On Fri, Mar 4, 2011 at 1:41 PM, Stuart Sierra
<[email protected]> wrote:
> There are difficulties with using Clojure -- or any JVM language -- for
> system administration. The first and biggest is the JVM startup time,
> making it impractical for command-line use without a separate "server"
> process.
Or you could just hoist the entire shell up into the JVM ...
Let's see ...
(def wd (atom (java.io.File. "/")))
(defn pwd [] @wd)
(defn file [thing]
(if (instance? java.io.File thing) thing (File. (pwd) thing)))
(defn cwd [f]
(let [f (file f)]
(if (.isDirectory f)
(reset! wd f)
(throw (IllegalArgumentException. (str "No such directory: " f))))))
(defn ls [& opts]
...
:)
> Many common OS-level features -- launching processes and
> sending signals, for example -- are not available in the standard Java APIs,
> and require the use of native code or implementation-specific APIs.
Er, (.exec (Runtime/getRuntime) "foo") anyone? And that includes
(.exec (Runtime/getRuntime)
(str "kill -s SIGALRM " get-some-pid))
of course. :)
> I'm not saying it can't be done, just that there may be better tools for the
> job.
After a little macro wizardry, that might actually turn out not to be
true. I certainly wouldn't categorically rule it out. :)
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