From 34ab884242fd23139b7d4ccc9ab368468d501186 Mon Sep 17 00:00:00 2001
From: intrigeri <intrigeri@boum.org>
Date: Fri, 7 Nov 2008 21:27:00 +0100
Subject: po: implemented linking/backlinks specification for
 po_link_to=negotiated

Signed-off-by: intrigeri <intrigeri@boum.org>
---
 IkiWiki/Plugin/po.pm | 38 ++++++++++++++++++++++++++++++++++++++
 doc/plugins/po.mdwn  |  7 +------
 2 files changed, 39 insertions(+), 6 deletions(-)

diff --git a/IkiWiki/Plugin/po.pm b/IkiWiki/Plugin/po.pm
index 643621a91..acc133042 100644
--- a/IkiWiki/Plugin/po.pm
+++ b/IkiWiki/Plugin/po.pm
@@ -17,6 +17,7 @@ use File::Copy;
 use File::Spec;
 use File::Temp;
 use Memoize;
+use UNIVERSAL;
 
 my %translations;
 my @origneedsbuild;
@@ -36,6 +37,7 @@ 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);
@@ -218,6 +220,42 @@ sub needsbuild () { #{{{
 	}
 } #}}}
 
+sub scan (@) { #{{{
+	my %params=@_;
+	my $page=$params{page};
+	my $content=$params{content};
+
+	return unless UNIVERSAL::can("IkiWiki::Plugin::link", "import");
+	return unless $config{'po_link_to'} eq 'negotiated';
+
+	if (istranslation($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;
diff --git a/doc/plugins/po.mdwn b/doc/plugins/po.mdwn
index 4f6212ff4..a010dbb7e 100644
--- a/doc/plugins/po.mdwn
+++ b/doc/plugins/po.mdwn
@@ -249,12 +249,7 @@ be fixed by something like [[todo/using_meta_titles_for_parentlinks]].
 
 #### `po_link_to = negotiated`
 
-If a given translatable `sourcepage.mdwn` links to \[[destpage]],
-`sourcepage.LL.po` also link to \[[destpage]], and the latter has the
-master page *and* all its translations listed in the backlinks. On the
-other hand, translations of `destpage` get none of these backlinks.
-What would be nice is:
-
+This is now implemented:
 - if a translatable page links to another translatable page: the
   master destpage gets a backlink to the master sourcepage, and every
   slave destpage gets a backlink to the corresponding slave sourcepage
-- 
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