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(.module:
[lux #*
[abstract
[monad (#+ do)]]
[control
["<>" parser
["<.>" text (#+ Parser)]]]
[data
[text
["%" format]]]
[math
[number
["n" nat]]]
[time
["." date (#+ Date)]
["." year]
["." month]]])
(def: #export (pad value)
(-> Nat Text)
(if (n.< 10 value)
(%.format "0" (%.nat value))
(%.nat value)))
(def: #export (format value)
(%.Format Date)
(%.format (|> value date.year year.value .nat %.nat)
(|> value date.month month.number ..pad)
(|> value date.day_of_month ..pad)))
(def: #export parser
(Parser Date)
(do <>.monad
[year (<>.codec n.decimal (<text>.exactly 4 <text>.decimal))
year (<>.lift (year.year (.int year)))
month (<>.codec n.decimal (<text>.exactly 2 <text>.decimal))
month (<>.lift (month.by_number month))
day_of_month (<>.codec n.decimal (<text>.exactly 2 <text>.decimal))]
(<>.lift (date.date year month day_of_month))))
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