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README [skip ci]

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Michiel Borkent 2020-08-19 17:12:14 +02:00
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README.md
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@ -603,9 +603,11 @@ Babashka can create uberjars from a given classpath and optionally a main
method: method:
``` shell ``` shell
$ bb -cp $(clojure -Spath) -m my-gist-script --uberjar my-project.jar $ cat src/foo.clj
$ bb my-project.jar (ns foo (:gen-class)) (defn -main [& args] (prn :hello))
Hello from gist script! $ bb -cp $(clojure -Spath):classes -m foo --uberjar foo.jar
$ bb foo.jar
:hello
``` ```
When producing a classpath using the `clojure` or `deps.clj` tool, Clojure When producing a classpath using the `clojure` or `deps.clj` tool, Clojure
@ -613,32 +615,42 @@ itself, spec and the core specs will be on the classpath and will therefore be
included in your uberjar, which makes it bigger than necessary: included in your uberjar, which makes it bigger than necessary:
``` shell ``` shell
$ ls -lh my-project.jar $ ls -lh foo.jar
-rw-r--r-- 1 borkdude staff 4.5M Aug 19 14:45 my-project.jar -rw-r--r-- 1 borkdude staff 4.5M Aug 19 17:04 foo.jar
``` ```
To exclude these dependencies, you can use the following `:classpath-overrides` To exclude these dependencies, you can use the following `:classpath-overrides`
in your `deps.edn`: in your `deps.edn`:
``` clojure ``` clojure
{:deps {:aliases {:remove-clojure {:classpath-overrides {org.clojure/clojure nil
{my_gist_script
{:git/url "https://gist.github.com/borkdude/263b150607f3ce03630e114611a4ef42"
:sha "cfc761d06dfb30bb77166b45d439fe8fe54a31b8"}}
:aliases {:my-script {:main-opts ["-m" "my-gist-script"]}
:remove-clojure {:classpath-overrides {org.clojure/clojure nil
org.clojure/spec.alpha nil org.clojure/spec.alpha nil
org.clojure/core.specs.alpha nil}}}} org.clojure/core.specs.alpha nil}}}}
``` ```
``` shell ``` shell
$ bb -cp $(clojure -A:remove-clojure -Spath) -m my-gist-script --uberjar my-bb-project.jar $ rm foo.jar
$ bb my-project.jar $ bb -cp $(clojure -A:remove-clojure -Spath) -m foo --uberjar foo.jar
Hello from gist script! $ bb foo.jar
$ ls -lat *.jar :hello
-rw-r--r-- 1 borkdude staff 4682045 Aug 19 14:55 my-project.jar $ ls -lh foo.jar
-rw-r--r-- 1 borkdude staff 7880 Aug 19 14:55 my-bb-project.jar -rw-r--r-- 1 borkdude staff 871B Aug 19 17:07 foo.jar
```
If you want your uberjar to be compatible with the JVM, you'll need to compile
the main namespace. Babashka does not do compilation, so we use Clojure on the
JVM for that part:
``` shell
$ rm foo.jar
$ mkdir classes
$ clojure -e "(require 'foo) (compile 'foo)"
foo
$ bb -cp $(clojure -Spath):classes -m foo --uberjar foo.jar
$ bb foo.jar
:hello
$ java -jar foo.jar
:hello
``` ```
## System properties ## System properties