Here's one way:
(def version (delay (... read the JAR ...))
(defn get-version [] (force version))
-S
On Oct 22, 11:56 am, Ralph <grkunt...@gmail.com> wrote:
> 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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