- Why not make the jar available at compile time as well? (e.g. maven scope="provided")
- You could also use a delay: (def *version* (delay (get-version))) and then write @*version* when you want the version information at runtime. - Equivalently, you could memoize get-version and just call that at runtime whenever you want the version. (def get-version (memoize (fn [] (-> (str "jar:" ... ))))) // Ben On Sat, Oct 23, 2010 at 14:53, Ralph <grkunt...@gmail.com> wrote: > Won't work. The "def" gets executed at compile time, before the JAR > file exists. > > On Oct 22, 3:55 pm, ataggart <alex.tagg...@gmail.com> wrote: >> (defn get-version [] >> (-> (str "jar:" (-> my.ns.name (.getProtectionDomain) >> (.getCodeSource) >> (.getLocation)) >> "!/META-INF/MANIFEST.MF") >> (URL.) >> (.openStream) >> (Manifest.) >> (.. getMainAttributes) >> (.getValue "Build-number"))) >> >> (def *version* (get-version)) >> >> 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. > > -- > 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
