(.module:
  [lux #*
   [abstract
    [equivalence (#+ Equivalence)]]
   [data
    ["." product]
    ["." text
     ["%" format]]]]
  ["." /// (#+ Snapshot)
   ["#." time]
   ["#." stamp]])

(type: #export Value
  {#version Text
   #snapshot Snapshot})

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

(def: separator
  "-")

(def: #export snapshot
  "SNAPSHOT")

(def: #export (format (^slots [#version #snapshot]))
  (%.Format Value)
  (case snapshot
    #///.Local
    version
    
    (#///.Remote stamp)
    (let [(^slots [#///stamp.time #///stamp.build]) stamp]
      (%.format (text.replace_all ..snapshot
                                  (///time.format time)
                                  version)
                ..separator
                (%.nat build)))))