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{-# LANGUAGE PackageImports #-}
module Propellor.PropAccum
( host
, PropAccum(..)
, (&)
, (&^)
, (!)
, propigateContainer
) where
import Data.Monoid
import Propellor.Types
import Propellor.Property
import Propellor.Types.Info
import Propellor.PrivData
-- | Starts accumulating the properties of a Host.
--
-- > host "example.com"
-- > & someproperty
-- > ! oldproperty
-- > & otherproperty
host :: HostName -> Host
host hn = Host hn [] mempty
-- | Something that can accumulate properties.
class PropAccum h where
-- | Adds a property.
addProp :: IsProp p => h -> p -> h
-- | Like addProp, but adds the property at the front of the list.
addPropFront :: IsProp p => h -> p -> h
getProperties :: h -> [Property HasInfo]
-- | Adds a property to a `Host` or other `PropAccum`
--
-- Can add Properties and RevertableProperties
(&) :: (PropAccum h, IsProp p) => h -> p -> h
(&) = addProp
-- | Adds a property before any other properties.
(&^) :: (PropAccum h, IsProp p) => h -> p -> h
(&^) = addPropFront
-- | Adds a property in reverted form.
(!) :: PropAccum h => h -> RevertableProperty -> h
h ! p = h & revert p
infixl 1 &
infixl 1 &^
infixl 1 !
instance PropAccum Host where
(Host hn ps is) `addProp` p = Host hn (ps ++ [toProp p])
(is <> getInfoRecursive p)
(Host hn ps is) `addPropFront` p = Host hn (toProp p : ps)
(getInfoRecursive p <> is)
getProperties = hostProperties
-- | Adjust the provided Property, adding to its
-- propertyChidren the properties of the provided container.
--
-- The Info of the propertyChildren is adjusted to only include
-- info that should be propigated out to the Property.
--
-- Any PrivInfo that uses HostContext is adjusted to use the name
-- of the container as its context.
propigateContainer
:: (PropAccum container)
=> String
-> container
-> Property HasInfo
-> Property HasInfo
propigateContainer containername c prop = infoProperty
(propertyDesc prop)
(propertySatisfy prop)
(propertyInfo prop)
(propertyChildren prop ++ hostprops)
where
hostprops = map go $ getProperties c
go p =
let i = mapInfo (forceHostContext containername)
(propigatableInfo (propertyInfo p))
cs = map go (propertyChildren p)
in infoProperty (propertyDesc p) (propertySatisfy p) i cs
|
