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## Copyright (C) 2009-2013 Søren Hauberg
##
## 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/>.
## -*- texinfo -*-
## @deftypefn {Command} {} help @var{name}
## @deftypefnx {Command} {} help @code{--list}
## @deftypefnx {Command} {} help @code{.}
## Display the help text for @var{name}. For example, the command
## @kbd{help help} prints a short message describing the @code{help}
## command.
##
## Given the single argument @code{--list}, list all operators,
## keywords, built-in functions, and loadable functions available
## in the current session of Octave.
##
## Given the single argument @code{.}, list all operators available
## in the current session of Octave.
##
## If invoked without any arguments, @code{help} display instructions
## on how to access help from the command line.
##
## The help command can give you information about operators, but not the
## comma and semicolons that are used as command separators. To get help
## for those, you must type @kbd{help comma} or @kbd{help semicolon}.
## @seealso{doc, lookfor, which}
## @end deftypefn
function retval = help (name)
if (nargin == 0)
text = "\n\
For help with individual commands and functions type\n\
\n\
help NAME\n\
\n\
(replace NAME with the name of the command or function you would\n\
like to learn more about).\n\
\n\
For a more detailed introduction to GNU Octave, please consult the\n\
manual. To read the manual from the prompt type\n\
\n\
doc\n\
\n\
GNU Octave is supported and developed by its user community.\n\
For more information visit http://www.octave.org.\n\n";
if (nargout == 0)
puts (text);
else
retval = text;
endif
elseif (nargin == 1 && ischar (name))
if (strcmp (name, "--list"))
tmp = do_list_functions ();
if (nargout == 0)
printf ("%s", tmp);
else
retval = tmp;
endif
return;
endif
if (strcmp (name, "."))
tmp = do_list_operators ();
if (nargout == 0)
printf ("%s", tmp);
else
retval = tmp;
endif
return;
endif
## Get help text
[text, format] = get_help_text (name);
## Take action depending on help text format
switch (lower (format))
case "plain text"
status = 0;
case "texinfo"
[text, status] = __makeinfo__ (text, "plain text");
case "html"
[text, status] = strip_html_tags (text);
case "not documented"
error ("help: '%s' is not documented\n", name);
case "not found"
do_contents (name);
return;
otherwise
error ("help: internal error: unsupported help text format: '%s'\n", format);
endswitch
## Print text
if (status != 0)
warning ("help: Texinfo formatting filter exited abnormally; raw Texinfo source of help text follows...\n");
endif
if (nargout == 0)
which (name);
printf ("\n%s\n%s", text, __additional_help_message__ ());
else
retval = text;
endif
else
error ("help: invalid input\n");
endif
endfunction
function retval = do_list_operators ()
retval = sprintf ("*** operators:\n\n%s\n\n",
list_in_columns (__operators__ ()));
endfunction
function retval = do_list_functions ()
operators = do_list_operators ();
keywords = sprintf ("*** keywords:\n\n%s\n\n",
list_in_columns (__keywords__ ()));
builtins = sprintf ("*** builtins:\n\n%s\n\n",
list_in_columns (__builtins__ ()));
dirs = ostrsplit (path, pathsep);
flist = "";
for i = 2:numel (dirs)
files = sort ({dir(fullfile (dirs{i}, "*.m")).name, ...
dir(fullfile (dirs{i}, "*.oct")).name, ...
dir(fullfile (dirs{i}, "*.mex")).name});
if (! isempty (files))
flist = sprintf ("%s*** functions in %s:\n\n%s\n\n",
flist, dirs{i}, list_in_columns (files));
endif
endfor
retval = [operators, keywords, builtins, flist];
endfunction
function do_contents (name)
found = false;
dlist = find_dir_in_path (name, "all");
for i = 1:numel (dlist)
fname = make_absolute_filename (fullfile (dlist{i}, "Contents.m"));
[text, format] = get_help_text_from_file (fname);
## Take action depending on help text format
switch (lower (format))
case "plain text"
status = 0;
case "texinfo"
[text, status] = __makeinfo__ (text, "plain text");
case "html"
[text, status] = strip_html_tags (text);
endswitch
if (! isempty (text))
found = true;
## Print text.
if (status != 0)
warning ("help: Texinfo formatting filter exited abnormally; raw Texinfo source of help text follows...\n");
endif
printf ("%s:\n\n%s\n", fname, text);
endif
endfor
if (found)
puts (__additional_help_message__ ());
else
msg = feval (missing_function_hook, name);
if (isempty (msg))
msg = sprintf ("'%s' not found", name);
endif
error ("help: %s\n", msg);
endif
endfunction
%!assert (! isempty (strfind (help ("ls"), "List directory contents")))
%!error <invalid input> help (42)
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