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## Copyright (C) 2005-2013 Bill Denney
##
## 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} {} savepath ()
## @deftypefnx {Function File} {} savepath (@var{file})
## @deftypefnx {Function File} {@var{status} =} savepath (@dots{})
## Save the unique portion of the current function search path that is
## not set during Octave's initialization process to @var{file}.
## If @var{file} is omitted, @file{~/.octaverc} is used. If successful,
## @code{savepath} returns 0.
## @seealso{path, addpath, rmpath, genpath, pathdef}
## @end deftypefn
## Author: Bill Denney <bill@givebillmoney.com>
function retval = savepath (file)
ret = 1;
beginstring = "## Begin savepath auto-created section, do not edit";
endstring = "## End savepath auto-created section";
if (nargin == 0)
file = fullfile ("~", ".octaverc");
endif
## parse the file if it exists to see if we should replace an
## existing section or create a new section
startline = endline = 0;
filelines = {};
if (exist (file) == 2)
[fid, msg] = fopen (file, "rt");
if (fid < 0)
error ("savepath: could not open file, %s: %s", file, 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 ("savepath: could not close file after reading, %s", file);
endif
end_unwind_protect
endif
if (startline > endline || (startline > 0 && endline == 0))
error ("savepath: unable to parse file, %s", file);
endif
## put the current savepath lines into the file
if (isempty (filelines)
|| (startline == 1 && endline == length (filelines)))
## savepath is the entire file
pre = post = {};
elseif (endline == 0)
## drop the savepath statements at the end of the file
pre = filelines;
post = {};
elseif (startline == 1)
pre = {};
post = filelines(endline+1:end);
elseif (endline == length (filelines))
pre = filelines(1:startline-1);
post = {};
else
## insert in the middle
pre = filelines(1:startline-1);
post = filelines(endline+1:end);
endif
## write the results
[fid, msg] = fopen (file, "wt");
if (fid < 0)
error ("savepath: unable to open file for writing, %s, %s", file, msg);
endif
unwind_protect
for i = 1:length (pre)
fprintf (fid, "%s\n", pre{i});
endfor
## Remove the portion of the path defined via the command line
## and/or the environment.
workingpath = parsepath (path);
command_line_path = parsepath (command_line_path ());
octave_path = parsepath (getenv ("OCTAVE_PATH"));
pathdef = pathdef ();
if (isempty (pathdef))
## This occurs when running octave via run-octave. In this instance
## the entire path is specified via the command line and pathdef()
## is empty.
[~, n] = setdiff (workingpath, octave_path);
default_path = command_line_path;
else
[~, n] = setdiff (workingpath, union (command_line_path, octave_path));
default_path = parsepath (pathdef);
endif
## This is the path we'd like to preserve when octave is run.
path_to_preserve = workingpath (sort (n));
## Determine the path to Octave's user and sytem wide pkgs.
[pkg_user, pkg_system] = pkg ("list");
pkg_user_path = cell (1, numel (pkg_user));
pkg_system_path = cell (1, numel (pkg_system));
for n = 1:numel (pkg_user)
pkg_user_path{n} = pkg_user{n}.archprefix;
endfor
for n = 1:numel (pkg_system)
pkg_system_path{n} = pkg_system{n}.archprefix;
endfor
pkg_path = union (pkg_user_path, pkg_system_path);
## Rely on Octave's initialization to include the pkg path elements.
if (! isempty (pkg_path))
[~, n] = setdiff (path_to_preserve, strcat (pkg_path, ":"));
path_to_preserve = path_to_preserve(sort (n));
endif
## Split the path to be saved into two groups. Those path elements that
## belong at the beginning and those at the end.
if (! isempty (default_path))
n1 = find (strcmp (default_path{1}, path_to_preserve));
n2 = find (strcmp (default_path{end}, path_to_preserve));
n_middle = round (0.5*(n1+n2));
[~, n] = setdiff (path_to_preserve, default_path);
path_to_save = path_to_preserve(sort (n));
## Remove pwd
path_to_save = path_to_save(! strcmp (path_to_save, ["." pathsep]));
n = ones (size (path_to_save));
for m = 1:numel (path_to_save)
n(m) = find (strcmp (path_to_save{m}, path_to_preserve));
endfor
path_to_save_begin = path_to_save(n <= n_middle);
path_to_save_end = path_to_save(n > n_middle);
else
path_to_save_begin = path_to_preserve;
path_to_save_end = {};
endif
path_to_save_begin = cell2mat (path_to_save_begin);
path_to_save_end = cell2mat (path_to_save_end);
## Use single quotes for PATH argument to avoid string escape
## processing. Since we are using single quotes around the arg,
## double any single quote characters found in the string.
fprintf (fid, "%s\n", beginstring);
if (! isempty (path_to_save_begin))
n = find (path_to_save_begin != pathsep, 1, "last");
fprintf (fid, " addpath ('%s', '-begin');\n",
strrep (path_to_save_begin(1:n), "'", "''"));
endif
if (! isempty (path_to_save_end))
n = find (path_to_save_end != pathsep, 1, "last");
fprintf (fid, " addpath ('%s', '-end');\n",
strrep (path_to_save_end(1:n), "'", "''"));
endif
fprintf (fid, "%s\n", endstring);
for i = 1:length (post)
fprintf (fid, "%s\n", post{i});
endfor
unwind_protect_cleanup
closeread = fclose (fid);
if (closeread < 0)
error ("savepath: could not close savefile after writing, %s", file);
elseif (nargin == 0)
warning ("savepath: current path saved to %s", file);
endif
end_unwind_protect
ret = 0;
if (nargout > 0)
retval = ret;
endif
endfunction
function path_elements = parsepath (p)
pat = sprintf ('([^%s]+[%s$])', pathsep, pathsep);
path_elements = regexpi (strcat (p, pathsep), pat, "match");
endfunction
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