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1 | # Pod::Text::Termcap -- Convert POD data to ASCII text with format escapes. |
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2 | # $Id: Termcap.pm,v 2.1 2004/12/31 21:50:00 eagle Exp $ |
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3 | # |
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4 | # Copyright 1999, 2001, 2002, 2004 by Russ Allbery <rra@stanford.edu> |
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5 | # |
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6 | # This program is free software; you may redistribute it and/or modify it |
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7 | # under the same terms as Perl itself. |
8 | # |
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9 | # This is a simple subclass of Pod::Text that overrides a few key methods to |
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10 | # output the right termcap escape sequences for formatted text on the current |
11 | # terminal type. |
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12 | |
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13 | ############################################################################## |
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14 | # Modules and declarations |
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15 | ############################################################################## |
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16 | |
17 | package Pod::Text::Termcap; |
18 | |
19 | require 5.004; |
20 | |
21 | use Pod::Text (); |
22 | use POSIX (); |
23 | use Term::Cap; |
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24 | |
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25 | use strict; |
26 | use vars qw(@ISA $VERSION); |
27 | |
28 | @ISA = qw(Pod::Text); |
29 | |
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30 | # Don't use the CVS revision as the version, since this module is also in Perl |
31 | # core and too many things could munge CVS magic revision strings. This |
32 | # number should ideally be the same as the CVS revision in podlators, however. |
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33 | $VERSION = 2.01; |
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34 | |
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35 | ############################################################################## |
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36 | # Overrides |
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37 | ############################################################################## |
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38 | |
39 | # In the initialization method, grab our terminal characteristics as well as |
40 | # do all the stuff we normally do. |
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41 | sub new { |
42 | my ($self, @args) = @_; |
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43 | my ($ospeed, $term, $termios); |
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44 | $self = $self->SUPER::new (@args); |
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45 | |
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46 | # $ENV{HOME} is usually not set on Windows. The default Term::Cap path |
47 | # may not work on Solaris. |
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48 | my $home = exists $ENV{HOME} ? "$ENV{HOME}/.termcap:" : ''; |
49 | $ENV{TERMPATH} = $home . '/etc/termcap:/usr/share/misc/termcap' |
50 | . ':/usr/share/lib/termcap'; |
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51 | |
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52 | # Fall back on a hard-coded terminal speed if POSIX::Termios isn't |
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53 | # available (such as on VMS). |
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54 | eval { $termios = POSIX::Termios->new }; |
55 | if ($@) { |
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56 | $ospeed = 9600; |
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57 | } else { |
58 | $termios->getattr; |
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59 | $ospeed = $termios->getospeed || 9600; |
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60 | } |
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61 | |
62 | # Fall back on the ANSI escape sequences if Term::Cap doesn't work. |
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63 | eval { $term = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed } }; |
64 | $$self{BOLD} = $$term{_md} || "\e[1m"; |
65 | $$self{UNDL} = $$term{_us} || "\e[4m"; |
66 | $$self{NORM} = $$term{_me} || "\e[m"; |
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67 | |
68 | unless (defined $$self{width}) { |
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69 | $$self{opt_width} = $ENV{COLUMNS} || $$term{_co} || 80; |
70 | $$self{opt_width} -= 2; |
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71 | } |
72 | |
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73 | return $self; |
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74 | } |
75 | |
76 | # Make level one headings bold. |
77 | sub cmd_head1 { |
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78 | my ($self, $attrs, $text) = @_; |
79 | $text =~ s/\s+$//; |
80 | $self->SUPER::cmd_head1 ($attrs, "$$self{BOLD}$text$$self{NORM}"); |
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81 | } |
82 | |
83 | # Make level two headings bold. |
84 | sub cmd_head2 { |
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85 | my ($self, $attrs, $text) = @_; |
86 | $text =~ s/\s+$//; |
87 | $self->SUPER::cmd_head2 ($attrs, "$$self{BOLD}$text$$self{NORM}"); |
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88 | } |
89 | |
90 | # Fix up B<> and I<>. Note that we intentionally don't do F<>. |
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91 | sub cmd_b { my $self = shift; return "$$self{BOLD}$_[1]$$self{NORM}" } |
92 | sub cmd_i { my $self = shift; return "$$self{UNDL}$_[1]$$self{NORM}" } |
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93 | |
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94 | # Output any included code in bold. |
95 | sub output_code { |
96 | my ($self, $code) = @_; |
97 | $self->output ($$self{BOLD} . $code . $$self{NORM}); |
98 | } |
99 | |
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100 | # Override the wrapping code to igore the special sequences. |
101 | sub wrap { |
102 | my $self = shift; |
103 | local $_ = shift; |
104 | my $output = ''; |
105 | my $spaces = ' ' x $$self{MARGIN}; |
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106 | my $width = $$self{opt_width} - $$self{MARGIN}; |
107 | |
108 | # $codes matches a single special sequence. $char matches any number of |
109 | # special sequences preceeding a single character other than a newline. |
110 | my $codes = "(?:\Q$$self{BOLD}\E|\Q$$self{UNDL}\E|\Q$$self{NORM}\E)"; |
111 | my $char = "(?:$codes*[^\\n])"; |
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112 | while (length > $width) { |
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113 | if (s/^(${char}{0,$width})\s+// || s/^(${char}{$width})//) { |
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114 | $output .= $spaces . $1 . "\n"; |
115 | } else { |
116 | last; |
117 | } |
118 | } |
119 | $output .= $spaces . $_; |
120 | $output =~ s/\s+$/\n\n/; |
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121 | return $output; |
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122 | } |
123 | |
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124 | ############################################################################## |
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125 | # Module return value and documentation |
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126 | ############################################################################## |
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127 | |
128 | 1; |
129 | __END__ |
130 | |
131 | =head1 NAME |
132 | |
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133 | Pod::Text::Termcap - Convert POD data to ASCII text with format escapes |
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134 | |
135 | =head1 SYNOPSIS |
136 | |
137 | use Pod::Text::Termcap; |
138 | my $parser = Pod::Text::Termcap->new (sentence => 0, width => 78); |
139 | |
140 | # Read POD from STDIN and write to STDOUT. |
141 | $parser->parse_from_filehandle; |
142 | |
143 | # Read POD from file.pod and write to file.txt. |
144 | $parser->parse_from_file ('file.pod', 'file.txt'); |
145 | |
146 | =head1 DESCRIPTION |
147 | |
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148 | Pod::Text::Termcap is a simple subclass of Pod::Text that highlights output |
149 | text using the correct termcap escape sequences for the current terminal. |
150 | Apart from the format codes, it in all ways functions like Pod::Text. See |
151 | L<Pod::Text> for details and available options. |
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152 | |
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153 | =head1 NOTES |
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154 | |
155 | This module uses Term::Cap to retrieve the formatting escape sequences for |
156 | the current terminal, and falls back on the ECMA-48 (the same in this |
157 | regard as ANSI X3.64 and ISO 6429, the escape codes also used by DEC VT100 |
158 | terminals) if the bold, underline, and reset codes aren't set in the |
159 | termcap information. |
160 | |
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161 | =head1 SEE ALSO |
162 | |
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163 | L<Pod::Text>, L<Pod::Simple>, L<Term::Cap> |
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164 | |
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165 | The current version of this module is always available from its web site at |
166 | L<http://www.eyrie.org/~eagle/software/podlators/>. It is also part of the |
167 | Perl core distribution as of 5.6.0. |
168 | |
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169 | =head1 AUTHOR |
170 | |
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171 | Russ Allbery <rra@stanford.edu>. |
172 | |
173 | =head1 COPYRIGHT AND LICENSE |
174 | |
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175 | Copyright 1999, 2001, 2002, 2004 by Russ Allbery <rra@stanford.edu>. |
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176 | |
177 | This program is free software; you may redistribute it and/or modify it |
178 | under the same terms as Perl itself. |
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179 | |
180 | =cut |