//	Main program for Tcl-interface to PLplot.  Allows interpretive
//	execution of plotting primitives without regard to output driver.
//
// Maurice LeBrun
// IFS, University of Texas at Austin
// 19-Jun-1994
//
// Copyright (C) 2004  Joao Cardoso
//
// This file is part of PLplot.
//
// PLplot is free software; you can redistribute it and/or modify
// it under the terms of the GNU Library General Public License as published
// by the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// PLplot 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 Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public License
// along with PLplot; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
//

#include "plplotP.h"
#include "pltcl.h"
#ifdef HAVE_ITCL
# ifndef HAVE_ITCLDECLS_H
#  define RESOURCE_INCLUDED
# endif
# include <itcl.h>
#endif

static int
AppInit( Tcl_Interp *interp );

//--------------------------------------------------------------------------
// main --
//
// Just a stub routine to call pltclMain.  The latter is nice to have when
// building extended tclsh's, since then you don't have to rely on sucking
// the Tcl main out of libtcl (which doesn't work correctly on all
// systems/compilers/linkers/etc).  Hopefully in the future Tcl will
// supply a sufficiently capable tclMain() type function that can be used
// instead.
//--------------------------------------------------------------------------

int
main( int argc, char **argv )
{
    exit( pltclMain( argc, argv, NULL, AppInit ) );
}

//--------------------------------------------------------------------------
// plExitCmd
//
// PLplot/Tcl extension command -- handle exit.
// The reason for overriding the normal exit command is so we can tell
// the PLplot library to clean up.
//--------------------------------------------------------------------------

static int
plExitCmd( ClientData clientData, Tcl_Interp *interp, int argc, char **argv )
{
    const char *tmp = Tcl_GetStringResult( interp );
    (void) argc;
    (void) argv;
    (void) clientData;

// Print error message if one given that is not of zero length.
    if ( tmp != NULL && *tmp != '\0' )
        fprintf( stderr, "%s\n", Tcl_GetStringResult( interp ) );

    plspause( 0 );
    plend();

    Tcl_UnsetVar( interp, "tcl_prompt1", 0 );
    Tcl_Eval( interp, "tclexit" );

    return TCL_OK;
}

//--------------------------------------------------------------------------
// prPromptCmd
//
// PLplot/Tcl extension command -- print the prompt.
// Allows much more flexible setting of the prompt.
//--------------------------------------------------------------------------

static int
prPromptCmd( ClientData clientData, Tcl_Interp *interp, int argc, char **argv )
{
    PLStream *pls;
    char     prompt[80];
    (void) argc;
    (void) argv;
    (void) clientData;

    plgpls( &pls );

    if ( pls->ipls == 0 )
        sprintf( prompt, "pltext; puts -nonewline \"pltcl> \"; flush stdout" );
    else
        sprintf( prompt, "pltext; puts -nonewline \"pltcl_%d> \"; flush stdout", pls->ipls );

    Tcl_VarEval( interp, prompt, 0 );

    return TCL_OK;
}

//
//--------------------------------------------------------------------------
//
// AppInit --
//
//	This procedure performs application-specific initialization.
//	Most applications, especially those that incorporate additional
//	packages, will have their own version of this procedure.
//
// Results:
//	Returns a standard Tcl completion code, and leaves an error
//	message in interp->result if an error occurs.
//
// Side effects:
//	Depends on the startup script.
//
//--------------------------------------------------------------------------
//

static int
AppInit( Tcl_Interp *interp )
{
//
// Call the init procedures for included packages.  Each call should
// look like this:
//
// if (Mod_Init(interp) == TCL_ERROR) {
//     return TCL_ERROR;
// }
//
// where "Mod" is the name of the module.
//
    if ( Tcl_Init( interp ) == TCL_ERROR )
    {
        printf( "Error Tcl_Init\n" );
        return TCL_ERROR;
    }
#ifdef HAVE_ITCL
    if ( Itcl_Init( interp ) == TCL_ERROR )
    {
        return TCL_ERROR;
    }
#endif
    if ( Pltcl_Init( interp ) == TCL_ERROR )
    {
        return TCL_ERROR;
    }

// Application-specific startup.  That means: for use in pltcl ONLY.

// Rename "exit" to "tclexit", and insert custom exit handler

    Tcl_VarEval( interp, "rename exit tclexit", (char *) NULL );

    Tcl_CreateCommand( interp, "exit", (Tcl_CmdProc *) plExitCmd,
        (ClientData) NULL, (Tcl_CmdDeleteProc *) NULL );

    Tcl_CreateCommand( interp, "pr_prompt", (Tcl_CmdProc *) prPromptCmd,
        (ClientData) NULL, (Tcl_CmdDeleteProc *) NULL );

// Custom prompt, to make sure we are in text mode when entering commands

    Tcl_SetVar( interp, "tcl_prompt1", "pr_prompt", 0 );

    return TCL_OK;
}
