From 89df287aaa0a21d959dc2c179412a16ab08a7d51 Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@kitenet.net>
Date: Fri, 30 Mar 2012 13:38:52 -0400
Subject: [PATCH] meta: Support keywords header. Closes: #664780 Thanks, Martin
 Michlmayr

---
 IkiWiki/Plugin/meta.pm          | 7 +++++++
 debian/changelog                | 2 ++
 doc/ikiwiki/directive/meta.mdwn | 9 +++++++++
 3 files changed, 18 insertions(+)

diff --git a/IkiWiki/Plugin/meta.pm b/IkiWiki/Plugin/meta.pm
index 28b1a1ad6..b19ea2b32 100644
--- a/IkiWiki/Plugin/meta.pm
+++ b/IkiWiki/Plugin/meta.pm
@@ -285,6 +285,13 @@ sub preprocess (@) {
 			join(' ', map { "$_=\"$params{$_}\"" } keys %params).
 			' />', $page, $destpage);
 	}
+	elsif ($key eq 'keywords') {
+		# Make sure the keyword string is safe: only allow alphanumeric
+		# characters, space and comma and strip the rest.
+		$value =~ s/[^[:alnum:], ]+//g;
+		push @{$metaheaders{$page}}, '<meta name="keywords"'.
+			' content="'.encode_entities($value).'" />';
+	}
 	else {
 		push @{$metaheaders{$page}}, scrub('<meta name="'.
 			encode_entities($key).'" content="'.
diff --git a/debian/changelog b/debian/changelog
index 861679b4e..ca1f92116 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -9,6 +9,8 @@ ikiwiki (3.20120204) UNRELEASED; urgency=low
     changed pages.
   * Added a "changes" hook. Renamed the "change" hook to "rendered", but
     the old hook name is called for now for back-compat.
+  * meta: Support keywords header. Closes: #664780
+    Thanks, Martin Michlmayr
 
  -- Joey Hess <joeyh@debian.org>  Wed, 21 Mar 2012 14:33:14 -0400
 
diff --git a/doc/ikiwiki/directive/meta.mdwn b/doc/ikiwiki/directive/meta.mdwn
index f8494dbff..984f68540 100644
--- a/doc/ikiwiki/directive/meta.mdwn
+++ b/doc/ikiwiki/directive/meta.mdwn
@@ -59,6 +59,15 @@ Supported fields:
   Specifies a short description for the page. This will be put in
   the html header, and can also be displayed by eg, the [[map]] directive.
 
+* keywords
+
+  Specifies keywords summarizing the contents of the page. This
+  information will be put in the html header.  Only letters,
+  numbers, spaces and commas are allowed in this string; other
+  characters are stripped.  Note that the majority of search
+  engines, including Google, do not use information from the
+  keywords header.
+
 * permalink
 
   Specifies a permanent link to the page, if different than the page
-- 
2.26.2