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annotate scripts/help/help.m @ 11565:21c3e1370b82

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implement --list option for help function
author John W. Eaton <jwe@octave.org>
date Wed, 19 Jan 2011 05:05:07 -0500
parents 3c6e8aaa9555
children 5c18da80e28a
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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} {} help @var{name}
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21 ## @deftypefn {Command} {} help @code{--list}
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22 ## Display the help text for @var{name}.
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23 ## If invoked without any arguments, @code{help} display instructions
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24 ## on how to access help from the command line.
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25 ##
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26 ## For example, the command @kbd{help help} prints a short message
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27 ## describing the @code{help} command.
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28 ##
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29 ## Given the single argument @code{--list}, list all operators,
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30 ## keywords, built-in functions, and loadable functions available
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31 ## in the current session of Octave.
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32 ##
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33 ## @deftypefnx {Function File} {@var{text} =} help (@var{name})
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34 ## Return the help text for the function, @var{name}.
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35 ##
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36 ## The help command can give you information about operators, but not the
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37 ## comma and semicolons that are used as command separators. To get help
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38 ## for those, you must type @kbd{help comma} or @kbd{help semicolon}.
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39 ## @seealso{doc, lookfor, which}
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40 ## @end deftypefn
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41
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42 function retval = help (name)
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43
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44 if (nargin == 0)
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45
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46 puts ("\n\
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47 For help with individual commands and functions type\n\
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48 \n\
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49 help NAME\n\
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50 \n\
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51 (replace NAME with the name of the command or function you would\n\
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52 like to learn more about).\n\
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53 \n\
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54 For a more detailed introduction to GNU Octave, please consult the\n\
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55 manual. To read the manual from the prompt type\n\
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56 \n\
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57 doc\n\
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58 \n\
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59 GNU Octave is supported and developed by its user community.\n\
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60 For more information visit http://www.octave.org.\n\n");
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61
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62 elseif (nargin == 1 && ischar (name))
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63
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64 if (strcmp (name, "--list"))
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65 tmp = do_list_functions ();
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66 if (nargout == 0)
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67 printf ("%s", tmp);
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68 else
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69 retval = tmp;
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70 endif
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71 return;
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72 endif
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73
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74 ## Get help text
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75 [text, format] = get_help_text (name);
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76
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77 ## Take action depending on help text format
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78 switch (lower (format))
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79 case "plain text"
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80 status = 0;
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81 case "texinfo"
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82 [text, status] = __makeinfo__ (text, "plain text");
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83 case "html"
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84 [text, status] = strip_html_tags (text);
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85 case "not documented"
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86 error ("help: `%s' is not documented\n", name);
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87 case "not found"
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88 do_contents (name);
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89 return;
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90 otherwise
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91 error ("help: internal error: unsupported help text format: '%s'\n", format);
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92 endswitch
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93
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94 ## Print text
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95 if (status != 0)
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96 warning ("help: Texinfo formatting filter exited abnormally; raw Texinfo source of help text follows...\n");
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97 endif
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98
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99 if (nargout == 0)
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100 which (name);
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101 printf ("\n%s\n%s", text, __additional_help_message__ ());
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102 else
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103 retval = text;
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104 endif
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105
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106 else
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107 error ("help: invalid input\n");
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108 endif
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109
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110 endfunction
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111
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112 function retval = do_list_functions ()
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113
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114 operators = sprintf ("*** operators:\n\n%s\n\n",
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115 list_in_columns (__operators__ ()));
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116
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117 keywords = sprintf ("*** keywords:\n\n%s\n\n",
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118 list_in_columns (__keywords__ ()));
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119
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120 builtins = sprintf ("*** builtins:\n\n%s\n\n",
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121 list_in_columns (__builtins__ ()));
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122
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123 dirs = strsplit (path, pathsep);
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124 flist = "";
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125 for i = 2:numel (dirs)
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126 files = sort ({dir(fullfile (dirs{i}, "*.m")).name, ...
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127 dir(fullfile (dirs{i}, "*.oct")).name, ...
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128 dir(fullfile (dirs{i}, "*.mex")).name});
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129
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130 if (! isempty (files))
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131 flist = sprintf ("%s*** functions in %s:\n\n%s\n\n",
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132 flist, dirs{i}, list_in_columns (files));
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133 endif
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134 endfor
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135
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136 retval = cstrcat (operators, keywords, builtins, flist);
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137
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138 endfunction
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139
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140 function do_contents (name)
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141
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142 found = false;
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143
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144 dlist = find_dir_in_path (name, "all");
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145
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146 for i = 1:numel (dlist)
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147 fname = make_absolute_filename (fullfile (dlist{i}, "Contents.m"));
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148
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149 [text, format] = get_help_text_from_file (fname);
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150
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151 ## Take action depending on help text format
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152 switch (lower (format))
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153 case "plain text"
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154 status = 0;
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155 case "texinfo"
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156 [text, status] = __makeinfo__ (text, "plain text");
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157 case "html"
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158 [text, status] = strip_html_tags (text);
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159 endswitch
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160
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161 if (! isempty (text))
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162 found = true;
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163 ## Print text.
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164 if (status != 0)
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165 warning ("help: Texinfo formatting filter exited abnormally; raw Texinfo source of help text follows...\n");
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166 endif
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167 printf ("%s:\n\n%s\n", fname, text);
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168 endif
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169
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170 endfor
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171
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172 if (found)
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173 puts (__additional_help_message__ ());
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174 else
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175 msg = feval (missing_function_hook, name);
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176
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177 if (isempty (msg))
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178 msg = sprintf ("`%s' not found", name);
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179 endif
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180
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181 error ("help: %s\n", msg);
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182 endif
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183
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184 endfunction