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Tagged.hs
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Tagged.hs
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module Tagged
( taggedMainSplit,
taggedMainJoined,
)
where
import Polysemy
import Polysemy.Reader
import Polysemy.Tagged
displayName :: Members '[Reader String, Embed IO] r => Sem r ()
displayName = do
name <- ask
embed $ putStrLn $ "Your name is " <> name
displayLocation :: Members '[Reader String, Embed IO] r => Sem r ()
displayLocation = do
location <- ask
embed $ putStrLn $ "Your location is " <> location
displaySplit :: Members '[Tagged "name" (Reader String), Tagged "location" (Reader String), Embed IO] r => Sem r ()
displaySplit = do
tag @"name" @(Reader String) displayName
tag @"location" @(Reader String) displayLocation
displayJoined :: Members '[Tagged "name" (Reader String), Tagged "location" (Reader String), Embed IO] r => Sem r ()
displayJoined = do
name <- tag @"name" @(Reader String) ask
location <- tag @"location" @(Reader String) ask
embed $ putStrLn $ "Your name is " <> name
embed $ putStrLn $ "Your location is " <> location
runApp :: Sem '[Tagged "name" (Reader String), Tagged "location" (Reader String), Embed IO] a -> IO a
runApp =
runM
. runReader "France"
. untag @"location"
. runReader "Gautier"
. untag @"name"
taggedMainSplit :: IO ()
taggedMainSplit = runApp displaySplit
taggedMainJoined :: IO ()
taggedMainJoined = runApp displayJoined