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README
modulespection
Template Haskell Module Introspection
Collect all of the declarations in a module using Template Haskell (via the GHC API).
One can either get all the names, or just the declarations (only type declarations are supported right now).
Here is a quick example:
import Language.Haskell.TH.Module.Magic (names)
data Test = Test Int
newtype OtherTest = OtherTest Test
someFunction :: String -> String
someFunction = id
-- 'names' is Template Haskell function that will collect all of the
-- toplevel declaration names of the current file.
names >>= runIO . print >> return []
Which will spew the following when compiling:
[Test,OtherTest,someFunction]
There is also declarations
which can be used, for example, to make sure that all
types have ToJSON
/FromJSON
instances.
import Data.Aeson.TH (deriveJSON, defaultOptions)
import MonadUtils (concatMapM)
import Language.Haskell.TH.Module.Magic (names)
data Test = Test Int
newtype OtherTest = OtherTest Test
concatMapM (deriveJSON defaultOptions) =<< names
Which will make JSON instances for Test
, OtherTest
and any other types
added to the file.
You can also do the same thing for an existing module.
import Data.Aeson.TH (deriveJSON, defaultOptions)
import MonadUtils (concatMapM)
import Language.Haskell.TH.Module.Magic (moduleNames)
import Data.Monoid
concatMapM (deriveJSON defaultOptions) =<< moduleNames "Data.Monoid"
Which will build instances for all the types in Data.Monoid
.