Cabal-2.0.0.2: A framework for packaging Haskell software

Safe HaskellNone
LanguageHaskell2010

Distribution.Types.UnitId

Synopsis

Documentation

data UnitId Source #

A unit identifier identifies a (possibly instantiated) package/component that can be installed the installed package database. There are several types of components that can be installed:

  • A traditional library with no holes, so that unitIdHash is Nothing. In the absence of Backpack, UnitId is the same as a ComponentId.
  • An indefinite, Backpack library with holes. In this case, unitIdHash is still Nothing, but in the install, there are only interfaces, no compiled objects.
  • An instantiated Backpack library with all the holes filled in. unitIdHash is a Just a hash of the instantiating mapping.

A unit is a component plus the additional information on how the holes are filled in. Thus there is a one to many relationship: for a particular component there are many different ways of filling in the holes, and each different combination is a unit (and has a separate UnitId).

UnitId is distinct from OpenUnitId, in that it is always installed, whereas OpenUnitId are intermediate unit identities that arise during mixin linking, and don't necessarily correspond to any actually installed unit. Since the mapping is not actually recorded in a UnitId, you can't actually substitute over them (but you can substitute over OpenUnitId). See also Distribution.Backpack.FullUnitId for a mechanism for expanding an instantiated UnitId to retrieve its mapping.

Backwards compatibility note: if you need to get the string representation of a UnitId to pass, e.g., as a -package-id flag, use the display function, which will work on all versions of Cabal.

Instances

Eq UnitId Source # 

Methods

(==) :: UnitId -> UnitId -> Bool #

(/=) :: UnitId -> UnitId -> Bool #

Data UnitId Source # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> UnitId -> c UnitId #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c UnitId #

toConstr :: UnitId -> Constr #

dataTypeOf :: UnitId -> DataType #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c UnitId) #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c UnitId) #

gmapT :: (forall b. Data b => b -> b) -> UnitId -> UnitId #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> UnitId -> r #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> UnitId -> r #

gmapQ :: (forall d. Data d => d -> u) -> UnitId -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> UnitId -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> UnitId -> m UnitId #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> UnitId -> m UnitId #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> UnitId -> m UnitId #

Ord UnitId Source # 
Read UnitId Source # 
Show UnitId Source # 
IsString UnitId Source #

mkUnitId

Since: 2.0

Methods

fromString :: String -> UnitId #

Generic UnitId Source # 

Associated Types

type Rep UnitId :: * -> * #

Methods

from :: UnitId -> Rep UnitId x #

to :: Rep UnitId x -> UnitId #

Binary UnitId Source # 

Methods

put :: UnitId -> Put #

get :: Get UnitId #

putList :: [UnitId] -> Put #

NFData UnitId Source # 

Methods

rnf :: UnitId -> () #

Text UnitId Source #

The textual format for UnitId coincides with the format GHC accepts for -package-id.

type Rep UnitId Source # 
type Rep UnitId = D1 * (MetaData "UnitId" "Distribution.Types.UnitId" "Cabal-2.0.0.2-2Zlp9pb6VMT53EjzrKmvLM" True) (C1 * (MetaCons "UnitId" PrefixI False) (S1 * (MetaSel (Nothing Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 * ShortText)))

unUnitId :: UnitId -> String Source #

If you need backwards compatibility, consider using display instead, which is supported by all versions of Cabal.

data DefUnitId Source #

A UnitId for a definite package. The DefUnitId invariant says that a UnitId identified this way is definite; i.e., it has no unfilled holes.

Instances

Eq DefUnitId Source # 
Data DefUnitId Source # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> DefUnitId -> c DefUnitId #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c DefUnitId #

toConstr :: DefUnitId -> Constr #

dataTypeOf :: DefUnitId -> DataType #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c DefUnitId) #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c DefUnitId) #

gmapT :: (forall b. Data b => b -> b) -> DefUnitId -> DefUnitId #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> DefUnitId -> r #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> DefUnitId -> r #

gmapQ :: (forall d. Data d => d -> u) -> DefUnitId -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> DefUnitId -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> DefUnitId -> m DefUnitId #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> DefUnitId -> m DefUnitId #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> DefUnitId -> m DefUnitId #

Ord DefUnitId Source # 
Read DefUnitId Source # 
Show DefUnitId Source # 
Generic DefUnitId Source # 

Associated Types

type Rep DefUnitId :: * -> * #

Binary DefUnitId Source # 
NFData DefUnitId Source # 

Methods

rnf :: DefUnitId -> () #

Text DefUnitId Source # 
type Rep DefUnitId Source # 
type Rep DefUnitId = D1 * (MetaData "DefUnitId" "Distribution.Types.UnitId" "Cabal-2.0.0.2-2Zlp9pb6VMT53EjzrKmvLM" True) (C1 * (MetaCons "DefUnitId" PrefixI True) (S1 * (MetaSel (Just Symbol "unDefUnitId") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 * UnitId)))

unsafeMkDefUnitId :: UnitId -> DefUnitId Source #

Unsafely create a DefUnitId from a UnitId. Your responsibility is to ensure that the DefUnitId invariant holds.

newSimpleUnitId :: ComponentId -> UnitId Source #

Create a unit identity with no associated hash directly from a ComponentId.

mkLegacyUnitId :: PackageId -> UnitId Source #

Make an old-style UnitId from a package identifier. Assumed to be for the public library

getHSLibraryName :: UnitId -> String Source #

Returns library name prefixed with HS, suitable for filenames

type InstalledPackageId = UnitId Source #

Deprecated: Use UnitId instead