Some recent discussions with @thheller and others prompted me to investigate if Boot could
be used as a library with a separate tool to construct the initial classpath, say clj.
In my hypothetical thinking one should be able to do something like this:
(ns org.acme.deploy
(:require [boot.core :as b]
[boot.tasks.built-in :as tasks]))
(defn -main []
(boot (pom ,,,)
(jar)
(push ,,,)))
And then run it using clj (provided one has boot dependencies in their deps.edn):
clj -m org.acme.deploy
I think it would be cool if this were possible!
The remaining part of this post is about some early exploration I did and might not be as interesting to everybody.
Known Problems
The above is all a bit further out but one thing I’ve tried already is this:
java -cp "$(clj -Spath)" boot.App repl
It gives you a REPL that can run basic Clojure stuff, e.g.
(def a 1)(+ a 2)(boot (with-pass-thru _ (println "test")))(require 'boot.pod)-
(count boot.pod/pods)(yields ‘2’ after repl start)
but fails with the slightly more complex (pod-using?) things I’ve tried:
- creating pods:
(boot.pod/make-pod {:dependencies [['bidi "2.1.3"]]}) - running tasks:
(boot (pom :project 'a/b :version "1.2.3") (target))
Most of these fail with some “Pop without matching push” exceptions (see below).
I assume those can somehow be traced back to the fact that there is — in contrast to when boot is used — no Boot.class or boot.ParentClassLoader.class on the classpath. (Those are provided by the boot binary.)
clojure.lang.ExceptionInfo: Pop without matching push {:line 13}
at clojure.core$ex_info.invokeStatic(core.clj:4739)
at clojure.core$ex_info.invoke(core.clj:4739)
at boot.main$_main$fn__1201.invoke(main.clj:222)
at boot.main$_main.invoke(main.clj:216)
at clojure.lang.Var.invoke(Var.java:396)
at org.projectodd.shimdandy.impl.ClojureRuntimeShimImpl.invoke(ClojureRuntimeShimImpl.java:159)
at org.projectodd.shimdandy.impl.ClojureRuntimeShimImpl.invoke(ClojureRuntimeShimImpl.java:150)
at boot.App.runBoot(App.java:399)
at boot.App.main(App.java:491)
Caused by: java.lang.IllegalStateException: Pop without matching push
at clojure.lang.Var.popThreadBindings(Var.java:333)
at clojure.core$pop_thread_bindings.invokeStatic(core.clj:1923)
at clojure.core$pop_thread_bindings.invoke(core.clj:1923)
at boot.core$run_tasks.invoke(core.clj:1019)
at boot.core$boot$fn__933.invoke(core.clj:1031)
at clojure.core$binding_conveyor_fn$fn__5476.invoke(core.clj:2022)
at clojure.lang.AFn.call(AFn.java:18)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Boot failed to start:
java.lang.IllegalStateException: Pop without matching push
at clojure.lang.Var.popThreadBindings(Var.java:333)
at clojure.core$pop_thread_bindings.invokeStatic(core.clj:1923)
at clojure.core$pop_thread_bindings.invoke(core.clj:1923)
at boot.main$_main.invoke(main.clj:174)
at clojure.lang.Var.invoke(Var.java:396)
at org.projectodd.shimdandy.impl.ClojureRuntimeShimImpl.invoke(ClojureRuntimeShimImpl.java:159)
at org.projectodd.shimdandy.impl.ClojureRuntimeShimImpl.invoke(ClojureRuntimeShimImpl.java:150)
at boot.App.runBoot(App.java:399)
at boot.App.main(App.java:491)
