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(.module:
  [lux (#- Module)
   [abstract
    ["." monad (#+ Monad do)]]
   [control
    ["." try (#+ Try)]
    ["." exception (#+ exception:)]
    [concurrency
     ["." promise (#+ Promise) ("#\." monad)]]
    ["<>" parser
     ["<.>" binary]]]
   [data
    [binary (#+ Binary)]
    ["." text
     ["%" format (#+ format)]]
    [collection
     ["." dictionary (#+ Dictionary)]
     ["." row]]
    [format
     ["." tar]]]
   [tool
    [compiler
     [meta
      [archive
       [descriptor (#+ Module)]]]]]
   [world
    ["." file]]]
  [//
   [cli (#+ Library)]])

(def: Action
  (type (All [a] (Promise (Try a)))))

(exception: #export useless_tar_entry)

(exception: #export (duplicate {library Library} {module Module})
  (exception.report
   ["Module" (%.text module)]
   ["Library" (%.text library)]))

(type: #export Import
  (Dictionary file.Path Binary))

(def: (import_library system library import)
  (-> (file.System Promise) Library Import (Action Import))
  (let [! promise.monad]
    (|> library
        (\ system read)
        (\ ! map (let [! try.monad]
                   (|>> (\ ! map (<binary>.run tar.parser))
                        (\ ! join)
                        (\ ! map (|>> row.to_list
                                      (monad.fold ! (function (_ entry import)
                                                      (case entry
                                                        (#tar.Normal [path instant mode ownership content])
                                                        (let [path (tar.from_path path)]
                                                          (case (dictionary.try_put path (tar.data content) import)
                                                            (#try.Failure error)
                                                            (exception.throw ..duplicate [library path])

                                                            import'
                                                            import'))
                                                        
                                                        _
                                                        (exception.throw ..useless_tar_entry [])))
                                                  import)))
                        (\ ! join)))))))

(def: #export (import system libraries)
  (-> (file.System Promise) (List Library) (Action Import))
  (monad.fold (: (Monad Action)
                 (try.with promise.monad))
              (..import_library system)
              (dictionary.new text.hash)
              libraries))