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module Cron (parse, toProse) where
import Common (asOrdinal, leftPad, listToProse, showDayOfWeek, showMonth, (?:))
import qualified Cron.Expr as E
import qualified Cron.Schedule as S
import Data.List.NonEmpty (NonEmpty ((:|)))
import Intro
parse :: String -> Either String S.Schedule
parse s = case words s of
[mn, h, dom, m, dow] -> S.fromParts mn h dom m dow
xs ->
Left
$ "Invalid cron "
++ s
++ ": not enough qualifiers, expecting 5 but only got "
++ (show . length) xs
toProse :: S.Schedule -> String
toProse s =
mconcat
[ proseTime s.minute s.hour
, ", "
, proseDate s.dayOfMonth s.month s.dayOfWeek
]
proseDate :: E.Expr -> E.Expr -> E.Expr -> String
proseDate dom mt dow = case (dom, mt, dow) of
(E.Every, E.Every, E.Every) -> "daily"
(E.Every, _, E.Every) -> "daily " ++ proseMonth mt
(E.Every, E.Every, E.Multi ns) -> "every " ++ listToProse (dayOfWeek <$> ns)
(E.Every, E.Every, E.Range _ _) -> proseDayOfWeek dow
(E.Every, _, E.Multi ns) -> "every " ++ listToProse (dayOfWeek <$> ns) ++ " " ++ proseMonth mt
(_, _, _) -> mconcat [proseDayOfMonth dom, " ", proseMonth mt, " ", proseDayOfWeek dow]
where
dayOfWeek m = showDayOfWeek m ?: "?"
proseDayOfWeek :: E.Expr -> String
proseDayOfWeek = \case
E.Every -> ""
E.Multi ns -> "on " ++ listToProse (dayOfWeek <$> ns)
E.Range n m -> mconcat ["from ", dayOfWeek n, " to ", dayOfWeek m]
E.Step E.StepLEvery 1 -> ""
E.Step E.StepLEvery n -> mconcat ["every ", show n, " days of the week"]
E.Step (E.StepLRange n m) j ->
mconcat
[ "every "
, show j
, " days of the week from "
, dayOfWeek n
, " to "
, dayOfWeek m
]
where
dayOfWeek m = showDayOfWeek m ?: "?"
proseMonth :: E.Expr -> String
proseMonth = \case
E.Every -> "of every month"
E.Multi ns -> "of " ++ listToProse (month <$> ns)
E.Range n m -> mconcat ["from ", month n, " to ", month m]
E.Step E.StepLEvery 1 -> "of every month"
E.Step E.StepLEvery n -> mconcat ["of every ", show n, " months"]
E.Step (E.StepLRange n m) j ->
mconcat
[ "of every "
, show j
, " months from "
, month n
, " to "
, month m
]
where
month m = showMonth m ?: "?"
proseDayOfMonth :: E.Expr -> String
proseDayOfMonth = \case
E.Every -> "daily"
E.Multi ns -> "on the " ++ listToProse (asOrdinal <$> ns)
E.Range n m -> mconcat ["daily from the ", asOrdinal n, " to the ", asOrdinal m]
E.Step E.StepLEvery 1 -> "daily"
E.Step E.StepLEvery n -> mconcat ["every ", show n, " days"]
E.Step (E.StepLRange n m) j ->
mconcat
[ "every "
, show j
, " days from the "
, asOrdinal n
, " to the "
, asOrdinal m
]
proseTime :: E.Expr -> E.Expr -> String
proseTime mn h = case (mn, h) of
(E.Multi (0 :| []), E.Every) -> "At the top of every hour"
(E.Multi (0 :| []), E.Step E.StepLEvery 1) -> "At the top of every hour"
(E.Multi (n :| []), E.Multi (m :| [])) -> mconcat ["At ", leftPad 2 '0' $ show m, ":", leftPad 2 '0' $ show n]
(E.Multi (0 :| []), E.Multi ns) -> mconcat ["At the top of the ", listToProse (asOrdinal <$> ns), " hours"]
(_, E.Every) -> mconcat [proseMinute mn, " of every hour"]
(_, E.Step E.StepLEvery 1) -> mconcat [proseMinute mn, " of every hour"]
(_, _) -> mconcat [proseMinute mn, " ", proseHour h]
proseHour :: E.Expr -> String
proseHour = \case
E.Every -> "every hour"
E.Multi (n :| []) -> mconcat ["at hour ", leftPad 2 '0' $ show n]
E.Multi ns -> "at hours " ++ listToProse (show <$> ns)
E.Range n m -> mconcat ["every hour from ", leftPad 2 '0' $ show n, " to ", leftPad 2 '0' $ show m]
E.Step E.StepLEvery 1 -> "every hour"
E.Step E.StepLEvery n -> mconcat ["every ", show n, " hours"]
E.Step (E.StepLRange n m) j ->
mconcat
[ "every "
, show j
, " hours from "
, show n
, " to "
, show m
]
proseMinute :: E.Expr -> String
proseMinute = \case
E.Every -> "Every minute"
E.Multi (n :| []) -> mconcat ["At minute ", leftPad 2 '0' $ show n]
E.Multi ns -> "At minutes " ++ listToProse (show <$> ns)
E.Range n m -> mconcat ["Every minute from ", leftPad 2 '0' $ show n, " to ", leftPad 2 '0' $ show m]
E.Step E.StepLEvery 1 -> "Every minute"
E.Step E.StepLEvery n -> mconcat ["every ", show n, " minutes"]
E.Step (E.StepLRange n m) j ->
mconcat
[ "every "
, show j
, " minutes from the "
, asOrdinal n
, " minute to the "
, asOrdinal m
, " minute"
]
|
