implement typed links; add tagged_is_strict config option

9 files changed, 193 insertions, 28 deletions

diff --git a/IkiWiki.pm b/IkiWiki.pm
index 6739ba56c..25e9247b2 100644
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -14,7 +14,7 @@ use open qw{:utf8 :std};
 use vars qw{%config %links %oldlinks %pagemtime %pagectime %pagecase
 	    %pagestate %wikistate %renderedfiles %oldrenderedfiles
 	    %pagesources %destsources %depends %depends_simple %hooks
-	    %forcerebuild %loaded_plugins};
+	    %forcerebuild %loaded_plugins %typedlinks %oldtypedlinks};
 
 use Exporter q{import};
 our @EXPORT = qw(hook debug error template htmlpage deptype
@@ -24,7 +24,7 @@ our @EXPORT = qw(hook debug error template htmlpage deptype
 		 add_underlay pagetitle titlepage linkpage newpagefile
 		 inject add_link
                  %config %links %pagestate %wikistate %renderedfiles
-                 %pagesources %destsources);
+                 %pagesources %destsources %typedlinks);
 our $VERSION = 3.00; # plugin interface version, next is ikiwiki version
 our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE
 our $installdir='/usr'; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
@@ -1503,7 +1503,7 @@ sub loadindex () {
 	if (! $config{rebuild}) {
 		%pagesources=%pagemtime=%oldlinks=%links=%depends=
 		%destsources=%renderedfiles=%pagecase=%pagestate=
-		%depends_simple=();
+		%depends_simple=%typedlinks=%oldtypedlinks=();
 	}
 	my $in;
 	if (! open ($in, "<", "$config{wikistatedir}/indexdb")) {
@@ -1569,6 +1569,14 @@ sub loadindex () {
 			if (exists $d->{state}) {
 				$pagestate{$page}=$d->{state};
 			}
+			if (exists $d->{typedlinks}) {
+				$typedlinks{$page}=$d->{typedlinks};
+
+				while (my ($type, $links) = each %{$typedlinks{$page}}) {
+					next unless %$links;
+					$oldtypedlinks{$page}{$type} = {%$links};
+				}
+			}
 		}
 		$oldrenderedfiles{$page}=[@{$d->{dest}}];
 	}
@@ -1617,6 +1625,10 @@ sub saveindex () {
 			$index{page}{$src}{depends_simple} = $depends_simple{$page};
 		}
 
+		if (exists $typedlinks{$page} && %{$typedlinks{$page}}) {
+			$index{page}{$src}{typedlinks} = $typedlinks{$page};
+		}
+
 		if (exists $pagestate{$page}) {
 			foreach my $id (@hookids) {
 				foreach my $key (keys %{$pagestate{$page}{$id}}) {
@@ -1926,12 +1938,17 @@ sub inject {
 	use warnings;
 }
 
-sub add_link ($$) {
+sub add_link ($$;$) {
 	my $page=shift;
 	my $link=shift;
+	my $type=shift;
 
 	push @{$links{$page}}, $link
 		unless grep { $_ eq $link } @{$links{$page}};
+
+	if (defined $type) {
+		$typedlinks{$page}{$type}{$link} = 1;
+	}
 }
 
 sub pagespec_translate ($) {
@@ -2212,6 +2229,11 @@ sub match_link ($$;@) {
 
 	$link=derel($link, $params{location});
 	my $from=exists $params{location} ? $params{location} : '';
+	my $linktype=$params{linktype};
+	my $qualifier='';
+	if (defined $linktype) {
+		$qualifier=" with type $linktype";
+	}
 
 	my $links = $IkiWiki::links{$page};
 	return IkiWiki::FailReason->new("$page has no links", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
@@ -2219,19 +2241,33 @@ sub match_link ($$;@) {
 	my $bestlink = IkiWiki::bestlink($from, $link);
 	foreach my $p (@{$links}) {
 		if (length $bestlink) {
-			return IkiWiki::SuccessReason->new("$page links to $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
-				if $bestlink eq IkiWiki::bestlink($page, $p);
+			if ((!defined $linktype || exists $IkiWiki::typedlinks{$page}{$linktype}{$p}) && $bestlink eq IkiWiki::bestlink($page, $p)) {
+				return IkiWiki::SuccessReason->new("$page links to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
+			}
 		}
 		else {
-			return IkiWiki::SuccessReason->new("$page links to page $p matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
-				if match_glob($p, $link, %params);
+			if ((!defined $linktype || exists $IkiWiki::typedlinks{$page}{$linktype}{$p}) && match_glob($p, $link, %params)) {
+				return IkiWiki::SuccessReason->new("$page links to page $p$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
+			}
 			my ($p_rel)=$p=~/^\/?(.*)/;
 			$link=~s/^\///;
-			return IkiWiki::SuccessReason->new("$page links to page $p_rel matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
-				if match_glob($p_rel, $link, %params);
+			if ((!defined $linktype || exists $IkiWiki::typedlinks{$page}{$linktype}{$p_rel}) && match_glob($p_rel, $link, %params)) {
+				return IkiWiki::SuccessReason->new("$page links to page $p_rel$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
+			}
 		}
 	}
-	return IkiWiki::FailReason->new("$page does not link to $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1);
+	return IkiWiki::FailReason->new("$page does not link to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1);
+}
+
+sub match_typedlink($$;@) {
+	my $page = shift;
+	my $args = shift;
+
+	if ($args =~ /^(\w+)\s+(.*)$/) {
+		return match_link($page, $2, @_, linktype => $1);
+	}
+
+	return IkiWiki::ErrorReason->new("typedlink expects e.g. 'tag *' but got: $args");
 }
 
 sub match_backlink ($$;@) {
diff --git a/IkiWiki/Plugin/tag.pm b/IkiWiki/Plugin/tag.pm
index cdcfaf536..af4bff1bc 100644
--- a/IkiWiki/Plugin/tag.pm
+++ b/IkiWiki/Plugin/tag.pm
@@ -6,8 +6,6 @@ use warnings;
 use strict;
 use IkiWiki 3.00;
 
-my %tags;
-
 sub import {
 	hook(type => "getopt", id => "tag", call => \&getopt);
 	hook(type => "getsetup", id => "tag", call => \&getsetup);
@@ -36,6 +34,13 @@ sub getsetup () {
 			safe => 1,
 			rebuild => 1,
 		},
+		tagged_is_strict => {
+			type => "boolean",
+			default => 0,
+			description => "if 1, tagged() doesn't match normal WikiLinks to tag pages",
+			safe => 1,
+			rebuild => 1,
+		},
 }
 
 sub tagpage ($) {
@@ -71,9 +76,8 @@ sub preprocess_tag (@) {
 
 	foreach my $tag (keys %params) {
 		$tag=linkpage($tag);
-		$tags{$page}{$tag}=1;
 		# hidden WikiLink
-		add_link($page, tagpage($tag));
+		add_link($page, tagpage($tag), 'tag');
 	}
 		
 	return "";
@@ -87,15 +91,13 @@ sub preprocess_taglink (@) {
 	return join(" ", map {
 		if (/(.*)\|(.*)/) {
 			my $tag=linkpage($2);
-			$tags{$params{page}}{$tag}=1;
-			add_link($params{page}, tagpage($tag));
+			add_link($params{page}, tagpage($tag), 'tag');
 			return taglink($params{page}, $params{destpage}, $tag,
 				linktext => pagetitle($1));
 		}
 		else {
 			my $tag=linkpage($_);
-			$tags{$params{page}}{$tag}=1;
-			add_link($params{page}, tagpage($tag));
+			add_link($params{page}, tagpage($tag), 'tag');
 			return taglink($params{page}, $params{destpage}, $tag);
 		}
 	}
@@ -110,17 +112,19 @@ sub pagetemplate (@) {
 	my $destpage=$params{destpage};
 	my $template=$params{template};
 
+	my $tags = $typedlinks{$page}{tag};
+
 	$template->param(tags => [
 		map { 
 			link => taglink($page, $destpage, $_, rel => "tag")
-		}, sort keys %{$tags{$page}}
-	]) if exists $tags{$page} && %{$tags{$page}} && $template->query(name => "tags");
+		}, sort keys %$tags
+	]) if defined $tags && %$tags && $template->query(name => "tags");
 
 	if ($template->query(name => "categories")) {
 		# It's an rss/atom template. Add any categories.
-		if (exists $tags{$page} && %{$tags{$page}}) {
+		if (defined $tags && %$tags) {
 			$template->param(categories => [map { category => $_ },
-				sort keys %{$tags{$page}}]);
+				sort keys %$tags]);
 		}
 	}
 }
@@ -130,7 +134,13 @@ package IkiWiki::PageSpec;
 sub match_tagged ($$;@) {
 	my $page = shift;
 	my $glob = shift;
-	return match_link($page, IkiWiki::Plugin::tag::tagpage($glob));
+
+	if ($IkiWiki::config{tagged_is_strict}) {
+		return match_link($page, IkiWiki::Plugin::tag::tagpage($glob), linktype => 'tag');
+	}
+	else {
+		return match_link($page, IkiWiki::Plugin::tag::tagpage($glob));
+	}
 }
 
 1
diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
index abafb0887..5810fc974 100644
--- a/IkiWiki/Render.pm
+++ b/IkiWiki/Render.pm
@@ -167,6 +167,7 @@ sub scan ($) {
 		else {
 			$links{$page}=[];
 		}
+		delete $typedlinks{$page};
 
 		run_hooks(scan => sub {
 			shift->(
@@ -398,6 +399,7 @@ sub find_del_files ($) {
 				push @del, $pagesources{$page};
 			}
 			$links{$page}=[];
+			delete $typedlinks{$page};
 			$renderedfiles{$page}=[];
 			$pagemtime{$page}=0;
 		}
@@ -499,6 +501,29 @@ sub remove_unrendered () {
 	}
 }
 
+sub link_types_changed ($$) {
+	# each is of the form { type => { link => 1 } }
+	my $new = shift;
+	my $old = shift;
+
+	return 0 if !defined $new && !defined $old;
+	return 1 if !defined $new || !defined $old;
+
+	while (my ($type, $links) = each %$new) {
+		foreach my $link (keys %$links) {
+			return 1 unless exists $old{$type}{$link};
+		}
+	}
+
+	while (my ($type, $links) = each %$old) {
+		foreach my $link (keys %$links) {
+			return 1 unless exists $new{$type}{$link};
+		}
+	}
+
+	return 0;
+}
+
 sub calculate_changed_links ($$$) {
 	my ($changed, $del, $oldlink_targets)=@_;
 
@@ -525,6 +550,14 @@ sub calculate_changed_links ($$$) {
 			}
 			$linkchangers{lc($page)}=1;
 		}
+
+		# we currently assume that changing the type of a link doesn't
+		# change backlinks
+		if (!exists $linkchangers{lc($page)}) {
+			if (link_types_changed($typedlinks{$page}, $oldlinktypes{$page})) {
+				$linkchangers{lc($page)}=1;
+			}
+		}
 	}
 
 	return \%backlinkchanged, \%linkchangers;
diff --git a/doc/bugs/tagged__40____41___matching_wikilinks.mdwn b/doc/bugs/tagged__40____41___matching_wikilinks.mdwn
index e7e4af7c3..9037d6c02 100644
--- a/doc/bugs/tagged__40____41___matching_wikilinks.mdwn
+++ b/doc/bugs/tagged__40____41___matching_wikilinks.mdwn
@@ -28,6 +28,9 @@ rationale on this, or what am I doing wrong, and how to achieve what I want?
 >> is valid. [[todo/matching_different_kinds_of_links]] is probably
 >> how it will eventually be solved. --[[Joey]] 
 
+>>> [[Done]]: you can now set the `tagged_is_strict` config option to `1`
+>>> if you don't want `tagged` to match other wikilinks. --[[smcv]]
+
 > And this is an illustration why a clean work-around (without changing the software) is not possible: while thinking about [[todo/matching_different_kinds_of_links]], I thought one could work around the problem by simply explicitly including the kind of the relation into the link target (like the tagbase in tags), and by having a separate page without the "tagbase" to link to when one wants simply to refer to the tag without tagging. But this won't work: one has to at least once refer to the real tag page if one wants to talk about it, and this reference will count as tagging (unwanted). --Ivan Z.
 
 > But well, perhaps there is a workaround without introducing different kinds of links. One could modify the [[tag plugin|plugins/tag]] so that it adds 2 links to a page: for tagging -- `tagbase/TAG`, and for navigation -- `tagdescription/TAG` (displayed at the bottom). Then the `tagdescription/TAG` page would hold whatever list one wishes (with `tagged(TAG)` in the pagespec), and whenever one wants to merely refer to the tag, one should link to `tagdescription/TAG`--this link won't count as tagging. So, `tagbase/TAG` would become completely auxiliary (internal) link targets for ikiwiki, the users would edit or link to only `tagdescription/TAG`. --Ivan Z.
diff --git a/doc/ikiwiki/pagespec.mdwn b/doc/ikiwiki/pagespec.mdwn
index 5c191f23f..ca6693024 100644
--- a/doc/ikiwiki/pagespec.mdwn
+++ b/doc/ikiwiki/pagespec.mdwn
@@ -52,6 +52,9 @@ Some more elaborate limits can be added to what matches using these functions:
   specified IP address.
 * "`postcomment(glob)`" - matches only when comments are being 
   posted to a page matching the specified glob
+* "`typedlink(type glob)`" - matches pages that link to a given page (or glob)
+  with a given link type. Plugins can create links with a specific type:
+  for instance, the tag plugin creates links of type `tag`.
 
 For example, to match all pages in a blog that link to the page about music
 and were written in 2005:
diff --git a/doc/plugins/tag.mdwn b/doc/plugins/tag.mdwn
index 8ff70a069..8cd79da41 100644
--- a/doc/plugins/tag.mdwn
+++ b/doc/plugins/tag.mdwn
@@ -8,6 +8,11 @@ These directives allow tagging pages.
 It also provides the `tagged()` [[ikiwiki/PageSpec]], which can be used to
 match pages that are tagged with a specific tag.
 
+If the `tagged_is_strict` config option is set, `tagged()` will only match
+tags explicitly set with [[ikiwiki/directive/tag]] or
+[[ikiwiki/directive/taglink]]; if not (the default), it will also match
+any other [[WikiLinks|ikiwiki/WikiLink]] to the tag page.
+
 [[!if test="enabled(tag)" then="""
 This wiki has the tag plugin enabled, so you'll see a note below that this
 page is tagged with the "tags" tag.
diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 96a2aa16d..fe7cf0183 100644
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -633,6 +633,22 @@ reference. Do not modify this hash directly; call `add_link()`.
 
 	$links{"foo"} = ["bar", "baz"];
 
+### `%typedlinks`
+
+The `%typedlinks` hash records links of specific types. Do not modify this
+hash directly; call `add_link()`. The keys are page names, and the values
+are hash references. In each page's hash reference, the keys are link types
+defined by plugins, and the values are hash references with link targets
+as keys, and 1 as a dummy value, something like this:
+
+	$typedlinks{"foo"} = {
+		tag => { short_word => 1, metasyntactic_variable => 1 },
+		next_page => { bar => 1 },
+	};
+
+Ordinary [[WikiLinks|ikiwiki/WikiLink]] appear in `%links`, but not in
+`%typedlinks`.
+
 ### `%pagesources`
 
 The `%pagesources` has can be used to look up the source filename
@@ -939,11 +955,14 @@ Optionally, a third parameter can be passed, to specify the preferred
 filename of the page. For example, `targetpage("foo", "rss", "feed")`
 will yield something like `foo/feed.rss`.
 
-### `add_link($$)`
+### `add_link($$;$)`
 
 This adds a link to `%links`, ensuring that duplicate links are not
 added. Pass it the page that contains the link, and the link text.
 
+An optional third parameter sets the link type (`undef` produces an ordinary
+[[ikiwiki/WikiLink]]).
+
 ## Miscellaneous
 
 ### Internal use pages
diff --git a/t/index.t b/t/index.t
index 2f23524a7..44273059d 100755
--- a/t/index.t
+++ b/t/index.t
@@ -4,7 +4,7 @@ use strict;
 use IkiWiki;
 
 package IkiWiki; # use internal variables
-use Test::More tests => 27;
+use Test::More tests => 31;
 
 $config{wikistatedir}="/tmp/ikiwiki-test.$$";
 system "rm -rf $config{wikistatedir}";
@@ -31,6 +31,7 @@ $renderedfiles{"bar"}=["bar.html", "bar.rss", "sparkline-foo.gif"];
 $renderedfiles{"bar.png"}=["bar.png"];
 $links{"Foo"}=["bar.png"];
 $links{"bar"}=["Foo", "new-page"];
+$typedlinks{"bar"}={tag => {"Foo" => 1}};
 $links{"bar.png"}=[];
 $depends{"Foo"}={};
 $depends{"bar"}={"foo*" => 1};
@@ -45,7 +46,7 @@ ok(-s "$config{wikistatedir}/indexdb", "index file created");
 
 # Clear state.
 %oldrenderedfiles=%pagectime=();
-%pagesources=%pagemtime=%oldlinks=%links=%depends=
+%pagesources=%pagemtime=%oldlinks=%links=%depends=%typedlinks=%oldtypedlinks=
 %destsources=%renderedfiles=%pagecase=%pagestate=();
 
 ok(loadindex(), "load index");
@@ -104,10 +105,16 @@ is_deeply(\%destsources, {
 	"sparkline-foo.gif" => "bar",
 	"bar.png" => "bar.png",
 }, "%destsources generated correctly");
+is_deeply(\%typedlinks, {
+	bar => {tag => {"Foo" => 1}},
+}, "%typedlinks loaded correctly");
+is_deeply(\%oldtypedlinks, {
+	bar => {tag => {"Foo" => 1}},
+}, "%oldtypedlinks loaded correctly");
 
 # Clear state.
 %oldrenderedfiles=%pagectime=();
-%pagesources=%pagemtime=%oldlinks=%links=%depends=
+%pagesources=%pagemtime=%oldlinks=%links=%depends=%typedlinks=%oldtypedlinks=
 %destsources=%renderedfiles=%pagecase=%pagestate=();
 
 # When state is loaded for a wiki rebuild, only ctime and oldrenderedfiles
@@ -140,5 +147,9 @@ is_deeply(\%pagecase, {
 }, "%pagecase generated correctly");
 is_deeply(\%destsources, {
 }, "%destsources generated correctly");
+is_deeply(\%typedlinks, {
+}, "%typedlinks cleared correctly");
+is_deeply(\%oldtypedlinks, {
+}, "%oldtypedlinks cleared correctly");
 
 system "rm -rf $config{wikistatedir}";
diff --git a/t/tag.t b/t/tag.t
new file mode 100755
index 000000000..3383fd475
--- /dev/null
+++ b/t/tag.t
@@ -0,0 +1,45 @@
+#!/usr/bin/perl
+package IkiWiki;
+
+use warnings;
+use strict;
+use Test::More tests => 10;
+
+BEGIN { use_ok("IkiWiki"); }
+BEGIN { use_ok("IkiWiki::Plugin::tag"); }
+
+ok(! system("rm -rf t/tmp; mkdir t/tmp"));
+
+$config{userdir} = "users";
+$config{tagbase} = "tags";
+$config{tagged_is_strict} = 1;
+
+%oldrenderedfiles=%pagectime=();
+%pagesources=%pagemtime=%oldlinks=%links=%depends=%typedlinks=%oldtypedlinks=
+%destsources=%renderedfiles=%pagecase=%pagestate=();
+
+foreach my $page (qw(tags/numbers tags/letters one two alpha beta)) {
+	$pagesources{$page} = "$page.mdwn";
+	$pagemtime{$page} = $pagectime{$page} = 1000000;
+}
+
+$links{one}=[qw(tags/numbers alpha tags/letters)];
+$links{two}=[qw(tags/numbers)];
+$links{alpha}=[qw(tags/letters one)];
+$links{beta}=[qw(tags/letters)];
+$typedlinks{one}={tag => {"tags/numbers" => 1 }};
+$typedlinks{two}={tag => {"tags/numbers" => 1 }};
+$typedlinks{alpha}={tag => {"tags/letters" => 1 }};
+$typedlinks{beta}={tag => {"tags/letters" => 1 }};
+
+ok(pagespec_match("one", "tagged(numbers)"));
+ok(!pagespec_match("two", "tagged(alpha)"));
+ok(pagespec_match("one", "link(tags/numbers)"));
+ok(pagespec_match("one", "link(alpha)"));
+
+ok(pagespec_match("one", "typedlink(tag tags/numbers)"));
+ok(!pagespec_match("one", "typedlink(tag tags/letters)"));
+# invalid syntax
+ok(pagespec_match("one", "typedlink(tag)")->isa("IkiWiki::ErrorReason"));
+
+1;