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Hydras for CIDER

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[Hydras](https://github.com/abo-abo/hydra) for [CIDER](https://github.com/clojure-emacs/cider).

## Overview

This package defines some hydras (pop-up menus of commands with common
prefixes) for CIDER.

Hydras serve several important purposes: discovery, memorization, and
organization.

- Discovery

- Grouping related commands together under a common prefix and
    displaying them in a single menu facilitates discovery.

- For example, if a user wants to know about CIDER's documentation
    commands, they could bring up a hydra that includes commands like
    `cider-doc', `cider-javadoc', etc, some of which may be new to them.

- Memorization

- Hydras serve as a memory aid for the user.  By grouping related
    commands together, the user has less need to memorize every command;
    knowing one, she can find the others.

- Organization

- The process of creating hydras can aid in organizing code.  This
    gives both developers and users a better overview of what the
    project can or cannot do.

- Thus, each hydra is like a section of a quick-reference card.  In
    fact, many of the hydras here are inspired by the CIDER refcard:
    https://github.com/clojure-emacs/cider/blob/master/doc/cider-refcard.pdf

## Install

After setting up [MELPA](http://melpa.org/) as a repository, use `M-x package-install cider-hydra` to install the package.

## Setup

Add the following to your init file:

```emacs-lisp
(add-hook 'clojure-mode-hook #'cider-hydra-mode)
```

To turn hydras off, just disable the `cider-hydra-mode`, which will restore the previous CIDER commands.

## See Also

- The [which-key](https://github.com/justbur/emacs-which-key) package, which
  displays keys following for a prefix key.

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