X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/b4ab0d0b9eae7b2204b8ea8e1ee70e63117b23ab..0d874f0b69c25cb4c5faed59261446dad0b22d32:/IkiWiki/Plugin/po.pm

diff --git a/IkiWiki/Plugin/po.pm b/IkiWiki/Plugin/po.pm
index 1754260ed..292775975 100644
--- a/IkiWiki/Plugin/po.pm
+++ b/IkiWiki/Plugin/po.pm
@@ -21,16 +21,11 @@ use UNIVERSAL;
 
 my %translations;
 my @origneedsbuild;
+my %origsubs;
 
+memoize("istranslatable");
 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);
@@ -40,6 +35,8 @@ sub import { #{{{
 	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 => "rename", id => "po", call => \&renamepages);
+	hook(type => "delete", id => "po", call => \&mydelete);
 	hook(type => "change", id => "po", call => \&change);
 	hook(type => "editcontent", id => "po", call => \&editcontent);
 
@@ -51,13 +48,31 @@ sub import { #{{{
 	inject(name => "IkiWiki::targetpage", call => \&mytargetpage);
 	$origsubs{'urlto'}=\&IkiWiki::urlto;
 	inject(name => "IkiWiki::urlto", call => \&myurlto);
+	$origsubs{'nicepagetitle'}=\&IkiWiki::nicepagetitle;
+	inject(name => "IkiWiki::nicepagetitle", call => \&mynicepagetitle);
 } #}}}
 
+
+# ,----
+# | Table of contents
+# `----
+
+# 1. Hooks
+# 2. Injected functions
+# 3. Blackboxes for private data
+# 4. Helper functions
+# 5. PageSpec's
+
+
+# ,----
+# | Hooks
+# `----
+
 sub getsetup () { #{{{
 	return
 		plugin => {
 			safe => 0,
-			rebuild => 1, # format plugin & changes html filenames
+			rebuild => 1,
 		},
 		po_master_language => {
 			type => "string",
@@ -97,11 +112,6 @@ sub getsetup () { #{{{
 		},
 } #}}}
 
-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}) {
@@ -137,97 +147,6 @@ sub checkconfig () { #{{{
 	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 $masterpage = masterpage($page);
-		$ret{$config{po_master_language}{code}} = $masterpage;
-		foreach my $lang (sort keys %{$translations{$masterpage}}) {
-			next if $lang eq lang($page);
-			$ret{$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;
 
@@ -235,6 +154,7 @@ sub needsbuild () { #{{{
 	# a given master page was rendered because its source file was changed
 	@origneedsbuild=(@$needsbuild);
 
+	flushmemoizecache();
 	buildtranslationscache();
 
 	# make existing translations depend on the corresponding master page
@@ -243,6 +163,10 @@ sub needsbuild () { #{{{
 	}
 } #}}}
 
+# Massage the recorded state of internal links so that:
+# - it matches the actually generated links, rather than the links as written
+#   in the pages' source
+# - backlinks are consistent in all cases
 sub scan (@) { #{{{
 	my %params=@_;
 	my $page=$params{page};
@@ -269,125 +193,15 @@ sub scan (@) { #{{{
 	elsif (! istranslatable($page) && ! istranslation($page)) {
 		foreach my $destpage (@{$links{$page}}) {
 			if (istranslatable($destpage)) {
-				map {
-					push @{$links{$page}}, $destpage . '.' . $_;
-				} (keys %{$config{po_slave_languages}});
+				# make sure any destpage's translations has
+				# $page in its backlinks
+				push @{$links{$page}},
+					values %{otherlanguages($destpage)};
 			}
 		}
 	}
 } #}}}
 
-sub mytargetpage ($$) { #{{{
-	my $page=shift;
-	my $ext=shift;
-
-	if (istranslation($page)) {
-		my ($masterpage, $lang) = (masterpage($page), lang($page));
-		if (! $config{usedirs} || $masterpage eq 'index') {
-			return $masterpage . "." . $lang . "." . $ext;
-		}
-		else {
-			return $masterpage . "/index." . $lang . "." . $ext;
-		}
-	}
-	elsif (istranslatable($page)) {
-		if (! $config{usedirs} || $page eq 'index') {
-			return $page . "." . $config{po_master_language}{code} . "." . $ext;
-		}
-		else {
-			return $page . "/index." . $config{po_master_language}{code} . "." . $ext;
-		}
-	}
-	return $origsubs{'targetpage'}->($page, $ext);
-} #}}}
-
-sub mybeautify_urlpath ($) { #{{{
-	my $url=shift;
-
-	my $res=$origsubs{'beautify_urlpath'}->($url);
-	if ($config{po_link_to} eq "negotiated") {
-		$res =~ s!/\Qindex.$config{po_master_language}{code}.$config{htmlext}\E$!/!;
-	}
-	return $res;
-} #}}}
-
-sub urlto_with_orig_beautiful_urlpath($$) { #{{{
-	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 ($$;$) { #{{{
-	my $to=shift;
-	my $from=shift;
-	my $absolute=shift;
-
-	# workaround hard-coded /index.$config{htmlext} in IkiWiki::urlto()
-	if (! length $to
-	    && $config{po_link_to} eq "current"
-	    && istranslation($from)
-	    && istranslatable('index')) {
-		return IkiWiki::beautify_urlpath(IkiWiki::baseurl($from) . "index." . lang($from) . ".$config{htmlext}");
-	}
-	return $origsubs{'urlto'}->($to,$from,$absolute);
-} #}}}
-
-sub mybestlink ($$) { #{{{
-	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)) {
-			return $res . "." . lang($page);
-		}
-		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 (@) { #{{{
@@ -454,73 +268,14 @@ sub htmlize (@) { #{{{
 
 	my $page = $params{page};
 	my $content = $params{content};
-	my $masterfile = srcfile($pagesources{masterpage($page)});
 
-	# 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 $file=srcfile($pagesources{$page});
-	my $masterfile = srcfile($pagesources{masterpage($page)});
-	my (@pos,@masters);
-	push @pos,$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 $percent;
-} #}}}
-
-sub languagename ($) { #{{{
-	my $code=shift;
-
-	return $config{po_master_language}{name}
-		if $code eq $config{po_master_language}{code};
-	return $config{po_slave_languages}{$code}
-		if defined $config{po_slave_languages}{$code};
-	return;
-} #}}}
-
-sub otherlanguagesloop ($) { #{{{
-	my $page=shift;
+	# ignore PO files this plugin did not create
+	return $content unless istranslation($page);
 
-	my @ret;
-	my %otherpages=%{otherlanguages($page)};
-	while (my ($lang, $otherpage) = each %otherpages) {
-		if (istranslation($page) && masterpage($page) eq $otherpage) {
-			push @ret, {
-				url => urlto_with_orig_beautiful_urlpath($otherpage, $page),
-				code => $lang,
-				language => languagename($lang),
-				master => 1,
-			};
-		}
-		else {
-			push @ret, {
-				url => urlto($otherpage, $page),
-				code => $lang,
-				language => languagename($lang),
-				percent => percenttranslated($otherpage),
-			}
-		}
-	}
-	return sort {
-			return -1 if $a->{code} eq $config{po_master_language}{code};
-			return 1 if $b->{code} eq $config{po_master_language}{code};
-			return $a->{language} cmp $b->{language};
-		} @ret;
+	# force content to be htmlize'd as if it was the same type as the master page
+	return IkiWiki::htmlize($page, $page,
+				pagetype(srcfile($pagesources{masterpage($page)})),
+				$content);
 } #}}}
 
 sub pagetemplate (@) { #{{{
@@ -540,6 +295,9 @@ sub pagetemplate (@) { #{{{
 	if ($template->query(name => "istranslatable")) {
 		$template->param(istranslatable => istranslatable($page));
 	}
+	if ($template->query(name => "HOMEPAGEURL")) {
+		$template->param(homepageurl => homepageurl($page));
+	}
 	if ($template->query(name => "otherlanguages")) {
 		$template->param(otherlanguages => [otherlanguagesloop($page)]);
 		map add_depends($page, $_), (values %{otherlanguages($page)});
@@ -571,107 +329,265 @@ sub pagetemplate (@) { #{{{
 	}
 } # }}}
 
+# Add the renamed page translations to the list of to-be-renamed pages.
+# Save information about master page rename, so that:
+# - our delete hook can ignore the translations not renamed already
+# - our change hook can rename the translations accordingly.
+sub renamepages() { #{{{
+	my $torename=shift;
+	my @torename=@{$torename};
+
+	foreach my $rename (@torename) {
+		next unless istranslatable($rename->{src});
+		my %otherpages=%{otherlanguages($rename->{src})};
+		while (my ($lang, $otherpage) = each %otherpages) {
+			push @{$torename}, {
+				src => $otherpage,
+				srcfile => $pagesources{$otherpage},
+				dest => otherlanguage($rename->{dest}, $lang),
+				destfile => $rename->{dest}.".".$lang.".po",
+				required => 0,
+			};
+		}
+	}
+} #}}}
+
+sub mydelete(@) { #{{{
+	my @deleted=@_;
+
+	map {
+		deletetranslations($_);
+	} grep { istranslatablefile($_) } @deleted;
+} #}}}
+
 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});
+	foreach my $file (@rendered) {
+		next unless istranslatablefile($file);
+		my $page=pagename($file);
+		my $masterfile=srcfile($file);
 		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);
+		    || ! -e potfile($masterfile)) {
+			refreshpot($masterfile);
 			$updated_pot_file=1;
 		}
 		my @pofiles;
 		map {
 			push @pofiles, $_ if ($updated_pot_file || ! -e $_);
-		} (pofiles($file));
+		} (pofiles($masterfile));
 		if (@pofiles) {
-			refreshpofiles($file, @pofiles);
+			refreshpofiles($masterfile, @pofiles);
 			map { IkiWiki::rcs_add($_); } @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();
+		commit_and_refresh(
+			gettext("updated PO files"),
+			"IkiWiki::Plugin::po::change");
 	}
 } #}}}
 
+# As we're previewing or saving a page, the content may have
+# changed, so tell the next filter() invocation it must not be lazy.
 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 ($) { #{{{
+
+# ,----
+# | Injected functions
+# `----
+
+# Implement po_link_to 'current' and 'negotiated' settings.
+sub mybestlink ($$) { #{{{
 	my $page=shift;
+	my $link=shift;
 
-	my $file=$pagesources{$page};
+	my $res=$origsubs{'bestlink'}->(masterpage($page), $link);
+	if (length $res
+	    && ($config{po_link_to} eq "current" || $config{po_link_to} eq "negotiated")
+	    && istranslatable($res)
+	    && istranslation($page)) {
+		return $res . "." . lang($page);
+	}
+	return $res;
+} #}}}
 
-	if (! defined $file
-	    || (defined pagetype($file) && pagetype($file) eq 'po')
-	    || $file =~ /\.pot$/) {
-		return 0;
+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}.$config{htmlext}\E$!/!;
+		$res =~ s!/\Qindex.$config{htmlext}\E$!/!;
+		map {
+			$res =~ s!/\Qindex.$_.$config{htmlext}\E$!/!;
+		} (keys %{$config{po_slave_languages}});
 	}
-	return pagespec_match($page, $config{po_translatable_pages});
+	return $res;
 } #}}}
 
-sub _istranslation ($) { #{{{
+sub mytargetpage ($$) { #{{{
 	my $page=shift;
+	my $ext=shift;
 
-	my $file=$pagesources{$page};
-	if (! defined $file) {
-		return IkiWiki::FailReason->new("no file specified");
+	if (istranslation($page) || istranslatable($page)) {
+		my ($masterpage, $lang) = (masterpage($page), lang($page));
+		if (! $config{usedirs} || $masterpage eq 'index') {
+			return $masterpage . "." . $lang . "." . $ext;
+		}
+		else {
+			return $masterpage . "/index." . $lang . "." . $ext;
+		}
 	}
+	return $origsubs{'targetpage'}->($page, $ext);
+} #}}}
+
+sub myurlto ($$;$) { #{{{
+	my $to=shift;
+	my $from=shift;
+	my $absolute=shift;
 
-	if (! defined $file
-	    || ! defined pagetype($file)
- 	    || ! pagetype($file) eq 'po'
-	    || $file =~ /\.pot$/) {
-		return 0;
+	# workaround hard-coded /index.$config{htmlext} in IkiWiki::urlto()
+	if (! length $to
+	    && $config{po_link_to} eq "current"
+	    && istranslatable('index')) {
+		return IkiWiki::beautify_urlpath(IkiWiki::baseurl($from) . "index." . lang($from) . ".$config{htmlext}");
+	}
+	# avoid using our injected beautify_urlpath if run by cgi_editpage,
+	# so that one is redirected to the just-edited page rather than to the
+	# negociated translation; to prevent unnecessary fiddling with caller/inject,
+	# we only do so when our beautify_urlpath would actually do what we want to
+	# avoid, i.e. when po_link_to = negotiated
+	if ($config{po_link_to} eq "negotiated") {
+		my @caller = caller(1);
+		my $run_by_editpage = ($caller[3] eq "IkiWiki::cgi_editpage");
+		inject(name => "IkiWiki::beautify_urlpath", call => $origsubs{'beautify_urlpath'})
+			if $run_by_editpage;
+		my $res = $origsubs{'urlto'}->($to,$from,$absolute);
+		inject(name => "IkiWiki::beautify_urlpath", call => \&mybeautify_urlpath)
+			if $run_by_editpage;
+		return $res;
+	}
+	else {
+		return $origsubs{'urlto'}->($to,$from,$absolute)
 	}
+} #}}}
+
+sub mynicepagetitle ($;$) { #{{{
+	my ($page, $unescaped) = (shift, shift);
+
+	my $res = $origsubs{'nicepagetitle'}->($page, $unescaped);
+	return $res unless istranslation($page);
+	return $res." (".percenttranslated($page).")";
+} #}}}
+
+# ,----
+# | Blackboxes for private data
+# `----
+
+{
+	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}{$destpage};
+		}
+	} #}}}
+
+	sub resetalreadyfiltered() { #{{{
+		undef %filtered;
+	} #}}}
+}
+
+# ,----
+# | Helper functions
+# `----
+
+sub maybe_add_leading_slash ($;$) { #{{{
+	my $str=shift;
+	my $add=shift;
+	$add=1 unless defined $add;
+	return '/' . $str if $add;
+	return $str;
+} #}}}
+
+sub istranslatablefile ($) { #{{{
+	my $file=shift;
+
+	return 0 unless defined $file;
+	return 0 if (defined pagetype($file) && pagetype($file) eq 'po');
+	return 0 if $file =~ /\.pot$/;
+	return 1 if pagespec_match(pagename($file), $config{po_translatable_pages});
+	return;
+} #}}}
+
+sub istranslatable ($) { #{{{
+	my $page=shift;
+
+	$page=~s#^/##;
+	return 1 if istranslatablefile($pagesources{$page});
+	return;
+} #}}}
+
+sub _istranslation ($) { #{{{
+	my $page=shift;
+
+	my $hasleadingslash = ($page=~s#^/##);
+	my $file=$pagesources{$page};
+	return 0 unless (defined $file
+			 && defined pagetype($file)
+			 && pagetype($file) eq 'po');
+	return 0 if $file =~ /\.pot$/;
 
 	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 0 unless (defined $masterpage && defined $lang
+			 && length $masterpage && length $lang
+			 && defined $pagesources{$masterpage}
+			 && defined $config{po_slave_languages}{$lang});
 
-	return ($masterpage, $lang) if istranslatable($masterpage);
+	return (maybe_add_leading_slash($masterpage, $hasleadingslash), $lang)
+		if istranslatable($masterpage);
 } #}}}
 
 sub istranslation ($) { #{{{
 	my $page=shift;
 
 	if (1 < (my ($masterpage, $lang) = _istranslation($page))) {
+		my $hasleadingslash = ($masterpage=~s#^/##);
 		$translations{$masterpage}{$lang}=$page unless exists $translations{$masterpage}{$lang};
-		return ($masterpage, $lang);
+		return (maybe_add_leading_slash($masterpage, $hasleadingslash), $lang);
 	}
 	return;
 } #}}}
@@ -694,6 +610,250 @@ sub lang ($) { #{{{
 	return $config{po_master_language}{code};
 } #}}}
 
+sub islanguagecode ($) { #{{{
+	my $code=shift;
+
+	return ($code =~ /^[a-z]{2}$/);
+} #}}}
+
+sub otherlanguage ($$) { #{{{
+	my $page=shift;
+	my $code=shift;
+
+	return masterpage($page) if $code eq $config{po_master_language}{code};
+	return masterpage($page) . '.' . $code;
+} #}}}
+
+sub otherlanguages ($) { #{{{
+	my $page=shift;
+
+	my %ret;
+	return \%ret unless (istranslation($page) || istranslatable($page));
+	my $curlang=lang($page);
+	foreach my $lang
+		($config{po_master_language}{code}, keys %{$config{po_slave_languages}}) {
+		next if $lang eq $curlang;
+		$ret{$lang}=otherlanguage($page, $lang);
+	}
+	return \%ret;
+} #}}}
+
+sub potfile ($) { #{{{
+	my $masterfile=shift;
+
+	(my $name, my $dir, my $suffix) = fileparse($masterfile, qr/\.[^.]*/);
+	$dir='' if $dir eq './';
+	return File::Spec->catpath('', $dir, $name . ".pot");
+} #}}}
+
+sub pofile ($$) { #{{{
+	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 flushmemoizecache() { #{{{
+	Memoize::flush_cache("istranslatable");
+	Memoize::flush_cache("_istranslation");
+	Memoize::flush_cache("percenttranslated");
+} #}}}
+
+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 percenttranslated ($) { #{{{
+	my $page=shift;
+
+	return gettext("N/A") unless istranslation($page);
+	my $file=srcfile($pagesources{$page});
+	my $masterfile = srcfile($pagesources{masterpage($page)});
+	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 languagename ($) { #{{{
+	my $code=shift;
+
+	return $config{po_master_language}{name}
+		if $code eq $config{po_master_language}{code};
+	return $config{po_slave_languages}{$code}
+		if defined $config{po_slave_languages}{$code};
+	return;
+} #}}}
+
+sub otherlanguagesloop ($) { #{{{
+	my $page=shift;
+
+	my @ret;
+	my %otherpages=%{otherlanguages($page)};
+	while (my ($lang, $otherpage) = each %otherpages) {
+		if (istranslation($page) && masterpage($page) eq $otherpage) {
+			push @ret, {
+				url => urlto_with_orig_beautiful_urlpath($otherpage, $page),
+				code => $lang,
+				language => languagename($lang),
+				master => 1,
+			};
+		}
+		else {
+			push @ret, {
+				url => urlto_with_orig_beautiful_urlpath($otherpage, $page),
+				code => $lang,
+				language => languagename($lang),
+				percent => percenttranslated($otherpage),
+			}
+		}
+	}
+	return sort {
+			return -1 if $a->{code} eq $config{po_master_language}{code};
+			return 1 if $b->{code} eq $config{po_master_language}{code};
+			return $a->{language} cmp $b->{language};
+		} @ret;
+} #}}}
+
+sub homepageurl (;$) { #{{{
+	my $page=shift;
+
+	return urlto('', $page);
+} #}}}
+
+sub deletetranslations ($) { #{{{
+	my $deletedmasterfile=shift;
+
+	my $deletedmasterpage=pagename($deletedmasterfile);
+	my @todelete;
+	map {
+		my $file = newpagefile($deletedmasterpage.'.'.$_, 'po');
+		my $absfile = "$config{srcdir}/$file";
+		if (-e $absfile && ! -l $absfile && ! -d $absfile) {
+			push @todelete, $file;
+		}
+	} keys %{$config{po_slave_languages}};
+
+	map {
+		if ($config{rcs}) {
+			IkiWiki::rcs_remove($_);
+		}
+		else {
+			IkiWiki::prune("$config{srcdir}/$_");
+		}
+	} @todelete;
+
+	if (scalar @todelete) {
+		commit_and_refresh(
+			gettext("removed obsolete PO files"),
+			"IkiWiki::Plugin::po::deletetranslations");
+	}
+} #}}}
+
+sub commit_and_refresh ($$) { #{{{
+	my ($msg, $author) = (shift, shift);
+
+	if ($config{rcs}) {
+		IkiWiki::disable_commit_hook();
+		IkiWiki::rcs_commit_staged($msg, $author, "127.0.0.1");
+		IkiWiki::enable_commit_hook();
+		IkiWiki::rcs_update();
+	}
+	# Reinitialize module's private variables.
+	resetalreadyfiltered();
+	resettranslationscache();
+	flushmemoizecache();
+	# Trigger a wiki refresh.
+	require IkiWiki::Render;
+	# without preliminary saveindex/loadindex, refresh()
+	# complains about a lot of uninitialized variables
+	IkiWiki::saveindex();
+	IkiWiki::loadindex();
+	IkiWiki::refresh();
+	IkiWiki::saveindex();
+} #}}}
+
+# ,----
+# | PageSpec's
+# `----
+
 package IkiWiki::PageSpec;
 use warnings;
 use strict;
@@ -726,16 +886,7 @@ sub match_lang ($$;@) { #{{{
 	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};
-	}
-
+	my $lang=IkiWiki::Plugin::po::lang($page);
 	if ($lang!~/^$regexp$/i) {
 		return IkiWiki::FailReason->new("file language is $lang, not $wanted");
 	}
@@ -746,26 +897,13 @@ sub match_lang ($$;@) { #{{{
 
 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};
-	}
+	my $currentlang=IkiWiki::Plugin::po::lang($params{location});
+	my $lang=IkiWiki::Plugin::po::lang($page);
 
 	if ($lang eq $currentlang) {
 		return IkiWiki::SuccessReason->new("file language is the same as current one, i.e. $currentlang");