+
+ return 1 if $origsubs{'isselflink'}->($page, $link);
+ if (istranslation($page)) {
+ return $origsubs{'isselflink'}->(masterpage($page), $link);
+ }
+ return;
+}
+
+# ,----
+# | 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($$) {
+ my $page=shift;
+ my $destpage=shift;
+
+ if (exists $filtered{$page}{$destpage}) {
+ delete $filtered{$page}{$destpage};
+ }
+ }
+
+ sub resetalreadyfiltered() {
+ undef %filtered;
+ }
+}
+
+# ,----
+# | Helper functions
+# `----
+
+sub maybe_add_leading_slash ($;$) {
+ my $str=shift;
+ my $add=shift;
+ $add=1 unless defined $add;
+ return '/' . $str if $add;
+ return $str;
+}
+
+sub istranslatablefile ($) {
+ my $file=shift;
+
+ return 0 unless defined $file;
+ my $type=pagetype($file);
+ return 0 if ! defined $type || $type eq 'po';
+ return 0 if $file =~ /\.pot$/;
+ return 0 if ! defined $config{po_translatable_pages};
+ return 1 if pagespec_match(pagename($file), $config{po_translatable_pages});
+ return;
+}
+
+sub istranslatable ($) {
+ my $page=shift;
+
+ $page=~s#^/##;
+ return 1 if istranslatablefile($pagesources{$page});
+ return;
+}
+
+sub istranslatedto ($$) {
+ my $page=shift;
+ my $destlang = shift;
+
+ $page=~s#^/##;
+ return 0 unless istranslatable($page);
+ exists $pagesources{otherlanguage_page($page, $destlang)};
+}
+
+sub _istranslation ($) {
+ my $page=shift;
+
+ $page='' unless defined $page && length $page;
+ 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 =~ /(.*)[.]($language_code_pattern)$/);
+ return 0 unless defined $masterpage && defined $lang
+ && length $masterpage && length $lang
+ && defined $pagesources{$masterpage}
+ && defined $slavelanguages{$lang};
+
+ 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}{$lang};
+ return (maybe_add_leading_slash($masterpage, $hasleadingslash), $lang);
+ }
+ return "";
+}
+
+sub masterpage ($) {
+ my $page=shift;
+
+ if ( 1 < (my ($masterpage, $lang) = _istranslation($page))) {
+ return $masterpage;
+ }
+ return $page;
+}
+
+sub lang ($) {
+ my $page=shift;
+
+ if (1 < (my ($masterpage, $lang) = _istranslation($page))) {
+ return $lang;
+ }
+ return $master_language_code;
+}
+
+sub htmllangcode ($) {
+ (my $lang = shift) =~ tr/_/-/;
+ return $lang;
+}
+
+sub htmllangdir ($) {
+ my $lang = shift;
+ if ($lang =~ /^(ar|fa|he)/) {
+ return 'rtl';
+ }
+ return 'ltr';
+}
+
+sub islanguagecode ($) {
+ my $code=shift;
+
+ return $code =~ /^$language_code_pattern$/;
+}
+
+sub otherlanguage_page ($$) {
+ my $page=shift;
+ my $code=shift;
+
+ return masterpage($page) if $code eq $master_language_code;
+ return masterpage($page) . '.' . $code;
+}
+
+# Returns the list of other languages codes: the master language comes first,
+# then the codes are ordered the same way as in po_slave_languages, if it is
+# an array, or in the language name lexical order, if it is a hash.
+sub otherlanguages_codes ($) {
+ my $page=shift;
+
+ my @ret;
+ return \@ret unless istranslation($page) || istranslatable($page);
+ my $curlang=lang($page);
+ foreach my $lang
+ ($master_language_code, @slavelanguages) {
+ next if $lang eq $curlang;
+ if ($lang eq $master_language_code ||
+ istranslatedto(masterpage($page), $lang)) {
+ push @ret, $lang;
+ }
+ }
+ return \@ret;
+}
+
+sub otherlanguages_pages ($) {
+ my $page=shift;
+
+ my %ret;
+ map {
+ $ret{$_} = otherlanguage_page($page, $_)
+ } @{otherlanguages_codes($page)};
+
+ return \%ret;
+}
+
+sub potfile ($) {
+ my $masterfile=shift;
+
+ (my $name, my $dir, my $suffix) = fileparse($masterfile, qr/\.[^.]*/);
+ $dir='' if $dir eq './';
+ return File::Spec->catpath('', $dir, $name . ".pot");
+}
+
+sub pofile ($$) {
+ 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, $_), @slavelanguages;
+}
+
+sub refreshpot ($) {
+ my $masterfile=shift;
+
+ my $potfile=potfile($masterfile);
+ my $doc=Locale::Po4a::Chooser::new(po4a_type($masterfile),
+ po4a_options($masterfile));
+ $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.
+ $doc->{TT}{po_out}=Locale::Po4a::Po->new({ 'porefs' => 'none' });
+ $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);
+ if (! -e $potfile) {
+ error("po(refreshpofiles) ".sprintf(gettext("POT file (%s) does not exist"), $potfile));
+ }
+
+ foreach my $pofile (@pofiles) {
+ IkiWiki::prep_writefile(basename($pofile),dirname($pofile));
+
+ if (! -e $pofile) {
+ # If the po file exists in an underlay, copy it
+ # from there.
+ my ($pobase)=$pofile=~/^\Q$config{srcdir}\E\/?(.*)$/;
+ foreach my $dir (@{$config{underlaydirs}}) {
+ if (-e "$dir/$pobase") {
+ File::Copy::syscopy("$dir/$pobase",$pofile)
+ or error("po(refreshpofiles) ".
+ sprintf(gettext("failed to copy underlay PO file to %s"),
+ $pofile));
+ }
+ }
+ }
+
+ if (-e $pofile) {
+ if (! (system("msgmerge", "--previous", "-q", "-U", "--backup=none", $pofile, $potfile) == 0)) {
+ print STDERR ("po(refreshpofiles) ". sprintf(gettext("failed to update %s"), $pofile));
+ }