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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 (@var{dir1}, @dots{}) |
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21 ## Prepend @var{dir1}, @dots{} to the current @code{LOADPATH}. |
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22 ## If the directory is already in the path, it is moved to the specified |
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23 ## location, prepending by default. |
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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{} Prepend dir1, dir3 and dir5 and append 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 @samp{-end} or |
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34 ## @samp{-begin} (case insensitively). |
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35 ## |
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36 ## @seealso{LOADPATH, rmpath, savepath, setpath} |
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37 ## @end deftypefn |
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38 |
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39 ## Author: Etienne Grossmann <etienne@cs.uky.edu> |
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40 ## Modified-By: Bill Denney <bill@givebillmoney.com> |
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41 |
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42 ## PKGADD: mark_as_command addpath |
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43 |
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44 function ret = addpath (varargin) |
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45 |
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46 if (nargout > 0) |
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47 path = varargin{1}; |
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48 varargin = varargin(2:end); |
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49 else |
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50 path = LOADPATH; |
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51 endif |
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52 |
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53 dir = ""; |
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54 if (length (varargin) > 0) |
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55 append = 0; |
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56 switch varargin{end} |
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57 case { 0, "0", "-begin", "-BEGIN" } |
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58 varargin = varargin(1:end-1); |
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59 case { 1, "1", "-end", "-END" } |
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60 varargin = varargin(1:end-1); |
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61 append = 1; |
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62 endswitch |
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63 |
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64 psep = pathsep(); |
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65 |
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66 ## Avoid duplicates by stripping pre-existing entries |
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67 path = rmpath (path, varargin{:}); |
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68 |
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69 ## Check if the directories are valid |
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70 for arg = 1:length (varargin) |
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71 p = varargin{arg}; |
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72 if (nargout == 0 && ! isempty (p)) |
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73 [s, err, m] = stat (p); |
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74 if (err != 0) |
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75 warning ("addpath %s : %s\n", p, m); |
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76 continue; |
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77 elseif (index (s.modestr, "d") != 1) |
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78 warning ("addpath %s : not a directory (mode=%s)\n", p, s.modestr); |
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79 continue; |
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80 elseif (! (s.modestr(8) == "r" |
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81 || (getgid == s.gid && s.modestr(5) == "r") |
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82 || (getuid == s.uid && s.modestr(2) == "r"))) |
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83 warning ("addpath %s : not readable (mode=%s)\n", p, s.modestr); |
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84 continue; |
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85 endif |
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86 endif |
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87 dir = sprintf ("%s%s%s", dir, psep, p); |
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88 endfor |
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89 |
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90 ## Add the directories to the current path |
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91 if (! isempty (dir)) |
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92 dir = dir(2:end); |
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93 if (isempty (path) && ! isempty (dir)) |
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94 path = dir; |
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95 else |
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96 if strcmp (path, psep), path = ""; end |
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97 if append |
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98 path = sprintf ("%s%s%s", path, psep, dir); |
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99 else |
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100 path = sprintf ("%s%s%s", dir, psep, path); |
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101 endif |
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102 endif |
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103 endif |
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104 endif |
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105 |
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106 if nargout |
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107 ret = path; |
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108 else |
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109 LOADPATH = path; |
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110 endif |
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111 |
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112 endfunction |
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113 |
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114 %!assert(addpath('','hello'),'hello'); |
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115 %!assert(addpath('','hello','world'),['hello',pathsep(),'world']) |
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116 %!assert(addpath(pathsep(),'hello'),['hello',pathsep()]); |
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117 %!assert(addpath(pathsep(),'hello','-end'),[pathsep(),'hello']); |
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118 %!assert(addpath('hello','hello'),'hello'); |
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119 %!assert(addpath('hello','world'),['world',pathsep(),'hello']) |
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120 %!assert(addpath('hello','world','-end'),['hello',pathsep(),'world']) |
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121 %!assert(addpath(['hello',pathsep()],'world','-end'),['hello',pathsep(),pathsep(),'world']) |
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122 %!assert(addpath(['hello',pathsep()],'hello','world','-end'),[pathsep(),'hello',pathsep(),'world']) |
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123 |
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124 %!assert(addpath('',''),pathsep()) |
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125 %!assert(addpath(pathsep(),''),pathsep()) |
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126 %!assert(addpath('hello',''),[pathsep(),'hello']) |
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127 %!assert(addpath(['hello',pathsep(),'world'],''),[pathsep(),'hello',pathsep(),'world']) |
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128 %!assert(addpath(['hello',pathsep(),'world',pathsep()],''),[pathsep(),'hello',pathsep(),'world']) |
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129 %!assert(addpath(['hello',pathsep(),pathsep(),'world'],''),[pathsep(),'hello',pathsep(),'world']) |
