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[ikiwiki.git] / doc / plugins / aggregate.mdwn

diff --git a/doc/plugins/aggregate.mdwn b/doc/plugins/aggregate.mdwn
index e2efcd83f1d67dc17481f5cd2b2534329290a445..2925b6fba6633ab0ff19197e3df41197c0577e3f 100644 (file)
--- a/doc/plugins/aggregate.mdwn
+++ b/doc/plugins/aggregate.mdwn
@@ -1,13 +1,17 @@
 [[!template id=plugin name=aggregate author="[[Joey]]"]]
-[[!tag type/useful]]
+[[!tag type/special-purpose]]
 
 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