(.module:
  [library
   [lux #*
    [abstract
     [equivalence (#+ Equivalence)]]
    [data
     ["." product]
     ["." text
      ["%" format]]]]]
  ["." /// (#+ Snapshot)
   ["#." time]
   ["#." 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 (^slots [#version #snapshot]))
  (%.Format Value)
  (case snapshot
    #///.Local
    version
    
    (#///.Remote stamp)
    (let [(^slots [#///stamp.time #///stamp.build]) stamp]
      (%.format (text.replaced ..snapshot
                               (///time.format time)
                               version)
                ..separator
                (%.nat build)))))