# Package =TWiki::UI::RDiff UI functions for diffing.
## [[StaticMethod]] **diff** `($session,$web,$topic,$query)` `diff` command handler. This method is designed to be invoked via the `UI::run` method. Renders the differences between version of a [[TwikiTopic]]
topic topic that we are showing the differences of
rev1 the higher revision
rev2 the lower revision
render the rendering style {sequential, sidebyside, raw, debug} (preferences) DIFFRENDERSTYLE, sequential
type {history, diff, last} history diff, version to version, last version to previous history
context number of lines of context
skin the skin(s) to use to display the diff
TODO: - add a \{word\} render style - move the common CGI param handling to one place - move defaults somewhere