31 lines
944 B
Haskell
31 lines
944 B
Haskell
{-# LANGUAGE TypeFamilies #-}
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module Propellor.Types.Container where
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-- | A value that can be bound between the host and a container.
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--
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-- For example, a Bound Port is a Port on the container that is bound to
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-- a Port on the host.
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data Bound v = Bound
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{ hostSide :: v
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, containerSide :: v
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}
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-- | Create a Bound value, from two different values for the host and
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-- container.
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--
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-- For example, @Port 8080 -<- Port 80@ means that port 8080 on the host
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-- is bound to port 80 from the container.
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(-<-) :: (hostv ~ v, containerv ~ v) => hostv -> containerv -> Bound v
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(-<-) hostv containerv = Bound hostv containerv
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-- | Flipped version of -<- with the container value first and host value
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-- second.
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(->-) :: (containerv ~ v, hostv ~ v) => hostv -> containerv -> Bound v
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(->-) containerv hostv = Bound hostv containerv
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-- | Create a Bound value, that is the same on both the host and container.
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same :: v -> Bound v
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same v = Bound v v
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