* Patch from Dr. Zini to add link() and backlink() to globlists. This allows

for some handy stuff like:
  - Using links as a kind of tag; creating blog pages that list all pages
    containing a given tag/link or not containing some other tag.
  - Subscribing to mail notifications whenever a change is made to a page
    that is a backlink of page foo. Ie, "Please notify me of changes in all
    pages that link to my home page in the wiki"
  - Locking any pages that are linked to from a particular page, so that
    lists of locks can be exposed in the wiki.

IkiWiki.pm

@@ -401,13 +401,27 @@ sub glob_match ($$) { #{{{
 	my $page=shift;
 	my $glob=shift;
 
+	if ($glob =~ /^link\((.+)\)$/) {
+		my $rev = $links{$page} or return undef;
+		foreach my $p (@$rev) {
+			return 1 if lc $p eq $1;
+		}
+		return 0;
+	} elsif ($glob =~ /^backlink\((.+)\)$/) {
+		my $rev = $links{$1} or return undef;
+		foreach my $p (@$rev) {
+			return 1 if lc $p eq $page;
+		}
+		return 0;
+	} else {
 		# turn glob into safe regexp
 		$glob=quotemeta($glob);
 		$glob=~s/\\\*/.*/g;
 		$glob=~s/\\\?/./g;
 		$glob=~s!\\/!/!g;
 		
-	$page=~/^$glob$/i;
+		return $page=~/^$glob$/i;
+	}
 } #}}}
 
 sub globlist_match ($$) { #{{{

basewiki/blog.mdwn

@@ -20,3 +20,14 @@ You can even create an automatically generated list of all the pages on the
 wiki, with the most recently added at the top, like this:
 
 	\\[[inline pages="* !*/Discussion" archive="yes"]]
+
+If you want to be able to add pages to a given blog feed by tagging them,
+you can do that too. To tag a page, just make it link to a page or pages 
+that represent its tags. Then use the special link() [[GlobList]] to match
+all pages that have a given tag:
+
+	\\[[inline pages="link(life)"]]
+
+Or include some tags and exclude others:
+
+	\\[[inline pages="link(debian) !link(social)"]]

basewiki/globlist.mdwn

@@ -14,3 +14,7 @@ pages that match it. So if you want to specify all pages except for
 Discussion pages and the SandBox:
 
 	* !SandBox !*/Discussion
+
+It's also possible to match pages that link to a given page, by writing
+"link(page)" in a globlist. Or, match pages that a given page links to, by
+writing "backlink(page)".

debian/changelog

@@ -4,8 +4,17 @@ ikiwiki (1.5) UNRELEASED; urgency=low
     Note that as a side effect, dates will now be displayed using the local
     timezone, not as GMT.
   * More security review.
+  * Patch from Dr. Zini to add link() and backlink() to globlists. This allows
+    for some handy stuff like:
+    - Using links as a kind of tag; creating blog pages that list all pages
+      containing a given tag/link or not containing some other tag.
+    - Subscribing to mail notifications whenever a change is made to a page
+      that is a backlink of page foo. Ie, "Please notify me of changes in all
+      pages that link to my home page in the wiki"
+    - Locking any pages that are linked to from a particular page, so that
+      lists of locks can be exposed in the wiki.
 
- -- Joey Hess <joeyh@debian.org>  Thu,  1 Jun 2006 15:12:29 -0400
+ -- Joey Hess <joeyh@debian.org>  Thu,  1 Jun 2006 20:56:58 -0400
 
 ikiwiki (1.4) unstable; urgency=low
 

doc/features.mdwn

@@ -37,12 +37,14 @@ Some of ikiwiki's features:
 
 * [[blog]]s
 
-  You can turn any page in the wiki into a [[blog]]. Pages with names 
-  matching a specified [[GlobList]] will be displayed as a weblog within
-  the blog page. And an RSS feed can be generated to follow the blog.
+  You can turn any page in the wiki into a [[blog]]. Pages matching a
+  specified [[GlobList]] will be displayed as a weblog within the blog
+  page. And an RSS feed can be generated to follow the blog.
 
-  Ikiwiki's own [[TODO]], [[news]], and [[plugins]] pages are good examples of some of
-  the flexible ways that this can be used.
+  Ikiwiki's own [[TODO]], [[news]], and [[plugins]] pages are good examples
+  of some of the flexible ways that this can be used.
+
+  Note that this also includes support for tag-based blogging.
 
 * Fast compiler