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... https://en.wikipedia.org/wiki/Variadic_function
(.require
[library
[lux (.except def)
[abstract
[monad (.only do)]]
[control
["?" parser]
["[0]" exception (.only Exception)]]
[data
["[0]" text (.only)
["%" \\format]]
[collection
["[0]" list (.use "[1]#[0]" monad)]
["[0]" set]]]
[math
[number
["n" nat]]]
["[0]" meta (.only)
["[0]" code (.only)
["?[1]" \\parser]]
[macro (.only with_symbols)
[syntax (.only syntax)
["[0]" export]]]]]])
(exception.def .public (duplicate_parameters [definition parameters])
(Exception [Symbol (List Text)])
(exception.report
(list ["Definition" (%.symbol definition)]
["Parameters" (%.list %.text parameters)])))
(exception.def .public (must_have_rest_parameter definition)
(Exception Symbol)
(exception.report
(list ["Definition" (%.symbol definition)])))
(.def .public def
(syntax (_ [[exported? [name parameters] type body]
(export.parser (all ?.and
(?code.form (?.and ?code.local (?.some ?code.local)))
?code.any
?code.any))])
(do meta.monad
[here meta.current_module_name]
(if (n.= (list.size parameters)
(set.size (set.of_list text.hash parameters)))
(with_symbols [g!function]
(when (list.reversed parameters)
(list.partial &rest mandatory)
(let [mandatory (list#each code.local (list.reversed mandatory))
&rest (code.local &rest)]
(in (list (` (.def (, exported?) ((, g!function) (,* mandatory) (, &rest))
(, type)
(, body)))
(` (.def (, exported?) (, (code.local name))
(syntax ((, (code.local name)) [(,* (|> mandatory
(list#each (function (_ parameter)
(list parameter (` ?code.any))))
list#conjoint))
(, &rest) (?.some ?code.any)])
(at meta.monad (,' in)
(list (` ((, g!function)
(,* (list#each (|>> , ((,' .,)) `) mandatory))
(list ((,' .,*) (, &rest)))))))))))))
_
(meta.failure (exception.error ..must_have_rest_parameter [[here name]]))))
(meta.failure (exception.error ..duplicate_parameters [[here name] parameters]))))))
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