Text.Chatty.Expansion.Vars

Documentation

data EnvVar

Some environment variable

Constructors

NotSet

Not set.

Literal String

An embeddable string.

Show a => Scalar a

Something we can show.

Array [EnvVar]

Array of that

Instances

Show EnvVar

Methods

showsPrec :: Int -> EnvVar -> ShowS

show :: EnvVar -> String

showList :: [EnvVar] -> ShowS

newtype ExpanderT m a

Environment storage and variable expander.

Constructors

Expander

Fields

• runExpanderT :: [(String, EnvVar)] -> m (a, [(String, EnvVar)])

Instances

MonadTrans ExpanderT

Methods

lift :: Monad m => m a -> ExpanderT m a

Monad m => Monad (ExpanderT m)

Methods

(>>=) :: ExpanderT m a -> (a -> ExpanderT m b) -> ExpanderT m b

(>>) :: ExpanderT m a -> ExpanderT m b -> ExpanderT m b

return :: a -> ExpanderT m a

fail :: String -> ExpanderT m a

Monad m => Functor (ExpanderT m)

Methods

fmap :: (a -> b) -> ExpanderT m a -> ExpanderT m b

(<$) :: a -> ExpanderT m b -> ExpanderT m a

Monad m => Applicative (ExpanderT m)

Methods

pure :: a -> ExpanderT m a

(<*>) :: ExpanderT m (a -> b) -> ExpanderT m a -> ExpanderT m b

(*>) :: ExpanderT m a -> ExpanderT m b -> ExpanderT m b

(<*) :: ExpanderT m a -> ExpanderT m b -> ExpanderT m a

MonadIO m => MonadIO (ExpanderT m)

Methods

liftIO :: IO a -> ExpanderT m a

ChExpand m => ChExpand (ExpanderT m)

Methods

expand :: String -> ExpanderT m String

Monad m => ChExpanderEnv (ExpanderT m)

Methods

mgetv :: String -> ExpanderT m EnvVar

mputv :: String -> EnvVar -> ExpanderT m ()

localEnvironment :: Functor m => ExpanderT m a -> m a

Run this function inside a blank environment.

forkEnvironment :: (Functor m, Monad m, MonadIO m) => ExpanderT m a -> m a

Run this function in a locally modifiable, but not exported environment

exportAll :: (Monad m, MonadIO m) => ExpanderT m ()

Export this local environment.

expandVars :: (Monad m, Functor m, ChExpanderEnv m) => String -> m String

Expand $variables

isAnum :: Char -> Bool

Is alphanumeric?

class Monad ee => ChExpanderEnv ee where

Typeclass for all environment storages.

Minimal complete definition

mgetv, mputv

Methods

mgetv :: String -> ee EnvVar

Get environment variable

mputv :: String -> EnvVar -> ee ()

Put environment variable

Instances

ChExpanderEnv IO

Methods

mgetv :: String -> IO EnvVar

mputv :: String -> EnvVar -> IO ()

Monad m => ChExpanderEnv (ExpanderT m)

Methods

mgetv :: String -> ExpanderT m EnvVar

mputv :: String -> EnvVar -> ExpanderT m ()

Orphan instances

ChExpand IO

Methods

expand :: String -> IO String