aggregate: Write timestamp next aggregation can happen to .ikiwiki/aggregatetime...

diff --git a/IkiWiki/Plugin/aggregate.pm b/IkiWiki/Plugin/aggregate.pm
index 5a9eb433de8311e0a9d77909aa45343c609bdea5..7789c4c2a9d38b7e616d9d3b4df8e4d96fe74ec6 100644 (file)
--- a/IkiWiki/Plugin/aggregate.pm
+++ b/IkiWiki/Plugin/aggregate.pm
@@ -298,7 +298,7 @@ sub loadstate () {
        return if $state_loaded;
        $state_loaded=1;
        if (-e "$config{wikistatedir}/aggregate") {
-               open(IN, "$config{wikistatedir}/aggregate") ||
+               open(IN, "<", "$config{wikistatedir}/aggregate") ||
                        die "$config{wikistatedir}/aggregate: $!";
                while (<IN>) {
                        $_=IkiWiki::possibly_foolish_untaint($_);
@@ -335,7 +335,7 @@ sub savestate () {
        garbage_collect();
        my $newfile="$config{wikistatedir}/aggregate.new";
        my $cleanup = sub { unlink($newfile) };
-       open (OUT, ">$newfile") || error("open $newfile: $!", $cleanup);
+       open (OUT, ">", $newfile) || error("open $newfile: $!", $cleanup);
        foreach my $data (values %feeds, values %guids) {
                my @line;
                foreach my $field (keys %$data) {
@@ -356,6 +356,20 @@ sub savestate () {
        close OUT || error("save $newfile: $!", $cleanup);
        rename($newfile, "$config{wikistatedir}/aggregate") ||
                error("rename $newfile: $!", $cleanup);
+
+       my $timestamp=undef;
+       foreach my $feed (keys %feeds) {
+               my $t=$feeds{$feed}->{lastupdate}+$feeds{$feed}->{updateinterval};
+               if (! defined $timestamp || $timestamp > $t) {
+                       $timestamp=$t;
+               }
+       }
+       $newfile=~s/\.new$/time/;
+       open (OUT, ">", $newfile) || error("open $newfile: $!", $cleanup);
+       if (defined $timestamp) {
+               print OUT $timestamp."\n";
+       }
+       close OUT || error("save $newfile: $!", $cleanup);
 }
 
 sub garbage_collect () {

diff --git a/debian/changelog b/debian/changelog
index 18db7c0c26178751ebcf1aa92bb231ce8e259bec..9d88b5c9c73a318d49038b8f6be5c108ea4c9921 100644 (file)
--- a/debian/changelog
+++ b/debian/changelog
@@ -3,6 +3,8 @@ ikiwiki (3.20100705) UNRELEASED; urgency=low
   * img: Add a margin around images displayed by this directive.
   * comments: Added commentmoderation directive for easy linking to the
     comment moderation queue.
+  * aggregate: Write timestamp next aggregation can happen to
+    .ikiwiki/aggregatetime, to allow for more sophisticated cron jobs.
 
  -- Joey Hess <joeyh@debian.org>  Mon, 05 Jul 2010 13:59:42 -0400
 

diff --git a/doc/plugins/aggregate.mdwn b/doc/plugins/aggregate.mdwn
index bb828b05ca6a660ba9abe260d6c91f6feb0c07e6..2925b6fba6633ab0ff19197e3df41197c0577e3f 100644 (file)
--- a/doc/plugins/aggregate.mdwn
+++ b/doc/plugins/aggregate.mdwn
@@ -5,9 +5,13 @@ This plugin allows content from other feeds to be aggregated into the
 wiki. To specify feeds to aggregate, use the
 [[ikiwiki/directive/aggregate]] [[ikiwiki/directive]].
 
-The [[meta]] and [[tag]] plugins are also recommended. Either the
-[[htmltidy]] or [[htmlbalance]] plugin is suggested, since feeds can easily
-contain html problems, some of which these plugins can fix.
+## requirements
+
+The [[meta]] and [[tag]] plugins are also recommended to be used with this
+one. Either the [[htmltidy]] or [[htmlbalance]] plugin is suggested, since
+feeds can easily contain html problems, some of which these plugins can fix.
+
+## triggering aggregation
 
 You will need to run ikiwiki periodically from a cron job, passing it the
 --aggregate parameter, to make it check for new posts. Here's an example
@@ -15,6 +19,11 @@ crontab entry:
 
        */15 * * * * ikiwiki --setup my.wiki --aggregate --refresh
 
+The plugin updates a file `.ikiwiki/aggregatetime` with the unix time stamp
+when the next aggregation run could occur. (The file may be empty, if no
+aggregation is required.) This can be integrated into more complex cron
+jobs or systems to trigger aggregation only when needed.
+
 Alternatively, you can allow `ikiwiki.cgi` to trigger the aggregation. You
 should only need this if for some reason you cannot use cron, and instead
 want to use a service such as [WebCron](http://webcron.org). To enable