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(.module:
  [library
   [lux {"-" [Module Source]}
    [control
     [pipe {"+" [case>]}]
     ["<>" parser
      ["[0]" cli {"+" [Parser]}]]]
    [tool
     [compiler
      [meta
       [archive
        [descriptor {"+" [Module]}]]]]]
    [world
     [file {"+" [Path]}]]]])

(type: .public Source
  Path)

(type: .public Host_Dependency
  Path)

(type: .public Library
  Path)

(type: .public Target
  Path)

(type: .public Compilation
  [(List Source) (List Host_Dependency) (List Library) Target Module])

(type: .public Export
  [(List Source) Target])

(type: .public Service
  (Variant
   (#Compilation Compilation)
   (#Interpretation Compilation)
   (#Export Export)))

(template [<name> <long> <type>]
  [(def: <name>
     (Parser <type>)
     (cli.named <long> cli.any))]

  [source_parser "--source" Source]
  [host_dependency_parser "--host_dependency" Host_Dependency]
  [library_parser "--library" Library]
  [target_parser "--target" Target]
  [module_parser "--module" Module]
  )

(def: .public service
  (Parser Service)
  ($_ <>.or
      (<>.after (cli.this "build")
                ($_ <>.and
                    (<>.some ..source_parser)
                    (<>.some ..host_dependency_parser)
                    (<>.some ..library_parser)
                    ..target_parser
                    ..module_parser))
      (<>.after (cli.this "repl")
                ($_ <>.and
                    (<>.some ..source_parser)
                    (<>.some ..host_dependency_parser)
                    (<>.some ..library_parser)
                    ..target_parser
                    ..module_parser))
      (<>.after (cli.this "export")
                ($_ <>.and
                    (<>.some ..source_parser)
                    ..target_parser))
      ))

(def: .public target
  (-> Service Target)
  (|>> (case> (^or (#Compilation [sources host_dependencies libraries target module])
                   (#Interpretation [sources host_dependencies libraries target module])
                   (#Export [sources target]))
              target)))