X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/37b8822762ba8a2096adae18997e406023deddf3..dcb52530910306891622bbaff9e039b52e83b0fc:/IkiWiki/Plugin/po.pm?ds=sidebyside

diff --git a/IkiWiki/Plugin/po.pm b/IkiWiki/Plugin/po.pm
index 77439a3ca..9a3df79ac 100644
--- a/IkiWiki/Plugin/po.pm
+++ b/IkiWiki/Plugin/po.pm
@@ -1,15 +1,16 @@
 #!/usr/bin/perl
 # .po as a wiki page type
 # Licensed under GPL v2 or greater
-# Copyright (C) 2008 intrigeri <intrigeri@boum.org>
+# Copyright (C) 2008-2009 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 IkiWiki 3.00;
 use Encode;
+use Locale::Po4a::Common qw(nowrapi18n);
 use Locale::Po4a::Chooser;
 use Locale::Po4a::Po;
 use File::Basename;
@@ -35,11 +36,15 @@ 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 => "postscan", id => "po", call => \&postscan);
-	hook(type => "rename", id => "po", call => \&renamepages);
+	hook(type => "rename", id => "po", call => \&renamepages, first => 1);
 	hook(type => "delete", id => "po", call => \&mydelete);
 	hook(type => "change", id => "po", call => \&change);
+	hook(type => "checkcontent", id => "po", call => \&checkcontent);
+	hook(type => "canremove", id => "po", call => \&canremove);
+	hook(type => "canrename", id => "po", call => \&canrename);
 	hook(type => "editcontent", id => "po", call => \&editcontent);
+	hook(type => "formbuilder_setup", id => "po", call => \&formbuilder_setup, last => 1);
+	hook(type => "formbuilder", id => "po", call => \&formbuilder);
 
 	$origsubs{'bestlink'}=\&IkiWiki::bestlink;
 	inject(name => "IkiWiki::bestlink", call => \&mybestlink);
@@ -49,8 +54,8 @@ 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);
+	$origsubs{'cgiurl'}=\&IkiWiki::cgiurl;
+	inject(name => "IkiWiki::cgiurl", call => \&mycgiurl);
 }
 
 
@@ -62,7 +67,7 @@ sub import {
 # 2. Injected functions
 # 3. Blackboxes for private data
 # 4. Helper functions
-# 5. PageSpec's
+# 5. PageSpecs
 
 
 # ,----
@@ -111,23 +116,18 @@ sub getsetup () {
 			safe => 1,
 			rebuild => 1,
 		},
-		po_translation_status_in_links => {
-			type => "boolean",
-			example => 1,
-			description => "display translation status in links to translations",
-			safe => 1,
-			rebuild => 1,
-		},
 }
 
 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));
+			error(sprintf(gettext("Must specify %s when using the %s plugin"),
+				      $field, 'po'));
 		}
 	}
 	if (! (keys %{$config{po_slave_languages}})) {
-		error(gettext("At least one slave language must be defined in po_slave_languages"));
+		error(gettext("At least one slave language must be defined ".
+			      "in po_slave_languages when using the po plugin"));
 	}
 	map {
 		islanguagecode($_)
@@ -144,18 +144,14 @@ sub checkconfig () {
 	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}));
+		warn(sprintf(gettext('%s is not a valid value for po_link_to, 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';
 	}
-	if (! exists $config{po_translation_status_in_links} ||
-	    ! defined $config{po_translation_status_in_links}) {
-		$config{po_translation_status_in_links}=1;
-	}
 	push @{$config{wiki_file_prune_regexps}}, qr/\.pot$/;
 }
 
@@ -221,50 +217,11 @@ sub filter (@) {
 
 	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;
-
-	# 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 $masterfile = srcfile($pagesources{masterpage($page)});
-	my %options = (
-		"markdown" => (pagetype($masterfile) eq 'mdwn') ? 1 : 0,
-	);
-	my $doc=Locale::Po4a::Chooser::new('text',%options);
-	$doc->process(
-		'po_in_name'	=> [ $infile ],
-		'file_in_name'	=> [ $masterfile ],
-		'file_in_charset'  => 'utf-8',
-		'file_out_charset' => 'utf-8',
-	) or error("[po/filter:$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);
+	my $content = $params{content};
+	if (istranslation($page) && ! alreadyfiltered($page, $destpage)) {
+		$content = po_to_markup($page, $content);
+		setalreadyfiltered($page, $destpage);
+	}
 	return $content;
 }
 
@@ -279,8 +236,8 @@ sub htmlize (@) {
 
 	# 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)})),
-				$content);
+		pagetype(srcfile($pagesources{masterpage($page)})),
+		$content);
 }
 
 sub pagetemplate (@) {
@@ -316,13 +273,13 @@ sub pagetemplate (@) {
 	# 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"),
-							));
+			$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
@@ -334,26 +291,31 @@ sub pagetemplate (@) {
 	}
 } # }}}
 
-sub postscan (@) {
-	my %params = @_;
-	my $page = $params{page};
-
-	# backlinks involve back-dependencies, so that nicepagetitle effects,
-	# such as translation status displayed in links, are updated
-	use IkiWiki::Render;
-	map add_depends($page, $_), keys %{$IkiWiki::backlinks{$page}};
-}
-
 # Add the renamed page translations to the list of to-be-renamed pages.
-sub renamepages() {
-	my $torename=shift;
-	my @torename=@{$torename};
+sub renamepages(@) {
+	my %params = @_;
 
+	my @torename = @{$params{torename}};
+	my $session = $params{session};
+
+	# Save the page(s) the user asked to rename, so that our
+	# canrename hook can tell the difference between:
+	#  - a translation being renamed as a consequence of its master page
+	#    being renamed
+	#  - a user trying to directly rename a translation
+	# This is why this hook has to be run first, before the list of pages
+	# to rename is modified by other plugins.
+	$session->param(po_orig_torename => \@torename);
+	IkiWiki::cgi_savesession($session);
+
+	my @ret=@torename;
+	# iterate on @torename and push onto @ret, so that we don't iterate
+	# on the items we added ourselves
 	foreach my $rename (@torename) {
 		next unless istranslatable($rename->{src});
 		my %otherpages=%{otherlanguages($rename->{src})};
 		while (my ($lang, $otherpage) = each %otherpages) {
-			push @{$torename}, {
+			push @ret, {
 				src => $otherpage,
 				srcfile => $pagesources{$otherpage},
 				dest => otherlanguage($rename->{dest}, $lang),
@@ -362,6 +324,7 @@ sub renamepages() {
 			};
 		}
 	}
+	return @ret;
 }
 
 sub mydelete(@) {
@@ -373,6 +336,42 @@ sub mydelete(@) {
 sub change(@) {
 	my @rendered=@_;
 
+	# All meta titles are first extracted at scan time, i.e. before we turn
+	# PO files back into translated markdown; escaping of double-quotes in
+	# PO files breaks the meta plugin's parsing enough to save ugly titles
+	# to %pagestate at this time.
+	#
+	# Then, at render time, every page's passes on row through the Great
+	# Rendering Chain (filter->preprocess->linkify->htmlize), and the meta
+	# plugin's preprocess hook is this time in a position to correctly
+	# extract the titles from slave pages.
+	#
+	# This is, unfortunately, too late: if the page A, linking to the page B,
+	# is rendered before B, it will display the wrongly-extracted meta title
+	# as the link text to B.
+	#
+	# On the one hand, such a corner case only happens on rebuild: on
+	# refresh, every rendered page is fixed to contain correct meta titles.
+	# On the other hand, it can take some time to get every page fixed.
+	# We therefore re-render every rendered page after a rebuild to fix them
+	# at once. As this more or less doubles the time needed to rebuild the
+	# wiki, we do so only when really needed.
+
+	if (@rendered
+	    && exists $config{rebuild} && defined $config{rebuild} && $config{rebuild}
+	    && UNIVERSAL::can("IkiWiki::Plugin::meta", "getsetup")
+	    && exists $config{meta_overrides_page_title}
+	    && defined $config{meta_overrides_page_title}
+	    && $config{meta_overrides_page_title}) {
+		debug(sprintf(gettext("re-rendering all pages to fix meta titles")));
+		resetalreadyfiltered();
+		require IkiWiki::Render;
+		foreach my $file (@rendered) {
+			debug(sprintf(gettext("rendering %s"), $file));
+			IkiWiki::render($file);
+		}
+	}
+
 	my $updated_po_files=0;
 
 	# Refresh/create POT and PO files as needed.
@@ -406,6 +405,52 @@ sub change(@) {
 	}
 }
 
+sub checkcontent (@) {
+	my %params=@_;
+
+	if (istranslation($params{page})) {
+		my $res = isvalidpo($params{content});
+		if ($res) {
+			return undef;
+		}
+		else {
+			return "$res";
+		}
+	}
+	return undef;
+}
+
+sub canremove (@) {
+	my %params = @_;
+
+	if (istranslation($params{page})) {
+		return gettext("Can not remove a translation. Removing the master page, ".
+			       "though, removes its translations as well.");
+	}
+	return undef;
+}
+
+sub canrename (@) {
+	my %params = @_;
+	my $session = $params{session};
+
+	if (istranslation($params{src})) {
+		my $masterpage = masterpage($params{src});
+		# Tell the difference between:
+		#  - a translation being renamed as a consequence of its master page
+		#    being renamed, which is allowed
+		#  - a user trying to directly rename a translation, which is forbidden
+		# by looking for the master page in the list of to-be-renamed pages we
+		# saved early in the renaming process.
+		my $orig_torename = $session->param("po_orig_torename");
+		unless (grep { $_->{src} eq $masterpage } @{$orig_torename}) {
+			return gettext("Can not rename a translation. Renaming the master page, ".
+				       "though, renames its translations as well.");
+		}
+	}
+	return undef;
+}
+
 # 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 () {
@@ -415,6 +460,62 @@ sub editcontent () {
 	return $params{content};
 }
 
+sub formbuilder_setup (@) {
+	my %params=@_;
+	my $form=$params{form};
+	my $q=$params{cgi};
+
+	return unless defined $form->field("do");
+
+	if ($form->field("do") eq "create") {
+		# Warn the user: new pages must be written in master language.
+		my $template=template("pocreatepage.tmpl");
+		$template->param(LANG => $config{po_master_language}{name});
+		$form->tmpl_param(message => $template->output);
+	}
+	elsif ($form->field("do") eq "edit") {
+		# Remove the rename/remove buttons on slave pages.
+		# This has to be done after the rename/remove plugins have added
+		# their buttons, which is why this hook must be run last.
+		# The canrename/canremove hooks already ensure this is forbidden
+		# at the backend level, so this is only UI sugar.
+		if (istranslation($form->field("page"))) {
+			map {
+				for (my $i = 0; $i < @{$params{buttons}}; $i++) {
+					if (@{$params{buttons}}[$i] eq $_) {
+						delete  @{$params{buttons}}[$i];
+						last;
+					}
+				}
+			} qw(Rename Remove);
+		}
+	}
+}
+
+sub formbuilder (@) {
+	my %params=@_;
+	my $form=$params{form};
+	my $q=$params{cgi};
+
+	return unless defined $form->field("do");
+
+	# Do not allow to create pages of type po: they are automatically created.
+	# The main reason to do so is to bypass the "favor the type of linking page
+	# on page creation" logic, which is unsuitable when a broken link is clicked
+	# on a slave (PO) page.
+	# This cannot be done in the formbuilder_setup hook as the list of types is
+	# computed later.
+	if ($form->field("do") eq "create") {
+	        foreach my $field ($form->field) {
+			next unless "$field" eq "type";
+			if ($field->type eq 'select') {
+				# remove po from the list of types
+				my @types = grep { $_ ne 'po' } $field->options;
+				$field->options(\@types) if @types;
+			}
+		}
+	}
+}
 
 # ,----
 # | Injected functions
@@ -483,7 +584,9 @@ sub myurlto ($$;$) {
 	# avoid, i.e. when po_link_to = negotiated
 	if ($config{po_link_to} eq "negotiated") {
 		my @caller = caller(1);
-		my $run_by_editpage = ($caller[3] eq "IkiWiki::cgi_editpage");
+		my $run_by_editpage = 0;
+		$run_by_editpage = 1 if (exists $caller[3] && defined $caller[3]
+					 && $caller[3] eq "IkiWiki::cgi_editpage");
 		inject(name => "IkiWiki::beautify_urlpath", call => $origsubs{'beautify_urlpath'})
 			if $run_by_editpage;
 		my $res = $origsubs{'urlto'}->($to,$from,$absolute);
@@ -496,13 +599,14 @@ sub myurlto ($$;$) {
 	}
 }
 
-sub mynicepagetitle ($;$) {
-	my ($page, $unescaped) = (shift, shift);
+sub mycgiurl (@) {
+	my %params=@_;
 
-	my $res = $origsubs{'nicepagetitle'}->($page, $unescaped);
-	return $res unless istranslation($page);
-	return $res unless $config{po_translation_status_in_links};
-	return $res.' ('.percenttranslated($page).' %)';
+	# slave pages have no subpages
+	if (istranslation($params{'from'})) {
+		$params{'from'} = masterpage($params{'from'});
+	}
+	return $origsubs{'cgiurl'}->(%params);
 }
 
 # ,----
@@ -516,8 +620,8 @@ sub mynicepagetitle ($;$) {
 		my $page=shift;
 		my $destpage=shift;
 
-		return ( exists $filtered{$page}{$destpage}
-			 && $filtered{$page}{$destpage} eq 1 );
+		return exists $filtered{$page}{$destpage}
+			 && $filtered{$page}{$destpage} eq 1;
 	}
 
 	sub setalreadyfiltered($$) {
@@ -557,8 +661,9 @@ sub istranslatablefile ($) {
 	my $file=shift;
 
 	return 0 unless defined $file;
-	return 0 if (defined pagetype($file) && pagetype($file) eq 'po');
+	return 0 if defined pagetype($file) && pagetype($file) eq 'po';
 	return 0 if $file =~ /\.pot$/;
+	return 0 unless -e "$config{srcdir}/$file"; # underlay dirs may be read-only
 	return 1 if pagespec_match(pagename($file), $config{po_translatable_pages});
 	return;
 }
@@ -574,18 +679,19 @@ sub istranslatable ($) {
 sub _istranslation ($) {
 	my $page=shift;
 
+	$page='' unless defined $page && length $page;
 	my $hasleadingslash = ($page=~s#^/##);
 	my $file=$pagesources{$page};
-	return 0 unless (defined $file
+	return 0 unless defined $file
 			 && defined pagetype($file)
-			 && pagetype($file) eq 'po');
+			 && pagetype($file) eq 'po';
 	return 0 if $file =~ /\.pot$/;
 
 	my ($masterpage, $lang) = ($page =~ /(.*)[.]([a-z]{2})$/);
-	return 0 unless (defined $masterpage && defined $lang
+	return 0 unless defined $masterpage && defined $lang
 			 && length $masterpage && length $lang
 			 && defined $pagesources{$masterpage}
-			 && defined $config{po_slave_languages}{$lang});
+			 && defined $config{po_slave_languages}{$lang};
 
 	return (maybe_add_leading_slash($masterpage, $hasleadingslash), $lang)
 		if istranslatable($masterpage);
@@ -599,7 +705,7 @@ sub istranslation ($) {
 		$translations{$masterpage}{$lang}=$page unless exists $translations{$masterpage}{$lang};
 		return (maybe_add_leading_slash($masterpage, $hasleadingslash), $lang);
 	}
-	return;
+	return "";
 }
 
 sub masterpage ($) {
@@ -623,7 +729,7 @@ sub lang ($) {
 sub islanguagecode ($) {
 	my $code=shift;
 
-	return ($code =~ /^[a-z]{2}$/);
+	return $code =~ /^[a-z]{2}$/;
 }
 
 sub otherlanguage ($$) {
@@ -638,7 +744,7 @@ sub otherlanguages ($) {
 	my $page=shift;
 
 	my %ret;
-	return \%ret unless (istranslation($page) || istranslatable($page));
+	return \%ret unless istranslation($page) || istranslatable($page);
 	my $curlang=lang($page);
 	foreach my $lang
 		($config{po_master_language}{code}, keys %{$config{po_slave_languages}}) {
@@ -697,17 +803,23 @@ sub refreshpofiles ($@) {
 	my @pofiles=@_;
 
 	my $potfile=potfile($masterfile);
-	error("[po/refreshpofiles] POT file ($potfile) does not exist") unless (-e $potfile);
+	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) {
 			system("msgmerge", "-U", "--backup=none", $pofile, $potfile) == 0
-				or error("[po/refreshpofiles:$pofile] failed to update");
+				or error("po(refreshpofiles) ".
+					 sprintf(gettext("failed to update %s"),
+						 $pofile));
 		}
 		else {
 			File::Copy::syscopy($potfile,$pofile)
-				or error("[po/refreshpofiles:$pofile] failed to copy the POT file");
+				or error("po(refreshpofiles) ".
+					 sprintf(gettext("failed to copy the POT file to %s"),
+						 $pofile));
 		}
 	}
 }
@@ -754,8 +866,10 @@ sub percenttranslated ($) {
 		'file_in_name'	=> [ $masterfile ],
 		'file_in_charset'  => 'utf-8',
 		'file_out_charset' => 'utf-8',
-	) or error("[po/percenttranslated:$page]: failed to translate");
+	) or error("po(percenttranslated) ".
+		   sprintf(gettext("failed to translate %s"), $page));
 	my ($percent,$hit,$queries) = $doc->stats();
+	$percent =~ s/\.[0-9]+$//;
 	return $percent;
 }
 
@@ -827,7 +941,7 @@ sub deletetranslations ($) {
 		}
 	} @todelete;
 
-	if (scalar @todelete) {
+	if (@todelete) {
 		commit_and_refresh(
 			gettext("removed obsolete PO files"),
 			"IkiWiki::Plugin::po::deletetranslations");
@@ -857,14 +971,116 @@ sub commit_and_refresh ($$) {
 	IkiWiki::saveindex();
 }
 
+# on success, returns the filtered content.
+# on error, if $nonfatal, warn and return undef; else, error out.
+sub po_to_markup ($$;$) {
+	my ($page, $content) = (shift, shift);
+	my $nonfatal = shift;
+
+	$content = '' unless defined $content;
+	$content = decode_utf8(encode_utf8($content));
+	# CRLF line terminators make poor Locale::Po4a feel bad
+	$content=~s/\r\n/\n/g;
+
+	# 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;
+
+	my $fail = sub ($) {
+		my $msg = "po(po_to_markup) - $page : " . shift;
+		if ($nonfatal) {
+			warn $msg;
+			return undef;
+		}
+		error($msg, sub { unlink $infile, $outfile});
+	};
+
+	writefile(basename($infile), File::Spec->tmpdir, $content)
+		or return $fail->(sprintf(gettext("failed to write %s"), $infile));
+
+	my $masterfile = srcfile($pagesources{masterpage($page)});
+	my %options = (
+		"markdown" => (pagetype($masterfile) eq 'mdwn') ? 1 : 0,
+	);
+	my $doc=Locale::Po4a::Chooser::new('text',%options);
+	$doc->process(
+		'po_in_name'	=> [ $infile ],
+		'file_in_name'	=> [ $masterfile ],
+		'file_in_charset'  => 'utf-8',
+		'file_out_charset' => 'utf-8',
+	) or return $fail->(gettext("failed to translate"));
+	$doc->write($outfile)
+		or return $fail->(sprintf(gettext("failed to write %s"), $outfile));
+
+	$content = readfile($outfile)
+		or return $fail->(sprintf(gettext("failed to read %s"), $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;
+
+	return $content;
+}
+
+# returns a SuccessReason or FailReason object
+sub isvalidpo ($) {
+	my $content = shift;
+
+	# NB: we don't use po_to_markup here, since Po4a parser does
+	# not mind invalid PO content
+	$content = '' unless defined $content;
+	$content = decode_utf8(encode_utf8($content));
+
+	# 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-isvalidpo.XXXXXXXXXX",
+				    DIR => File::Spec->tmpdir,
+				    UNLINK => 1)->filename;
+
+	my $fail = sub ($) {
+		my $msg = '[po/isvalidpo] ' . shift;
+		unlink $infile;
+		return IkiWiki::FailReason->new("$msg");
+	};
+
+	writefile(basename($infile), File::Spec->tmpdir, $content)
+		or return $fail->(sprintf(gettext("failed to write %s"), $infile));
+
+	my $res = (system("msgfmt", "--check", $infile, "-o", "/dev/null") == 0);
+
+	# 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 $infile;
+
+	if ($res) {
+	    return IkiWiki::SuccessReason->new("valid gettext data");
+	}
+	return IkiWiki::FailReason->new("invalid gettext data, go back ".
+					"to previous page to go on with edit");
+}
+
 # ,----
-# | PageSpec's
+# | PageSpecs
 # `----
 
 package IkiWiki::PageSpec;
-use warnings;
-use strict;
-use IkiWiki 2.00;
 
 sub match_istranslation ($;@) {
 	my $page=shift;
@@ -894,7 +1110,7 @@ sub match_lang ($$;@) {
 
 	my $regexp=IkiWiki::glob2re($wanted);
 	my $lang=IkiWiki::Plugin::po::lang($page);
-	if ($lang!~/^$regexp$/i) {
+	if ($lang !~ /^$regexp$/i) {
 		return IkiWiki::FailReason->new("file language is $lang, not $wanted");
 	}
 	else {