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-rw-r--r--src/Order.purs54
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diff --git a/src/Order.purs b/src/Order.purs
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--- a/src/Order.purs
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-module Order
- ( Order
- , OrderKind(..)
- , OrderDirection(..)
- , init
- , select
- ) where
-
-import Prelude (class Eq, (==))
-import Data.Generic (class Generic, gEq)
-
-type Order =
- { kind :: OrderKind
- , direction :: OrderDirection
- }
-
-data OrderKind =
- Name
- | GlycemicIndex
- | Carbohydrates
- | GlycemicLoad
-
-derive instance genericOrderKind :: Generic OrderKind
-
-instance eqOrderKind :: Eq OrderKind where
- eq = gEq
-
-data OrderDirection =
- Ascending
- | Descending
-
-derive instance genericOrderDirection :: Generic OrderDirection
-
-instance eqOrderDirection :: Eq OrderDirection where
- eq = gEq
-
-init :: Order
-init =
- { kind: Name
- , direction: initDirection
- }
-
-select :: OrderKind -> Order -> Order
-select kind order =
- if order.kind == kind
- then order { direction = otherDirection order.direction }
- else order { kind = kind, direction = initDirection }
-
-otherDirection :: OrderDirection -> OrderDirection
-otherDirection Ascending = Descending
-otherDirection Descending = Ascending
-
-initDirection :: OrderDirection
-initDirection = Ascending