Add very preliminary patch

diff --git a/doc/todo/tracking_bugs_with_dependencies.mdwn b/doc/todo/tracking_bugs_with_dependencies.mdwn
index bdc0857856139991e1d95c2e7b9d3b490bd22e8b..357cc33a89cce2952c95b83e517da0382da76263 100644 (file)
--- a/doc/todo/tracking_bugs_with_dependencies.mdwn
+++ b/doc/todo/tracking_bugs_with_dependencies.mdwn
@@ -43,3 +43,174 @@ I like the idea of [[tips/integrated_issue_tracking_with_ikiwiki]], and I do so
 > Without having different types of links, I don't see how this would be possible.
 >
 > -- [[Will]]
+
+Okie - I've had a quick attempt at this.  Initial patch attached.  This one doesn't quite work.
+And there is still a lot of debugging stuff in there.
+
+At the moment I've added a new preprocessor plugin, `definepagespec`, which is like
+shortcut for pagespecs.  To reference a named pagespec, use `~` like this:
+
+    [ [!definepagespec name="bugs" spec="bugs/* and !*/Discussion"]]
+    [ [!definepagespec name="openbugs" spec="~bugs and !link(done)"]]
+    [ [!definepagespec name="readybugs" spec="~openbugs and !link(~openbugs)"]]
+
+At the moment the problem is in `match_link()` when we're trying to find a sub-page that
+matches the appropriate page spec.  There is no good list of pages available to iterate over.
+
+    foreach my $nextpage (keys %IkiWiki::pagesources)
+
+does not give me a good list of pages.  I found the same thing when I was working on
+this todo [[todo/Add_a_plugin_to_list_available_pre-processor_commands]].
+
+Immediately below is a patch for IkiWiki.pm.  Below that is a new plugin `definepagespec `
+which behaves like `shortcut` for pagespecs.
+
+----
+
+diff --git a/IkiWiki.pm b/IkiWiki.pm
+index e476521..1d2d48c 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 %renderedfiles %oldrenderedfiles %pagesources
+           %destsources %depends %hooks %forcerebuild $gettext_obj
+-          %loaded_plugins};
++          %loaded_plugins %named_pagespec};
+ 
+ use Exporter q{import};
+ our @EXPORT = qw(hook debug error template htmlpage add_depends pagespec_match
+@@ -22,7 +22,7 @@ our @EXPORT = qw(hook debug error template htmlpage add_depends pagespec_match
+                  displaytime will_render gettext urlto targetpage
+                add_underlay
+                  %config %links %pagestate %renderedfiles
+-                 %pagesources %destsources);
++                 %pagesources %destsources %named_pagespec);
+ our $VERSION = 2.00; # plugin interface version, next is ikiwiki version
+ our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE
+ my $installdir=''; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
+@@ -1271,7 +1271,7 @@ sub loadindex () { #{{{
+       %oldrenderedfiles=%pagectime=();
+       if (! $config{rebuild}) {
+               %pagesources=%pagemtime=%oldlinks=%links=%depends=
+-              %destsources=%renderedfiles=%pagecase=%pagestate=();
++              %destsources=%renderedfiles=%pagecase=%pagestate=%named_pagespec=();
+       }
+       my $in;
+       if (! open ($in, "<", "$config{wikistatedir}/indexdb")) {
+@@ -1729,6 +1729,8 @@ sub match_glob ($$;@) { #{{{
+       
+       my $from=exists $params{location} ? $params{location} : '';
+       
++      print "Matching glob $glob \n";
++      
+       # relative matching
+       if ($glob =~ m!^\./!) {
+               $from=~s#/?[^/]+$##;
+@@ -1736,6 +1738,18 @@ sub match_glob ($$;@) { #{{{
+               $glob="$from/$glob" if length $from;
+       }
+ 
++      if (substr($glob, 0, 1) eq '~') {
++              my $specname = substr($glob, 1);
++              print "Checking for pagespec named $specname \n";
++              if (exists $IkiWiki::named_pagespec{$specname}) {
++                      my $spec = $IkiWiki::named_pagespec{$specname};
++                      return IkiWiki::pagespec_match($page, $spec, %params);
++              } else {
++                      print "Couldn't find pagespec\n";
++                      return IkiWiki::FailReason->new("Page spec $specname referenced on page $page does not exist");
++              }
++      }
++
+       my $regexp=IkiWiki::glob2re($glob);
+       if ($page=~/^$regexp$/i) {
+               if (! IkiWiki::isinternal($page) || $params{internal}) {
+@@ -1756,11 +1770,36 @@ sub match_internal ($$;@) { #{{{
+ 
+ sub match_link ($$;@) { #{{{
+       my $page=shift;
+-      my $link=lc(shift);
++      my $fulllink=shift;
++      my $link=lc($fulllink);
+       my %params=@_;
+ 
++      print "Matching link $fulllink \n";
++      
+       my $from=exists $params{location} ? $params{location} : '';
+ 
++      if (substr($fulllink, 0, 1) eq '~') {
++              my $specname = substr($fulllink, 1);
++              print "Checking link pagespec $specname \n";
++              if (exists $IkiWiki::named_pagespec{$specname}) {
++                      my $spec = $IkiWiki::named_pagespec{$specname};
++                      
++                      print "Checking all pages against $spec\n";
++                      
++                      foreach my $nextpage (keys %IkiWiki::pagesources) {
++                              print "Checking $nextpage against $spec\n";
++                              if (pagespec_match($nextpage, $spec, %params) && IkiWiki::PageSpec::match_link($page, $nextpage, %params)) {
++                                      return IkiWiki::SuccessReason->new("$page links to page $nextpage matching $link")
++                              }
++                      }
++                      
++                      return IkiWiki::FailReason->new("$page has no links to any pages that match $spec");
++              } else {
++                      print "Pagespec $specname not found\n";
++                      return IkiWiki::FailReason->new("$page cannot link to nonexistent spec name $specname");
++              }
++      }
++
+       # relative matching
+       if ($link =~ m!^\.! && defined $from) {
+               $from=~s#/?[^/]+$##;
+
+----
+
+#!/usr/bin/perl
+package IkiWiki::Plugin::definepagespec;
+
+use warnings;
+use strict;
+use IkiWiki 2.00;
+
+sub import { #{{{
+       hook(type => "getsetup", id => "definepagespec", call => \&getsetup);
+       hook(type => "refresh", id => "definepagespec", call => \&refresh);
+       hook(type => "preprocess", id => "definepagespec", call => \&preprocess);
+} #}}}
+
+sub getsetup () { #{{{
+       return
+               plugin => {
+                       safe => 1,
+                       rebuild => undef,
+               },
+} #}}}
+
+sub refresh () { #{{{
+       # Preprocess the shortcuts page to get all the available shortcuts
+       # defined before other pages are rendered.
+       my $srcfile=srcfile("pagespecs.mdwn", 1);
+       if (! defined $srcfile) {
+               error(gettext("definepagespec plugin will not work without a pagespecs.mdwn"));
+       }
+       IkiWiki::preprocess("pagespecs", "pagespecs", readfile($srcfile));
+} # }}}
+
+sub preprocess (@) { #{{{
+       my %params=@_;
+
+       if (! defined $params{name} || ! defined $params{spec}) {
+               error gettext("missing name or spec parameter");
+       }
+
+       $IkiWiki::named_pagespec{$params{name}} = $params{spec};
+
+       #translators: This is used to display what shortcuts are defined.
+       #translators: First parameter is the name of the shortcut, the second
+       #translators: is an URL.
+       return sprintf(gettext("pagespec %s refers to <i>%s</i>"), $params{name}, $params{spec});
+} # }}}
+
+1