Converting a heavily nested Clojure function to the threaded form

Question

I am trying to convert heavily nested expressions in Clojure. One example is the following:

(distinct (flatten (map keys (flatten (filter vector? (vals data))))))

The threaded form would be:

(->> data vals (filter vector?) flatten (map keys) flatten distinct)

Is it possible in Clojure to create a function or macro that help me automate getting the threaded form with the nested form as input? Or are there any third-party tools that I can use?

I can't think of any use case for such a macro; could you give an example? Or are you asking for a way to do this in your source code with an editor? — Sam Estep
– Sam Estep, Commented Apr 3, 2016 at 13:02
@Elogent Yes. I guess it's use case is the developer's own convenience in refactoring heavily nested code. — Ian CT
– Ian CT, Commented Apr 3, 2016 at 13:14
The only reason one would write a macro that converts from a nested form to a threaded form would be so that they could write the nested form in their source code and have Clojure convert it to the threaded form in the macroexpansion phase. Such a macro would be completely useless, because the threading macros just convert right back to the nested form. — Sam Estep
– Sam Estep, Commented Apr 3, 2016 at 13:24
True, since they are the same in terms of execution. However, it would be useful to know how to do it in terms of string manipulation. — Ian CT
– Ian CT, Commented Apr 3, 2016 at 13:40

Sam Estep · Accepted Answer · 2016-04-03 13:18:05Z

5

If you're using CIDER, I would recommend clj-refactor. It has refactoring capability for both -> and ->>, as well as a whole bunch of other stuff.

answered Apr 3, 2016 at 13:18

Sam Estep

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optevo Over a year ago

Lighttable also has a plugin which will do this: github.com/rundis/clj-light-refactor#threading

Cwt · Accepted Answer · 2023-04-04 12:38:35Z

0

Further tooling support:

IntelliJ - Cursive plugin: Since version 0.1.29 provides:

New Structural Editing commands: Kill Sexp, Thread/Unthread Form, Move Form Up/Down.

VS Code - Calva plugin: You would use the Thread Last All command to get the desired result. Full list of threading options are:

Command Title Command Key

Thread First clojureLsp.refactor.threadFirst

Thread First All clojureLsp.refactor.threadFirstAll

Thread Last clojureLsp.refactor.threadLast

Thread Last All clojureLsp.refactor.threadLastAll

answered Apr 4, 2023 at 12:38

Cwt

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Command Title	Command Key
Thread First	clojureLsp.refactor.threadFirst
Thread First All	clojureLsp.refactor.threadFirstAll
Thread Last	clojureLsp.refactor.threadLast
Thread Last All	clojureLsp.refactor.threadLastAll

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