ataggart

; Released under the Apache License, Version 2.0
; http://www.apache.org/licenses/LICENSE-2.0.html

(defmacro try-let
  "A combination of try and let such that exceptions thrown in the binding or
   body can be handled by catch clauses in the body, and all bindings are
   available to the catch and finally clauses. If an exception is thrown while
   evaluating a binding value, it and all subsequent binding values will be nil.

   Example:

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(defn take-until
  "Returns a lazy sequence of successive items from coll until
   (pred item) returns true, including that item. pred must be
   free of side-effects. 
   E.g., (take-until zero? [1 2 0 3]) => (1 2 0)"
  [pred coll]
  (lazy-seq
    (when-let [s (seq coll)]
      (if (pred (first s))
        (cons (first s) nil)

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(defn arities
  "Returns a vector of the arities of function f, or of the dispatch
   function if f is a multifn.

   Example:
   => (arities (fn ([]) ([x]) ([x y & z])))
   [0 1 2 :more]"
  [f]
  (let [f            (if (instance? clojure.lang.MultiFn f) (.dispatchFn f) f)
        methods      (.getDeclaredMethods (class f))

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(defn left-join
  "When passed 2 rels, returns the rel corresponding to the natural
  left-join. When passed an additional keymap, joins on the corresponding
  keys."
  ([xrel yrel]
   (if (and (seq xrel) (seq yrel))
     (let [ks (intersection (set (keys (first xrel)))
                            (set (keys (first yrel))))
           idx (index yrel ks)]
       (reduce (fn [ret x]

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(defproject example "0.1.0"
  :description "Example configuration for using log4j2 as the concrete logging
                implementation. Libraries that depend on other well-known java
                logging abstractions (e.g., SLF4J) will be logged with log4j2.
                Also configures tools.logging to choose log4j2."

  :dependencies [; Provide the log4j2 logging implementation:
                 [org.apache.logging.log4j/log4j-api "2.13.0"]
                 [org.apache.logging.log4j/log4j-core "2.13.0"]
                 ; Provide log4j2 adapters for other java logging abstractions: