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annotate scripts/help/lookfor.m @ 8861:31f864877246

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doc and lookfor fixes
author John W. Eaton <jwe@octave.org>
date Tue, 24 Feb 2009 15:08:39 -0500
parents e0fbf17a17bb
children 3149112b9412
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1 ## Copyright (C) 2009 S�ren Hauberg
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2 ##
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3 ## This program is free software; you can redistribute it and/or modify it
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4 ## under the terms of the GNU General Public License as published by
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5 ## the Free Software Foundation; either version 3 of the License, or (at
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6 ## 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, but
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9 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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11 ## 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; see the file COPYING. If not, see
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15 ## <http://www.gnu.org/licenses/>.
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16
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17 ## -*- texinfo -*-
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18 ## @deftypefn {Command} lookfor @var{str}
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19 ## @deftypefnx {Command} lookfor -all @var{str}
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20 ## @deftypefnx {Function} {[@var{fun}, @var{helpstring}] = } lookfor (@var{str})
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21 ## @deftypefnx {Function} {[@var{fun}, @var{helpstring}] = } lookfor ('-all', @var{str})
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22 ## Search for the string @var{str} in all of the functions found in the
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23 ## function search path. By default @code{lookfor} searches for @var{str}
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24 ## in the first sentence of the help string of each function found. The entire
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25 ## help string of each function found in the path can be searched if
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26 ## the '-all' argument is supplied. All searches are case insensitive.
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27 ##
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28 ## Called with no output arguments, @code{lookfor} prints the list of matching
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29 ## functions to the terminal. Otherwise the output arguments @var{fun} and
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30 ## @var{helpstring} define the matching functions and the first sentence of
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31 ## each of their help strings.
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32 ##
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33 ## Note that the ability of @code{lookfor} to correctly identify the first
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34 ## sentence of the help of the functions is dependent on the format of the
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35 ## functions help. All of the functions in Octave itself will correctly
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36 ## find the first sentence, but the same can not be guaranteed for other
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37 ## functions. Therefore the use of the '-all' argument might be necessary
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38 ## to find related functions that are not part of Octave.
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39 ## @seealso{help, which}
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40 ## @end deftypefn
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41
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42 function [out_fun, out_help_text] = lookfor (str, extra)
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43 if (strcmpi (str, "-all"))
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44 ## The difference between using '-all' and not, is which part of the caches
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45 ## we search. The cache is organised such that its first column contains
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46 ## the function name, its second column contains the full help text, and its
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47 ## third column contains the first sentence of the help text.
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48 str = extra;
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49 search_type = 2; # when using caches, search its second column
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50 else
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51 search_type = 3; # when using caches, search its third column
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52 endif
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53 str = lower (str);
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54
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55 ## Search functions, operators, and keywords that come with Octave
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56 cache_file = doc_cache_file ();
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57 if (exist (cache_file, "file"))
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58 [fun, help_text] = search_cache (str, cache_file, search_type);
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59 had_core_cache = true;
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60 else
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61 fun = help_text = {};
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62 had_core_cache = false;
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63 endif
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64
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65 ## Search functions in path
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66 pathorig = __pathorig__ ();
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67 p = path ();
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68 idx = find (p == pathsep ());
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69 prev_idx = 1;
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70 for n = 1:length (idx)
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71 f = p (prev_idx:idx (n)-1);
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72
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73 ## Should we search the directory or has it been covered by the cache?
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74 if (!had_core_cache || isempty (findstr (f, pathorig)))
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75 cache_file = fullfile (f, "DOC");
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76 if (exist (cache_file, "file"))
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77 ## We have a cache in the directory, then read it and search it!
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78 [funs, hts] = search_cache (str, cache_file, search_type);
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79 fun (end+1:end+length (funs)) = funs;
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80 help_text (end+1:end+length (hts)) = hts;
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81 else
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82 ## We don't have a cache. Search files
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83 funs_in_f = __list_functions__ (f);
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84 for m = 1:length (funs_in_f)
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85 fn = funs_in_f {m};
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86
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87 ## Skip files that start with __
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88 if (length (fn) > 2 && strcmp (fn (1:2), "__"))
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89 continue;
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90 endif
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91
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92 ## Extract first sentence
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93 try
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94 first_sentence = get_first_help_sentence (fn);
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95 status = 0;
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96 catch
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97 status = 1;
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98 end_try_catch
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99
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100 if (search_type == 2) # search entire help text
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101 [text, format] = get_help_text (fn);
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102
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103 ## Take action depending on help text format
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104 switch (lower (format))
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105 case "plain text"
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106 status = 0;
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107 case "texinfo"
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108 [text, status] = __makeinfo__ (text, "plain text");
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109 case "html"
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110 [text, status] = strip_html_tags (text);
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111 otherwise
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112 status = 1;
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113 endswitch
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114
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115 elseif (status == 0) # only search the first sentence of the help text
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116 text = first_sentence;
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117 endif
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118
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119 ## Search the help text, if we can
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120 if (status == 0 && !isempty (strfind (text, str)))
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121 fun (end+1) = fn;
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122 help_text (end+1) = first_sentence;
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123 endif
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124 endfor
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125 endif
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126 endif
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127 prev_idx = idx (n) + 1;
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128 endfor
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129
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130 if (nargout == 0)
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131 ## Print the results (FIXME: improve this to make it look better.
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132 indent = 20;
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133 term_width = terminal_size() (2);
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134 desc_width = term_width - indent - 2;
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135 indent_space = repmat (" ", 1, indent);
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136 for k = 1:length (fun)
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137 f = fun {k};
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138 f (end+1:indent) = " ";
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139 printf (f);
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140 desc = strtrim (strrep (help_text {k}, "\n", " "));
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141 ldesc = length (desc);
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142 printf ("%s\n", desc (1:min (desc_width, ldesc)));
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143 for start = desc_width+1:desc_width:ldesc
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144 stop = min (start + desc_width, ldesc);
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145 printf ("%s%s\n", indent_space, strtrim (desc (start:stop)));
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146 endfor
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147 endfor
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148
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149 else
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150 ## Return the results instead of displaying them
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151 out_fun = fun;
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152 out_help_text = help_text;
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153 endif
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154 endfunction
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155
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156 function [funs, help_texts] = search_cache (str, cache_file, search_type)
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157 load (cache_file);
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158 if (! isempty(cache))
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159 tmp = strfind (cache (search_type, :), str);
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160 cache_idx = find (!cellfun ("isempty", tmp));
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161 funs = cache (1, cache_idx);
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162 help_texts = cache (3, cache_idx);
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163 else
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164 funs = help_texts = {};
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165 endif
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166 endfunction
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167