#!/usr/bin/perl

=head1 NAME

dh_installman - install man pages into package build directories

=cut

use strict;
use warnings;
use File::Find;
use Debian::Debhelper::Dh_Lib;

=head1 SYNOPSIS

B<dh_installman> [S<I<debhelper options>>] [S<I<manpage> ...>]

=head1 DESCRIPTION

B<dh_installman> is a debhelper program that handles installing
man pages into the correct locations in package build directories. You tell
it what man pages go in your packages, and it figures out where to install
them based on the section field in their B<.TH> or B<.Dt> line. If you have
a properly formatted B<.TH> or B<.Dt> line, your man page will be installed
into the right directory, with the right name (this includes proper handling
of pages with a subsection, like B<3perl>, which are placed in F<man3>, and
given an extension of F<.3perl>). If your B<.TH> or B<.Dt> line is incorrect
or missing, the program may guess wrong based on the file extension.

It also supports translated man pages, by looking for extensions
like F<.ll.8> and F<.ll_LL.8>, or by use of the B<--language> switch.

If B<dh_installman> seems to install a man page into the wrong section or with
the wrong extension, this is because the man page has the wrong section
listed in its B<.TH> or B<.Dt> line. Edit the man page and correct the
section, and B<dh_installman> will follow suit. See L<man(7)> for details
about the B<.TH> section, and L<mdoc(7)> for the B<.Dt> section. If
B<dh_installman> seems to install a man page into a directory
like F</usr/share/man/pl/man1/>, that is because your program has a
name like F<foo.pl>, and B<dh_installman> assumes that means it is translated
into Polish. Use B<--language=C> to avoid this.

After the man page installation step, B<dh_installman> will check to see if
any of the man pages in the temporary directories of any of the packages it
is acting on contain F<.so> links. If so, it changes them to symlinks.

Also, B<dh_installman> will use man to guess the character encoding of each
manual page and convert it to UTF-8. If the guesswork fails for some
reason, you can override it using an encoding declaration. See
L<manconv(1)> for details.

=head1 FILES

=over 4

=item debian/I<package>.manpages

Lists man pages to be installed.

=back

=head1 OPTIONS

=over 4

=item B<-A>, B<--all>

Install all files specified by command line parameters in ALL packages
acted on.

=item B<--language=>I<ll>

Use this to specify that the man pages being acted on are written in the
specified language.

=item I<manpage> ...

Install these man pages into the first package acted on. (Or in all
packages if B<-A> is specified).

=back

=head1 NOTES

An older version of this program, L<dh_installmanpages(1)>, is still used
by some packages, and so is still included in debhelper.
It is, however, deprecated, due to its counterintuitive and inconsistent
interface. Use this program instead.

=cut

init(options => {
	"language=s" => \$dh{LANGUAGE},
});

my @sofiles;
my @sodests;

# PROMISE: DH NOOP WITHOUT manpages tmp(usr/share/man)

foreach my $package (@{$dh{DOPACKAGES}}) {
	next if is_udeb($package);

	my $tmp=tmpdir($package);
	my $file=pkgfile($package,"manpages");
	my @manpages;

	@manpages=filearray($file, ".") if $file;

	if (($package eq $dh{FIRSTPACKAGE} || $dh{PARAMS_ALL}) && @ARGV) {
		push @manpages, @ARGV;
	}

	foreach my $page (@manpages) {
		my $basename=basename($page);

		# Support compressed pages.
		my $gz='';
		if ($basename=~m/(.*)(\.gz)/) {
			$basename=$1;
			$gz=$2;
		}

		my ($fd, $section);
		# See if there is a .TH or .Dt entry in the man page. If so,
		# we'll pull the section field from that.
		if ($gz) {
			$fd = open_gz($page) or die "$page: $!";
		}
		else {
			open($fd, '<', $page) or die "$page: $!";
		}
		while (<$fd>) {
			if (/^\.TH\s+\S+\s+"?(\d+[^"\s]*)"?/ ||
			    /^\.Dt\s+\S+\s+(\d+[^\s]*)/) {
				$section=$1;
				last;
			}
		}
		close($fd);
		# Failing that, we can try to get it from the filename.
		if (! $section) {
			($section)=$basename=~m/\.([1-9]\S*)/;
		}

		# Now get the numeric component of the section.
		my ($realsection)=$section=~m/^(\d)/ if defined $section;
		if (! $realsection) {
			error("Could not determine section for $page");
		}
		
		# Get the man page's name -- everything up to the last dot.
		my ($instname)=$basename=~m/^(.*)\./;
	
		my $destdir="$tmp/usr/share/man/man$realsection/";
		my $langcode;
		if (! defined $dh{LANGUAGE} || ! exists $dh{LANGUAGE}) {
			# Translated man pages are typically specified by adding the
			# language code to the filename, so detect that and
			# redirect to appropriate directory, stripping the code.
			($langcode)=$basename=~m/\.([a-z][a-z](?:_[A-Z][A-Z])?)\.(?:[1-9]|man)/;
		}
		elsif ($dh{LANGUAGE} ne 'C') {
			$langcode=$dh{LANGUAGE};
		}
		
		if (defined $langcode && $langcode ne '') {
			# Strip the language code from the instname.
			$instname=~s/\.$langcode$//;
		}
		
		if (defined $langcode && $langcode ne '') {
			$destdir="$tmp/usr/share/man/$langcode/man$realsection/";
		}
		$destdir=~tr:/:/:s; # just for looks
		my $instpage="$destdir$instname.$section";

		next if -l $instpage;
		next if compat(5) && -e $instpage;

		if (! -d $destdir) {
			install_dir($destdir);
		}
		if ($gz) {
			complex_doit "zcat \Q$page\E > \Q$instpage\E";
		}
		else {
			install_file($page, $instpage);
		}
	}

	# Now the .so conversion.
	@sofiles=@sodests=();
	foreach my $dir (qw{usr/share/man}) {
		if (-e "$tmp/$dir") {
			find(\&find_so_man, "$tmp/$dir");
		}
	}
	foreach my $sofile (@sofiles) {
		my $sodest=shift(@sodests);
		doit "rm","-f",$sofile;
		doit "ln","-sf",$sodest,$sofile;
	}

	# Now utf-8 conversion.
	if (defined `man --version`) {
		foreach my $dir (qw{usr/share/man}) {
			next unless -e "$tmp/$dir";
			find(sub {
				return if ! -f $_ || -l $_;
				my ($tmp, $orig)=($_.".new", $_);
				complex_doit "man --recode UTF-8 ./\Q$orig\E > \Q$tmp\E";
				# recode uncompresses compressed pages
				doit "rm", "-f", $orig if s/\.(gz|Z)$//;
				doit "chmod", 644, $tmp;
				doit "mv", "-f", $tmp, $_;
			}, "$tmp/$dir");
		}
	}
}

# Check if a file is a .so man page, for use by File::Find.
sub find_so_man {
	# The -s test is because a .so file tends to be small. We don't want
	# to open every man page. 1024 is arbitrary.
	if (! -f $_ || -s $_ > 1024 || -s == 0) {
		return;
	}

	# Test first line of file for the .so thing.
	my $fd;
	if (/\.gz$/) {
		$fd = open_gz($_) or die "$_: $!";
	}
	else {
		open($fd, '<', $_) || die "$_: $!";
	}
	my $l = <$fd>;
	close($fd);

	if (! defined $l) {
		error("failed to read $_");
	}
	
	if ($l=~m/\.so\s+(.*)\s*/) {
		my $solink=$1;
		# This test is here to prevent links like ... man8/../man8/foo.8
		if (basename($File::Find::dir) eq
		    dirname($solink)) {
			$solink=basename($solink);
		}
		# A so link with a path is relative to the base of the man
		# page hierarchy, but without a path, is relative to the
		# current section.
		elsif ($solink =~ m!/!) {
			$solink="../$solink";
		}
	
		if (-e $solink || -e "$solink.gz") {
			push @sofiles,"$File::Find::dir/$_";
			push @sodests,$solink;
		}
	}
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut

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