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[[template id=plugin name=showdiff author="[[JeremieKoenig]]"]]
[[tag type/useful]]
This plugin, which can be downloaded
[here](http://www.jk.fr.eu.org/ikiwiki/showdiff.pm),
adds a "Show Diff" button to the page edition template.
When clicked, a diff between the stored page and provided content
is shown in the "Page Preview" area.
It depends on
[this patch](http://www.jk.fr.eu.org/ikiwiki/pluggable_editpage_buttons.diff),
which does the following:
* add a title to the editpage form;
* pass a reference to the list of buttons to the formbuilder_setup
hooks, so we can add ours;
* relax asumption about the possible submit values (use "Save Page"
explicitly);
* de-hardcode the submit buttons from the editpage template
(was this intended to work around something?).
> That was there to work around a bug in CGI::FormBuilder 3.0401
> that broke FORM-SUBMIT on customised templates. That seems to be
> fixed in the newer version ikiwiki already depends on. Patch accepted.
> --[[Joey]]
## Problems
No special handling is done of concurrent edits: changes introduced
independently will show up in the requested diff, although they will
be merged when the page is saved. I suspect even detecting this case
would require changes in the RCS backends.
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