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#!/usr/bin/perl

=head1 NAME

dh_installmanpages - old-style man page installer (deprecated)

=cut

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

our $VERSION = DH_BUILTIN_VERSION;

=head1 SYNOPSIS

B<dh_installmanpages> [S<I<debhelper options>>] [S<I<file> ...>]

=head1 DESCRIPTION

B<dh_installmanpages> is a debhelper program that is responsible for
automatically installing man pages into F<usr/share/man/>
in package build directories.

This is a DWIM-style program, with an interface unlike the rest of
debhelper. It is deprecated, and you are encouraged to use
L<dh_installman(1)> instead.

B<dh_installmanpages> scans the current directory and all subdirectories for
filenames that look like man pages. (Note that only real files are looked
at; symlinks are ignored.) It uses L<file(1)> to verify that the files are
in the correct format. Then, based on the files' extensions, it installs 
them into the correct man directory.

All filenames specified as parameters will be skipped by B<dh_installmanpages>.
This is useful if by default it installs some man pages that you do not
want to be installed.

After the man page installation step, B<dh_installmanpages> will check to see
if any of the man pages are F<.so> links. If so, it changes them to symlinks.

=head1 OPTIONS

=over 4

=item I<file> ...

Do not install these files as man pages, even if they look like valid man
pages.

=back

=head1 BUGS

B<dh_installmanpages> will install the man pages it finds into B<all> packages
you tell it to act on, since it can't tell what package the man
pages belong in. This is almost never what you really want (use B<-p> to work
around this, or use the much better L<dh_installman(1)> program instead).

Files ending in F<.man> will be ignored.

Files specified as parameters that contain spaces in their filenames will
not be processed properly.

=cut

warning("This program is deprecated, switch to dh_installman.");

init();

# Check if a file is a man page, for use by File::Find.
my @manpages;
my @allpackages;
sub find_man {
	# Does its filename look like a man page?
	# .ex files are examples installed by deb-make,
	# we don't want those, or .in files, which are
	# from configure, nor do we want CVS .#* files.
	if (! (-f $_ && /^.*\.[1-9].*$/ && ! /\.(ex|in)$/ && ! /^\.#/)) {
		return;
	}
	
	# It's not in a tmp directory is it?
	if ($File::Find::dir=~m:debian/.*tmp.*:) {
		return;
	}
	foreach my $dir (@allpackages) {
		if ($File::Find::dir=~m:debian/\Q$dir\E:) {
			return;
		}
	}
	
	# And file does think it's a real man page?
	my $type=`file -z $_`;
	if ($type !~ m/:.*roff/) {
		return;
	}

	# Good enough.
	push @manpages,"$File::Find::dir/$_";
}

# Check if a file is a .so man page, for use by File::Find.
my @sofiles;
my @sodests;
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) {
		return;
	}

	# Test first line of file for the .so thing.
	open(my $fd, '<', $_);
	my $l = <$fd>;
	close($fd);
	if ($l=~m/\.so\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);
		}
		else {
			$solink="../$solink";
		}
	
		push @sofiles,"$File::Find::dir/$_";
		push @sodests,$solink;
	}
}

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

	my $tmp=tmpdir($package);

	# Find all filenames that look like man pages.
	@manpages=();
	@allpackages=getpackages() if not @allpackages;
	find(\&find_man,'.'); # populates @manpages
	
	foreach my $page (@manpages) {
		$page=~s:^\./::; # just for looks
		
		my $basename=basename($page);
		
		# Skip all files listed on command line.
		my $install=1;
		foreach my $skip (@ARGV) {
			# Look at basename of what's on connect line
			# for backwards compatibility.
			if ($basename eq basename($skip)) {
				$install=undef;
				last;
			}
		}
		
		if ($install) {
			my $extdir="share";
			
			my ($section)=$basename=~m/\.([1-9])/;
			
			my $destdir="$tmp/usr/$extdir/man/man$section/";
			
			# Handle translated man pages.
			my $instname=$basename;
			my ($langcode)=$basename=~m/\.([a-z][a-z])\.([1-9])/;
			if (defined $langcode && $langcode ne '') {
				$destdir="$tmp/usr/$extdir/man/$langcode/man$section/";
				$instname=~s/\.$langcode\./\./;
			}

			$destdir=~tr:/:/:s; # just for looks

			if (! -e "$destdir/$basename" && !-l "$destdir/$basename") {
				install_dir($destdir);
				install_file($page,$destdir.$instname);
			}
		}
	}

	# 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;
	}
}

=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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