Yes. I does not work. The "def" gets evaluated at compile-time, not run-time. The JAR file that the code is reading does not exist until after the program is compiled.
On Oct 22, 12:28 pm, James Reeves <jree...@weavejester.com> wrote: > Is there a reason why you can't (def version ...) directly, without > calling it via a set-version function? > > - James > > On 22 October 2010 16:56, 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. > > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to clojure@googlegroups.com > > Note that posts from new members are moderated - please be patient with > > your first post. > > To unsubscribe from this group, send email to > > clojure+unsubscr...@googlegroups.com > > For more options, visit this group at > >http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
