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annotate scripts/help/print_usage.m @ 20778:8513c84a13cb

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Use parser string concatenation rather than strcat() for performance in m-files. * __file_filter__.m, __get_funcname__.m, uigetfile.m, uiputfile.m, __makeinfo__.m, print_usage.m, fix_version.m, axis.m, __add_datasource__.m, print.m, __gnuplot_draw_axes__.m, __gnuplot_print__.m, __opengl_print__.m, __print_parse_opts__.m, saveas.m, html_compare_plot_demos.m: Use parser string concatenation rather than strcat() for performance in m-files.
author Rik <rik@octave.org>
date Mon, 30 Nov 2015 08:20:08 -0800
parents 7503499a252b
children 516bb87ea72e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 {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 the function @var{name}.
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23 ##
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24 ## When called with no input arguments the @code{print_usage} function displays
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25 ## the usage message of the currently executing function.
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26 ## @seealso{help}
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27 ## @end deftypefn
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28
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29 function print_usage (name)
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30 x = dbstack ();
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31 ## Handle input
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32 if (nargin == 0)
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33 ## Determine the name of the calling function
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34 if (numel (x) > 1)
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35 name = x(2).name;
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36 else
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37 error ("Octave:invalid-context", "print_usage: invalid function\n");
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38 endif
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39 fullpath = evalin ("caller", 'mfilename ("fullpath")');
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40 if (strcmp (fullpath(end-length(name)+1:end), name))
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41 fullname = [fullpath ".m"];
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42 endif
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43 elseif (! ischar (name))
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44 error ("Octave:invalid-input-arg",
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45 "print_usage: input argument must be a string");
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46 else
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47 fullname = name;
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48 endif
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49
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50 ## Determine if we were called from top level.
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51 at_toplev = length (x) < 2 || (length (x) == 2 && strcmp (x(2).name, name));
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52
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53 ## Do the actual work
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54 [text, format] = get_help_text (fullname);
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55 max_len = 80;
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56 switch (lower (format))
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57 case "plain text"
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58 [usage_string, status] = get_usage_plain_text (text, max_len);
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59 case "texinfo"
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60 [usage_string, status] = get_usage_texinfo (text, max_len);
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61 case "html"
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62 [usage_string, status] = get_usage_html (text, max_len);
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63 case "not documented"
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64 error ("print_usage: '%s' is not documented\n", name);
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65 case "not found"
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66 error ("print_usage: '%s' not found\n", name);
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67 otherwise
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68 error ("print_usage: internal error: unsupported help text format: '%s'\n", format);
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69 endswitch
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70
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71 ## Raise the final error
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72 if (status != 0)
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73 warning ("print_usage: Texinfo formatting filter exited abnormally");
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74 warning ("print_usage: raw Texinfo source of help text follows...\n");
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75 endif
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76
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77 if (at_toplev)
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78 error ("Octave:invalid-fun-call",
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79 "Invalid call to %s. Correct usage is:\n\n%s\n%s",
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80 name, usage_string, __additional_help_message__ ());
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81 else
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82 msg = sprintf ("Invalid call to %s. Correct usage is:\n\n%s",
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83 name, usage_string);
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84 ## Ensure that the error doesn't end up with a newline, as that disables
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85 ## backtraces.
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86 if (msg(end) == "\n")
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87 msg(end) = " ";
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88 endif
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89
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90 error ("Octave:invalid-fun-call", msg);
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91 endif
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92
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93 endfunction
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94
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95 function [retval, status] = get_usage_plain_text (help_text, max_len)
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96 ## Extract first line by searching for a double line-end.
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97 line_end_idx = strfind (help_text, "\n\n");
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98 retval = help_text (1:min ([line_end_idx , max_len, length(help_text)]));
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99 status = 0;
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100 endfunction
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101
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102 function [retval, status] = get_usage_texinfo (help_text, max_len)
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103 ## Lines ending with "@\n" are continuation lines, so they should be
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104 ## concatenated with the following line.
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105 help_text = strrep (help_text, "@\n", " ");
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106
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107 ## Find, and keep, lines that start with @def or @end def. This should
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108 ## include things such as @deftypefn, @deftypefnx, @defvar, etc. and their
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109 ## corresponding @end's.
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110 def_idx = strfind (help_text, "@def");
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111 if (! isempty (def_idx))
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112 endf_idx = strfind (help_text, "@end def");
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113 def_idx = sort ([def_idx, endf_idx]);
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114 endl_idx = find (help_text == "\n");
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115 buffer = "";
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116 for k = 1:length (def_idx)
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117 endl = endl_idx(find (endl_idx > def_idx(k), 1));
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118 if (isempty (endl))
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119 buffer = [buffer, help_text(def_idx(k):end), "\n"];
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120 else
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121 buffer = [buffer, help_text(def_idx(k):endl)];
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122 endif
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123 endfor
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124 else
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125 [retval, status] = get_usage_plain_text (help_text, max_len);
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126 endif
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127
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128 ## Run makeinfo to generate plain text
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129 [retval, status] = __makeinfo__ (buffer, "plain text");
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130 endfunction
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131
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132 function [retval, status] = get_usage_html (help_text, max_len)
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133 ## Strip tags
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134 [help_text, status] = strip_html_tags (help_text);
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135
8575
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136 ## Extract first line with plain text method.
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137 retval = get_usage_plain_text (help_text, max_len);
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138 endfunction
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139
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140
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141 ## Stop reporting function as missing tests. No good tests possible.
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142 %!assert (1)
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143