Add system property babashka.version which contains current bb version

[borkdude]

A use case it for people to check a minimum babashka.version. Comparing strings isn't very ergonomic. Should we solve it a different way than with System properties? How can we still preserve compatibility with Clojure by not introducing non-custom vars?

[borkdude]

@jeroenvandijk Would this work well enough?

(require '[clojure.string :as str])

(def babashka-version (System/getProperty "babashka.version"))
;; e.g. 0.1.3-SNAPSHOT

(defn compare-version [v]
  (nat-int? (compare
             (mapv #(Integer. %)
                   (take 3 (str/split babashka-version  #"[\.\-]"))) v)))

(prn (compare-version [0 1 2])) ;; true
(prn (compare-version [0 1 3])) ;; true
(prn (compare-version [0 1 4])) ;; false

[borkdude]

add version system property

[jeroenvandijk]

@borkdude Yeah I think that's perfect for what I had in mind