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octave.cc

/*

Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
              2002, 2003, 2004, 2005, 2006, 2007 John W. Eaton

This file is part of Octave.

Octave 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 3 of the License, or (at your
option) any later version.

Octave 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 Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

// Born February 20, 1992.

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <cassert>
#include <cstdlib>
#include <cstring>
#include <ctime>

#include <fstream>
#include <iostream>

#ifdef HAVE_UNISTD_H
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <unistd.h>
#endif

#include "cmd-edit.h"
#include "f77-fcn.h"
#include "file-ops.h"
#include "file-stat.h"
#include "lo-error.h"
#include "oct-env.h"
#include "pathsearch.h"
#include "str-vec.h"

#include <defaults.h>
#include "Cell.h"
#include "defun.h"
#include "error.h"
#include "file-io.h"
#include "input.h"
#include "lex.h"
#include "load-path.h"
#include "octave.h"
#include "oct-hist.h"
#include "oct-map.h"
#include "oct-obj.h"
#include "ops.h"
#include "toplev.h"
#include "parse.h"
#include "procstream.h"
#include "prog-args.h"
#include "sighandlers.h"
#include "sysdep.h"
#include "ov.h"
#include "unwind-prot.h"
#include "utils.h"
#include "variables.h"
#include <version.h>

// Kluge.
extern "C" F77_RET_T
F77_FUNC (xerbla, XERBLA) (F77_CONST_CHAR_ARG_DECL, const octave_idx_type&
                     F77_CHAR_ARG_LEN_DECL);

extern void install_builtins (void);

#if !defined (HAVE_ATEXIT) && defined (HAVE_ON_EXIT)
extern "C" int on_exit ();
#define atexit on_exit
#endif

// The command-line options.
static string_vector octave_argv;

// The name used to invoke Octave.
static std::string
octave_program_invocation_name;

// The last component of octave_program_invocation_name.
static std::string octave_program_name;

// TRUE means we read ~/.octaverc and ./.octaverc.
// (--norc; --no-init-file; -f)
static bool read_init_files = true;

// TRUE means we read the site-wide octaverc files.
// (--norc; --no-site-file; -f)
static bool read_site_files = true;

// TRUE means we set the initial path to configured defaults.
// (--no-initial-path)
static bool set_initial_path = true;

// TRUE means we don't print the usual startup message.
// (--quiet; --silent; -q)
static bool inhibit_startup_message = false;

// TRUE means we turn on compatibility options.
// (--traditional)
static bool traditional = false;

// If TRUE, print verbose info in some cases.
// (--verbose; -V)
static bool verbose_flag = false;

// Usage message
static const char *usage_string = 
  "octave [-?HVdfhiqvx] [--debug] [--echo-commands] [--eval CODE]\n\
       [--exec-path path] [--help] [--image-path path] [--info-file file]\n\
       [--info-program prog] [--interactive] [--line-editing] [--no-history] [--no-init-file]\n\
       [--no-line-editing] [--no-site-file] [--no-init-path] [-p path]\n\
       [--path path] [--silent] [--traditional] [--verbose] [--version] [file]";

// This is here so that it's more likely that the usage message and
// the real set of options will agree.  Note: the `+' must come first
// to prevent getopt from permuting arguments!
static const char *short_opts = "+?HVdfhip:qvx";

// The code to evaluate at startup (--eval CODE)
static std::string code_to_eval;

// If TRUE, don't exit after evaluating code given by --eval option.
static bool persist = false;

// Long options.  See the comments in getopt.h for the meanings of the
// fields in this structure.
#define EVAL_OPTION 1
#define EXEC_PATH_OPTION 2
#define IMAGE_PATH_OPTION 3
#define INFO_FILE_OPTION 4
#define INFO_PROG_OPTION 5
#define NO_INIT_FILE_OPTION 6
#define NO_LINE_EDITING_OPTION 7
#define NO_SITE_FILE_OPTION 8
#define NO_INITIAL_PATH_OPTION 9
#define PERSIST_OPTION 10
#define TRADITIONAL_OPTION 11
#define LINE_EDITING_OPTION 12
long_options long_opts[] =
  {
    { "debug",            prog_args::no_arg,       0, 'd' },
    { "braindead",        prog_args::no_arg,       0, TRADITIONAL_OPTION },
    { "echo-commands",    prog_args::no_arg,       0, 'x' },
    { "eval",             prog_args::required_arg, 0, EVAL_OPTION },
    { "exec-path",        prog_args::required_arg, 0, EXEC_PATH_OPTION },
    { "help",             prog_args::no_arg,       0, 'h' },
    { "image-path",       prog_args::required_arg, 0, IMAGE_PATH_OPTION },
    { "info-file",        prog_args::required_arg, 0, INFO_FILE_OPTION },
    { "info-program",     prog_args::required_arg, 0, INFO_PROG_OPTION },
    { "interactive",      prog_args::no_arg,       0, 'i' },
    { "line-editing",     prog_args::no_arg,       0, LINE_EDITING_OPTION },
    { "no-history",       prog_args::no_arg,       0, 'H' },
    { "no-init-file",     prog_args::no_arg,       0, NO_INIT_FILE_OPTION },
    { "no-line-editing",  prog_args::no_arg,       0, NO_LINE_EDITING_OPTION },
    { "no-site-file",     prog_args::no_arg,       0, NO_SITE_FILE_OPTION },
    { "no-initial-path",  prog_args::no_arg,       0, NO_INITIAL_PATH_OPTION },
    { "norc",             prog_args::no_arg,       0, 'f' },
    { "path",             prog_args::required_arg, 0, 'p' },
    { "persist",          prog_args::no_arg,       0, PERSIST_OPTION },
    { "quiet",            prog_args::no_arg,       0, 'q' },
    { "silent",           prog_args::no_arg,       0, 'q' },
    { "traditional",      prog_args::no_arg,       0, TRADITIONAL_OPTION },
    { "verbose",          prog_args::no_arg,       0, 'V' },
    { "version",          prog_args::no_arg,       0, 'v' },
    { 0,                  0,                       0, 0 }
  };

// Store the command-line options for later use.

static void
intern_argv (int argc, char **argv)
{
  symbol_record *nargin_sr = top_level_sym_tab->lookup ("__nargin__", true);

  nargin_sr->mark_as_static ();

  nargin_sr->define (argc-1);

  if (argc > 1)
    {
      octave_argv.resize (argc-1);

      // Skip program name in argv.
      int i = argc;
      while (--i > 0)
      octave_argv[i-1] = *(argv+i);
    }
}

static void
initialize_pathsearch (void)
{
  // This may seem odd, but doing it this way means that we don't have
  // to modify the kpathsea library...

  std::string odb = octave_env::getenv ("OCTAVE_DB_PATH");

  // For backward compatibility.

  if (odb.empty ())
    odb = octave_env::getenv ("OCTAVE_DB_DIR");

  if (odb.empty ())
    odb = Vdata_dir + file_ops::dir_sep_str + "octave:"
      + Vlibexec_dir + file_ops::dir_sep_str + "octave";
}

DEFUN (__version_info__, args, ,
  "-*- texinfo -*-\n\
@deftypefn {Built-in Function} {retval =} __version_info__ (@var{name}, @var{version}, @var{release}, @var{date})\n\
Undocumented internal function.\n\
@end deftypefn")
{
  octave_value retval;

  static Octave_map vinfo;

  int nargin = args.length ();

  if (nargin == 4)
    {
      if (vinfo.nfields () == 0)
      {
        vinfo.assign ("Name", args (0));
        vinfo.assign ("Version", args (1));
        vinfo.assign ("Release", args (2));
        vinfo.assign ("Date", args (3));
      }
      else
      {
        octave_idx_type n = vinfo.numel () + 1;

        vinfo.resize (dim_vector (n, 1));

        octave_value idx (n);

        vinfo.assign (idx, "Name", Cell (octave_value (args (0))));
        vinfo.assign (idx, "Version", Cell (octave_value (args (1))));
        vinfo.assign (idx, "Release", Cell (octave_value (args (2))));
        vinfo.assign (idx, "Date", Cell (octave_value (args (3))));
      }
    }
  else if (nargin == 0)
    retval = vinfo;
  else
    print_usage ();

  return retval;
}

static void
initialize_version_info (void)
{
  octave_value_list args;

  args(3) = OCTAVE_RELEASE_DATE;
  args(2) = OCTAVE_RELEASE;
  args(1) = OCTAVE_VERSION;
  args(0) = "GNU Octave";

  F__version_info__ (args, 0);
}

// Initialize by reading startup files.

static void
execute_startup_files (void)
{
  unwind_protect::begin_frame ("execute_startup_files");

  unwind_protect_bool (input_from_startup_file);

  input_from_startup_file = true;

  int verbose = (verbose_flag && ! inhibit_startup_message);

  if (read_site_files)
    {
      // Execute commands from the site-wide configuration file.
      // First from the file $(prefix)/lib/octave/site/m/octaverc
      // (if it exists), then from the file
      // $(prefix)/share/octave/$(version)/m/octaverc (if it exists).

      parse_and_execute (Vlocal_site_defaults_file, verbose);

      parse_and_execute (Vsite_defaults_file, verbose);
    }

  if (read_init_files)
    {
      // Try to execute commands from $HOME/$OCTAVE_INITFILE and
      // $OCTAVE_INITFILE.  If $OCTAVE_INITFILE is not set, .octaverc
      // is assumed.

      bool home_rc_already_executed = false;

      std::string initfile = octave_env::getenv ("OCTAVE_INITFILE");

      if (initfile.empty ())
      initfile = ".octaverc";

      std::string home_dir = octave_env::get_home_directory ();

      std::string home_rc = octave_env::make_absolute (initfile, home_dir);

      std::string local_rc;

      if (! home_rc.empty ())
      {
        parse_and_execute (home_rc, verbose);

        // Names alone are not enough.

        file_stat fs_home_rc (home_rc);

        if (fs_home_rc)
          {
            // We want to check for curr_dir after executing home_rc
            // because doing that may change the working directory.

            std::string curr_dir = octave_env::getcwd ();

            local_rc = octave_env::make_absolute (initfile, curr_dir);

            home_rc_already_executed = same_file (home_rc, local_rc);
          }
      }

      if (! home_rc_already_executed)
      {
        if (local_rc.empty ())
          {
            std::string curr_dir = octave_env::getcwd ();

            local_rc = octave_env::make_absolute (initfile, curr_dir);
          }

        parse_and_execute (local_rc, verbose);
      }
    }

  unwind_protect::run_frame ("execute_startup_files");
}

static int
execute_eval_option_code (const std::string& code)
{
  unwind_protect::begin_frame ("execute_eval_option_code");

  octave_save_signal_mask ();

  can_interrupt = true;

  octave_signal_hook = octave_signal_handler;
  octave_interrupt_hook = unwind_protect::run_all;
  octave_bad_alloc_hook = unwind_protect::run_all;

  octave_catch_interrupts ();

  octave_initialized = true;

  unwind_protect_bool (interactive);

  interactive = false;

  int parse_status = 0;

  try
    {
      eval_string (code, false, parse_status, 0);
    }
  catch (octave_interrupt_exception)
    {
      recover_from_exception ();
      octave_stdout << "\n";
    }
  catch (std::bad_alloc)
    {
      std::cerr << "error: memory exhausted or requested size too large for range of Octave's index type -- eval failed"
            << std::endl;
    }

  unwind_protect::run_frame ("execute_eval_option_code");

  return parse_status;
}

static void
execute_command_line_file (const std::string& fname)
{
  unwind_protect::begin_frame ("execute_command_line_file");

  octave_save_signal_mask ();

  can_interrupt = true;

  octave_signal_hook = octave_signal_handler;
  octave_interrupt_hook = unwind_protect::run_all;
  octave_bad_alloc_hook = unwind_protect::run_all;

  octave_catch_interrupts ();

  octave_initialized = true;

  unwind_protect_bool (interactive);
  unwind_protect_bool (reading_script_file);
  unwind_protect_bool (input_from_command_line_file);

  unwind_protect_str (curr_fcn_file_name);
  unwind_protect_str (curr_fcn_file_full_name);

  unwind_protect_str (octave_program_invocation_name);
  unwind_protect_str (octave_program_name);

  interactive = false;
  reading_script_file = true;
  input_from_command_line_file = true;

  curr_fcn_file_name = fname;
  curr_fcn_file_full_name = curr_fcn_file_name;

  octave_program_invocation_name = curr_fcn_file_name;

  size_t pos = curr_fcn_file_name.find_last_of (file_ops::dir_sep_chars);
  
  std::string tmp = (pos != NPOS)
    ? curr_fcn_file_name.substr (pos+1) : curr_fcn_file_name;

  octave_program_name = tmp;

  try
    {
      parse_and_execute (fname, false, "octave");
    }
  catch (octave_interrupt_exception)
    {
      recover_from_exception ();
      octave_stdout << "\n";
    }
  catch (std::bad_alloc)
    {
      std::cerr << "error: memory exhausted or requested size too large for range of Octave's index type -- execution of "
            << fname << " failed" << std::endl;
    }
 
  unwind_protect::run_frame ("execute_command_line_file");
}

// Usage message with extra help.

static void
verbose_usage (void)
{
  std::cout << OCTAVE_NAME_VERSION_COPYRIGHT_COPYING_AND_WARRANTY "\n\
\n\
Usage: octave [options]\n\
\n\
Options:\n\
\n\
  --debug, -d             Enter parser debugging mode.\n\
  --echo-commands, -x     Echo commands as they are executed.\n\
  --eval CODE             Evaluate CODE.  Exit when done unless --persist.\n\
  --exec-path PATH        Set path for executing subprograms.\n\
  --help, -h, -?          Print short help message and exit.\n\
  --image-path PATH       Set initial IMAGE_PATH to PATH.\n\
  --info-file FILE        Use top-level info file FILE.\n\
  --info-program PROGRAM  Use PROGRAM for reading info files.\n\
  --interactive, -i       Force interactive behavior.\n\
  --line-editing          Force readline use for command-line editing.\n\
  --no-history, -H        Don't save commands to the history list\n\
  --no-init-file          Don't read the ~/.octaverc or .octaverc files.\n\
  --no-line-editing       Don't use readline for command-line editing.\n\
  --no-site-file          Don't read the site-wide octaverc file.\n\
  --norc, -f              Don't read any initialization files.\n\
  --path PATH, -p PATH    Set initial function search path to PATH.\n\
  --persist               Go interactive after --eval or reading from FILE.\n\
  --silent, -q            Don't print message at startup.\n\
  --traditional           Set compatibility variables.\n\
  --verbose, -V           Enable verbose output in some cases.\n\
  --version, -v           Print version number and exit.\n\
\n\
  FILE                    Execute commands from FILE.  Exit when done\n\
                          unless --persist is also specified.\n\
\n"
OCTAVE_WWW_STATEMENT "\n\
\n"
OCTAVE_CONTRIB_STATEMENT "\n\
\n"
OCTAVE_BUGS_STATEMENT "\n";

  exit (0);
}

// Terse usage messsage.

static void
usage (void)
{
  std::cerr << "usage: " << usage_string << "\n";
  exit (1);
}

static void
print_version_and_exit (void)
{
  std::cout << OCTAVE_NAME_VERSION_COPYRIGHT_COPYING_WARRANTY_AND_BUGS "\n";
  exit (0);
}

static void
initialize_error_handlers ()
{
  set_liboctave_error_handler (error);
  set_liboctave_warning_handler (warning);
  set_liboctave_warning_with_id_handler (warning_with_id);
}

// What happens on --traditional.

static void
maximum_braindamage (void)
{
  persist = true;

  bind_internal_variable ("PS1", ">> ");
  bind_internal_variable ("PS2", "");
  bind_internal_variable ("beep_on_error", true);
  bind_internal_variable ("crash_dumps_octave_core", false);
  bind_internal_variable ("default_save_options", "-mat-binary");
  bind_internal_variable ("fixed_point_format", true);
  bind_internal_variable ("history_timestamp_format_string",
                   "%%-- %D %I:%M %p --%%");
  bind_internal_variable ("page_screen_output", false);
  bind_internal_variable ("print_empty_dimensions", false);

  disable_warning ("Octave:fopen-file-in-path");
  disable_warning ("Octave:function-name-clash");
  disable_warning ("Octave:load-file-in-path");
}

// You guessed it.

int
octave_main (int argc, char **argv, int embedded)
{
  octave_env::set_program_name (argv[0]);

  octave_program_invocation_name = octave_env::get_program_invocation_name ();
  octave_program_name = octave_env::get_program_name ();

  // The order of these calls is important.  The call to
  // install_defaults must come before install_builtins because
  // default variable values must be available for the variables to be
  // installed, and the call to install_builtins must come before the
  // options are processed because some command line options override
  // defaults by calling bind_internal_variable.

  init_signals ();

  sysdep_init ();

  // The idea here is to force xerbla to be referenced so that we will
  // link to our own version instead of the one provided by the BLAS
  // library.  But octave_NaN should never be -1, so we should never
  // actually call xerbla.

  if (octave_NaN == -1)
    F77_FUNC (xerbla, XERBLA) ("octave", 13, 6L);

  initialize_error_handlers ();

  initialize_default_warning_state ();

  install_defaults ();

  initialize_pathsearch ();

  if (! embedded)
    install_signal_handlers ();

  initialize_file_io ();

  initialize_symbol_tables ();

  install_types ();

  install_ops ();

  install_builtins ();

  prog_args args (argc, argv, short_opts, long_opts);

  bool forced_line_editing = false;

  int optc;
  while ((optc = args.getopt ()) != EOF)
    {
      switch (optc)
      {
      case 'H':
        bind_internal_variable ("saving_history", false);
        break;

      case 'V':
        verbose_flag = true;
        break;

      case 'd':
        // This is the same as yydebug in parse.y.
        octave_debug++;
        break;

      case 'f':
        read_init_files = false;
        read_site_files = false;
        break;

      case 'h':
      case '?':
        verbose_usage ();
        break;

      case 'i':
        forced_interactive = true;
        break;

      case 'p':
        if (args.optarg ())
          load_path::set_command_line_path (args.optarg ());
        break;

      case 'q':
        inhibit_startup_message = true;
        break;

      case 'x':
        {
          double tmp = (ECHO_SCRIPTS | ECHO_FUNCTIONS | ECHO_CMD_LINE);
          bind_internal_variable ("echo_executing_commands", tmp);
        }
        break;

      case 'v':
        print_version_and_exit ();
        break;

      case EVAL_OPTION:
        if (args.optarg ())
          {
            if (code_to_eval.empty ())
            code_to_eval = args.optarg ();
            else
            code_to_eval += std::string (" ") + args.optarg ();
          }
        break;

      case EXEC_PATH_OPTION:
        if (args.optarg ())
          set_exec_path (args.optarg ());
        break;

      case IMAGE_PATH_OPTION:
        if (args.optarg ())
          set_image_path (args.optarg ());
        break;

      case INFO_FILE_OPTION:
        if (args.optarg ())
          bind_internal_variable ("info_file", args.optarg ());
        break;

      case INFO_PROG_OPTION:
        if (args.optarg ())
          bind_internal_variable ("info_program", args.optarg ());
        break;

        case LINE_EDITING_OPTION:
          forced_line_editing = true;
          break;

      case NO_INIT_FILE_OPTION:
        read_init_files = false;
        break;

      case NO_LINE_EDITING_OPTION:
        line_editing = false;
        break;

      case NO_SITE_FILE_OPTION:
        read_site_files = 0;
        break;

      case NO_INITIAL_PATH_OPTION:
        set_initial_path = false;
        break;

      case TRADITIONAL_OPTION:
        traditional = true;
        break;

      case PERSIST_OPTION:
        persist = true;
        break;

      default:
        usage ();
        break;
      }
    }

#if defined (HAVE_ATEXIT) || defined (HAVE_ON_EXIT)
  // Make sure we clean up when we exit.  Also allow users to register
  // functions.  If we don't have atexit or on_exit, we're going to
  // leave some junk files around if we exit abnormally.

  atexit (do_octave_atexit);
#endif

  // These can come after command line args since none of them set any
  // defaults that might be changed by command line options.

  initialize_command_input ();

  if (! inhibit_startup_message)
    std::cout << OCTAVE_STARTUP_MESSAGE "\n" << std::endl;

  if (traditional)
    maximum_braindamage ();

  octave_interpreter_ready = true;

  initialize_version_info ();

  // Make all command-line arguments available to startup files,
  // including PKG_ADD files.

  intern_argv (argc, argv);

  load_path::initialize (set_initial_path);

  execute_startup_files ();

  initialize_history ();

  if (! inhibit_startup_message && reading_startup_message_printed)
    std::cout << std::endl;

  // Is input coming from a terminal?  If so, we are probably
  // interactive.

  interactive = (! embedded
             && isatty (fileno (stdin)) && isatty (fileno (stdout)));

  if (! interactive && ! forced_line_editing)
    line_editing = false;

  // If there is an extra argument, see if it names a file to read.
  // Additional arguments are taken as command line options for the
  // script.

  int last_arg_idx = args.optind ();

  int remaining_args = argc - last_arg_idx;

  if (! code_to_eval.empty ())
    {
      int parse_status = execute_eval_option_code (code_to_eval);

      if (! (persist || remaining_args > 0))
      clean_up_and_exit (parse_status || error_state ? 1 : 0);
    }

  if (remaining_args > 0)
    {
      // If we are running an executable script (#! /bin/octave) then
      // we should only see the args passed to the script.

      intern_argv (remaining_args, argv+last_arg_idx);

      execute_command_line_file (argv[last_arg_idx]);

      if (! persist)
      clean_up_and_exit (error_state ? 1 : 0);
    }

  // Avoid counting commands executed from startup files.

  command_editor::reset_current_command_number (1);

  // Now argv should have the full set of args.
  intern_argv (argc, argv);

  if (! embedded)
    switch_to_buffer (create_buffer (get_input_from_stdin ()));

  // Force input to be echoed if not really interactive, but the user
  // has forced interactive behavior.

  if (! interactive && forced_interactive)
    {
      command_editor::blink_matching_paren (false);

      // FIXME -- is this the right thing to do?

      bind_internal_variable ("echo_executing_commands", ECHO_CMD_LINE);
    }

  if (embedded)
    {
      // FIXME -- do we need to do any cleanup here before
      // returning?  If we don't, what will happen to Octave functions
      // that have been registered to execute with atexit, for example?

      return 1;
    }

  int retval = main_loop ();

  if (retval == 1 && ! error_state)
    retval = 0;

  clean_up_and_exit (retval);

  return 0;
}

DEFUN (argv, args, ,
  "-*- texinfo -*-\n\
@deftypefn {Built-in Function} {} argv ()\n\
Return the command line arguments passed to Octave.  For example,\n\
if you invoked Octave using the command\n\
\n\
@example\n\
octave --no-line-editing --silent\n\
@end example\n\
\n\
@noindent\n\
@code{argv} would return a cell array of strings with the elements\n\
@code{--no-line-editing} and @code{--silent}.\n\
\n\
If you write an executable Octave script, @code{argv} will return the\n\
list of arguments passed to the script.  @xref{Executable Octave Programs},\n\
for an example of how to create an executable Octave script.\n\
@end deftypefn")
{
  octave_value retval;

  if (args.length () == 0)
    retval = Cell (octave_argv);
  else
    print_usage ();

  return retval;
}

DEFUN (program_invocation_name, args, ,
  "-*- texinfo -*-\n\
@deftypefn {Built-in Function} program_invocation_name ()\n\
Return the name that was typed at the shell prompt to run Octave.\n\
\n\
If executing a script from the command line (e.g., @code{octave foo.m})\n\
or using an executable Octave script, the program name is set to the\n\
name of the script.  @xref{Executable Octave Programs}, for an example of\n\
how to create an executable Octave script.\n\
@seealso{program_name}\n\
@end deftypefn")
{
  octave_value retval;

  if (args.length () == 0)
    retval = octave_program_invocation_name;
  else
    print_usage ();

  return retval;
}

DEFUN (program_name, args, ,
  "-*- texinfo -*-\n\
@deftypefn {Built-in Function} {} program_name ()\n\
Return the last component of of the value returned by\n\
@code{program_invocation_name}.\n\
@seealso{program_invocation_name}\n\
@end deftypefn")
{
  octave_value retval;

  if (args.length () == 0)
    retval = octave_program_name;
  else
    print_usage ();

  return retval;
}

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