpreter.
% Force that here.
() = kill(getpid(), SIGHUP);
() = kill(getpid(), SIGINT);
() = kill(getpid(), SIGTERM);
quit = 0;
# endif
#endif
try
{
forever
{
variable fifo = open(fifo_name, O_RDONLY);
if (fifo == NULL)
break;
#ifexists quit
if (quit)
{
() = close(fifo);
break;
}
#endif
try
{
variable line, last_line;
while (read(fifo, &line, 128) > 0)
{
() = write(STDOUT_FILENO, line);
last_line = line;
}
if (andelse {bstrlen(last_line) >= 5}
{last_line[[-5:-1]] == "quit\n"B})
break;
}
finally
() = close(fifo);
}
}
finally
() = remove(fifo_name);
}
else
{
if (length(args) < 2)
throw NumArgsError, "missing arguments";
variable stat = stat_file(args[0]);
!if ( andelse {stat != NULL} {stat_is("fifo", stat.st_mode)} )
throw InvalidParmError, "File "+args[0]+" do not exist or is not a FIFO";
variable fifo = open(args[0], O_WRONLY);
try
{
() = write(fifo, strjoin(args[[1:]], " ") + "\n");
}
finally
() = close(fifo);
}
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