This package provides a lispy interface to NIO.2 (requires Java 7)
The most important NIO.2 types used in this packages are Path and FileSystem
Add the following to your :dependencies:
[info.hoetzel/clj-nio2 "0.1.0"]
On the default filesystem:
user> (require '[nio2.io :as io2])
nil
user> (io2/path "project.clj")
#<UnixPath project.clj>On a different filesystem:
user> (io2/fs-path (io2/fs "jar:file:/home/juergen/zipfstest.zip" :create true) "project.clj")
#<ZipPath project.clj>nio2.io implements Coercions and IOFactory protocols.
user> (time (io/copy (io2/path "f:" "isos" "archlinux-2013.02.01-dual.iso") (io2/path "f:" "isos" "temp.iso")))
"Elapsed time: 897.233123 msecs"
#<WindowsPath f:\isos\temp.iso>
user> (time (io/copy (io/file "f:\\isos\\archlinux-2013.02.01-dual.iso") (io/file "f:\\isos\\temp.iso")))
"Elapsed time: 5324.70911 msecs"
nilPerformance using NIO2 is much faster than the old API (File has to be copied in Userspace).
Seq of Paths matching a glob:
user> (use 'nio2.dir-seq)
nil
user> (dir-seq-glob (path "") "*.clj")
(#<UnixPath project.clj>)Seq of Paths matching a predicate:
user> (use 'nio2.files) ; for path related predicate functions
nil
user> (dir-seq-filter (path "") (partial is-owner? "juergen"))
(#<UnixPath pom.xml.asc> #<UnixPath src> #<UnixPath .git> #<UnixPath README.md> #<UnixPath target> #<UnixPath project.clj> #<UnixPath pom.xml>)A Unix tail command implementation
(ns test.nio2.test.tail
(:use clojure.java.io nio2.io nio2.watch nio2.files))
(defn tail [n p]
"Print the last n lines of path p to stdout"
(with-open [rdr (reader p)]
(doseq [l (take-last n (line-seq rdr))]
(println l))
(doseq [e (watch-seq (parent (real-path p)) :modify)]
(when (= (real-path (:path e)) (real-path p))
(while (.ready rdr) (println (.readLine rdr)))))))The below code will watch any events in the \home\alex\tmp directory. On any changes it receives an event, which it then prints it on the screen.
The watch-seq fn takes a path object, and event types as input. It returns a lazy-seq of events.
The event types that can be given to it can be any or all of - :create, :modify and :delete.
(:use [nio2.watch :only [watch-seq]
[nio2.io :only [path]])
(doseq [ev (watch-seq (path "/" "home" "alex" "tmp") :create :modify :delete)]
(println [(ev :path) (ev :kind)]))
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