add a "version" variable that the API can query from the REPL

[sritchie]

It would be lovely if Nextjournal and friends had some sicmutils-version variable inside env that they could query to figure out what is actually running! I'm not sure of the best pattern here. Does anyone have any pointers?

Clojure

Here is how to do it on the JVM, modeled after *clojure.core/clojure-version*:

(let [version-string (slurp (.getResourceAsStream
                             (clojure.lang.RT/baseLoader)
                             "SICMUTILS_VERSION"))
      [_ major minor incremental qualifier snapshot]
      (re-matches
       #"(\d+)\.(\d+)\.(\d+)(?:-([a-zA-Z0-9_]+))?(?:-(SNAPSHOT))?"
       version-string)
      version {:major       (Integer/valueOf ^String major)
               :minor       (Integer/valueOf ^String minor)
               :incremental (Integer/valueOf ^String incremental)
               :qualifier   (if (= qualifier "SNAPSHOT") nil qualifier)}]
  (def ^:dynamic *sicmutils-version*
    (if (.contains version-string "SNAPSHOT")
      (assoc version :interim true)
      version)))