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1 ## Copyright (C) 2005 Bill Denney |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; if not, write to the Free Software |
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15 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 ## |
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17 ## Based on code Copyright (C) 2000 Etienne Grossmann |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} addpath(dir1, ...) |
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21 ## Prepends @code{dir1}, @code{...} to the current @code{LOADPATH}. |
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22 ## If the directory is already in the path, it will place it where you |
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23 ## specify in the path (defaulting to prepending it). |
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24 ## |
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25 ## @example |
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26 ## addpath(dir1,'-end',dir2,'-begin',dir3,'-END',dir4,'-BEGIN',dir5) |
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27 ## @result{} Prepends dir1, dir3 and dir5 and appends dir2 and dir4. |
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28 ## @end example |
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29 ## |
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30 ## An error will be returned if the string is not a directory, the |
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31 ## directory doesn't exist or you don't have read access to it. |
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32 ## |
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33 ## BUG: This function can't add directories called @code{-end} or |
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34 ## @code{-begin} (case insensitively). |
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35 ## @end deftypefn |
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36 |
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37 ## Author: Etienne Grossmann <etienne@cs.uky.edu> |
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38 ## Modified-By: Bill Denney <bill@givebillmoney.com> |
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39 ## Last modified: June 2005 |
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40 |
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41 ##PKGADD: mark_as_command addpath |
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42 |
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43 function ret = addpath (varargin) |
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44 |
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45 if (nargout > 0) |
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46 path = varargin{1}; |
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47 varargin = varargin(2:end); |
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48 else |
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49 path = LOADPATH; |
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50 endif |
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51 |
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52 dir = ''; |
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53 if (length (varargin) > 0) |
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54 append = 0; |
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55 switch varargin{end} |
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56 case { 0, '0', '-begin', '-BEGIN' } |
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57 varargin = varargin(1:end-1); |
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58 case { 1, '1', '-end', '-END' } |
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59 varargin = varargin(1:end-1); |
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60 append = 1; |
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61 endswitch |
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62 |
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63 ## Avoid duplicates by stripping pre-existing entries |
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64 path = rmpath (path, varargin{:}); |
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65 |
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66 ## Check if the directories are valid |
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67 for arg = 1:length (varargin) |
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68 p = varargin{arg}; |
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69 if (nargout == 0 && ! isempty (p)) |
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70 [s, err, m] = stat (p); |
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71 if (err ~= 0) |
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72 warning ("addpath %s : %s\n", p, m); |
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73 continue; |
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74 elseif (index (s.modestr, "d") != 1) |
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75 warning ("addpath %s : not a directory (mode=%s)\n", p, s.modestr); |
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76 continue; |
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77 elseif ! ((s.modestr(8) == 'r') || ... |
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78 ((getgid == s.gid) && (s.modestr(5) == 'r')) || ... |
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79 ((getuid == s.uid) && (s.modestr(2) == 'r'))) |
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80 warning ("addpath %s : not readable (mode=%s)\n", p, s.modestr); |
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81 continue; |
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82 endif |
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83 endif |
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84 dir = sprintf ("%s:%s", dir, p); |
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85 endfor |
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86 |
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87 ## Add the directories to the current path |
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88 if (! isempty (dir)) |
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89 dir = dir(2:end); |
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90 if (isempty (path) && ! isempty (dir)) |
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91 path = dir; |
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92 else |
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93 if strcmp (path, ':'), path = ''; end |
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94 if append |
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95 path = sprintf ("%s:%s", path, dir); |
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96 else |
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97 path = sprintf ("%s:%s", dir, path); |
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98 endif |
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99 endif |
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100 endif |
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101 endif |
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102 |
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103 if nargout |
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104 ret = path; |
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105 else |
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106 LOADPATH = path; |
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107 endif |
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108 |
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109 endfunction |
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110 |
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111 %!assert(addpath('','hello'),'hello'); |
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112 %!assert(addpath('','hello','world'),'hello:world') |
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113 %!assert(addpath(':','hello'),'hello:'); |
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114 %!assert(addpath(':','hello','-end'),':hello'); |
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115 %!assert(addpath('hello','hello'),'hello'); |
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116 %!assert(addpath('hello','world'),'world:hello') |
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117 %!assert(addpath('hello','world','-end'),'hello:world') |
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118 %!assert(addpath('hello:','world','-end'),'hello::world') |
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119 %!assert(addpath('hello:','hello','world','-end'),':hello:world') |
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120 |
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121 %!assert(addpath('',''),':') |
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122 %!assert(addpath(':',''),':') |
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123 %!assert(addpath('hello',''),':hello') |
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124 %!assert(addpath('hello:world',''),':hello:world') |
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125 %!assert(addpath('hello:world:',''),':hello:world') |
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126 %!assert(addpath('hello::world',''),':hello:world') |
