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annotate scripts/help/print_usage.m @ 11587:c792872f8942

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all script files: untabify and strip trailing whitespace
author John W. Eaton <jwe@octave.org>
date Thu, 20 Jan 2011 17:35:29 -0500
parents fd0a3ac60b0e
children 208f0a181be6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 {Function File} {} print_usage ()
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21 ## @deftypefnx {Function File} {} print_usage (@var{name})
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22 ## Print the usage message for a function. When called with no input arguments
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23 ## the @code{print_usage} function displays the usage message of the currently
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24 ## executing function.
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25 ## @seealso{help}
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26 ## @end deftypefn
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27
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28 function print_usage (name)
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29 x = dbstack ();
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30 ## Handle input
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31 if (nargin == 0)
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32 ## Determine the name of the calling function
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33 if (numel (x) > 1)
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34 name = x (2).name;
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35 else
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36 error ("print_usage: invalid function\n");
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37 endif
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38 fullpath = evalin ("caller", "mfilename (""fullpath"")");
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39 if (strcmp (fullpath(end-length(name)+1:end), name))
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40 fullname = [fullpath, ".m"];
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41 endif
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42 elseif (!ischar (name))
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43 error ("print_usage: input argument must be a string");
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44 else
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45 fullname = name;
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46 endif
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47
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48 ## Determine if we're called from top level.
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49 at_toplev = length (x) < 2 || (length (x) == 2 && strcmp (x(2).name, name));
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50
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51 ## Do the actual work
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52 [text, format] = get_help_text (fullname);
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53 max_len = 80;
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54 switch (lower (format))
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55 case "plain text"
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56 [usage_string, status] = get_usage_plain_text (text, max_len);
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57 case "texinfo"
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58 [usage_string, status] = get_usage_texinfo (text, max_len);
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59 case "html"
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60 [usage_string, status] = get_usage_html (text, max_len);
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61 case "not documented"
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62 error ("print_usage: `%s' is not documented\n", name);
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63 case "not found"
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64 error ("print_usage: `%s' not found\n", name);
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65 otherwise
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66 error ("print_usage: internal error: unsupported help text format: '%s'\n", format);
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67 endswitch
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68
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69 ## Raise the final error
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70 if (status != 0)
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71 warning ("print_usage: Texinfo formatting filter exited abnormally");
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72 warning ("print_usage: raw Texinfo source of help text follows...\n");
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73 endif
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74
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75 if (at_toplev)
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76 error ("Invalid call to %s. Correct usage is:\n\n%s\n%s",
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77 name, usage_string, __additional_help_message__ ());
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78 else
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79 msg = sprintf ("Invalid call to %s. Correct usage is:\n\n%s",
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80 name, usage_string);
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81 ## Ensure that the error doesn't end up with a newline, as that disables
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82 ## backtraces.
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83 if (msg(end) == "\n")
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84 msg(end) = " ";
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85 endif
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86
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87 error (msg);
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88 endif
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89
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90 endfunction
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91
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92 function [retval, status] = get_usage_plain_text (help_text, max_len)
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93 ## Extract first line by searching for a double line-end.
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94 line_end_idx = strfind (help_text, "\n\n");
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95 retval = help_text (1:min ([line_end_idx , max_len, length(help_text)]));
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96 status = 0;
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97 endfunction
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98
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99 function [retval, status] = get_usage_texinfo (help_text, max_len)
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100 ## Lines ending with "@\n" are continuation lines, so they should be
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101 ## concatenated with the following line.
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102 help_text = strrep (help_text, "@\n", " ");
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103
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104 ## Find, and keep, lines that start with @def or @end def. This should include things
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105 ## such as @deftypefn, @deftypefnx, @defvar, etc. and their corresponding @end's
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106 def_idx = strfind (help_text, "@def");
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107 if (!isempty (def_idx))
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108 buffer = "";
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109 endl_idx = find (help_text == "\n");
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110 for k = 1:length (def_idx)
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111 endl = endl_idx (find (endl_idx > def_idx (k), 1));
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112 if (isempty (endl))
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113 buffer = strcat (buffer, help_text (def_idx (k):end), "\n");
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114 else
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115 buffer = strcat (buffer, help_text (def_idx (k):endl));
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116 endif
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117 endfor
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118
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119 end_def_idx = strfind (help_text, "@end def");
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120 if (!isempty (end_def_idx))
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121 buffer = strcat (buffer, help_text (end_def_idx:end));
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122 endif
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123 else
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124 [retval, status] = get_usage_plain_text (help_text, max_len);
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125 endif
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126
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127 ## Run makeinfo to generate plain text
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128 [retval, status] = __makeinfo__ (buffer, "plain text");
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129 endfunction
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130
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131 function [retval, status] = get_usage_html (help_text, max_len)
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132 ## Strip tags
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133 [help_text, status] = strip_html_tags (help_text);
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134
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135 ## Extract first line with plain text method.
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136 retval = get_usage_plain_text (help_text, max_len);
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137 endfunction
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138