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annotate scripts/help/lookfor.m @ 20135:4c6d70a35192

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lookfor.m: Overhaul function and fix bug #44924. * lookfor.m: Rewrite docstring. Match variable names in function prototype to docstring. Use more meaningful variable names throughout function. Don't continue to process a function if get_first_help_sentence returns an error (bug #44924). Iterate directly over cell list rather than using a for loop with a range to index into cell list.
author Rik <rik@octave.org>
date Sun, 26 Apr 2015 21:14:53 -0700
parents 4197fc428c7d
children 7503499a252b
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1 ## Copyright (C) 2009-2015 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{fcn}, @var{help1str}] =} lookfor (@var{str})
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23 ## @deftypefnx {Function File} {[@var{fcn}, @var{help1str}] =} lookfor ("-all", @var{str})
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24 ## Search for the string @var{str} in all functions using the current function
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25 ## search path.
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26 ##
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27 ## By default, @code{lookfor} looks for @var{str} in the first sentence of the
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28 ## help string for each function found. The entire help text of each function
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29 ## can be searched by using the @qcode{"-all"} argument. All searches are case
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30 ## insensitive.
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31 ##
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32 ## When called with no output arguments, @code{lookfor} prints the list of
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33 ## matching functions to the terminal. Otherwise, the output argument
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34 ## @var{fcns} contains the function names and @var{help1str} contains the first
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35 ## sentence from the help string of each function.
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36 ##
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37 ## Programming Note: The ability of @code{lookfor} to correctly identify the
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38 ## first sentence of the help text is dependent on the format of the function's
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39 ## help. All Octave core functions are correctly formatted, but the same can
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40 ## not be guaranteed for external packages and user-supplied functions.
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41 ## Therefore, the use of the @qcode{"-all"} argument may be necessary to find
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42 ## related functions that are not a part of Octave.
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43 ## @seealso{help, doc, which}
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44 ## @end deftypefn
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45
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46 function [fcn, help1str] = lookfor (str, arg2)
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47
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48 if (strcmpi (str, "-all"))
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49 ## The difference between using '-all' and not is which part of the caches
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50 ## we search. The cache is organized such that row
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51 ## 1) contains the function name
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52 ## 2) contains the full help text
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53 ## 3) contains the first sentence of the help text.
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54 str = arg2;
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55 search_type = 2; # search the second row (full help text)
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56 else
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57 search_type = 3; # search the third column (first help sentence)
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58 endif
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59 str = lower (str); # Compare is case insensitive
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60
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61 ## Search functions, operators, and keywords that come with Octave
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62 cache_file = doc_cache_file ();
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63 if (exist (cache_file, "file"))
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64 [fcnlist, help_text] = search_cache (str, cache_file, search_type);
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65 had_core_cache = true;
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66 else
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67 fcnlist = help_text = {};
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68 had_core_cache = false;
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69 endif
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70
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71 ## Search functions in new path dirs.
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72 orig_path = ostrsplit (__pathorig__ (), pathsep ());
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73
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74 ## ditto for path.
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75 new_path = ostrsplit (path (), pathsep ());
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76
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77 ## remove directories already covered by orig_path.
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78 if (had_core_cache)
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79 new_path = setdiff (new_path, orig_path);
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80 endif
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81
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82 for n = 1:numel (new_path)
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83 fcndir = new_path{n};
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84 cache_file = fullfile (fcndir, "doc-cache");
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85 if (exist (cache_file, "file"))
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86 ## We have a cache in the directory, then read it and search it!
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87 [fcns, htext] = search_cache (str, cache_file, search_type);
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88 fcnlist(end+1:end+length (fcns)) = fcns;
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89 help_text(end+1:end+length (htext)) = htext;
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90
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91 else
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92 ## We don't have a cache. Search files.
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93 for fcn_in_fcndir = (__list_functions__ (fcndir)).'
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94 fn = fcn_in_fcndir{1};
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95
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96 ## Skip files that start with "__"
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97 if (strncmp (fn, "__", 2))
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98 continue;
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99 endif
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100
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101 status = 0;
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102
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103 ## Extract first sentence
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104 try
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105 warn_state = warning ();
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106 unwind_protect
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107 warning ("off");
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108 first_sentence = get_first_help_sentence (fn, 1024);
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109 unwind_protect_cleanup
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110 warning (warn_state);
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111 end_unwind_protect
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112 catch
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113 status = 1;
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114 end_try_catch
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115
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116 if (status)
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117 ## Error getting first help sentence
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118 elseif (search_type == 3)
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119 ## only search the first sentence of the help text
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120 text = first_sentence;
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121 elseif (search_type == 2)
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122 ## search entire help text
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123 try
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124 warn_state = warning ();
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125 unwind_protect
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126 warning ("off");
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127 [text, fmt] = get_help_text (fn);
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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 unwind_protect_cleanup
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139 warning (warn_state);
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140 end_unwind_protect
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141 catch
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142 status = 1;
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143 end_try_catch
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144 endif
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145
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146 ## Search the help text
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147 if (status == 0 && strfind (lower (text), str))
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148 fcnlist(end+1) = fn;
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149 help_text(end+1) = first_sentence;
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150 endif
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151 endfor
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152 endif
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153 endfor
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154
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155 if (nargout == 0)
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156 ## Print the results (FIXME: it would be nice to break at word boundaries)
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157 indent = 20;
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158 term_width = (terminal_size ())(2);
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159 desc_width = term_width - indent - 2;
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160 indent_space = blanks (indent);
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161 for k = 1:length (fcnlist)
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162 f = fcnlist{k};
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163 f(end+1:indent-1) = " ";
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164 puts ([f " "]);
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165 lf = length (f);
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166 desc = strtrim (strrep (help_text{k}, "\n", " "));
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167 ldesc = length (desc);
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168 printf ("%s\n", desc(1:min (ldesc, desc_width - (lf - indent))));
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169 for start = (desc_width - (lf - indent) + 1):desc_width:ldesc
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170 stop = min (start + desc_width, ldesc);
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171 printf ("%s%s\n", indent_space, strtrim (desc (start:stop)));
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172 endfor
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173 endfor
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174 else
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175 ## Return the results instead of displaying them
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176 fcn = fcnlist;
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177 help1str = help_text;
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178 endif
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179
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180 endfunction
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181
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182 function [fcns, help_texts] = search_cache (str, cache_file, search_type)
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183 load (cache_file);
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184 if (! isempty (cache))
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185 t1 = strfind (lower (cache (1, :)), str);
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186 t2 = strfind (lower (cache (search_type, :)), str);
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187 cache_idx = find (! (cellfun ("isempty", t1) & cellfun ("isempty", t2)));
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188 fcns = cache(1, cache_idx);
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189 help_texts = cache(3, cache_idx);
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190 else
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191 fcns = help_texts = {};
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192 endif
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193 endfunction
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194