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## Copyright (c) Eduardo Julian. All rights reserved.
## This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
## If a copy of the MPL was not distributed with this file,
## You can obtain one at http://mozilla.org/MPL/2.0/.
(;module:
lux
(lux [io]
(control monad)
(data ["&" log]
[text "Text/" Monoid<Text> Eq<Text>]
[number]
[product])
(codata function)
pipe)
lux/test)
(test: "Logs"
(let [(^open "&/") (&;Monad<Log> text;Monoid<Text>)]
($_ seq
(assert "Functor respects Log."
(i.= 11 (product;right (&/map i.inc ["" 10]))))
(assert "Applicative respects Log."
(and (i.= 20 (product;right (&/wrap 20)))
(i.= 30 (product;right (&/apply (&/wrap (i.+ 10)) (&/wrap 20))))))
(assert "Monad respects Log."
(i.= 30 (product;right (do (&;Monad<Log> text;Monoid<Text>)
[f (wrap i.+)
a (wrap 10)
b (wrap 20)]
(wrap (f a b))))))
(assert "Can log any value."
(Text/= "YOLO" (product;left (&;log "YOLO"))))
)))
(test: "Monad transformer"
(let [lift (&;lift-log text;Monoid<Text> io;Monad<IO>)
(^open "io/") io;Monad<IO>]
(assert "Can add log functionality to any monad."
(|> (io;run (do (&;LogT text;Monoid<Text> io;Monad<IO>)
[a (lift (io/wrap 123))
b (wrap 456)]
(wrap (i.+ a b))))
(case> ["" 579] true
_ false)))
))
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