Advice on Shell Scripting with new "clojure" binary

[Delon Newman]

How do I get command line arguments in a Clojure shell script using the new "clojure" binary?

So for a file like:

# file-name: hello

#!/usr/bin/env clojure

(defn -main [name]

   (println (str "Hello, " name)))

and execute it like:

./hello John

the "-main" function is not executed. Is there another method?

Also, any additional advice with respect to using Clojure for shell scripting would be appreciated.

Thanks!

[Sean Corfield]

The `clojure` command just loads your script – it doesn’t call -main – if you had

 

      ;; test.clj

      (println “Loaded!”)

 

And you ran `clojure test.clj` then it would print Loaded!

 

So you could do:

 

      #!/usr/bin/env clojure

      (println (str “Hello, “ (first *command-line-args*)))

 

(the clojure.main/main function binds the command line arguments to that var)

 

This works on OS X – I haven’t tried it on Linux.

 

Sean Corfield -- (970) FOR-SEAN -- (904) 302-SEAN
An Architect's View -- http://corfield.org/

"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood

 

---

From: clo...@googlegroups.com <clo...@googlegroups.com> on behalf of Delon Newman <ikt...@gmail.com>
Sent: Thursday, January 4, 2018 3:26:43 PM
To: Clojure
Subject: Advice on Shell Scripting with new "clojure" binary

 

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[Delon Newman]

Thank you that's what I was looking for!

[Gary Verhaegen]

On 4 January 2018 at 23:26, Delon Newman <ikt...@gmail.com> wrote:
> Also, any additional advice with respect to using Clojure for shell
> scripting would be appreciated.

Unless you have a specific reason to prefer the JVM to Node as a
platform for your script, I'd encourage you to take a look at Planck
and Lumo for shell scripting. Being based on Node allows them to start
up much faster, which may or may not be important to your use-case.

http://planck-repl.org
https://github.com/anmonteiro/lumo

[Delon Newman]

Thanks, but I do need the JVM.

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[Alan Thompson]

Cool!  I had somehow missed that in the announcement.  Quick test on linux:

 > echo '(println "Yes!!!")' | time clojure

Clojure 1.9.0

user=> Yes!!!

nil

user=> 

clojure  1.38s user   0.07s system   198% cpu   0.730 total

Well under a second, even with a full-power JVM to load.  Very convenient!

Alan

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