making a non-op middleware discoverable

[Laurent PETIT]

Hello,

`cider-nrepl` provides the `wrap-pprint` middleware.

`wrap-pprint` does not declare a new op, but rather enhances the `eval` op by pprinting the value of the `:eval` slot to the output stream.

Nevertheless, I'd like to be able, on the client-side of nrepl, to discover whether the `wrap-pprint` middleware is active or not.

At first, I tried to change its description so that it exposes a fake `pprint-middleware` op:

https://github.com/laurentpetit/cider-nrepl/commit/97f697df111a280e880739d33408e1ef3badf2d0

but this does not seem to work - or be sufficient, because then it seems I lose the pprint middleware feature.

If someone can please help me understand what I'm doing wrong

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Laurent Petit

[Chas Emerick]

Looking at your gist, you've moved the :requires and :expects metadata within the map for the dummy "pprint-middleware" map. Those should be peer keys of :handles.

IIRC, you're right that there's no easy way to identify whether particular middlewares are installed. The "describe" output is pretty strictly operation-related. That's probably worth a JIRA ticket.

- Chas

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[Laurent PETIT]

Hi Chas, thanks for your answer. I'll open a JIRA ticket. 

Cheers,

Laurent

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Laurent Petit

[Laurent PETIT]

Done: http://dev.clojure.org/jira/browse/NREPL-77

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Laurent Petit