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A better IDE integration story for Clojure
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src/redl Revert "Exit in the middle of a break; fix #11" Aug 2, 2014
test/redl Refactored completion into redl.complete namespace Dec 29, 2012
.gitignore Add start of readme for step-out Aug 2, 2014



A better Clojure IDE integration experience!

Redl has been integrated into Vim, in dgrnbrg/vim-foreplay:omnicomplete


Note: the namespaces are subject to refactoring, and will become separate in the future.


completions finds fuzzy completions of a form in a given namespace. It treats ., $, and / as separators, and requires an equal number and order of separators to appear in the match target. The first character in each non-separator region must be the first character in the match; however, the other characters can appear in any order.

Completions matches Clojure namespaces and aliases, namespace and alias-qualified vars, unqualified vars, imported Java classes, methods of imported Java classes, qualified Java classes, and static methods and fields of qualified and imported Java classes.

Metadata is also computed about the completions. Clojure functions and vars include docstrings and arglists. Java classes include the type signatures of their constructors. Java methods include all available type signatures.

The matches are scored and sorted, where the score is computed by looking at how many characters that were not specified occurred between each character in the pattern, penalizing one large filler group over several small ones, and prefering that the pattern characters appear towards the front of the match.

Examples of matches:

  • clj./mp matches clojure.core/map
  • ./join matches clojure.string/join
  • M/cos matches Math/cos
  • .st matches .start, since Thread is included by default.

More examples can be found in the tests.

Debug Repl

make-repl creates a repl and returns its id. repl-eval evaluates a form on an existing repl, and returns the stdout, stderr, return value, and other metadata about the evaluation.

Redl is a debug repl, which means that at any point you can call break, in which case you'll drop into a sub-repl. This sub-repl has the same local scope as the break had, and can be used to inspect and explode in the middle of a function evaluation. When you're ready to return, invoke continue. You can have break return its optional invoke if you invoke continue with no arguments, or you can have break return something else by invoking continue with an argument. You can also use step-out to move to a higher repl level, to exit loops and nested loops quickly. See the tests for more examples, or below for a sample session.

redl.core=> (+ 1 2)
redl.core=> (+ 1 (break 3))
Encountered break, waiting for input...
redl.core:debug-1=> (continue 8)
redl.core=> (let [x 1 y 2] (* x y (break 3)))
Encountered break, waiting for input...
redl.core:debug-1=> (println x y)
1 2
redl.core:debug-1=> (continue)

Including in a Leiningen project

Note: these will be easier when I get around to it.

You'll need to clone this repository, then run lein install to include it in your local maven cache. Next, you'll want to add the following keys to your .lein/profiles.clj:

  • :injections [(require '[redl core complete])] ensure that redl is loaded on jvm startup
  • :dependencies [[redl "0.2.0"]] ensures that redl is available on the classpath


Copyright © 2012 David Greenberg

Distributed under the Eclipse Public License, the same as Clojure.

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