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How to run .clj file as a script using leningen?

This is the second question after Is there a standalone Clojure package within Leiningen?

For example, I have a file hello_world.clj, and I can run it using

java -cp clojure.jar clojure.main hello_world.clj.

Since lein already contains Clojure (because I can run lein repl directly), is there a way to do the same thing like

lein script hello_world.clj by lein?

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Hanfei Sun Avatar asked Aug 21 '12 23:08

Hanfei Sun


3 Answers

There are several ways with lein repl:

  • Very slow: cat your_file.clj | lein repl
  • Slow: echo '(load-file "your_file.clj")' | lein repl
  • Fast:
    1. lein repl
    2. (load-file "your_file.clj")
    3. repeat 2
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Ming Avatar answered Nov 06 '22 22:11

Ming


use lein-exec plugin, example from readme.md (updated with "lein" instead of "lein2")

cat foo.clj | lein exec
lein exec -e '(println "foo" (+ 20 30))'
lein exec -ep "(use 'foo.bar) (pprint (map baz (range 200)))"
lein exec -p script/run-server.clj -p 8088
lein exec ~/common/delete-logs.clj
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number23_cn Avatar answered Nov 06 '22 23:11

number23_cn


leiningen can create an 'uberjar' for you with all your dependencies....

lein uberjar

will create a jar for you in the target subdirectory. The jar will contain all the dependencies listed in your project.clj, so you don't need to worry about constructing a complex classpath to invoke your code.

You can reference this uberjar as a single entry in your java classpath in the normal way or, specify a main-class in the project.clj invoke it as an executable jar.

e.g. a project.clj like this:

(defproject clj-scratch "1.0.0-SNAPSHOT"
 :description "FIXME: write description"
 :dependencies [[org.clojure/clojure "1.4.0"]                     
 :main clj-scratch.core)

will invoke the -main function in clj-scratch.core namespace

if you run:

java -jar target/clj-scratch-1.0.0-SNAPSHOT-standalone.jar
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sw1nn Avatar answered Nov 06 '22 22:11

sw1nn