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1.2.0

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with-io-streams

clojure.contrib.monadic-io-streams

(with-io-streams io-specs statement)

Open one or more streams as specified by io-spec, run a monadic
I/O statement on them, and close the streams. io-spec is
a binding-like vector in which each stream is specified by
three element: a keyword by which the stream can be referred to,
the stream mode (:read or :write), and a stream specification as
accepted by clojure.contrib.io/reader (mode :read) or
clojure.contrib.io/writer (mode :write). The statement
is run on a state which is a map from keywords to corresponding
streams. Single-stream monadic I/O statements must be wrapped
with clojure.contrib.monads/with-state-field.

0 Examples top

Source clojure/contrib/monadic_io_streams.clj:98 top

  (defn with-io-streams
    "Open one or more streams as specified by io-spec, run a monadic
     I/O statement on them, and close the streams. io-spec is
     a binding-like vector in which each stream is specified by
     three element: a keyword by which the stream can be referred to,
     the stream mode (:read or :write), and a stream specification as
     accepted by clojure.contrib.io/reader (mode :read) or
     clojure.contrib.io/writer (mode :write). The statement
     is run on a state which is a map from keywords to corresponding
     streams. Single-stream monadic I/O statements must be wrapped
     with clojure.contrib.monads/with-state-field."
    [io-specs statement]
    (letfn [(run-io [io-specs state statement]
	      (if (zero? (count io-specs))
		(first (statement state))
		(let [[[key mode stream-spec] & r] io-specs
		      opener (cond (= mode :read) reader
				   (= mode :write) writer
				   :else (throw
					  (Exception.
					   "Mode must be :read or :write")))]
		  (with-open [stream (opener stream-spec)]
		    (run-io r (assoc state key (lock stream)) statement)))))]
      (run-io (partition 3 io-specs) {} statement)))

Vars in clojure.contrib.monadic-io-streams/with-io-streams: defn letfn partition

Used in 0 other vars

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with-io-streams

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See Also top

Source clojure/contrib/monadic_io_streams.clj:98 top

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