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## Copyright (C) 2005-2013 Bill Denney
## Copyright (C) 2007-2009 Ben Abbott
##
## 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 {Function File} {@var{val} =} pathdef ()
## Return the default path for Octave.
## The path information is extracted from one of three sources.
## The possible sources, in order of preference, are:
##
## @enumerate
## @item @file{~/.octaverc}
##
## @item @file{<octave-home>/@dots{}/<version>/m/startup/octaverc}
##
## @item Octave's path prior to changes by any octaverc.
## @end enumerate
## @seealso{path, addpath, rmpath, genpath, savepath}
## @end deftypefn
function val = pathdef ()
## Locate the site octaverc file.
pathdir = octave_config_info ("localstartupfiledir");
site_octaverc = fullfile (pathdir, "octaverc");
## Locate the user's ~/.octaverc file.
user_octaverc = fullfile ("~", ".octaverc");
## Extract the specified paths from the site and user octavercs.
site_path = __extractpath__ (site_octaverc);
if (exist (user_octaverc, "file"))
user_path = __extractpath__ (user_octaverc);
else
user_path = "";
endif
## A path definition in the user rcfile has precedence over the site rcfile.
if (! isempty (user_path))
val = user_path;
elseif (! isempty (site_path))
val = site_path;
else
val = __pathorig__ ();
endif
endfunction
## Extact the path information from the script/function @var{file},
## created by @file{savepath.m}. If @var{file} is omitted,
## @file{~/.octaverc} is used. If successful, @code{__extractpath__}
## returns the path specified in @var{file}.
## Author: Ben Abbott <bpabbott@mac.com>
function specifiedpath = __extractpath__ (savefile)
## The majority of this code was borrowed from savepath.m.
## FIXME: is there some way to share the common parts instead of duplicating?
## ANSWER: Yes. Create a private directory and extract this section of code
## and place it there in a new function only visible by pathdef() and
## savepath().
beginstring = "## Begin savepath auto-created section, do not edit";
endstring = "## End savepath auto-created section";
if (nargin == 0)
savefile = tilde_expand ("~/.octaverc");
endif
## Parse the file if it exists to see if we should replace a section
## or create a section.
startline = endline = 0;
filelines = {};
if (exist (savefile) == 2)
[fid, msg] = fopen (savefile, "rt");
if (fid < 0)
error ("__extractpath__: could not open savefile, %s: %s", savefile, msg);
endif
unwind_protect
linenum = 0;
while (ischar (line = fgetl (fid)))
filelines{++linenum} = line;
## find the first and last lines if they exist in the file
if (strcmp (line, beginstring))
startline = linenum;
elseif (strcmp (line, endstring))
endline = linenum;
endif
endwhile
unwind_protect_cleanup
closeread = fclose (fid);
if (closeread < 0)
error ("__extractpath__: could not close savefile after reading, %s",
savefile);
endif
end_unwind_protect
endif
## Extract the path specifiation.
if (startline > endline || (startline > 0 && endline == 0))
error ("__extractpath__: unable to parse file, %s", savefile);
elseif (startline > 0)
## Undo doubling of single quote characters performed by savepath.
specifiedpath = strrep (regexprep (cstrcat (filelines(startline:endline){:}),
" *path *\\('(.*)'\\); *", "$1"),
"''", "'");
else
specifiedpath = "";
endif
endfunction
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