I have a Clojure program that I build as a JAR file using Maven.
Embedded in the JAR Manifest is a build-version number, including the
build timestamp.
I can easily read this at runtime from the JAR Manifest using the
following code:
(defn set-version
"Set the version variable to the build number."
[]
(def version
(-> (str "jar:" (-> my.ns.name (.getProtectionDomain)
(.getCodeSource)
(.getLocation))
"!/META-INF/MANIFEST.MF")
(URL.)
(.openStream)
(Manifest.)
(.. getMainAttributes)
(.getValue "Build-number"))))
but I've been told that it is bad karma to use def inside defn.
What is the Clojure-idiomatic way to set a constant at runtime? I
obviously do not have the build-version information to embed in my
code as a def, but I would like it set once (and for all) from the
main function when the program starts. It should then be available as
a def to the rest of the running code.
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