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1 ## Copyright (C) 2008 Ben Abbott |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {@var{val} =} pathdef () |
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21 ## Return the default path for Octave. |
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22 ## The path information is extracted from one of three sources. |
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23 ## In order of preference, those are; |
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24 ## |
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25 ## @enumerate |
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26 ## @item @file{~/.octaverc} |
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27 ## @item @file{<octave-home>/.../<version>/m/startup/octaverc} |
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28 ## @item Octave's path prior to changes by any octaverc. |
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29 ## @end enumerate |
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30 ## @seealso{path, addpath, rmpath, genpath, savepath, pathsep} |
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31 ## @end deftypefn |
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32 |
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33 function val = pathdef () |
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34 |
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35 ## Save the path present when called. This will be used to restore |
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36 ## path when done. |
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37 presentpath = path; |
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38 |
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39 ## Use Octave's orignal path as the default default. |
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40 val = __pathorig__; |
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41 |
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42 ## Locate the site octaverc file (is there a better way?). |
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43 prestr = [OCTAVE_HOME, filesep]; |
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44 poststr = [filesep, version, filesep, 'm', filesep', 'startup']; |
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45 ncolon = [0, strfind(presentpath,':'), numel(presentpath)+1]; |
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46 site_octaverc = ''; |
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47 for nc = 1:(numel(ncolon)-1) |
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48 pathdir = presentpath((ncolon(nc)+1):(ncolon(nc+1)-1)); |
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49 npre = strfind (pathdir, prestr); |
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50 npost = strfind (pathdir, poststr); |
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51 if (npre == 1 && |
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52 npost > numel (prestr) && |
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53 npost == numel (pathdir) - numel (poststr)+1) |
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54 site_octaverc = [pathdir, filesep, 'octaverc']; |
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55 break; |
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56 endif |
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57 endfor |
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58 if isempty (site_octaverc) || ~exist (site_octaverc, 'file') |
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59 regexp_octaverc = [prestr, '*', poststr, filesep, 'octaverc']; |
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60 warning (['pathdef: could not locate `',regexp_octaverc,'''.']) |
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61 endif |
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62 |
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63 ## locate the user ~\.octaverc file. |
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64 user_octaverc = tilde_expand ("~/.octaverc"); |
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65 |
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66 ## Extract the specified paths from the site and user octaverc's. |
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67 site_pathscript = __extractpath__ (site_octaverc); |
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68 if exist (user_octaverc, 'file') |
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69 user_pathscript = __extractpath__ (user_octaverc); |
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70 else |
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71 user_pathscript = ''; |
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72 endif |
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73 |
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74 ## A path definition in the user octaverc has precedence over the site |
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75 if numel (user_pathscript) |
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76 try |
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77 eval (user_pathscript); |
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78 val = path; |
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79 catch |
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80 warning (['Path defined in ',user_octaverc,' produced an error']) |
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81 end_try_catch |
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82 elseif numel (site_pathscript) |
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83 try |
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84 eval (site_pathscript); |
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85 val = path; |
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86 catch |
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87 warning (['Path defined in ',site_octaverc,' produced an error']) |
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88 end_try_catch |
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89 endif |
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90 |
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91 ## Restore the path |
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92 path (presentpath); |
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93 |
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94 endfunction |
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95 |
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96 |
