From: intrigeri <intrigeri@boum.org>
Date: Mon, 10 Nov 2008 14:41:29 +0000 (+0100)
Subject: Merge commit 'upstream/master' into prv/po
X-Git-Tag: 3.15~366
X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/commitdiff_plain/812f775e0a3cd953782edcbe8a0eb727752df03f?hp=02ee6d40d403eac396cead15900b1441e3fe08d7

Merge commit 'upstream/master' into prv/po
---

diff --git a/IkiWiki/Plugin/po.pm b/IkiWiki/Plugin/po.pm
new file mode 100644
index 000000000..0666142cb
--- /dev/null
+++ b/IkiWiki/Plugin/po.pm
@@ -0,0 +1,762 @@
+#!/usr/bin/perl
+# .po as a wiki page type
+# Licensed under GPL v2 or greater
+# Copyright (C) 2008 intrigeri <intrigeri@boum.org>
+# inspired by the GPL'd po4a-translate,
+# which is Copyright 2002, 2003, 2004 by Martin Quinson (mquinson#debian.org)
+package IkiWiki::Plugin::po;
+
+use warnings;
+use strict;
+use IkiWiki 2.00;
+use Encode;
+use Locale::Po4a::Chooser;
+use Locale::Po4a::Po;
+use File::Basename;
+use File::Copy;
+use File::Spec;
+use File::Temp;
+use Memoize;
+use UNIVERSAL;
+
+my %translations;
+my @origneedsbuild;
+
+memoize("_istranslation");
+memoize("percenttranslated");
+# FIXME: memoizing istranslatable() makes some test cases fail once every
+# two tries; this may be related to the artificial way the testsuite is
+# run, or not.
+# memoize("istranslatable");
+
+# backup references to subs that will be overriden
+my %origsubs;
+
+sub import { #{{{
+	hook(type => "getsetup", id => "po", call => \&getsetup);
+	hook(type => "checkconfig", id => "po", call => \&checkconfig);
+	hook(type => "needsbuild", id => "po", call => \&needsbuild);
+	hook(type => "scan", id => "po", call => \&scan, last =>1);
+	hook(type => "filter", id => "po", call => \&filter);
+	hook(type => "htmlize", id => "po", call => \&htmlize);
+	hook(type => "pagetemplate", id => "po", call => \&pagetemplate, last => 1);
+	hook(type => "change", id => "po", call => \&change);
+	hook(type => "editcontent", id => "po", call => \&editcontent);
+
+	$origsubs{'bestlink'}=\&IkiWiki::bestlink;
+	inject(name => "IkiWiki::bestlink", call => \&mybestlink);
+	$origsubs{'beautify_urlpath'}=\&IkiWiki::beautify_urlpath;
+	inject(name => "IkiWiki::beautify_urlpath", call => \&mybeautify_urlpath);
+	$origsubs{'targetpage'}=\&IkiWiki::targetpage;
+	inject(name => "IkiWiki::targetpage", call => \&mytargetpage);
+	$origsubs{'urlto'}=\&IkiWiki::urlto;
+	inject(name => "IkiWiki::urlto", call => \&myurlto);
+} #}}}
+
+sub getsetup () { #{{{
+	return
+		plugin => {
+			safe => 0,
+			rebuild => 1, # format plugin & changes html filenames
+		},
+		po_master_language => {
+			type => "string",
+			example => {
+				'code' => 'en',
+				'name' => 'English'
+			},
+			description => "master language (non-PO files)",
+			safe => 1,
+			rebuild => 1,
+		},
+		po_slave_languages => {
+			type => "string",
+			example => {
+				'fr' => 'Français',
+				'es' => 'Castellano',
+				'de' => 'Deutsch'
+			},
+			description => "slave languages (PO files)",
+			safe => 1,
+			rebuild => 1,
+		},
+		po_translatable_pages => {
+			type => "pagespec",
+			example => "!*/Discussion",
+			description => "PageSpec controlling which pages are translatable",
+			link => "ikiwiki/PageSpec",
+			safe => 1,
+			rebuild => 1,
+		},
+		po_link_to => {
+			type => "string",
+			example => "current",
+			description => "internal linking behavior (default/current/negotiated)",
+			safe => 1,
+			rebuild => 1,
+		},
+} #}}}
+
+sub islanguagecode ($) { #{{{
+    my $code=shift;
+    return ($code =~ /^[a-z]{2}$/);
+} #}}}
+
+sub checkconfig () { #{{{
+	foreach my $field (qw{po_master_language po_slave_languages}) {
+		if (! exists $config{$field} || ! defined $config{$field}) {
+			error(sprintf(gettext("Must specify %s"), $field));
+		}
+	}
+	if (! (keys %{$config{po_slave_languages}})) {
+		error(gettext("At least one slave language must be defined in po_slave_languages"));
+	}
+	map {
+		islanguagecode($_)
+			or error(sprintf(gettext("%s is not a valid language code"), $_));
+	} ($config{po_master_language}{code}, keys %{$config{po_slave_languages}});
+	if (! exists $config{po_translatable_pages} ||
+	    ! defined $config{po_translatable_pages}) {
+		$config{po_translatable_pages}="";
+	}
+	if (! exists $config{po_link_to} ||
+	    ! defined $config{po_link_to}) {
+		$config{po_link_to}='default';
+	}
+	elsif (! grep {
+			$config{po_link_to} eq $_
+		} ('default', 'current', 'negotiated')) {
+		warn(sprintf(gettext('po_link_to=%s is not a valid setting, falling back to po_link_to=default'),
+				$config{po_link_to}));
+		$config{po_link_to}='default';
+	}
+	elsif ($config{po_link_to} eq "negotiated" && ! $config{usedirs}) {
+		warn(gettext('po_link_to=negotiated requires usedirs to be enabled, falling back to po_link_to=default'));
+		$config{po_link_to}='default';
+	}
+	push @{$config{wiki_file_prune_regexps}}, qr/\.pot$/;
+} #}}}
+
+sub otherlanguages($) { #{{{
+	my $page=shift;
+
+	my %ret;
+	if (istranslatable($page)) {
+		%ret = %{$translations{$page}};
+	}
+	elsif (istranslation($page)) {
+		my ($masterpage, $curlang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+		$ret{$config{po_master_language}{code}} = $masterpage;
+		foreach my $lang (sort keys %{$translations{$masterpage}}) {
+			next if $lang eq $curlang;
+			$ret{$lang} = $translations{$masterpage}{$lang};
+		}
+	}
+	return \%ret;
+} #}}}
+
+sub potfile ($) { #{{{
+	my $masterfile=shift;
+
+	(my $name, my $dir, my $suffix) = fileparse($masterfile, qr/\.[^.]*/);
+	$dir='' if $dir eq './';
+	return File::Spec->catpath('', $dir, $name . ".pot");
+} #}}}
+
+sub pofile ($$) { #{{{
+	my $masterfile=shift;
+	my $lang=shift;
+
+	(my $name, my $dir, my $suffix) = fileparse($masterfile, qr/\.[^.]*/);
+	$dir='' if $dir eq './';
+	return File::Spec->catpath('', $dir, $name . "." . $lang . ".po");
+} #}}}
+
+sub pofiles ($) { #{{{
+	my $masterfile=shift;
+	return map pofile($masterfile, $_), (keys %{$config{po_slave_languages}});
+} #}}}
+
+sub refreshpot ($) { #{{{
+	my $masterfile=shift;
+
+	my $potfile=potfile($masterfile);
+	my %options = ("markdown" => (pagetype($masterfile) eq 'mdwn') ? 1 : 0);
+	my $doc=Locale::Po4a::Chooser::new('text',%options);
+	$doc->{TT}{utf_mode} = 1;
+	$doc->{TT}{file_in_charset} = 'utf-8';
+	$doc->{TT}{file_out_charset} = 'utf-8';
+	$doc->read($masterfile);
+	# let's cheat a bit to force porefs option to be passed to Locale::Po4a::Po;
+	# this is undocument use of internal Locale::Po4a::TransTractor's data,
+	# compulsory since this module prevents us from using the porefs option.
+	my %po_options = ('porefs' => 'none');
+	$doc->{TT}{po_out}=Locale::Po4a::Po->new(\%po_options);
+	$doc->{TT}{po_out}->set_charset('utf-8');
+	# do the actual work
+	$doc->parse;
+	IkiWiki::prep_writefile(basename($potfile),dirname($potfile));
+	$doc->writepo($potfile);
+} #}}}
+
+sub refreshpofiles ($@) { #{{{
+	my $masterfile=shift;
+	my @pofiles=@_;
+
+	my $potfile=potfile($masterfile);
+	error("[po/refreshpofiles] POT file ($potfile) does not exist") unless (-e $potfile);
+
+	foreach my $pofile (@pofiles) {
+		IkiWiki::prep_writefile(basename($pofile),dirname($pofile));
+		if (-e $pofile) {
+			system("msgmerge", "-U", "--backup=none", $pofile, $potfile) == 0
+				or error("[po/refreshpofiles:$pofile] failed to update");
+		}
+		else {
+			File::Copy::syscopy($potfile,$pofile)
+				or error("[po/refreshpofiles:$pofile] failed to copy the POT file");
+		}
+	}
+} #}}}
+
+sub buildtranslationscache() { #{{{
+	# use istranslation's side-effect
+	map istranslation($_), (keys %pagesources);
+} #}}}
+
+sub resettranslationscache() { #{{{
+	undef %translations;
+} #}}}
+
+sub needsbuild () { #{{{
+	my $needsbuild=shift;
+
+	# backup @needsbuild content so that change() can know whether
+	# a given master page was rendered because its source file was changed
+	@origneedsbuild=(@$needsbuild);
+
+	buildtranslationscache();
+
+	# make existing translations depend on the corresponding master page
+	foreach my $master (keys %translations) {
+		map add_depends($_, $master), values %{otherlanguages($master)};
+	}
+} #}}}
+
+sub scan (@) { #{{{
+	my %params=@_;
+	my $page=$params{page};
+	my $content=$params{content};
+
+	return unless UNIVERSAL::can("IkiWiki::Plugin::link", "import");
+
+	if (istranslation($page)) {
+		my ($masterpage, $curlang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+		foreach my $destpage (@{$links{$page}}) {
+			if (istranslatable($destpage)) {
+				# replace one occurence of $destpage in $links{$page}
+				# (we only want to replace the one that was added by
+				# IkiWiki::Plugin::link::scan, other occurences may be
+				# there for other reasons)
+				for (my $i=0; $i<@{$links{$page}}; $i++) {
+					if (@{$links{$page}}[$i] eq $destpage) {
+						@{$links{$page}}[$i] = $destpage . '.' . $curlang;
+						last;
+					}
+				}
+			}
+		}
+	}
+	elsif (! istranslatable($page) && ! istranslation($page)) {
+		foreach my $destpage (@{$links{$page}}) {
+			if (istranslatable($destpage)) {
+				map {
+					push @{$links{$page}}, $destpage . '.' . $_;
+				} (keys %{$config{po_slave_languages}});
+			}
+		}
+	}
+} #}}}
+
+sub mytargetpage ($$) { #{{{
+	my $page=shift;
+	my $ext=shift;
+
+	if (istranslation($page)) {
+		my ($masterpage, $lang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+		if (! $config{usedirs} || $masterpage eq 'index') {
+			return $masterpage . "." . $lang . "." . $ext;
+		}
+		else {
+			return $masterpage . "/index." . $lang . "." . $ext;
+		}
+	}
+	elsif (istranslatable($page)) {
+		if (! $config{usedirs} || $page eq 'index') {
+			return $page . "." . $config{po_master_language}{code} . "." . $ext;
+		}
+		else {
+			return $page . "/index." . $config{po_master_language}{code} . "." . $ext;
+		}
+	}
+	return $origsubs{'targetpage'}->($page, $ext);
+} #}}}
+
+sub mybeautify_urlpath ($) { #{{{
+	my $url=shift;
+
+	my $res=$origsubs{'beautify_urlpath'}->($url);
+	if ($config{po_link_to} eq "negotiated") {
+		$res =~ s!/\Qindex.$config{po_master_language}{code}.$config{htmlext}\E$!/!;
+	}
+	return $res;
+} #}}}
+
+sub urlto_with_orig_beautiful_urlpath($$) { #{{{
+	my $to=shift;
+	my $from=shift;
+
+	inject(name => "IkiWiki::beautify_urlpath", call => $origsubs{'beautify_urlpath'});
+	my $res=urlto($to, $from);
+	inject(name => "IkiWiki::beautify_urlpath", call => \&mybeautify_urlpath);
+
+	return $res;
+} #}}}
+
+sub myurlto ($$;$) { #{{{
+	my $to=shift;
+	my $from=shift;
+	my $absolute=shift;
+
+	# workaround hard-coded /index.$config{htmlext} in IkiWiki::urlto()
+	if (! length $to
+	    && $config{po_link_to} eq "current"
+	    && istranslation($from)
+	    && istranslatable('index')) {
+		my ($masterpage, $curlang) = ($from =~ /(.*)[.]([a-z]{2})$/);
+		return IkiWiki::beautify_urlpath(IkiWiki::baseurl($from) . "index." . $curlang . ".$config{htmlext}");
+	}
+	return $origsubs{'urlto'}->($to,$from,$absolute);
+} #}}}
+
+sub mybestlink ($$) { #{{{
+	my $page=shift;
+	my $link=shift;
+
+	my $res=$origsubs{'bestlink'}->($page, $link);
+	if (length $res) {
+		if ($config{po_link_to} eq "current"
+		    && istranslatable($res)
+		    && istranslation($page)) {
+			my ($masterpage, $curlang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+			return $res . "." . $curlang;
+		}
+		else {
+			return $res;
+		}
+	}
+	return "";
+} #}}}
+
+# blackbox for %filtered
+{
+	my %filtered;
+
+	sub alreadyfiltered($$) { #{{{
+		my $page=shift;
+		my $destpage=shift;
+
+		return ( exists $filtered{$page}{$destpage}
+			 && $filtered{$page}{$destpage} eq 1 );
+	} #}}}
+
+	sub setalreadyfiltered($$) { #{{{
+		my $page=shift;
+		my $destpage=shift;
+
+		$filtered{$page}{$destpage}=1;
+	} #}}}
+
+	sub unsetalreadyfiltered($$) { #{{{
+		my $page=shift;
+		my $destpage=shift;
+
+		if (exists $filtered{$page}{$destpage}) {
+			delete $filtered{$page}{$destpage};
+		}
+	} #}}}
+
+	sub resetalreadyfiltered() { #{{{
+		undef %filtered;
+	} #}}}
+}
+
+# We use filter to convert PO to the master page's format,
+# since the rest of ikiwiki should not work on PO files.
+sub filter (@) { #{{{
+	my %params = @_;
+
+	my $page = $params{page};
+	my $destpage = $params{destpage};
+	my $content = decode_utf8(encode_utf8($params{content}));
+
+	return $content if ( ! istranslation($page)
+			     || alreadyfiltered($page, $destpage) );
+
+	# CRLF line terminators make poor Locale::Po4a feel bad
+	$content=~s/\r\n/\n/g;
+
+	# Implementation notes
+	#
+	# 1. Locale::Po4a reads/writes from/to files, and I'm too lazy
+	#    to learn how to disguise a variable as a file.
+	# 2. There are incompatibilities between some File::Temp versions
+	#    (including 0.18, bundled with Lenny's perl-modules package)
+	#    and others (e.g. 0.20, previously present in the archive as
+	#    a standalone package): under certain circumstances, some
+	#    return a relative filename, whereas others return an absolute one;
+	#    we here use this module in a way that is at least compatible
+	#    with 0.18 and 0.20. Beware, hit'n'run refactorers!
+	my $infile = new File::Temp(TEMPLATE => "ikiwiki-po-filter-in.XXXXXXXXXX",
+				    DIR => File::Spec->tmpdir,
+				    UNLINK => 1)->filename;
+	my $outfile = new File::Temp(TEMPLATE => "ikiwiki-po-filter-out.XXXXXXXXXX",
+				     DIR => File::Spec->tmpdir,
+				     UNLINK => 1)->filename;
+
+	writefile(basename($infile), File::Spec->tmpdir, $content);
+
+	my ($masterpage, $lang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+	my $masterfile = srcfile($pagesources{$masterpage});
+	my (@pos,@masters);
+	push @pos,$infile;
+	push @masters,$masterfile;
+	my %options = (
+		"markdown" => (pagetype($masterfile) eq 'mdwn') ? 1 : 0,
+	);
+	my $doc=Locale::Po4a::Chooser::new('text',%options);
+	$doc->process(
+		'po_in_name'	=> \@pos,
+		'file_in_name'	=> \@masters,
+		'file_in_charset'  => 'utf-8',
+		'file_out_charset' => 'utf-8',
+	) or error("[po/filter:$page]: failed to translate");
+	$doc->write($outfile) or error("[po/filter:$page] could not write $outfile");
+	$content = readfile($outfile) or error("[po/filter:$page] could not read $outfile");
+
+	# Unlinking should happen automatically, thanks to File::Temp,
+	# but it does not work here, probably because of the way writefile()
+	# and Locale::Po4a::write() work.
+	unlink $infile, $outfile;
+
+	setalreadyfiltered($page, $destpage);
+	return $content;
+} #}}}
+
+sub htmlize (@) { #{{{
+	my %params=@_;
+
+	my $page = $params{page};
+	my $content = $params{content};
+	my ($masterpage, $lang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+	my $masterfile = srcfile($pagesources{$masterpage});
+
+	# force content to be htmlize'd as if it was the same type as the master page
+	return IkiWiki::htmlize($page, $page, pagetype($masterfile), $content);
+} #}}}
+
+sub percenttranslated ($) { #{{{
+	my $page=shift;
+
+	return gettext("N/A") unless (istranslation($page));
+	my ($masterpage, $lang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+	my $file=srcfile($pagesources{$page});
+	my $masterfile = srcfile($pagesources{$masterpage});
+	my (@pos,@masters);
+	push @pos,$file;
+	push @masters,$masterfile;
+	my %options = (
+		"markdown" => (pagetype($masterfile) eq 'mdwn') ? 1 : 0,
+	);
+	my $doc=Locale::Po4a::Chooser::new('text',%options);
+	$doc->process(
+		'po_in_name'	=> \@pos,
+		'file_in_name'	=> \@masters,
+		'file_in_charset'  => 'utf-8',
+		'file_out_charset' => 'utf-8',
+	) or error("[po/percenttranslated:$page]: failed to translate");
+	my ($percent,$hit,$queries) = $doc->stats();
+	return $percent;
+} #}}}
+
+sub otherlanguagesloop ($) { #{{{
+	my $page=shift;
+
+	my @ret;
+	if (istranslatable($page)) {
+		foreach my $lang (sort keys %{$translations{$page}}) {
+			my $translation = $translations{$page}{$lang};
+			push @ret, {
+				url => urlto($translation, $page),
+				code => $lang,
+				language => $config{po_slave_languages}{$lang},
+				percent => percenttranslated($translation),
+			};
+		}
+	}
+	elsif (istranslation($page)) {
+		my ($masterpage, $curlang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+		push @ret, {
+			url => urlto_with_orig_beautiful_urlpath($masterpage, $page),
+			code => $config{po_master_language}{code},
+			language => $config{po_master_language}{name},
+			master => 1,
+		};
+		foreach my $lang (sort keys %{$translations{$masterpage}}) {
+			push @ret, {
+				url => urlto($translations{$masterpage}{$lang}, $page),
+				code => $lang,
+				language => $config{po_slave_languages}{$lang},
+				percent => percenttranslated($translations{$masterpage}{$lang}),
+			} unless ($lang eq $curlang);
+		}
+	}
+	return @ret;
+} #}}}
+
+sub pagetemplate (@) { #{{{
+	my %params=@_;
+	my $page=$params{page};
+	my $destpage=$params{destpage};
+	my $template=$params{template};
+
+	my ($masterpage, $lang) = ($page =~ /(.*)[.]([a-z]{2})$/) if istranslation($page);
+
+	if (istranslation($page) && $template->query(name => "percenttranslated")) {
+		$template->param(percenttranslated => percenttranslated($page));
+	}
+	if ($template->query(name => "istranslation")) {
+		$template->param(istranslation => istranslation($page));
+	}
+	if ($template->query(name => "istranslatable")) {
+		$template->param(istranslatable => istranslatable($page));
+	}
+	if ($template->query(name => "otherlanguages")) {
+		$template->param(otherlanguages => [otherlanguagesloop($page)]);
+		map add_depends($page, $_), (values %{otherlanguages($page)});
+	}
+	# Rely on IkiWiki::Render's genpage() to decide wether
+	# a discussion link should appear on $page; this is not
+	# totally accurate, though: some broken links may be generated
+	# when cgiurl is disabled.
+	# This compromise avoids some code duplication, and will probably
+	# prevent future breakage when ikiwiki internals change.
+	# Known limitations are preferred to future random bugs.
+	if ($template->param('discussionlink') && istranslation($page)) {
+		$template->param('discussionlink' => htmllink(
+							$page,
+							$destpage,
+							$masterpage . '/' . gettext("Discussion"),
+							noimageinline => 1,
+							forcesubpage => 0,
+							linktext => gettext("Discussion"),
+							));
+	}
+	# Remove broken parentlink to ./index.html on home page's translations.
+	# It works because this hook has the "last" parameter set, to ensure it
+	# runs after parentlinks' own pagetemplate hook.
+	if ($template->param('parentlinks')
+	    && istranslation($page)
+	    && $masterpage eq "index") {
+		$template->param('parentlinks' => []);
+	}
+} # }}}
+
+sub change(@) { #{{{
+	my @rendered=@_;
+
+	my $updated_po_files=0;
+
+	# Refresh/create POT and PO files as needed.
+	foreach my $page (map pagename($_), @rendered) {
+		next unless istranslatable($page);
+		my $file=srcfile($pagesources{$page});
+		my $updated_pot_file=0;
+		# Only refresh Pot file if it does not exist, or if
+		# $pagesources{$page} was changed: don't if only the HTML was
+		# refreshed, e.g. because of a dependency.
+		if ((grep { $_ eq $pagesources{$page} } @origneedsbuild)
+		    || ! -e potfile($file)) {
+			refreshpot($file);
+			$updated_pot_file=1;
+		}
+		my @pofiles;
+		map {
+			push @pofiles, $_ if ($updated_pot_file || ! -e $_);
+		} (pofiles($file));
+		if (@pofiles) {
+			refreshpofiles($file, @pofiles);
+			map { IkiWiki::rcs_add($_); } @pofiles if ($config{rcs});
+			$updated_po_files=1;
+		}
+	}
+
+	if ($updated_po_files) {
+		# Check staged changes in.
+		if ($config{rcs}) {
+			IkiWiki::disable_commit_hook();
+			IkiWiki::rcs_commit_staged(gettext("updated PO files"),
+				"IkiWiki::Plugin::po::change", "127.0.0.1");
+			IkiWiki::enable_commit_hook();
+			IkiWiki::rcs_update();
+		}
+		# Reinitialize module's private variables.
+		resetalreadyfiltered();
+		resettranslationscache();
+		# Trigger a wiki refresh.
+		require IkiWiki::Render;
+		IkiWiki::refresh();
+		IkiWiki::saveindex();
+	}
+} #}}}
+
+sub editcontent () { #{{{
+	my %params=@_;
+	# as we're previewing or saving a page, the content may have
+	# changed, so tell the next filter() invocation it must not be lazy
+	unsetalreadyfiltered($params{page}, $params{page});
+	return $params{content};
+} #}}}
+
+sub istranslatable ($) { #{{{
+	my $page=shift;
+
+	my $file=$pagesources{$page};
+
+	if (! defined $file
+	    || (defined pagetype($file) && pagetype($file) eq 'po')
+	    || $file =~ /\.pot$/) {
+		return 0;
+	}
+	return pagespec_match($page, $config{po_translatable_pages});
+} #}}}
+
+sub _istranslation ($) { #{{{
+	my $page=shift;
+
+	my $file=$pagesources{$page};
+	if (! defined $file) {
+		return IkiWiki::FailReason->new("no file specified");
+	}
+
+	if (! defined $file
+	    || ! defined pagetype($file)
+ 	    || ! pagetype($file) eq 'po'
+	    || $file =~ /\.pot$/) {
+		return 0;
+	}
+
+	my ($masterpage, $lang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+	if (! defined $masterpage || ! defined $lang
+	    || ! (length($masterpage) > 0) || ! (length($lang) > 0)
+	    || ! defined $pagesources{$masterpage}
+	    || ! defined $config{po_slave_languages}{$lang}) {
+		return 0;
+	}
+
+	return istranslatable($masterpage);
+} #}}}
+
+sub istranslation ($) { #{{{
+	my $page=shift;
+
+	if (_istranslation($page)) {
+		my ($masterpage, $lang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+		$translations{$masterpage}{$lang}=$page unless exists $translations{$masterpage}{$lang};
+		return 1;
+	}
+	return 0;
+} #}}}
+
+package IkiWiki::PageSpec;
+use warnings;
+use strict;
+use IkiWiki 2.00;
+
+sub match_istranslation ($;@) { #{{{
+	my $page=shift;
+
+	if (IkiWiki::Plugin::po::istranslation($page)) {
+		return IkiWiki::SuccessReason->new("is a translation page");
+	}
+	else {
+		return IkiWiki::FailReason->new("is not a translation page");
+	}
+} #}}}
+
+sub match_istranslatable ($;@) { #{{{
+	my $page=shift;
+
+	if (IkiWiki::Plugin::po::istranslatable($page)) {
+		return IkiWiki::SuccessReason->new("is set as translatable in po_translatable_pages");
+	}
+	else {
+		return IkiWiki::FailReason->new("is not set as translatable in po_translatable_pages");
+	}
+} #}}}
+
+sub match_lang ($$;@) { #{{{
+	my $page=shift;
+	my $wanted=shift;
+
+	my $regexp=IkiWiki::glob2re($wanted);
+	my $lang;
+	my $masterpage;
+
+	if (IkiWiki::Plugin::po::istranslation($page)) {
+		($masterpage, $lang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+	}
+	else {
+		$lang = $config{po_master_language}{code};
+	}
+
+	if ($lang!~/^$regexp$/i) {
+		return IkiWiki::FailReason->new("file language is $lang, not $wanted");
+	}
+	else {
+		return IkiWiki::SuccessReason->new("file language is $wanted");
+	}
+} #}}}
+
+sub match_currentlang ($$;@) { #{{{
+	my $page=shift;
+
+	shift;
+	my %params=@_;
+	my ($currentmasterpage, $currentlang, $masterpage, $lang);
+
+	return IkiWiki::FailReason->new("no location provided") unless exists $params{location};
+
+	if (IkiWiki::Plugin::po::istranslation($params{location})) {
+		($currentmasterpage, $currentlang) = ($params{location} =~ /(.*)[.]([a-z]{2})$/);
+	}
+	else {
+		$currentlang = $config{po_master_language}{code};
+	}
+
+	if (IkiWiki::Plugin::po::istranslation($page)) {
+		($masterpage, $lang) = ($page =~ /(.*)[.]([a-z]{2})$/);
+	}
+	else {
+		$lang = $config{po_master_language}{code};
+	}
+
+	if ($lang eq $currentlang) {
+		return IkiWiki::SuccessReason->new("file language is the same as current one, i.e. $currentlang");
+	}
+	else {
+		return IkiWiki::FailReason->new("file language is $lang, whereas current language is $currentlang");
+	}
+} #}}}
+
+1
diff --git a/debian/control b/debian/control
index fdf2a3a36..04283532b 100644
--- a/debian/control
+++ b/debian/control
@@ -14,7 +14,7 @@ Package: ikiwiki
 Architecture: all
 Depends: ${perl:Depends}, markdown | libtext-markdown-perl, libhtml-scrubber-perl, libhtml-template-perl, libhtml-parser-perl, liburi-perl
 Recommends: gcc | c-compiler, libc6-dev | libc-dev, subversion | git-core (>= 1:1.5.0) | tla | bzr (>= 0.91) | mercurial | monotone (>= 0.38), libxml-simple-perl, libnet-openid-consumer-perl, liblwpx-paranoidagent-perl, libtimedate-perl, libcgi-formbuilder-perl (>= 3.05), libcgi-session-perl (>= 4.14-1), libmail-sendmail-perl, libauthen-passphrase-perl
-Suggests: viewvc | gitweb | viewcvs, libsearch-xapian-perl, xapian-omega (>= 1.0.5), librpc-xml-perl, libtext-wikiformat-perl, python, python-docutils, polygen, tidy, libxml-feed-perl, libmailtools-perl, perlmagick, libfile-mimeinfo-perl, libcrypt-ssleay-perl, liblocale-gettext-perl (>= 1.05-1), libtext-typography-perl, libtext-csv-perl, libdigest-sha1-perl, graphviz, libnet-amazon-s3-perl, sparkline-php, texlive, dvipng
+Suggests: viewvc | gitweb | viewcvs, libsearch-xapian-perl, xapian-omega (>= 1.0.5), librpc-xml-perl, libtext-wikiformat-perl, python, python-docutils, polygen, tidy, libxml-feed-perl, libmailtools-perl, perlmagick, libfile-mimeinfo-perl, libcrypt-ssleay-perl, liblocale-gettext-perl (>= 1.05-1), libtext-typography-perl, libtext-csv-perl, libdigest-sha1-perl, graphviz, libnet-amazon-s3-perl, sparkline-php, texlive, dvipng, po4a
 Conflicts: ikiwiki-plugin-table
 Replaces: ikiwiki-plugin-table
 Provides: ikiwiki-plugin-table
diff --git a/debian/copyright b/debian/copyright
index f257234dd..fe5db8af8 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -108,6 +108,10 @@ Files: google.pm
 Copyright: Copyright (C) 2008 Peter Simons <simons@cryp.to>
 License: GPL-2+
 
+Files: po.pm
+Copyright: (C) 2008 intrigeri <intrigeri@boum.org>
+License: GPL-2+
+
 Files: doc/logo/*
 Copyright: © 2006 Recai Oktaş <roktas@debian.org>
 License: GPL-2+
diff --git a/doc/ikiwiki/pagespec.mdwn b/doc/ikiwiki/pagespec.mdwn
index c78666c40..176228e4b 100644
--- a/doc/ikiwiki/pagespec.mdwn
+++ b/doc/ikiwiki/pagespec.mdwn
@@ -47,6 +47,8 @@ Some more elaborate limits can be added to what matches using these functions:
   wiki admins.
 * "`ip(address)`" - tests whether a modification is being made from the
   specified IP address.
+* Some additional special-purpose limits may be enabled, for matching
+  [[attachments|attachment]] and [[translations|po]].
 
 For example, to match all pages in a blog that link to the page about music
 and were written in 2005:
diff --git a/doc/ikiwiki/pagespec/po.mdwn b/doc/ikiwiki/pagespec/po.mdwn
new file mode 100644
index 000000000..a5f88cf66
--- /dev/null
+++ b/doc/ikiwiki/pagespec/po.mdwn
@@ -0,0 +1,16 @@
+[[!if test="enabled(po)"
+     then="This wiki has po support **enabled**."
+     else="This wiki has po support **disabled**."]]
+
+If the [po](plugins/po) plugin is enabled, the regular
+[[ikiwiki/PageSpec]] syntax is expanded with the following additional
+tests that can be used to improve user navigation in a multi-lingual
+wiki:
+
+* "`lang(LL)`" - Tests whether a page is written in the language
+  specified as a ISO639-1 (two-letter) language code.
+* "`currentlang()`" - Tests whether a page is written in the same
+  language as the current page.
+
+Note: every non-po page is considered to be written in
+`po_master_language`, as specified in `ikiwiki.setup`.
diff --git a/doc/plugins/po.mdwn b/doc/plugins/po.mdwn
new file mode 100644
index 000000000..e88cc3106
--- /dev/null
+++ b/doc/plugins/po.mdwn
@@ -0,0 +1,390 @@
+[[!template id=plugin name=po core=0 author="[[intrigeri]]"]]
+[[!tag type/format]]
+
+This plugin adds support for multi-lingual wikis, translated with
+gettext, using [po4a](http://po4a.alioth.debian.org/).
+
+It depends on the Perl `Locale::Po4a::Po` library (`apt-get install po4a`).
+
+[[!toc levels=2]]
+
+Introduction
+============
+
+A language is chosen as the "master" one, and any other supported
+language is a "slave" one.
+
+A page written in the "master" language is a "master" page. It can be
+of any page type supported by ikiwiki, except `po`. It does not have to be
+named a special way: migration to this plugin does not imply any page
+renaming work.
+
+Example: `bla/page.mdwn` is a "master" Markdown page written in
+English; if `usedirs` is enabled, it is rendered as
+`bla/page/index.en.html`, else as `bla/page.en.html`.
+
+Any translation of a "master" page into a "slave" language is called
+a "slave" page; it is written in the gettext PO format. `po` is now
+a page type supported by ikiwiki.
+
+Example: `bla/page.fr.po` is the PO "message catalog" used to
+translate `bla/page.mdwn` into French; if `usedirs` is enabled, it is
+rendered as `bla/page/index.fr.html`, else as `bla/page.fr.html`
+
+
+Configuration
+=============
+
+Supported languages
+-------------------
+
+`po_master_language` is used to set the "master" language in
+`ikiwiki.setup`, such as:
+
+        po_master_language => { 'code' => 'en', 'name' => 'English' }
+
+`po_slave_languages` is used to set the list of supported "slave"
+languages, such as:
+
+        po_slave_languages => { 'fr' => 'Français',
+                                'es' => 'Castellano',
+                                'de' => 'Deutsch',
+        }
+
+Decide which pages are translatable
+-----------------------------------
+
+The `po_translatable_pages` setting configures what pages are
+translatable. It is a [[ikiwiki/PageSpec]], so you have lots of
+control over what kind of pages are translatable.
+
+The `.po` files are not considered as being translatable, so you don't need to
+worry about excluding them explicitly from this [[ikiwiki/PageSpec]].
+
+Internal links
+--------------
+
+The `po_link_to` option in `ikiwiki.setup` is used to decide how
+internal links should be generated, depending on web server features
+and site-specific preferences.
+
+### Default linking behavior
+
+If `po_link_to` is unset, or set to `default`, ikiwiki's default
+linking behavior is preserved: `\[[destpage]]` links to the master
+language's page.
+
+### Link to current language
+
+If `po_link_to` is set to `current`, `\[[destpage]]` links to the
+`destpage`'s version written in the current page's language, if
+available, *i.e.*:
+
+- `foo/destpage/index.LL.html` if `usedirs` is enabled
+- `foo/destpage.LL.html` if `usedirs` is disabled
+
+### Link to negotiated language
+
+If `po_link_to` is set to `negotiated`, `\[[page]]` links to the
+negotiated preferred language, *i.e.* `foo/page/`.
+
+(In)compatibility notes:
+
+- if `usedirs` is disabled, it does not make sense to set `po_link_to`
+  to `negotiated`; this option combination is neither implemented
+  nor allowed.
+- if the web server does not support Content Negotiation, setting
+  `po_link_to` to `negotiated` will produce a unusable website.
+
+
+Server support
+==============
+
+Apache
+------
+
+Using Apache `mod_negotiation` makes it really easy to have Apache
+serve any page in the client's preferred language, if available.
+This is the default Debian Apache configuration.
+
+When `usedirs` is enabled, one has to set `DirectoryIndex index` for
+the wiki context.
+
+Setting `DefaultLanguage LL` (replace `LL` with your default MIME
+language code) for the wiki context can help to ensure
+`bla/page/index.en.html` is served as `Content-Language: LL`.
+
+lighttpd
+--------
+
+lighttpd unfortunately does not support content negotiation.
+
+**FIXME**: does `mod_magnet` provide the functionality needed to
+ emulate this?
+
+
+Usage
+=====
+
+Templates
+---------
+
+The `ISTRANSLATION` and `ISTRANSLATABLE` variables can be used to
+display things only on translatable or translation pages.
+
+### Display page's versions in other languages
+
+The `OTHERLANGUAGES` loop provides ways to display other languages'
+versions of the same page, and the translations' status.
+
+One typically adds the following code to `templates/page.tmpl`:
+
+	<TMPL_IF NAME="OTHERLANGUAGES">
+	<div id="otherlanguages">
+	  <ul>
+	  <TMPL_LOOP NAME="OTHERLANGUAGES">
+	    <li>
+	      <a href="<TMPL_VAR NAME="URL">"><TMPL_VAR NAME="LANGUAGE"></a>
+	      <TMPL_UNLESS NAME="MASTER">
+	        (<TMPL_VAR NAME="PERCENT">&nbsp;%)
+	      </TMPL_UNLESS>
+	    </li>
+	  </TMPL_LOOP>
+	  </ul>
+	</div>
+	</TMPL_IF>
+
+The following variables are available inside the loop (for every page in):
+
+- `URL` - url to the page
+- `CODE` - two-letters language code
+- `LANGUAGE` - language name (as defined in `po_slave_languages`)
+- `MASTER` - is true (1) if, and only if the page is a "master" page
+- `PERCENT` - for "slave" pages, is set to the translation completeness, in percents
+
+### Display the current translation status
+
+The `PERCENTTRANSLATED` variable is set to the translation
+completeness, expressed in percent, on "slave" pages.
+
+One can use it this way:
+
+	<TMPL_IF NAME="ISTRANSLATION">
+	<div id="percenttranslated">
+	  <TMPL_VAR NAME="PERCENTTRANSLATED">
+	</div>
+	</TMPL_IF>
+
+Additional PageSpec tests
+-------------------------
+
+This plugin enhances the regular [[ikiwiki/PageSpec]] syntax with some
+additional tests that are documented [[here|ikiwiki/pagespec/po]].
+
+Automatic PO file update
+------------------------
+
+Committing changes to a "master" page:
+
+1. updates the POT file and the PO files for the "slave" languages;
+   the updated PO files are then put under version control;
+2. triggers a refresh of the corresponding HTML slave pages.
+
+Also, when the plugin has just been enabled, or when a page has just
+been declared as being translatable, the needed POT and PO files are
+created, and the PO files are checked into version control.
+
+Discussion pages
+----------------
+
+Discussion should happen in the language in which the pages are
+written for real, *i.e.* the "master" one. If discussion pages are
+enabled, "slave" pages therefore link to the "master" page's
+discussion page.
+
+Translating
+-----------
+
+One can edit the PO files using ikiwiki's CGI (a message-by-message
+interface could also be implemented at some point).
+
+If [[tips/untrusted_git_push]] is setup, one can edit the PO files in one's
+preferred `$EDITOR`, without needing to be online.
+
+TODO
+====
+
+Security checks
+---------------
+
+### Security history
+
+The only past security issues I could find in GNU gettext and po4a
+are:
+
+- [CVE-2004-0966](http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0966),
+  *i.e.* [Debian bug #278283](http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=278283):
+  the autopoint and gettextize scripts in the GNU gettext package
+  1.14 and later versions, as used in Trustix Secure Linux 1.5
+  through 2.1 and other operating systems, allows local users to
+  overwrite files via a symlink attack on temporary files.
+- [CVE-2007-4462](http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4462):
+  `lib/Locale/Po4a/Po.pm` in po4a before 0.32 allows local users to
+  overwrite arbitrary files via a symlink attack on the
+  gettextization.failed.po temporary file.
+
+**FIXME**: check whether this plugin would have been a possible attack
+vector to exploit these vulnerabilities.
+
+Depending on my mood, the lack of found security issues can either
+indicate that there are none, or reveal that no-one ever bothered to
+find (and publish) them.
+
+### PO file features
+
+Can any sort of directives be put in po files that will cause mischief
+(ie, include other files, run commands, crash gettext, whatever)?
+
+> No [documented](http://www.gnu.org/software/gettext/manual/gettext.html#PO-Files)
+> directive is supposed to do so. [[--intrigeri]]
+
+### Running po4a on untrusted content
+
+Are there any security issues on running po4a on untrusted content?
+
+To say the least, this issue is not well covered, at least publicly:
+
+- the documentation does not talk about it;
+- grep'ing the source code for `security` or `trust` gives no answer.
+
+On the other hand, a po4a developer answered my questions in
+a convincing manner, stating that processing untrusted content was not
+an initial goal, and analysing in detail the possible issues.
+
+#### Already checked
+
+- the core (`Po.pm`, `Transtractor.pm`) should be safe
+- po4a source code was fully checked for other potential symlink
+  attacks, after discovery of one such issue
+- the only external program run by the core is `diff`, in `Po.pm` (in
+  parts of its code we don't use)
+- `Locale::gettext`: only used to display translated error messages
+- Nicolas François "hopes" `DynaLoader` is safe, and has "no reason to
+  think that `Encode` is not safe"
+- Nicolas François has "no reason to think that `Encode::Guess` is not
+  safe". The po plugin nevertheless avoids using it by defining the
+  input charset (`file_in_charset`) before asking `Transtractor` to
+  read any file. NB: this hack depends on po4a internals to stay
+  the same.
+
+#### To be checked
+
+##### Locale::Po4a modules
+
+- the modules we want to use have to be checked, as not all are safe
+  (e.g. the LaTeX module's behaviour is changed by commands included
+  in the content); they may use regexps generated from the content; we
+  currently only use the `Text` module
+- the `Text` module does not run any external program
+- check that no module is loaded by `Chooser.pm`, when we tell it to
+  load the `Text` one
+- `nsgmls` is used by `Sgml.pm`
+
+##### Text::WrapI18N
+
+`Text::WrapI18N` can cause DoS (see the
+[Debian bug #470250](http://bugs.debian.org/470250)), but it is
+optional and we do not need the features it provides.
+
+It is loaded if available by `Locale::Po4a::Common`; looking at the
+code, I'm not sure we can prevent this at all, but maybe some symbol
+table manipulation tricks could work; overriding
+`Locale::Po4a::Common::wrapi18n` may be easier. I'm no expert at all
+in this field. Joey? [[--intrigeri]]
+
+##### Term::ReadKey
+
+`Term::ReadKey` is not a hard dependency in our case, *i.e.* po4a
+works nicely without it. But the po4a Debian package recommends
+`libterm-readkey-perl`, so it will probably be installed on most
+systems using the po plugin.
+
+If `$ENV{COLUMNS}` is not set, `Locale::Po4a::Common` uses
+`Term::ReadKey::GetTerminalSize()` to get the terminal size. How safe
+is this?
+
+Part of `Term::ReadKey` is written in C. Depending on the runtime
+platform, this function use ioctl, environment, or C library function
+calls, and may end up running the `resize` command (without
+arguments).
+
+IMHO, using Term::ReadKey has too far reaching implications for us to
+be able to guarantee anything wrt. security. Since it is anyway of no
+use in our case, I suggest we define `ENV{COLUMNS}` before loading
+`Locale::Po4a::Common`, just to be on the safe side. Joey?
+[[--intrigeri]]
+
+### msgmerge
+
+`refreshpofiles()` runs this external program. A po4a developer
+answered he does "not expect any security issues from it".
+
+### Fuzzing input
+
+I was not able to find any public information about gettext or po4a
+having been tested with a fuzzing program, such as `zzuf` or `fusil`.
+Moreover, some gettext parsers seem to be quite
+[easy to crash](http://fusil.hachoir.org/trac/browser/trunk/fuzzers/fusil-gettext),
+so it might be useful to bang msgmerge/po4a's heads against such
+a program in order to easily detect some of the most obvious DoS.
+[[--intrigeri]]
+
+> po4a was not fuzzy-tested, but according to one of its developers,
+> "it would be really appreciated". [[--intrigeri]]
+
+gettext/po4a rough corners
+--------------------------
+
+- fix infinite loop when synchronizing two ikiwiki (when checkouts
+  live in different directories): say bla.fr.po has been updated in
+  repo2; pulling repo2 from repo1 seems to trigger a PO update, that
+  changes bla.fr.po in repo1; then pushing repo1 to repo2 triggers
+  a PO update, that changes bla.fr.po in repo2; etc.; quickly fixed in
+  `629968fc89bced6727981c0a1138072631751fee`, by disabling references
+  in Pot files. Using `Locale::Po4a::write_if_needed` might be
+  a cleaner solution. (warning: this function runs the external
+  `diff` program, have to check security)
+- new translations created in the web interface must get proper
+  charset/encoding gettext metadata, else the next automatic PO update
+  removes any non-ascii chars; possible solution: put such metadata
+  into the Pot file, and let it propagate; should be fixed in
+  `773de05a7a1ee68d2bed173367cf5e716884945a`, time will tell.
+
+Misc. improvements
+------------------
+
+### page titles
+
+Use nice page titles from meta plugin in links, as inline already
+does. This is actually a duplicate for
+[[bugs/pagetitle_function_does_not_respect_meta_titles]], which might
+be fixed by something like [[todo/using_meta_titles_for_parentlinks]].
+
+### source files format
+
+Markdown is supported, great, but what about others? The set of file
+formats supported both in ikiwiki and po4a probably is greater than
+`{markdown}`. Warning: the po4a modules are the place where one can
+expect security issues.
+
+Translation quality assurance
+-----------------------------
+
+Modifying a PO file via the CGI must be forbidden if the new version
+is not a valid PO file. As a bonus, check that it provides a more
+complete translation than the existing one.
+
+A new `cansave` type of hook would be needed to implement this.
+
+Note: committing to the underlying repository is a way to bypass
+this check.
diff --git a/t/po.t b/t/po.t
new file mode 100755
index 000000000..3074372d3
--- /dev/null
+++ b/t/po.t
@@ -0,0 +1,167 @@
+#!/usr/bin/perl
+# -*- cperl-indent-level: 8; -*-
+use warnings;
+use strict;
+use File::Temp qw{tempdir};
+
+BEGIN {
+	unless (eval { require Locale::Po4a::Chooser }) {
+		eval q{
+			use Test::More skip_all => "Locale::Po4a::Chooser::new is not available"
+		}
+	}
+	unless (eval { require Locale::Po4a::Po }) {
+		eval q{
+			use Test::More skip_all => "Locale::Po4a::Po::new is not available"
+		}
+	}
+}
+
+use Test::More tests => 52;
+
+BEGIN { use_ok("IkiWiki"); }
+
+my $msgprefix;
+
+my $dir = tempdir("ikiwiki-test-po.XXXXXXXXXX",
+		  DIR => File::Spec->tmpdir,
+		  CLEANUP => 1);
+
+### Init
+%config=IkiWiki::defaultconfig();
+$config{srcdir} = "$dir/src";
+$config{destdir} = "$dir/dst";
+$config{discussion} = 0;
+$config{po_master_language} = { code => 'en',
+				name => 'English'
+			      };
+$config{po_slave_languages} = {
+			       es => 'Castellano',
+			       fr => "Français"
+			      };
+$config{po_translatable_pages}='index or test1 or test2 or translatable';
+$config{po_link_to}='negotiated';
+IkiWiki::loadplugins();
+IkiWiki::checkconfig();
+ok(IkiWiki::loadplugin('po'), "po plugin loaded");
+
+### seed %pagesources and %pagecase
+$pagesources{'index'}='index.mdwn';
+$pagesources{'index.fr'}='index.fr.po';
+$pagesources{'index.es'}='index.es.po';
+$pagesources{'test1'}='test1.mdwn';
+$pagesources{'test1.fr'}='test1.fr.po';
+$pagesources{'test2'}='test2.mdwn';
+$pagesources{'test2.es'}='test2.es.po';
+$pagesources{'test2.fr'}='test2.fr.po';
+$pagesources{'test3'}='test3.mdwn';
+$pagesources{'test3.es'}='test3.es.mdwn';
+$pagesources{'translatable'}='translatable.mdwn';
+$pagesources{'translatable.fr'}='translatable.fr.po';
+$pagesources{'translatable.es'}='translatable.es.po';
+$pagesources{'nontranslatable'}='nontranslatable.mdwn';
+foreach my $page (keys %pagesources) {
+    $IkiWiki::pagecase{lc $page}=$page;
+}
+
+### istranslatable/istranslation
+# we run these tests twice because memoization attempts made them
+# succeed once every two tries...
+ok(IkiWiki::Plugin::po::istranslatable('index'), "index is translatable");
+ok(IkiWiki::Plugin::po::istranslatable('index'), "index is translatable");
+ok(! IkiWiki::Plugin::po::istranslatable('index.fr'), "index.fr is not translatable");
+ok(! IkiWiki::Plugin::po::istranslatable('index.fr'), "index.fr is not translatable");
+ok(! IkiWiki::Plugin::po::istranslatable('index.es'), "index.es is not translatable");
+ok(! IkiWiki::Plugin::po::istranslatable('index.es'), "index.es is not translatable");
+ok(! IkiWiki::Plugin::po::istranslation('index'), "index is not a translation");
+ok(! IkiWiki::Plugin::po::istranslation('index'), "index is not a translation");
+ok(IkiWiki::Plugin::po::istranslation('index.fr'), "index.fr is a translation");
+ok(IkiWiki::Plugin::po::istranslation('index.fr'), "index.fr is a translation");
+ok(IkiWiki::Plugin::po::istranslation('index.es'), "index.es is a translation");
+ok(IkiWiki::Plugin::po::istranslation('index.es'), "index.es is a translation");
+ok(IkiWiki::Plugin::po::istranslatable('test2'), "test2 is translatable");
+ok(IkiWiki::Plugin::po::istranslatable('test2'), "test2 is translatable");
+ok(! IkiWiki::Plugin::po::istranslation('test2'), "test2 is not a translation");
+ok(! IkiWiki::Plugin::po::istranslation('test2'), "test2 is not a translation");
+ok(! IkiWiki::Plugin::po::istranslatable('test3'), "test3 is not translatable");
+ok(! IkiWiki::Plugin::po::istranslatable('test3'), "test3 is not translatable");
+ok(! IkiWiki::Plugin::po::istranslation('test3'), "test3 is not a translation");
+ok(! IkiWiki::Plugin::po::istranslation('test3'), "test3 is not a translation");
+
+### links
+require IkiWiki::Render;
+
+sub refresh_n_scan(@) {
+	my @masterfiles_rel=@_;
+	foreach my $masterfile_rel (@masterfiles_rel) {
+		my $masterfile=srcfile($masterfile_rel);
+		IkiWiki::scan($masterfile_rel);
+		next unless IkiWiki::Plugin::po::istranslatable(pagename($masterfile_rel));
+		my @pofiles=IkiWiki::Plugin::po::pofiles($masterfile);
+		IkiWiki::Plugin::po::refreshpot($masterfile);
+		IkiWiki::Plugin::po::refreshpofiles($masterfile, @pofiles);
+		map IkiWiki::scan(IkiWiki::abs2rel($_, $config{srcdir})), @pofiles;
+	}
+}
+
+writefile('index.mdwn', $config{srcdir}, '[[translatable]] [[nontranslatable]]');
+writefile('translatable.mdwn', $config{srcdir}, '[[nontranslatable]]');
+writefile('nontranslatable.mdwn', $config{srcdir}, '[[/]] [[translatable]]');
+
+$config{po_link_to}='negotiated';
+$msgprefix="links (po_link_to=negotiated)";
+refresh_n_scan('index.mdwn', 'translatable.mdwn', 'nontranslatable.mdwn');
+is_deeply(\@{$links{'index'}}, ['translatable', 'nontranslatable'], "$msgprefix index");
+is_deeply(\@{$links{'index.es'}}, ['translatable.es', 'nontranslatable'], "$msgprefix index.es");
+is_deeply(\@{$links{'index.fr'}}, ['translatable.fr', 'nontranslatable'], "$msgprefix index.fr");
+is_deeply(\@{$links{'translatable'}}, ['nontranslatable'], "$msgprefix translatable");
+is_deeply(\@{$links{'translatable.es'}}, ['nontranslatable'], "$msgprefix translatable.es");
+is_deeply(\@{$links{'translatable.fr'}}, ['nontranslatable'], "$msgprefix translatable.fr");
+is_deeply(\@{$links{'nontranslatable'}}, ['/', 'translatable', 'translatable.fr', 'translatable.es'], "$msgprefix nontranslatable");
+
+$config{po_link_to}='current';
+$msgprefix="links (po_link_to=current)";
+refresh_n_scan('index.mdwn', 'translatable.mdwn', 'nontranslatable.mdwn');
+use Data::Dumper;
+print Dumper(%links);
+is_deeply(\@{$links{'index'}}, ['translatable', 'nontranslatable'], "$msgprefix index");
+is_deeply(\@{$links{'index.es'}}, [ map bestlink('index.es', $_), ('translatable.es', 'nontranslatable')], "$msgprefix index.es");
+is_deeply(\@{$links{'index.fr'}}, [ map bestlink('index.fr', $_), ('translatable.fr', 'nontranslatable')], "$msgprefix index.fr");
+is_deeply(\@{$links{'translatable'}}, [bestlink('translatable', 'nontranslatable')], "$msgprefix translatable");
+is_deeply(\@{$links{'translatable.es'}}, ['nontranslatable'], "$msgprefix translatable.es");
+is_deeply(\@{$links{'translatable.fr'}}, ['nontranslatable'], "$msgprefix translatable.fr");
+is_deeply(\@{$links{'nontranslatable'}}, ['/', 'translatable', 'translatable.fr', 'translatable.es'], "$msgprefix nontranslatable");
+
+### targetpage
+$config{usedirs}=0;
+$msgprefix="targetpage (usedirs=0)";
+is(targetpage('test1', 'html'), 'test1.en.html', "$msgprefix test1");
+is(targetpage('test1.fr', 'html'), 'test1.fr.html', "$msgprefix test1.fr");
+$config{usedirs}=1;
+$msgprefix="targetpage (usedirs=1)";
+is(targetpage('index', 'html'), 'index.en.html', "$msgprefix index");
+is(targetpage('index.fr', 'html'), 'index.fr.html', "$msgprefix index.fr");
+is(targetpage('test1', 'html'), 'test1/index.en.html', "$msgprefix test1");
+is(targetpage('test1.fr', 'html'), 'test1/index.fr.html', "$msgprefix test1.fr");
+is(targetpage('test3', 'html'), 'test3/index.html', "$msgprefix test3 (non-translatable page)");
+is(targetpage('test3.es', 'html'), 'test3.es/index.html', "$msgprefix test3.es (non-translatable page)");
+
+### bestlink
+$config{po_link_to}='current';
+$msgprefix="bestlink (po_link_to=current)";
+is(bestlink('test1.fr', 'test2'), 'test2.fr', "$msgprefix test1.fr -> test2");
+is(bestlink('test1.fr', 'test2.es'), 'test2.es', "$msgprefix test1.fr -> test2.es");
+$config{po_link_to}='negotiated';
+$msgprefix="bestlink (po_link_to=negotiated)";
+is(bestlink('test1.fr', 'test2'), 'test2', "$msgprefix test1.fr -> test2");
+is(bestlink('test1.fr', 'test2.es'), 'test2.es', "$msgprefix test1.fr -> test2.es");
+
+### beautify_urlpath
+$config{po_link_to}='default';
+$msgprefix="beautify_urlpath (po_link_to=default)";
+is(IkiWiki::beautify_urlpath('test1/index.en.html'), './test1/index.en.html', "$msgprefix test1/index.en.html");
+is(IkiWiki::beautify_urlpath('test1/index.fr.html'), './test1/index.fr.html', "$msgprefix test1/index.fr.html");
+$config{po_link_to}='negotiated';
+$msgprefix="beautify_urlpath (po_link_to=negotiated)";
+is(IkiWiki::beautify_urlpath('test1/index.en.html'), './test1/', "$msgprefix test1/index.en.html");
+is(IkiWiki::beautify_urlpath('test1/index.fr.html'), './test1/index.fr.html', "$msgprefix test1/index.fr.html");
diff --git a/t/syntax.t b/t/syntax.t
index d09d17f7f..8c96d1d84 100755
--- a/t/syntax.t
+++ b/t/syntax.t
@@ -6,7 +6,7 @@ use Test::More;
 my @progs="ikiwiki.in";
 my @libs="IkiWiki.pm";
 # monotone, external, amazon_s3 skipped since they need perl modules
-push @libs, map { chomp; $_ } `find IkiWiki -type f -name \\*.pm | grep -v monotone.pm | grep -v external.pm | grep -v amazon_s3.pm`;
+push @libs, map { chomp; $_ } `find IkiWiki -type f -name \\*.pm | grep -v monotone.pm | grep -v external.pm | grep -v amazon_s3.pm | grep -v po.pm`;
 push @libs, 'IkiWiki/Plugin/skeleton.pm.example';
 
 plan(tests => (@progs + @libs));
diff --git a/underlays/basewiki/ikiwiki/pagespec/po.mdwn b/underlays/basewiki/ikiwiki/pagespec/po.mdwn
new file mode 120000
index 000000000..255c3de9a
--- /dev/null
+++ b/underlays/basewiki/ikiwiki/pagespec/po.mdwn
@@ -0,0 +1 @@
+../../../../doc/ikiwiki/pagespec/po.mdwn
\ No newline at end of file