#!/usr/bin/perl -w

=head1 NAME

dh_installdocs - install documentation into package build directories

=cut

use strict;
use Debian::Debhelper::Dh_Lib;

=head1 SYNOPSIS

B<dh_installdocs> [S<I<debhelper options>>] [B<-A>] [B<-X>I<item>] [S<I<file ...>>]

=head1 DESCRIPTION

dh_installdocs is a debhelper program that is responsible for installing
documentation into usr/share/doc/package in package build directories.

=head1 FILES

=over 4

=item debian/I<package>.docs

List documentation files to be installed into I<package>.

=item debian/copyright

=item debian/README.Debian

=item debian/TODO

=item debian/I<package>.copyright

=item debian/I<package>.README.Debian

=item debian/I<package>.TODO

Each of these files is automatically installed if present. Use the package
specific name if I<package> needs a different version of the file.

Note that debian/README.debian is also installed as README.Debian,
and debian/TODO will be installed as TODO.Debian in non-native packages.

=item debian/I<package>.doc-base

Installed as doc-base control files. Note that the doc-id will be
determined from the "Document:" entry in the doc-base control file in
question.

=item debian/I<package>.doc-base.*

If your package needs to register more than one document, you need multiple
doc-base files, and can name them like this.

=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<-Xitem>, B<--exclude=item>

Exclude files that contain "item" anywhere in their filename from
being installed. Note that this includes doc-base files.

=item B<--link-doc=>I<package>

Make the documentation directory of all packages acted on be a symlink to
the documentation directory of I<package>. This has no effect when acting on
I<package> itself, or if the documentation directory to be created already
exists when B<dh_installdocs> is run. To comply with policy, I<package> must
be a binary package that comes from the same source package.

debhelper will try to avoid installing files into linked documentation
directories that would cause conflicts with the linked package. The B<-A>
option will have no effect on packages with linked documentation
directories, and copyright, changelog, README.Debian, and TODO files will
not be installed.

(An older method to accomplish the same thing, which is still supported,
is to make the documentation directory of a package be a dangling symlink,
before calling dh_installdocs.)

=item I<file ...>

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

=back

=head1 EXAMPLES

This is an example of a debian/package.docs file:

  README
  TODO
  debian/notes-for-maintainers.txt
  docs/manual.txt
  docs/manual.pdf
  docs/manual-html/

=head1 NOTES

Note that dh_installdocs will happily copy entire directory hierarchies if
you ask it to (similar to cp -a). If it is asked to install a
directory, it will install the complete contents of the directory.

Note that this command is not idempotent. L<dh_prep(1)> should be called
between invocations of this command. Otherwise, it may cause multiple
instances of the same text to be added to maintainer scripts.

=cut

my %docdir_created;
# Create documentation directories on demand. This allows us to use dangling
# symlinks for linked documentation directories unless additional files need
# to be installed.
sub ensure_docdir {
	my $package=shift;
	return if $docdir_created{$package};
	my $tmp=tmpdir($package);

	my $target;
	if ($dh{LINK_DOC} && $dh{LINK_DOC} ne $package) {
		$target="$tmp/usr/share/doc/$dh{LINK_DOC}";
	}
	else {
		$target="$tmp/usr/share/doc/$package";
	}

	# If this is a symlink, leave it alone.
	if (! -d $target && ! -l $target) {
		doit("install","-g",0,"-o",0,"-d",$target);
	}
	$docdir_created{$package}=1;
}

init(options => {
	"link-doc=s" => \$dh{LINK_DOC},
});

foreach my $package (@{$dh{DOPACKAGES}}) {
	next if is_udeb($package);
	
	my $tmp=tmpdir($package);
	my $file=pkgfile($package,"docs");
	my $link_doc=($dh{LINK_DOC} && $dh{LINK_DOC} ne $package);

	if ($link_doc) {
		# Make sure that the parent directory exists.
		if (! -d "$tmp/usr/share/doc" && ! -l "$tmp/usr/share/doc") {
			doit("install","-g",0,"-o",0,"-d","$tmp/usr/share/doc");
		}
		# Create symlink to another documentation directory if
		# necessary.
		if (! -d "$tmp/usr/share/doc/$package" &&
		    ! -l "$tmp/usr/share/doc/$package") {
			doit("ln", "-sf", $dh{LINK_DOC}, "$tmp/usr/share/doc/$package");
			# Policy says that if you make your documentation
			# directory a symlink, then you have to depend on
			# the target.
			addsubstvar($package, "misc:Depends", $dh{LINK_DOC});
		}
	}
	else {
		ensure_docdir($package);
	}

	my @docs;

	if ($file) {
		@docs=filearray($file, ".");
	}

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

	if (@docs) {
		my $exclude = '';
		if ($dh{EXCLUDE_FIND}) {
			$exclude .= ' -and ! \( '.$dh{EXCLUDE_FIND}.' \)';
		}
		if (! compat(4)) {
			# ignore empty files in subdirs
			$exclude .= ' -and ! -empty';
		}
		foreach my $doc (@docs) {
			next if excludefile($doc);
			next if -e $doc && ! -s $doc && ! compat(4); # ignore empty files
			ensure_docdir($package);
			if (-d $doc && length $exclude) {
				my $basename = basename($doc);
				my $dir = ($basename eq '.') ? $doc : "$doc/..";
				my $pwd=`pwd`;
				chomp $pwd;
				complex_doit("cd '$dir' && find '$basename' \\( -type f -or -type l \\)$exclude -exec cp --parents -dp {} $pwd/$tmp/usr/share/doc/$package \\;");
			}
			else {
				doit("cp", "-a", $doc, "$tmp/usr/share/doc/$package");
			}
		}
		doit("chown","-R","0:0","$tmp/usr/share/doc");
		doit("chmod","-R","go=rX","$tmp/usr/share/doc");
		doit("chmod","-R","u+rw","$tmp/usr/share/doc");
	}

	# .Debian is correct, according to policy, but I'm easy.
	my $readme_debian=pkgfile($package,'README.Debian');
	if (! $readme_debian) {
		$readme_debian=pkgfile($package,'README.debian');
	}
	if (! $link_doc && $readme_debian && ! excludefile($readme_debian)) {
		ensure_docdir($package);
		doit("install","-g",0,"-o",0,"-m","644","-p","$readme_debian",
			"$tmp/usr/share/doc/$package/README.Debian");
	}

	my $todo=pkgfile($package,'TODO');
	if (! $link_doc && $todo && ! excludefile($todo)) {
		ensure_docdir($package);
		if (isnative($package)) {
			doit("install","-g",0,"-o",0,"-m","644","-p",$todo,
				"$tmp/usr/share/doc/$package/TODO");
		}
		else {
			doit("install","-g",0,"-o",0,"-m","644","-p",$todo,
				"$tmp/usr/share/doc/$package/TODO.Debian");
		}
	}

	# If the "directory" is a dangling symlink, then don't install
	# the copyright file. This is useful for multibinary packages 
	# that share a doc directory.
	if (! $link_doc && (! -l "$tmp/usr/share/doc/$package" || -d "$tmp/usr/share/doc/$package")) {
		# Support debian/package.copyright, but if not present, fall
		# back on debian/copyright for all packages, not just the 
		# main binary package.
		my $copyright=pkgfile($package,'copyright');
		if (! $copyright && -e "debian/copyright") {
			$copyright="debian/copyright";
		}
		if ($copyright && ! excludefile($copyright)) {
			ensure_docdir($package);
			doit("install","-g",0,"-o",0,"-m","644","-p",$copyright,
				"$tmp/usr/share/doc/$package/copyright");
		}
	}

	# Handle doc-base files. There are two filename formats, the usual
	# plus an extended format (debian/package.*).
	my %doc_ids;
	
	opendir(DEB,"debian/") || error("can't read debian directory: $!");
	# If this is the main package, we need to handle unprefixed filenames.
	# For all packages, we must support both the usual filename format plus
	# that format with a period an something appended.
	my $regexp="\Q$package\E\.";
	if ($package eq $dh{MAINPACKAGE}) {
		$regexp="(|$regexp)";
	}
	foreach my $fn (grep {/^${regexp}doc-base(\..*)?$/} readdir(DEB)) {
		# .EX are example files, generated by eg, dh-make
		next if $fn=~/\.EX$/;
		next if excludefile($fn);
		# Parse the file to get the doc id.
		open (IN, "debian/$fn") || die "Cannot read debian/$fn.";
		while (<IN>) {
			s/\s*$//;
			if (/^Document\s*:\s*(.*)/) {
				$doc_ids{$fn}=$1;
				last;
			}
		}
		if (! exists $doc_ids{$fn}) {
			warning("Could not parse $fn for doc-base Document id; skipping");
		}
		close IN;
	}
	closedir(DEB);
	
	if (%doc_ids) {
		if (! -d "$tmp/usr/share/doc-base/") {
			doit("install","-g",0,"-o",0,"-d","$tmp/usr/share/doc-base/");
		}
	}
	foreach my $fn (keys %doc_ids) {
		doit("install","-g",0,"-o",0,"-m644","-p","debian/$fn",
		     "$tmp/usr/share/doc-base/$doc_ids{$fn}");
	}
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut