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update copyright notices
author John W. Eaton <jwe@octave.org>
date Fri, 14 Jan 2011 05:47:45 -0500
parents c776f063fefe
children c792872f8942
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1 ## Copyright (C) 2009-2011 S�ren Hauberg
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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 {Command} {} lookfor @var{str}
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21 ## @deftypefnx {Command} {} lookfor -all @var{str}
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22 ## @deftypefnx {Function File} {[@var{func}, @var{helpstring}] =} lookfor (@var{str})
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23 ## @deftypefnx {Function File} {[@var{func}, @var{helpstring}] =} lookfor ('-all', @var{str})
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24 ## Search for the string @var{str} in all functions found in the current
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25 ## function search path. By default, @code{lookfor} searches for @var{str}
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26 ## in the first sentence of the help string of each function found. The entire
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27 ## help text of each function can be searched if the '-all' argument is
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28 ## supplied. All searches are case insensitive.
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29 ##
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30 ## Called with no output arguments, @code{lookfor} prints the list of
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31 ## matching functions to the terminal. Otherwise, the output arguments
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32 ## @var{func} and @var{helpstring} define the matching functions and the
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33 ## first sentence of each of their help strings.
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34 ##
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35 ## The ability of @code{lookfor} to correctly identify the first
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36 ## sentence of the help text is dependent on the format of the
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37 ## function's help. All Octave core functions are correctly
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38 ## formatted, but the same can not be guaranteed for external packages and
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39 ## user-supplied functions. Therefore, the use of the '-all' argument may
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40 ## be necessary to find related functions that are not a part of Octave.
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41 ## @seealso{help, doc, which}
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42 ## @end deftypefn
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43
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44 function [out_fun, out_help_text] = lookfor (str, arg2)
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45 if (strcmpi (str, "-all"))
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46 ## The difference between using '-all' and not, is which part of the caches
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47 ## we search. The cache is organised such that its first column contains
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48 ## the function name, its second column contains the full help text, and its
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49 ## third column contains the first sentence of the help text.
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50 str = arg2;
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51 search_type = 2; # when using caches, search its second column
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52 else
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53 search_type = 3; # when using caches, search its third column
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54 endif
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55 str = lower (str);
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56
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57 ## Search functions, operators, and keywords that come with Octave
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58 cache_file = doc_cache_file ();
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59 if (exist (cache_file, "file"))
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60 [fun, help_text] = search_cache (str, cache_file, search_type);
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61 had_core_cache = true;
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62 else
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63 fun = help_text = {};
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64 had_core_cache = false;
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65 endif
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66
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67 ## Search functions in new path dirs.
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68 orig_path = strsplit (__pathorig__ (), pathsep ());
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69
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70 ## ditto for path.
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71 new_path = strsplit (path (), pathsep ());
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72
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73 ## scratch out directories already covered by orig_path.
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74 if (had_core_cache)
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75 new_path = setdiff (new_path, orig_path);
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76 endif
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77
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78 for n = 1:numel (new_path)
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79 elt = new_path{n};
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80 cache_file = fullfile (elt, "doc-cache");
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81 if (exist (cache_file, "file"))
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82 ## We have a cache in the directory, then read it and search it!
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83 [funs, hts] = search_cache (str, cache_file, search_type);
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84 fun (end+1:end+length (funs)) = funs;
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85 help_text (end+1:end+length (hts)) = hts;
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86 else
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87 ## We don't have a cache. Search files
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88 funs_in_f = __list_functions__ (elt);
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89 for m = 1:length (funs_in_f)
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90 fn = funs_in_f {m};
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91
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92 ## Skip files that start with __
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93 if (length (fn) > 2 && strcmp (fn (1:2), "__"))
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94 continue;
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95 endif
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96
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97 ## Extract first sentence
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98 try
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99 warn_state = warning ();
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100 unwind_protect
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101 warning ("off");
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102 first_sentence = get_first_help_sentence (fn);
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103 status = 0;
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104 unwind_protect_cleanup
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105 warning (warn_state);
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106 end_unwind_protect
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107 catch
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108 status = 1;
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109 end_try_catch
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110
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111 if (search_type == 2) # search entire help text
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112 try
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113 warn_state = warning ();
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114 unwind_protect
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115 warning ("off");
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116 [text, fmt] = get_help_text (fn);
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117 status = 0;
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118 unwind_protect_cleanup
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119 warning (warn_state);
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120 end_unwind_protect
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121 catch
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122 status = 1;
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123 end_try_catch
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124
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125 ## Take action depending on help text fmt
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126 switch (lower (fmt))
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127 case "plain text"
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128 status = 0;
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129 case "texinfo"
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130 [text, status] = __makeinfo__ (text, "plain text");
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131 case "html"
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132 [text, status] = strip_html_tags (text);
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133 otherwise
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134 status = 1;
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135 endswitch
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136
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137 elseif (status == 0) # only search the first sentence of the help text
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138 text = first_sentence;
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139 endif
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140
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141 ## Search the help text, if we can
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142 if (status == 0 && !isempty (strfind (text, str)))
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143 fun (end+1) = fn;
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144 help_text (end+1) = first_sentence;
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145 endif
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146 endfor
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147 endif
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148 endfor
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149
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150 if (nargout == 0)
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151 ## Print the results (FIXME: improve this to make it look better.
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152 indent = 20;
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153 term_width = terminal_size() (2);
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154 desc_width = term_width - indent - 2;
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155 indent_space = repmat (" ", 1, indent);
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156 for k = 1:length (fun)
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157 f = fun {k};
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158 f (end+1:indent) = " ";
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159 printf (f);
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160 desc = strtrim (strrep (help_text {k}, "\n", " "));
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161 ldesc = length (desc);
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162 printf ("%s\n", desc (1:min (desc_width, ldesc)));
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163 for start = desc_width+1:desc_width:ldesc
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164 stop = min (start + desc_width, ldesc);
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165 printf ("%s%s\n", indent_space, strtrim (desc (start:stop)));
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166 endfor
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167 endfor
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168
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169 else
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170 ## Return the results instead of displaying them
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171 out_fun = fun;
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172 out_help_text = help_text;
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173 endif
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174 endfunction
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175
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176 function [funs, help_texts] = search_cache (str, cache_file, search_type)
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177 load (cache_file);
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178 if (! isempty (cache))
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179 t1 = strfind (cache (1, :), str);
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180 t2 = strfind (cache (search_type, :), str);
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181 cache_idx = find (! (cellfun ("isempty", t1) & cellfun ("isempty", t2)));
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182 funs = cache (1, cache_idx);
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183 help_texts = cache (3, cache_idx);
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184 else
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185 funs = help_texts = {};
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186 endif
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187 endfunction