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annotate scripts/help/lookfor.m @ 17804:f3e25230b1f3

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use QCoreApplication if starting with --no-gui * octave-gui.cc (octave_start_gui): Use QApplication when starting the GUI and QCoreApplication if not. (octave_cli_thread::run): Call QCoreApplication::exit instead of QApplication::exit.
author John W. Eaton <jwe@octave.org>
date Wed, 30 Oct 2013 02:08:41 -0400
parents d63878346099
children 4197fc428c7d
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1 ## Copyright (C) 2009-2013 Søren 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 @qcode{"-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 @qcode{"-all"}
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40 ## argument may be necessary to find related functions that are not a part of
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41 ## Octave.
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42 ## @seealso{help, doc, which}
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43 ## @end deftypefn
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44
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45 function [out_fun, out_help_text] = lookfor (str, arg2)
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46
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47 if (strcmpi (str, "-all"))
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48 ## The difference between using '-all' and not, is which part of the caches
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49 ## we search. The cache is organized such that the first column contains
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50 ## the function name, the second column contains the full help text, and
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51 ## the third column contains the first sentence of the help text.
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52 str = arg2;
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53 search_type = 2; # when using caches, search the second column
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54 else
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55 search_type = 3; # when using caches, search the third column
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56 endif
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57 str = lower (str); # Compare is case insensitive
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58
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59 ## Search functions, operators, and keywords that come with Octave
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60 cache_file = doc_cache_file ();
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61 if (exist (cache_file, "file"))
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62 [fun, help_text] = search_cache (str, cache_file, search_type);
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63 had_core_cache = true;
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64 else
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65 fun = help_text = {};
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66 had_core_cache = false;
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67 endif
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68
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69 ## Search functions in new path dirs.
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70 orig_path = ostrsplit (__pathorig__ (), pathsep ());
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71
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72 ## ditto for path.
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73 new_path = ostrsplit (path (), pathsep ());
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74
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75 ## scratch out directories already covered by orig_path.
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76 if (had_core_cache)
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77 new_path = setdiff (new_path, orig_path);
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78 endif
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79
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80 for n = 1:numel (new_path)
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81 elt = new_path{n};
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82 cache_file = fullfile (elt, "doc-cache");
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83 if (exist (cache_file, "file"))
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84 ## We have a cache in the directory, then read it and search it!
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85 [funs, hts] = search_cache (str, cache_file, search_type);
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86 fun(end+1:end+length (funs)) = funs;
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87 help_text(end+1:end+length (hts)) = hts;
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88 else
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89 ## We don't have a cache. Search files
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90 funs_in_f = __list_functions__ (elt);
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91 for m = 1:length (funs_in_f)
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92 fn = funs_in_f{m};
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93
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94 ## Skip files that start with __
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95 if (length (fn) > 2 && strcmp (fn(1:2), "__"))
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96 continue;
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97 endif
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98
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99 ## Extract first sentence
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100 try
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101 warn_state = warning ();
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102 unwind_protect
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103 warning ("off");
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104 first_sentence = get_first_help_sentence (fn, 1024);
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105 status = 0;
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106 unwind_protect_cleanup
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107 warning (warn_state);
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108 end_unwind_protect
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109 catch
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110 status = 1;
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111 end_try_catch
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112
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113 if (search_type == 2) # search entire help text
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114 try
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115 warn_state = warning ();
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116 unwind_protect
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117 warning ("off");
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118 [text, fmt] = get_help_text (fn);
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119 status = 0;
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120 unwind_protect_cleanup
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121 warning (warn_state);
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122 end_unwind_protect
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123 catch
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124 status = 1;
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125 end_try_catch
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126
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127 ## Take action depending on help text fmt
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128 switch (lower (fmt))
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129 case "plain text"
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130 status = 0;
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131 case "texinfo"
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132 [text, status] = __makeinfo__ (text, "plain text");
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133 case "html"
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134 [text, status] = strip_html_tags (text);
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135 otherwise
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136 status = 1;
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137 endswitch
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138
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139 elseif (status == 0) # only search the first sentence of the help text
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140 text = first_sentence;
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141 endif
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142
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143 ## Search the help text, if we can
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144 if (status == 0 && ! isempty (strfind (lower (text), str)))
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145 fun(end+1) = fn;
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146 help_text(end+1) = first_sentence;
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147 endif
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148 endfor
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149 endif
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150 endfor
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151
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152 if (nargout == 0)
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153 ## Print the results (FIXME: it would be nice to break at word boundaries)
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154 indent = 20;
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155 term_width = (terminal_size ())(2);
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156 desc_width = term_width - indent - 2;
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157 indent_space = blanks (indent);
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158 for k = 1:length (fun)
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159 f = fun{k};
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160 f(end+1:indent-1) = " ";
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161 puts ([f " "]);
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162 lf = length (f);
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163 desc = strtrim (strrep (help_text{k}, "\n", " "));
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164 ldesc = length (desc);
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165 printf ("%s\n", desc(1:min (ldesc, desc_width - (lf - indent))));
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166 for start = (desc_width - (lf - indent) + 1):desc_width:ldesc
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167 stop = min (start + desc_width, ldesc);
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168 printf ("%s%s\n", indent_space, strtrim (desc (start:stop)));
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169 endfor
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170 endfor
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171
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172 else
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173 ## Return the results instead of displaying them
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174 out_fun = fun;
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175 out_help_text = help_text;
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176 endif
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177
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178 endfunction
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179
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180 function [funs, help_texts] = search_cache (str, cache_file, search_type)
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181 load (cache_file);
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182 if (! isempty (cache))
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183 t1 = strfind (lower (cache (1, :)), str);
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184 t2 = strfind (lower (cache (search_type, :)), str);
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185 cache_idx = find (! (cellfun ("isempty", t1) & cellfun ("isempty", t2)));
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186 funs = cache(1, cache_idx);
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187 help_texts = cache(3, cache_idx);
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188 else
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189 funs = help_texts = {};
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190 endif
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191 endfunction
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192