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(.using
 [library
  [lux {"-" Source}
   [abstract
    ["[0]" monad {"+" do}]]
   [control
    ["[0]" try {"+" Try}]
    [concurrency
     ["[0]" async {"+" Async}]]]
   [data
    ["[0]" text
     ["%" format {"+" format}]]
    [collection
     ["[0]" dictionary]
     ["[0]" sequence]]
    [format
     ["[0]" binary]
     ["[0]" tar]]]
   [time
    ["[0]" instant]]
   [tool
    [compiler
     [meta
      [cli {"+" Source Export}]
      ["[0]" io "_"
       ["[1]" context {"+" Extension}]]]]]
   [world
    ["[0]" file]]]])

(def: file
  "library.tar")

(def: no_ownership
  tar.Ownership
  (let [commons (: tar.Owner
                   [tar.#name tar.anonymous
                    tar.#id tar.no_id])]
    [tar.#user commons
     tar.#group commons]))

(def: .public (library fs sources)
  (-> (file.System Async) (List Source) (Async (Try tar.Tar)))
  (do (try.with async.monad)
    [files (io.listing fs sources)]
    (|> (dictionary.entries files)
        (monad.each try.monad
                    (function (_ [path source_code])
                      (do try.monad
                        [path (|> path
                                  (text.replaced (# fs separator) .module_separator)
                                  tar.path)
                         source_code (tar.content source_code)]
                        (in {tar.#Normal [path
                                          (instant.of_millis +0)
                                          ($_ tar.and
                                              tar.read_by_owner tar.write_by_owner
                                              tar.read_by_group tar.write_by_group
                                              tar.read_by_other)
                                          ..no_ownership
                                          source_code]}))))
        (# try.monad each sequence.of_list)
        (# async.monad in))))

(def: .public (export fs [sources target])
  (-> (file.System Async) Export (Async (Try Any)))
  (do [! (try.with async.monad)]
    [tar (# ! each (binary.result tar.writer)
            (..library fs sources))]
    (|> ..file
        (format target (# fs separator))
        (# fs write tar))))