This is literally the way we "think"...but if we all verbalized it this
way... we would all have a stack overflow at runtime.



On Fri, Oct 22, 2010 at 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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