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(.using
 [library
  [lux (.except)
   [abstract
    [monad (.only do)]]
   [control
    ["[0]" try (.only Try)]
    [concurrency
     ["[0]" async (.only Async)]]]
   [data
    ["[0]" text (.only)
     ["%" format (.only format)]]]
   [world
    [program (.only Program)]
    ["[0]" file]
    [net
     ["[0]" uri (.only URI)]]]]]
 ["[0]" // (.only)
  ["/[1]" //
   ["[1][0]" local]
   ["[1][0]" metadata]]])

(def: .public (root program fs)
  (-> (Program Async) (file.System Async) file.Path)
  (let [/ (at fs separator)]
    (|> ///local.repository
        (text.replaced uri.separator /)
        (format (at program home) /))))

(def: (path /)
  (-> Text (-> URI file.Path))
  (text.replaced uri.separator /))

(def: (absolute_path program fs)
  (-> (Program Async) (file.System Async) (-> URI file.Path))
  (let [/ (at fs separator)]
    (|>> ///metadata.local_uri
         (..path /)
         (format (..root program fs) /))))

(implementation: .public (repository program fs)
  (-> (Program Async) (file.System Async) (//.Repository Async))

  (def: description
    (..root program fs))

  (def: download
    (|>> (..absolute_path program fs)
         (at fs read)))

  (def: (upload uri content)
    (do [! async.monad]
      [.let [absolute_path (..absolute_path program fs uri)]
       ? (at fs file? absolute_path)
       _ (is (Async (Try Any))
             (if ?
               (in {try.#Success []})
               (case (file.parent fs absolute_path)
                 {.#Some parent}
                 (file.make_directories async.monad fs parent)

                 _
                 (in {try.#Success []}))))]
      (at fs write absolute_path content))))