(.using
 [library
  [lux "*"
   [abstract
    [equivalence {"+" Equivalence}]]
   [data
    ["[0]" product]
    ["[0]" text
     ["%" format]]]]]
 ["[0]" /// {"+" Snapshot}
  ["[1][0]" time]
  ["[1][0]" stamp]])

(type: .public Value
  (Record
   [#version Text
    #snapshot Snapshot]))

(def: .public equivalence
  (Equivalence Value)
  ($_ product.equivalence
      text.equivalence
      ///.equivalence
      ))

(def: separator
  "-")

(def: .public snapshot
  "SNAPSHOT")

(def: .public (format (open "/[0]"))
  (%.Format Value)
  (case /#snapshot
    {///.#Local}
    /#version
    
    {///.#Remote stamp}
    (let [(open "/[0]") stamp]
      (%.format (text.replaced ..snapshot
                               (///time.format /#time)
                               /#version)
                ..separator
                (%.nat /#build)))))