Wrangler is an Erlang refactoring tool which provides a range of refactorings - including renaming, function extraction and generalisation - as well as facilities for clone detection and removal as well as improvement of the module structure of projects. Wrangler is integrated into emacs and Eclipse (via ErlIDE).
Up to now, you could only use the refactorings built into Wrangler, or dive deep into the internals to extend it. The latest version of Wrangler now provides a much easier way of defining and applying refactorings for yourself. All you need to do is implement them as a refactoring behaviour and they are accessible in emacs, and you can write descriptions of what the refactorings do using a combination of Erlang macros and templates that describe the particular changes to be made. You can also use the same facilities write new forms of code inspection equally easily.
After describing the DIY facilities and giving an overview demo of Wrangler we'll show how to use this DIY refactoring API in practice.
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