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m-file implementation of help system
author Soren Hauberg <soren@hauberg.org>
date Thu, 22 Jan 2009 18:22:52 -0500
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children 5a5dbdacbf5d
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8575
f134925a1cfa m-file implementation of help system
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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 ## PKG_ADD: mark_as_command lookfor
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43
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44 function [out_fun, out_help_text] = lookfor (str, extra)
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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 = extra;
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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 operators, keywords, and built-ins
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58 cache_file = fullfile (octave_config_info.datadir, "builtin_cache.mat");
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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 else
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62 fun = help_text = {};
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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 p = path ();
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67 idx = find (p == pathsep ());
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68 prev_idx = 1;
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69 for n = 1:length (idx)
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70 f = p (prev_idx:idx (n)-1);
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71 cache_file = fullfile (f, "help_cache.mat");
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72 if (exist (cache_file, "file"))
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73 ## We have a cache. Read it and search it!
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74 [funs, hts] = search_cache (str, cache_file, search_type);
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75 fun (end+1:end+length (funs)) = funs;
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76 help_text (end+1:end+length (hts)) = hts;
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77 else
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78 ## We don't have a cache. Search files
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79 funs_in_f = __list_functions__ (f);
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80 for m = 1:length (funs_in_f)
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81 fn = funs_in_f {m};
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82
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83 ## Skip files that start with __
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84 if (length (fn) > 2 && strcmp (fn (1:2), "__"))
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85 continue;
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86 endif
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87
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88 ## Extract first sentence
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89 try
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90 first_sentence = get_first_help_sentence (fn);
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91 status = 0;
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92 catch
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93 status = 1;
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94 end_try_catch
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95
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96 if (search_type == 2) # search entire help text
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97 [text, format] = get_help_text (fn);
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98
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99 ## Take action depending on help text format
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100 switch (lower (format))
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101 case "plain text"
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102 status = 0;
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103 case "texinfo"
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104 [text, status] = makeinfo (text, "plain text");
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105 case "html"
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106 [text, status] = strip_html_tags (text);
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107 otherwise
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108 status = 1;
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109 endswitch
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110
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111 elseif (status == 0) # only search the first sentence of the help text
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112 text = first_sentence;
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113 endif
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114
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115 ## Search the help text, if we can
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116 if (status == 0 && !isempty (strfind (text, str)))
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117 fun (end+1) = fn;
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118 help_text (end+1) = first_sentence;
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119 endif
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120 endfor
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121 endif
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122 prev_idx = idx (n) + 1;
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123 endfor
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124
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125 if (nargout == 0)
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126 ## Print the results (FIXME: improve this to make it look better.
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127 indent = 20;
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128 term_width = terminal_size() (2);
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129 desc_width = term_width - indent - 2;
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130 indent_space = repmat (" ", 1, indent);
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131 for k = 1:length (fun)
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132 f = fun {k};
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133 f (end+1:indent) = " ";
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134 printf (f);
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135 desc = strtrim (strrep (help_text {k}, "\n", " "));
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136 ldesc = length (desc);
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137 printf ("%s\n", desc (1:min (desc_width, ldesc)));
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138 for start = desc_width+1:desc_width:ldesc
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139 stop = min (start + desc_width, ldesc);
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140 printf ("%s%s\n", indent_space, strtrim (desc (start:stop)));
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141 endfor
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142 endfor
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143
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144 else
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145 ## Return the results instead of displaying them
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146 out_fun = fun;
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147 out_help_text = help_text;
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148 endif
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149 endfunction
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150
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151 function [funs, help_texts] = search_cache (str, cache_file, search_type)
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152 load (cache_file);
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153 if (! isempty(cache))
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154 tmp = strfind (cache (search_type, :), str);
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155 cache_idx = find (!cellfun ("isempty", tmp));
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156 funs = cache (1, cache_idx);
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157 help_texts = cache (3, cache_idx);
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158 else
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159 funs = help_texts = {};
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160 endif
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161 endfunction
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162