my %translations;
my @origneedsbuild;
+my %origsubs;
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);
inject(name => "IkiWiki::urlto", call => \&myurlto);
} #}}}
+
+# ,----
+# | 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",
},
} #}}}
-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}) {
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;
}
} #}}}
+# 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};
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}{$destpage};
- }
- } #}}}
-
- sub resetalreadyfiltered() { #{{{
- undef %filtered;
- } #}}}
-}
-
# We use filter to convert PO to the master page's format,
# since the rest of ikiwiki should not work on PO files.
sub filter (@) { #{{{
return IkiWiki::htmlize($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 pagetemplate (@) { #{{{
+ my %params=@_;
+ my $page=$params{page};
+ my $destpage=$params{destpage};
+ my $template=$params{template};
-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($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 pagetemplate (@) { #{{{
- my %params=@_;
- my $page=$params{page};
- my $destpage=$params{destpage};
- my $template=$params{template};
-
- my ($masterpage, $lang) = istranslation($page);
+ my ($masterpage, $lang) = istranslation($page);
if (istranslation($page) && $template->query(name => "percenttranslated")) {
$template->param(percenttranslated => percenttranslated($page));
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)});
resettranslationscache();
# 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();
}
} #}}}
+# 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};
} #}}}
+
+# ,----
+# | Injected functions
+# `----
+
+# Implement po_link_to=current
+sub mybestlink ($$) { #{{{
+ my $page=shift;
+ my $link=shift;
+
+ my $res=$origsubs{'bestlink'}->($page, $link);
+ if (length $res
+ && $config{po_link_to} eq "current"
+ && istranslatable($res)
+ && istranslation($page)) {
+ return $res . "." . lang($page);
+ }
+ return $res;
+} #}}}
+
+sub mybeautify_urlpath ($) { #{{{
+ my $url=shift;
+
+ my $res=$origsubs{'beautify_urlpath'}->($url);
+ if ($config{po_link_to} eq "negotiated") {
+ $res =~ s!/\Qindex.$config{po_master_language}{code}.$config{htmlext}\E$!/!;
+ $res =~ s!/\Qindex.$config{htmlext}\E$!/!;
+ }
+ return $res;
+} #}}}
+
+sub mytargetpage ($$) { #{{{
+ my $page=shift;
+ my $ext=shift;
+
+ if (istranslation($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 ($$;$) { #{{{
+ my $to=shift;
+ my $from=shift;
+ my $absolute=shift;
+
+ # workaround hard-coded /index.$config{htmlext} in IkiWiki::urlto()
+ if (! length $to
+ && $config{po_link_to} eq "current"
+ && istranslatable('index')) {
+ return IkiWiki::beautify_urlpath(IkiWiki::baseurl($from) . "index." . lang($from) . ".$config{htmlext}");
+ }
+ return $origsubs{'urlto'}->($to,$from,$absolute);
+} #}}}
+
+
+# ,----
+# | Blackboxes for private data
+# `----
+
+{
+ my %filtered;
+
+ sub alreadyfiltered($$) { #{{{
+ 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}{$destpage};
+ }
+ } #}}}
+
+ sub resetalreadyfiltered() { #{{{
+ undef %filtered;
+ } #}}}
+}
+
+
+# ,----
+# | Helper functions
+# `----
+
sub istranslatable ($) { #{{{
my $page=shift;
my $file=$pagesources{$page};
- if (! defined $file
- || (defined pagetype($file) && pagetype($file) eq 'po')
- || $file =~ /\.pot$/) {
- return 0;
- }
+ return 0 unless defined $file;
+ return 0 if (defined pagetype($file) && pagetype($file) eq 'po');
+ return 0 if $file =~ /\.pot$/;
return pagespec_match($page, $config{po_translatable_pages});
} #}}}
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;
- }
+ 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 $config{po_master_language}{code};
} #}}}
+sub islanguagecode ($) { #{{{
+ my $code=shift;
+
+ return ($code =~ /^[a-z]{2}$/);
+} #}}}
+
+sub otherlanguages($) { #{{{
+ 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 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($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);
+} #}}}
+
+# ,----
+# | PageSpec's
+# `----
+
package IkiWiki::PageSpec;
use warnings;
use strict;
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");
}
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");