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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 28b8bd2f6e66
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8575
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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 {Function File} {[@var{retval}, @var{status}] =} makeinfo (@var{text}, @
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19 ## @var{output_type})
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20 ## @deftypefnx{Function File} {[@var{retval}, @var{status}] =} makeinfo (@var{text}, @
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21 ## @var{output_type}, @var{see_also})
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22 ## Run @code{makeinfo} on a given text.
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23 ##
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24 ## The string @var{text} is run through the @code{makeinfo} program to generate
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25 ## output in various formats. This string must contain valid Texinfo formatted
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26 ## text.
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27 ##
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28 ## The @var{output_type} selects the format of the output. This can be either
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29 ## @t{"html"}, @t{"texinfo"}, or @t{"plain text"}. By default this is
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30 ## @t{"plain text"}. If @var{output_type} is @t{"texinfo"}, the @t{@@seealso}
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31 ## macro is expanded, but otherwise the text is unaltered.
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32 ##
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33 ## If the optional argument @var{see_also} is present, it is used to expand the
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34 ## Octave specific @t{@@seealso} macro. This argument must be a function handle,
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35 ## that accepts a cell array of strings as input argument (each elements of the
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36 ## array corresponds to the arguments to the @t{@@seealso} macro), and return
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37 ## the expanded string. If this argument is not given, the @t{@@seealso} macro
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38 ## will be expanded to the text
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39 ##
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40 ## @example
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41 ## See also: arg1, arg2@, ...
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42 ## @end example
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43 ##
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44 ## @noindent
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45 ## for @t{"plain text"} output, and
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46 ##
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47 ## @example
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48 ## See also: @@ref@{arg1@}, @@ref@{arg2@}, ...
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49 ## @end example
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50 ##
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51 ## @noindent
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52 ## otherwise.
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53 ##
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54 ## The optional output argument @var{status} contains the exit status of the
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55 ## @code{makeinfo} program as returned by @code{system}.
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56 ## @end deftypefn
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57
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58 function [retval, status] = makeinfo (text, output_type = "plain text", see_also = [])
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59 ## Check input
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60 if (nargin == 0)
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61 print_usage ();
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62 endif
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63
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64 if (!ischar (text))
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65 error ("makeinfo: first input argument must be a string");
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66 endif
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67
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68 if (!ischar (output_type))
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69 error ("makeinfo: second input argument must be a string");
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70 endif
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71
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72 ## Define the @seealso macro
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73 if (isempty (see_also))
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74 if (strcmpi (output_type, "plain text"))
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75 see_also = @simple_see_also;
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76 else
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77 see_also = @simple_see_also_with_refs;
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78 endif
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79 endif
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80
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81 if (!isa (see_also, "function_handle"))
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82 error ("makeinfo: third input argument must be the empty matrix, or a function handle");
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83 endif
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84
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85 ## It seems like makeinfo sometimes gets angry if the character on a line is
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86 ## a space, so we remove these.
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87 text = strrep (text, "\n ", "\n");
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88
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89 ## Handle @seealso macro
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90 SEE_ALSO = "@seealso";
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91 start = strfind (text, SEE_ALSO);
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92 if (!isempty (start))
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93 if (start == 1 || (text (start-1) != "@"))
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94 bracket_start = find (text (start:end) == "{", 1);
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95 stop = find (text (start:end) == "}", 1);
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96 if (!isempty (stop) && !isempty (bracket_start))
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97 stop += start - 1;
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98 bracket_start += start - 1;
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99 else
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100 bracket_start = start + length (SEE_ALSO);
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101 stop = find (text (start:end) == "\n", 1);
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102 if (isempty (stop))
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103 stop = length (text);
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104 else
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105 stop += start - 1;
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106 endif
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107 endif
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108 see_also_args = text (bracket_start+1:(stop-1));
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109 see_also_args = strtrim (cellstr (split (see_also_args, ",")));
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110 expanded = see_also (see_also_args);
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111 text = strcat (text (1:start-1), expanded, text (stop+1:end));
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112 endif
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113 endif
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114
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115 if (strcmpi (output_type, "texinfo"))
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116 status = 0;
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117 retval = text;
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118 return;
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119 endif
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120
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121 ## Create the final TeXinfo input string
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122 text = sprintf ("\\input texinfo\n\n%s\n\n@bye\n", text);
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123
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124 unwind_protect
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125 ## Write Texinfo to tmp file
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126 [fid, name, msg] = mkstemp ("octave_help_XXXXXX", true);
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127 fwrite (fid, text);
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128 fclose (fid);
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129
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130 ## Take action depending on output type
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131 switch (lower (output_type))
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132 case "plain text"
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133 cmd = sprintf ("%s --no-headers --no-warn --force --no-validate %s",
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134 makeinfo_program (), name);
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135 case "html"
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136 cmd = sprintf ("%s --no-headers --html --no-warn --no-validate --force %s",
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137 makeinfo_program (), name);
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138 otherwise
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139 error ("makeinfo: unsupported output type: '%s'", output_type);
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140 endswitch
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141
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142 ## Call makeinfo
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143 [status, retval] = system (cmd);
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144
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145 unwind_protect_cleanup
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146 if (exist (name, "file"))
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147 delete (name);
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148 endif
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149 end_unwind_protect
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150 endfunction
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151
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152 function expanded = simple_see_also (args)
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153 expanded = strcat ("\nSee also:", sprintf (" %s,", args {:}));
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154 expanded = strcat (expanded (1:end-1), "\n\n");
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155 endfunction
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156
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157 function expanded = simple_see_also_with_refs (args)
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158 expanded = strcat ("\nSee also:", sprintf (" @ref{%s},", args {:}));
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159 expanded = strcat (expanded (1:end-1), "\n\n");
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160 endfunction