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1 ## Copyright (C) 2005 Soren Hauberg |
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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 Octave; see the file COPYING. If not, write to the Free |
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15 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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16 ## 02110-1301, USA. |
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17 |
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18 ## -*- texinfo -*- |
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19 ## @deftypefn {Command} doc @var{function_name} |
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20 ## Displays documentation for the function @var{function_name}. |
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21 ## For example, if you want to see the documentation for the Octave |
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22 ## random number generator @code{rand}, type |
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23 ## @example |
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24 ## @code{doc rand} |
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25 ## @end example |
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26 ## @seealso{help} |
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27 ## @end deftypefn |
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28 |
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29 ## Author: Soren Hauberg <soren@hauberg.org> |
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30 ## Adapted-by: jwe |
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31 |
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32 ## PKG_ADD: mark_as_command doc |
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33 |
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34 function retval = doc (fname) |
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35 |
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36 if (nargin == 0 || nargin == 1) |
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37 |
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38 ftype = 0; |
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39 |
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40 if (nargin == 1) |
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41 ## Get the directory where the function lives. |
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42 ## FIXME -- maybe we should have a better way of doing this. |
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43 |
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44 if (ischar (fname)) |
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45 ftype = exist (fname); |
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46 else |
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47 error ("doc: expecting argument to be a character string"); |
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48 endif |
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49 else |
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50 fname = ""; |
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51 endif |
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52 |
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53 if (ftype == 2 || ftype == 3) |
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54 ffile = file_in_loadpath (strcat (fname, ".")); |
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55 else |
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56 ffile = ""; |
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57 endif |
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58 |
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59 if (isempty (ffile)) |
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60 info_dir = octave_config_info ("infodir"); |
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61 else |
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62 info_dir = fileparts (ffile); |
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63 endif |
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64 |
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65 ## Determine if a file called doc.info exist in the same |
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66 ## directory as the function. |
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67 |
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68 info_file_name = fullfile (info_dir, "doc.info"); |
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69 |
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70 [stat_info, err] = stat (info_file_name); |
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71 |
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72 if (err < 0) |
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73 info_file_name = info_file (); |
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74 endif |
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75 |
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76 ## FIXME -- don't change the order of the arguments below because |
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77 ## the info-emacs-info script currently expects --directory DIR as |
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78 ## the third and fourth arguments. Someone should fix that. |
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79 |
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80 cmd = sprintf ("\"%s\" --file \"%s\" --directory \"%s\"", |
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81 info_program (), info_file_name, info_dir); |
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82 |
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83 if (! isempty (fname)) |
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84 cmd = sprintf ("%s --index-search %s", cmd, fname); |
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85 endif |
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86 |
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87 status = system (cmd); |
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88 |
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89 if (status == 127) |
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90 warning ("unable to find info program `%s'", info_program ()); |
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91 endif |
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92 |
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93 if (nargout > 0) |
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94 retval = status; |
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95 endif |
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96 |
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97 else |
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98 print_usage (); |
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99 endif |
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100 |
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101 endfunction |
