Installer: Early check whether the installation directory is writable
[msysgit.git] / bin / pod2text
blobbe54aed519a75d66adfc8976512b79dad0f4d79c
1 #!/usr/bin/perl
2 eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
3 if $running_under_some_shell;
5 # pod2text -- Convert POD data to formatted ASCII text.
7 # Copyright 1999, 2000, 2001 by Russ Allbery <rra@stanford.edu>
9 # This program is free software; you may redistribute it and/or modify it
10 # under the same terms as Perl itself.
12 # The driver script for Pod::Text, Pod::Text::Termcap, and Pod::Text::Color,
13 # invoked by perldoc -t among other things.
15 require 5.004;
17 use Getopt::Long qw(GetOptions);
18 use Pod::Text ();
19 use Pod::Usage qw(pod2usage);
21 use strict;
23 # Silence -w warnings.
24 use vars qw($running_under_some_shell);
26 # Take an initial pass through our options, looking for one of the form
27 # -<number>. We turn that into -w <number> for compatibility with the
28 # original pod2text script.
29 for (my $i = 0; $i < @ARGV; $i++) {
30 last if $ARGV[$i] =~ /^--$/;
31 if ($ARGV[$i] =~ /^-(\d+)$/) {
32 splice (@ARGV, $i++, 1, '-w', $1);
36 # Insert -- into @ARGV before any single dash argument to hide it from
37 # Getopt::Long; we want to interpret it as meaning stdin (which Pod::Parser
38 # does correctly).
39 my $stdin;
40 @ARGV = map { $_ eq '-' && !$stdin++ ? ('--', $_) : $_ } @ARGV;
42 # Parse our options. Use the same names as Pod::Text for simplicity, and
43 # default to sentence boundaries turned off for compatibility.
44 my %options;
45 $options{sentence} = 0;
46 Getopt::Long::config ('bundling');
47 GetOptions (\%options, 'alt|a', 'code', 'color|c', 'help|h', 'indent|i=i',
48 'loose|l', 'margin|left-margin|m=i', 'overstrike|o',
49 'quotes|q=s', 'sentence|s', 'termcap|t', 'width|w=i') or exit 1;
50 pod2usage (1) if $options{help};
52 # Figure out what formatter we're going to use. -c overrides -t.
53 my $formatter = 'Pod::Text';
54 if ($options{color}) {
55 $formatter = 'Pod::Text::Color';
56 eval { require Term::ANSIColor };
57 if ($@) { die "-c (--color) requires Term::ANSIColor be installed\n" }
58 require Pod::Text::Color;
59 } elsif ($options{termcap}) {
60 $formatter = 'Pod::Text::Termcap';
61 require Pod::Text::Termcap;
62 } elsif ($options{overstrike}) {
63 $formatter = 'Pod::Text::Overstrike';
64 require Pod::Text::Overstrike;
66 delete @options{'color', 'termcap', 'overstrike'};
68 # Initialize and run the formatter.
69 my $parser = $formatter->new (%options);
70 $parser->parse_from_file (@ARGV);
72 __END__
74 =head1 NAME
76 pod2text - Convert POD data to formatted ASCII text
78 =head1 SYNOPSIS
80 pod2text [B<-aclost>] [B<--code>] [B<-i> I<indent>] S<[B<-q> I<quotes>]>
81 S<[B<-w> I<width>]> [I<input> [I<output>]]
83 pod2text B<-h>
85 =head1 DESCRIPTION
87 B<pod2text> is a front-end for Pod::Text and its subclasses. It uses them
88 to generate formatted ASCII text from POD source. It can optionally use
89 either termcap sequences or ANSI color escape sequences to format the text.
91 I<input> is the file to read for POD source (the POD can be embedded in
92 code). If I<input> isn't given, it defaults to STDIN. I<output>, if given,
93 is the file to which to write the formatted output. If I<output> isn't
94 given, the formatted output is written to STDOUT.
96 =head1 OPTIONS
98 =over 4
100 =item B<-a>, B<--alt>
102 Use an alternate output format that, among other things, uses a different
103 heading style and marks C<=item> entries with a colon in the left margin.
105 =item B<--code>
107 Include any non-POD text from the input file in the output as well. Useful
108 for viewing code documented with POD blocks with the POD rendered and the
109 code left intact.
111 =item B<-c>, B<--color>
113 Format the output with ANSI color escape sequences. Using this option
114 requires that Term::ANSIColor be installed on your system.
116 =item B<-i> I<indent>, B<--indent=>I<indent>
118 Set the number of spaces to indent regular text, and the default indentation
119 for C<=over> blocks. Defaults to 4 spaces if this option isn't given.
121 =item B<-h>, B<--help>
123 Print out usage information and exit.
125 =item B<-l>, B<--loose>
127 Print a blank line after a C<=head1> heading. Normally, no blank line is
128 printed after C<=head1>, although one is still printed after C<=head2>,
129 because this is the expected formatting for manual pages; if you're
130 formatting arbitrary text documents, using this option is recommended.
132 =item B<-m> I<width>, B<--left-margin>=I<width>, B<--margin>=I<width>
134 The width of the left margin in spaces. Defaults to 0. This is the margin
135 for all text, including headings, not the amount by which regular text is
136 indented; for the latter, see B<-i> option.
138 =item B<-o>, B<--overstrike>
140 Format the output with overstruck printing. Bold text is rendered as
141 character, backspace, character. Italics and file names are rendered as
142 underscore, backspace, character. Many pagers, such as B<less>, know how
143 to convert this to bold or underlined text.
145 =item B<-q> I<quotes>, B<--quotes>=I<quotes>
147 Sets the quote marks used to surround CE<lt>> text to I<quotes>. If
148 I<quotes> is a single character, it is used as both the left and right
149 quote; if I<quotes> is two characters, the first character is used as the
150 left quote and the second as the right quoted; and if I<quotes> is four
151 characters, the first two are used as the left quote and the second two as
152 the right quote.
154 I<quotes> may also be set to the special value C<none>, in which case no
155 quote marks are added around CE<lt>> text.
157 =item B<-s>, B<--sentence>
159 Assume each sentence ends with two spaces and try to preserve that spacing.
160 Without this option, all consecutive whitespace in non-verbatim paragraphs
161 is compressed into a single space.
163 =item B<-t>, B<--termcap>
165 Try to determine the width of the screen and the bold and underline
166 sequences for the terminal from termcap, and use that information in
167 formatting the output. Output will be wrapped at two columns less than the
168 width of your terminal device. Using this option requires that your system
169 have a termcap file somewhere where Term::Cap can find it and requires that
170 your system support termios. With this option, the output of B<pod2text>
171 will contain terminal control sequences for your current terminal type.
173 =item B<-w>, B<--width=>I<width>, B<->I<width>
175 The column at which to wrap text on the right-hand side. Defaults to 76,
176 unless B<-t> is given, in which case it's two columns less than the width of
177 your terminal device.
179 =back
181 =head1 DIAGNOSTICS
183 If B<pod2text> fails with errors, see L<Pod::Text> and L<Pod::Parser> for
184 information about what those errors might mean. Internally, it can also
185 produce the following diagnostics:
187 =over 4
189 =item -c (--color) requires Term::ANSIColor be installed
191 (F) B<-c> or B<--color> were given, but Term::ANSIColor could not be
192 loaded.
194 =item Unknown option: %s
196 (F) An unknown command line option was given.
198 =back
200 In addition, other L<Getopt::Long|Getopt::Long> error messages may result
201 from invalid command-line options.
203 =head1 ENVIRONMENT
205 =over 4
207 =item COLUMNS
209 If B<-t> is given, B<pod2text> will take the current width of your screen
210 from this environment variable, if available. It overrides terminal width
211 information in TERMCAP.
213 =item TERMCAP
215 If B<-t> is given, B<pod2text> will use the contents of this environment
216 variable if available to determine the correct formatting sequences for your
217 current terminal device.
219 =back
221 =head1 SEE ALSO
223 L<Pod::Text>, L<Pod::Text::Color>, L<Pod::Text::Overstrike>,
224 L<Pod::Text::Termcap>, L<Pod::Parser>
226 The current version of this script is always available from its web site at
227 L<http://www.eyrie.org/~eagle/software/podlators/>. It is also part of the
228 Perl core distribution as of 5.6.0.
230 =head1 AUTHOR
232 Russ Allbery <rra@stanford.edu>.
234 =head1 COPYRIGHT AND LICENSE
236 Copyright 1999, 2000, 2001 by Russ Allbery <rra@stanford.edu>.
238 This program is free software; you may redistribute it and/or modify it
239 under the same terms as Perl itself.
241 =cut