TIP RevCommentPlugin is not installed on Foswiki.org.


This plugin allows entry of a short summary of changes made to a topic for a new revision. This summary can be displayed e.g. in a history page of the topic or on the WebChanges page of a web. Changes may also be marked as "minor" by using the "Quiet save" button.

Since in Foswiki it is possible to make several changes within the edit lock time (normally 60 minutes) which are accumulated in only one new revision, it is also possible to have several comments for one revision.

Furthermore, adding or updating an attachment may also trigger an automatic comment for the current revision. This behaviour can be switched on or off with the help of the preference variable ATTACHMENT_COMMENTS (see below).

Syntax - Show previous comments

Write %REVCOMMENT{attributes}% anywhere in a topic.


Name Description Default
web web where topic exists current web
topic name of topic current topic
rev revision latest revision
separator delimiter between 2 comments for the same revision \n
header text before the first comment <ul>
format format string for each revision comment <li> $comment $minor
footer text after the last comment </ul>
minor text to print for a minor change (minor)

The text for the pre and post parameters will only be printed if the list of comments is not empty.

Entering new comments

If the skin setting is enabled, a text input field named comment will be added to the Edit screens. Enter your comment when you save your edits, and it will be saved in the topic.


%REVCOMMENT% shows the comments for the current revision.

if you have RevCommentPlugin enabled, you should see a comment here: %REVCOMMENT%


If you have also the HistoryPlugin installed, the history of a topic may look like this:




Note that this extension now ships with 4 templates, and requires a SKIN override to incorporate this extension. Set the SKIN in SitePreferences.
  • For a Foswiki 2.0 system, Set SKIN = revcomment,natedit,pattern
  • For a Foswiki 1.1 system, Set SKIN = revcom11,pattern

The comment input field and displayed comments are added via skin template overrides.

  • Either revcomment or revcom11 substituted for <skin>:
    Adds the revcomment parameter to the older Foswiki editor (Plain Text and TinyMCE.)
    Adds the revcomment parameter to the NatEdit editor.
    Incorporates the revision comments into the topic history displayed by HistoryPlugin.
    Adds the revision comments to the default search

If you are using other skins than the pattern, you will need to fit these template overrides into your site's skin. These templates add a textfield to the Editor interface:
<input class='foswikiInputField' type='text' style='width:50%' name='revcomment' id='revcomment' />


Most of the CSS used to display comments is already embedded in the PatternSkin styles.css and colors.css A small amount of CSS is also contained in-line in the oopshistory template.

Perl API

Third plugins may register a revision comment using the Foswiki::Plugins::RevCommentPlugin::setComment api. See the PerlDoc for more.

Installation Instructions

You do not need to install anything in the browser to use this extension. The following instructions are for the administrator who installs the extension on the server.

Open configure, and open the "Extensions" section. "Extensions Operation and Maintenance" Tab -> "Install, Update or Remove extensions" Tab. Click the "Search for Extensions" button. Enter part of the extension name or description and press search. Select the desired extension(s) and click install. If an extension is already installed, it will not show up in the search results.

You can also install from the shell by running the extension installer as the web server user: (Be sure to run as the webserver user, not as root!)
cd /path/to/foswiki
perl tools/extension_installer <NameOfExtension> install

If you have any problems, or if the extension isn't available in configure, then you can still install manually from the command-line. See https://foswiki.org/Support/ManuallyInstallingExtensions for more help.

  • Test if the installation was successful:
    • Add the SKIN setting to enable the template modifications.
    • Create a topic in your Sandbox web. Add a %REVCOMMENT% macro to the topic, and save it with a comment.
    • If you have also the HistoryPlugin installed, view the history of the topic you just created. It should contain the comment.

Change History

20 Oct 2020 (3.00) Michael Daum - rewrite: fix storage format while trying to be backwards compatible; removed plugin settings - these are all in configure now; improve tag handler; performance improvements by converting the plugin to an OO interface; added public api to set the revision comment by other plugins
01 Sep 2015 (2.01) Foswikitask:Item13657: Regex issues on perl 5.22
15 Aug 2015 (2.00) Foswikitask:Item11068: RevCommentPlugin conflicts with CommentPlugin
Foswikitask:Item13619: Add compatibility for Foswiki 2.0
Foswikitask:Item12880: Preserve rev-comment input across preview
11 Nov 2011 Item11249 - added registerMETA
22 Jan 2009: Kenneth Lavrsen - Added the two example images as attachments to the topic so they also get uploaded to foswiki.org. No need to upgrade from 08 Dec 2008 version if you already installed that.
08 Dec 2008: Kenneth Lavrsen - Changed the author to myself. JChristophFuchs is the original author but announced in 2006 that he no longer maintains this plugin. So now I officially take the task as maintainer. Plugin is changed to Foswiki namespace and tested and works under Foswiki 1.0.0. Policy is now feel free to modify but please do not break compatibility.
14 Apr 2006: <noautolink> added to default pre/post rendering output of REVCOMMENT tag
14 Apr 2006: Minor update for Dakar 4.0.2
22 Apr 2005: Initial version

PackageForm edit

Author Foswiki:Main.MichaelDaum, Foswiki:Main.KennethLavrsen, Foswiki:Main.SteffenPoulsen
Version 3.00
Release 20 Oct 2020
Description Allows a short summary of changes to be entered for a new revision
Copyright 2006, JChristophFuchs and Steffen Poulsen; 2008-2015 Kenneth Lavrsen; 2008-2020 Foswiki Contributors
License GPL (GNU General Public License)
Home http://foswiki.org/Extensions/RevCommentPlugin
Support http://foswiki.org/Support/RevCommentPlugin
Repository https://github.com/foswiki/RevCommentPlugin
ExtensionClassification Information structuring and Search
ExtensionType PluginPackage
Compatibility 2.0.0, 1.1.9
DemoUrl http://
SupportUrl RevCommentPlugin
ModificationPolicy PleaseFeelFreeToModify
I Attachment Action Size Date Who Comment
RevCommentPlugin.md5md5 RevCommentPlugin.md5 manage 171 bytes 20 Oct 2020 - 08:32 MichaelDaum  
RevCommentPlugin.sha1sha1 RevCommentPlugin.sha1 manage 195 bytes 20 Oct 2020 - 08:32 MichaelDaum  
RevCommentPlugin.tgztgz RevCommentPlugin.tgz manage 56 K 20 Oct 2020 - 08:32 MichaelDaum  
RevCommentPlugin.zipzip RevCommentPlugin.zip manage 63 K 20 Oct 2020 - 08:31 MichaelDaum  
RevCommentPlugin_installerEXT RevCommentPlugin_installer manage 5 K 20 Oct 2020 - 08:32 MichaelDaum  
Topic revision: r8 - 20 Oct 2020, MichaelDaum
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