Time.Units

This module contains time unit data structures and functions to work with time.

Time

newtype Time (rat :: Rat)

Time unit is represented as type level rational multiplier with kind Rat.

Constructors

Time

Fields

• unTime :: RatioNat

Instances

Enum (Time rat)

Defined in Time.Units

Methods

succ :: Time rat -> Time rat

pred :: Time rat -> Time rat

toEnum :: Int -> Time rat

fromEnum :: Time rat -> Int

enumFrom :: Time rat -> [Time rat]

enumFromThen :: Time rat -> Time rat -> [Time rat]

enumFromTo :: Time rat -> Time rat -> [Time rat]

enumFromThenTo :: Time rat -> Time rat -> Time rat -> [Time rat]

Eq (Time rat)

Defined in Time.Units

Methods

(==) :: Time rat -> Time rat -> Bool

(/=) :: Time rat -> Time rat -> Bool

Ord (Time rat)

Defined in Time.Units

Methods

compare :: Time rat -> Time rat -> Ordering

(<) :: Time rat -> Time rat -> Bool

(<=) :: Time rat -> Time rat -> Bool

(>) :: Time rat -> Time rat -> Bool

(>=) :: Time rat -> Time rat -> Bool

max :: Time rat -> Time rat -> Time rat

min :: Time rat -> Time rat -> Time rat

KnownUnitName unit => Read (Time unit)

Defined in Time.Units

Methods

readsPrec :: Int -> ReadS (Time unit)

readList :: ReadS [Time unit]

readPrec :: ReadPrec (Time unit)

readListPrec :: ReadPrec [Time unit]

KnownUnitName unit => Show (Time unit)

Defined in Time.Units

Methods

showsPrec :: Int -> Time unit -> ShowS

show :: Time unit -> String

showList :: [Time unit] -> ShowS

Generic (Time rat)

Defined in Time.Units

Associated Types

type Rep (Time rat) :: Type -> Type

Methods

from :: Time rat -> Rep (Time rat) x

to :: Rep (Time rat) x -> Time rat

Semigroup (Time rat)

Addition is associative binary operation for Semigroup of Time.

Defined in Time.Units

Methods

(<>) :: Time rat -> Time rat -> Time rat

sconcat :: NonEmpty (Time rat) -> Time rat

stimes :: Integral b => b -> Time rat -> Time rat

Monoid (Time rat)

Defined in Time.Units

Methods

mempty :: Time rat

mappend :: Time rat -> Time rat -> Time rat

mconcat :: [Time rat] -> Time rat

type Rep (Time rat)

Defined in Time.Units

type Rep (Time rat) = D1 (MetaData "Time" "Time.Units" "o-clock-1.1.0-BRC7d9lwrQ38E2GuhEuAXb" True) (C1 (MetaCons "Time" PrefixI True) (S1 (MetaSel (Just "unTime") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 RatioNat)))

Time data types

type Second = 1 / 1

type Millisecond = Second / 1000

type Microsecond = Millisecond / 1000

type Nanosecond = Microsecond / 1000

type Picosecond = Nanosecond / 1000

type Minute = 60 * Second

type Hour = 60 * Minute

type Day = 24 * Hour

type Week = 7 * Day

type Fortnight = 2 * Week

type family UnitName (unit :: Rat) :: Symbol

Type family for prettier show of time units.

Instances

type UnitName (1 :% 1)

Defined in Time.Units

type UnitName (1 :% 1) = "s"

type UnitName (1 :% 1000)

Defined in Time.Units

type UnitName (1 :% 1000) = "ms"

type UnitName (1 :% 1000000)

Defined in Time.Units

type UnitName (1 :% 1000000) = "mcs"

type UnitName (1 :% 1000000000)

Defined in Time.Units

type UnitName (1 :% 1000000000) = "ns"

type UnitName (1 :% 1000000000000)

Defined in Time.Units

type UnitName (1 :% 1000000000000) = "ps"

type UnitName (60 :% 1)

Defined in Time.Units

type UnitName (60 :% 1) = "m"

type UnitName (3600 :% 1)

Defined in Time.Units

type UnitName (3600 :% 1) = "h"

type UnitName (86400 :% 1)

Defined in Time.Units

type UnitName (86400 :% 1) = "d"

type UnitName (604800 :% 1)

Defined in Time.Units

type UnitName (604800 :% 1) = "w"

type UnitName (1209600 :% 1)

Defined in Time.Units

type UnitName (1209600 :% 1) = "fn"

type KnownUnitName unit = KnownSymbol (UnitName unit)

Constraint alias for KnownSymbol UnitName.

type KnownRatName unit = (KnownUnitName unit, KnownRat unit)

Constraint alias for KnownUnitName and KnownRat for time unit.

unitNameVal :: forall (unit :: Rat). KnownUnitName unit => String

Returns type-level Symbol of the time unit converted to String.

Creation helpers

time :: RatioNat -> Time unit

Creates Time of some type from given Natural.

floorUnit :: forall (unit :: Rat). Time unit -> Time unit

Similar to floor, but works with Time units.

>>> floorUnit @Day (Time $ 5 % 2)
2d

>>> floorUnit (Time @Second $ 2 % 3)
0s

>>> floorUnit $ ps 42
42ps

floorRat :: forall (unit :: Rat) b. Integral b => Time unit -> b

Returns the greatest integer not greater than given Time.

toNum :: forall (unitTo :: Rat) n (unit :: Rat). (KnownDivRat unit unitTo, Num n) => Time unit -> n

Convert time to the Num in given units.

For example, instead of writing

foo :: POSIXTime
foo = 10800  -- 3 hours

one can write more safe implementation:

foo = toNum @Second $ hour 3

Examples:

>>> toNum @Second @Natural $ hour 3
10800

>>> toNum @Minute @Int $ hour 3
180

>>> toNum @Hour @Natural $ hour 3
3

sec :: RatioNat -> Time Second

Creates Second from given Natural.

>>> sec 42
42s

ms :: RatioNat -> Time Millisecond

Creates Millisecond from given Natural.

>>> ms 42
42ms

mcs :: RatioNat -> Time Microsecond

Creates Microsecond from given Natural.

>>> mcs 42
42mcs

ns :: RatioNat -> Time Nanosecond

Creates Nanosecond from given Natural.

>>> ns 42
42ns

ps :: RatioNat -> Time Picosecond

Creates Picosecond from given Natural.

>>> ps 42
42ps

minute :: RatioNat -> Time Minute

Creates Minute from given Natural.

>>> minute 42
42m

hour :: RatioNat -> Time Hour

Creates Hour from given Natural.

>>> hour 42
42h

day :: RatioNat -> Time Day

Creates Day from given Natural.

>>> day 42
42d

week :: RatioNat -> Time Week

Creates Week from given Natural.

>>> week 42
42w

fortnight :: RatioNat -> Time Fortnight

Creates Fortnight from given Natural.

>>> fortnight 42
42fn

Functions

toUnit :: forall (unitTo :: Rat) (unitFrom :: Rat). KnownDivRat unitFrom unitTo => Time unitFrom -> Time unitTo

Converts from one time unit to another time unit.

>>> toUnit @Hour (minute 120)
2h

>>> toUnit @Second (ms 7)
7/1000s

>>> toUnit @Week (Time @Day 45)
6+3/7w

>>> toUnit @Second @Minute (Time 3)
180s

>>> toUnit (day 42000000) :: Time Second
3628800000000s

threadDelay :: forall (unit :: Rat) m. (KnownDivRat unit Microsecond, MonadIO m) => Time unit -> m ()

Convenient version of threadDelay which takes any time-unit and operates in any MonadIO.

>>> threadDelay $ sec 2
>>> threadDelay (2 :: Time Second)
>>> threadDelay @Second 2

getCPUTime :: forall (unit :: Rat) m. (KnownDivRat Picosecond unit, MonadIO m) => m (Time unit)

Similar to getCPUTime but returns the CPU time used by the current program in the given time unit. The precision of this result is implementation-dependent.

>>> getCPUTime @Second
1064046949/1000000000s

timeout

Arguments

:: forall (unit :: Rat). (MonadIO m, KnownDivRat unit Microsecond)

=> Time unit

time

-> IO a

IO action

-> m (Maybe a)

returns Nothing if no result is available within the given time

Similar to timeout but receiving any time unit instead of number of microseconds.

>>> timeout (sec 1) (putStrLn "Hello O'Clock")
Hello O'Clock
Just ()

>>> timeout (ps 1) (putStrLn "Hello O'Clock")
Nothing

>>> timeout (mcs 1) (putStrLn "Hello O'Clock")
HellNothing