Pod::Man - Convert POD data to formatted *roff input
Pod::Man is a module to convert documentation in the POD format (the preferred language for documenting Perl) into *roff input using the man macro set. The resulting *roff code is suitable for display on a terminal using nroff(1), normally via man(1), or printing using troff(1). It is conventionally invoked using the driver script pod2man, but it can also be used directly.
As a derived class from Pod::Simple, Pod::Man supports the same methods and interfaces. See Pod::Simple for all the details.
new() can take options, in the form of key/value pairs that control the behavior of the parser. See below for details.
If no options are given, Pod::Man uses the name of the input file with any
.pl stripped as the man page title, to
section 1 unless the file ended in
.pm in which case it defaults to
section 3, to a centered title of "User Contributed Perl Documentation", to
a centered footer of the Perl version it is run with, and to a left-hand
footer of the modification date of its input (or the current date if given
STDIN for input).
Pod::Man assumes that your *roff formatters have a fixed-width font named
CW. If yours is called something else (like CR), use the
specify it. This generally only matters for troff output for printing.
Similarly, you can set the fonts used for bold, italic, and bold italic
Besides the obvious pod conversions, Pod::Man also takes care of formatting
func(), func(3), and simple variable references like $foo or @bar so you
don't have to use code escapes for them; complex expressions like
will still need to be escaped, though. It also translates
dashes that aren't used as hyphens into en dashes, makes long dashes--like
this--into proper em dashes, fixes "paired quotes," makes C++ look right,
puts a little space between double underbars, makes ALLCAPS a teeny bit
smaller in troff, and escapes stuff that *roff treats as special so that
you don't have to.
The recognized options to new() are as follows. All options take a single argument.
Sets the centered page header to use instead of "User Contributed Perl Documentation".
Sets the left-hand footer. By default, the modification date of the input file will be used, or the current date if stat() can't find that file (the case if the input is from STDIN), and the date will be formatted as YYYY-MM-DD.
The fixed-width font to use for vertabim text and code. Defaults to CW. Some systems may want CR instead. Only matters for troff output.
Bold version of the fixed-width font. Defaults to CB. Only matters for troff output.
Italic version of the fixed-width font (actually, something of a misnomer, since most fixed-width fonts only have an oblique version, not an italic version). Defaults to CI. Only matters for troff output.
Bold italic (probably actually oblique) version of the fixed-width font. Pod::Man doesn't assume you have this, and defaults to CB. Some systems (such as Solaris) have this font available as CX. Only matters for troff output.
Set the name of the manual page. Without this option, the manual name is
set to the uppercased base name of the file being converted unless the
manual section is 3, in which case the path is parsed to see if it is a Perl
module path. If it is, a path like
.../lib/Pod/Man.pm is converted into
a name like
. This option, if given, overrides any automatic
determination of the name.
Sets the quote marks used to surround C<> text. If the value is a single character, it is used as both the left and right quote; if it is two characters, the first character is used as the left quote and the second as the right quoted; and if it is four characters, the first two are used as the left quote and the second two as the right quote.
This may also be set to the special value
, in which case no quote
marks are added around C<> text (but the font is still changed for troff
Set the centered footer. By default, this is the version of Perl you run
Pod::Man under. Note that some system an macro sets assume that the
centered footer will be a modification date and will prepend something like
"Last modified: "; if this is the case, you may want to set
the last modified date and
to the version number.
Set the section for the
.TH macro. The standard section numbering
convention is to use 1 for user commands, 2 for system calls, 3 for
functions, 4 for devices, 5 for file formats, 6 for games, 7 for
miscellaneous information, and 8 for administrator commands. There is a lot
of variation here, however; some systems (like Solaris) use 4 for file
formats, 5 for miscellaneous information, and 7 for devices. Still others
use 1m instead of 8, or some mix of both. About the only section numbers
that are reliably consistent are 1, 2, and 3.
By default, section 1 will be used unless the file ends in .pm in which case section 3 will be selected.
The standard Pod::Simple method parse_file() takes one argument naming the POD file to read from. By default, the output is sent to STDOUT, but this can be changed with the output_fd() method.
The standard Pod::Simple method parse_from_file() takes up to two arguments, the first being the input file to read POD from and the second being the file to write the formatted output to.
You can also call parse_lines() to parse an array of lines or parse_string_document() to parse a document already in memory. To put the output into a string instead of a file handle, call the output_string() method. See Pod::Simple for the specific details.
(F) You specified a *roff font (using
, etc.) that
wasn't either one or two characters. Pod::Man doesn't support *roff fonts
longer than two characters, although some *roff extensions do (the canonical
versions of nroff and troff don't either).
(F) The quote specification given (the quotes option to the constructor) was invalid. A quote specification must be one, two, or four characters long.
Eight-bit input data isn't handled at all well at present. The correct approach would be to map E<> escapes to the appropriate UTF-8 characters and then do a translation pass on the output according to the user-specified output character set. Unfortunately, we can't send eight-bit data directly to the output unless the user says this is okay, since some vendor *roff implementations can't handle eight-bit data. If the *roff implementation can, however, that's far superior to the current hacked characters that only work under troff.
There is currently no way to turn off the guesswork that tries to format unmarked text appropriately, and sometimes it isn't wanted (particularly when using POD to document something other than Perl). Most of the work towards fixing this has now been done, however, and all that's still needed is a user interface.
The NAME section should be recognized specially and index entries emitted for everything in that section. This would have to be deferred until the next section, since extraneous things in NAME tends to confuse various man page processors. Currently, no index entries are emitted for anything in NAME.
Pod::Man doesn't handle font names longer than two characters. Neither do most troff implementations, but GNU troff does as an extension. It would be nice to support as an option for those who want to use it.
The preamble added to each output file is rather verbose, and most of it is only necessary in the presence of non-ASCII characters. It would ideally be nice if all of those definitions were only output if needed, perhaps on the fly as the characters are used.
Pod::Man is excessively slow.
The handling of hyphens and em dashes is somewhat fragile, and one may get the wrong one under some circumstances. This should only matter for troff output.
When and whether to use small caps is somewhat tricky, and Pod::Man doesn't necessarily get it right.
Converting neutral double quotes to properly matched double quotes doesn't work unless there are no formatting codes between the quote marks. This only matters for troff output.
Russ Allbery <email@example.com>, based very heavily on the original pod2man by Tom Christiansen <firstname.lastname@example.org>. The modifications to work with Pod::Simple instead of Pod::Parser were originally contributed by Sean Burke (but I've since hacked them beyond recognition and all bugs are mine).
Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 by Russ Allbery <email@example.com>.
This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.
Pod::Simple, perlpod(1), pod2man(1), nroff(1), troff(1), man(1), man(7)
Ossanna, Joseph F., and Brian W. Kernighan. "Troff User's Manual," Computing Science Technical Report No. 54, AT&T Bell Laboratories. This is the best documentation of standard nroff and troff. At the time of this writing, it's available at http://www.cs.bell-labs.com/cm/cs/cstr.html.
The man page documenting the man macro set may be man(5) instead of man(7) on your system. Also, please see pod2man(1) for extensive documentation on writing manual pages if you've not done it before and aren't familiar with the conventions.
The current version of this module is always available from its web site at http://www.eyrie.org/~eagle/software/podlators/. It is also part of the Perl core distribution as of 5.6.0.