cmdargs-0.10.16: Command line argument processing

Safe Haskell | None
Language | Haskell2010

System.Console.CmdArgs.Verbosity

Description

A module to deal with verbosity, how 'chatty' a program should be. This module defines the `Verbosity` data type, along with functions for manipulating a global verbosity value.

Synopsis

- data Verbosity
  - = Quiet
  - | Normal
  - | Loud
- setVerbosity :: Verbosity -> IO ()
- getVerbosity :: IO Verbosity
- isNormal :: IO Bool
- isLoud :: IO Bool
- whenNormal :: IO () -> IO ()
- whenLoud :: IO () -> IO ()

# Documentation

data Verbosity #

The verbosity data type

Constructors

Quiet | Only output essential messages (typically errors)
Normal | Output normal messages (typically errors and warnings)
Loud | Output lots of messages (typically errors, warnings and status updates)

Instances

Bounded Verbosity # |
Methods minBound :: Verbosity # maxBound :: Verbosity #
Enum Verbosity # |
Methods succ :: Verbosity -> Verbosity # pred :: Verbosity -> Verbosity # toEnum :: Int -> Verbosity # fromEnum :: Verbosity -> Int # enumFrom :: Verbosity -> [Verbosity] # enumFromThen :: Verbosity -> Verbosity -> [Verbosity] # enumFromTo :: Verbosity -> Verbosity -> [Verbosity] # enumFromThenTo :: Verbosity -> Verbosity -> Verbosity -> [Verbosity] #
Eq Verbosity # |
Methods (==) :: Verbosity -> Verbosity -> Bool # (/=) :: Verbosity -> Verbosity -> Bool #
Data Verbosity # |
Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Verbosity -> c Verbosity # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Verbosity # toConstr :: Verbosity -> Constr # dataTypeOf :: Verbosity -> DataType # dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c Verbosity) # dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Verbosity) # gmapT :: (forall b. Data b => b -> b) -> Verbosity -> Verbosity # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Verbosity -> r # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Verbosity -> r # gmapQ :: (forall d. Data d => d -> u) -> Verbosity -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> Verbosity -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Verbosity -> m Verbosity # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Verbosity -> m Verbosity # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Verbosity -> m Verbosity #
Ord Verbosity # |
Methods compare :: Verbosity -> Verbosity -> Ordering # (<) :: Verbosity -> Verbosity -> Bool # (<=) :: Verbosity -> Verbosity -> Bool # (>) :: Verbosity -> Verbosity -> Bool # (>=) :: Verbosity -> Verbosity -> Bool # max :: Verbosity -> Verbosity -> Verbosity # min :: Verbosity -> Verbosity -> Verbosity #
Read Verbosity # |
Methods readsPrec :: Int -> ReadS Verbosity # readList :: ReadS [Verbosity] # readPrec :: ReadPrec Verbosity # readListPrec :: ReadPrec [Verbosity] #
Show Verbosity # |
Methods showsPrec :: Int -> Verbosity -> ShowS # show :: Verbosity -> String # showList :: [Verbosity] -> ShowS #

setVerbosity :: Verbosity -> IO () #

Set the global verbosity.

getVerbosity :: IO Verbosity #

Get the global verbosity. Initially `Normal` before any calls to `setVerbosity`.

isNormal :: IO Bool #

Used to test if warnings should be output to the user. `True` if the verbosity is set to `Normal` or `Loud` (when `--quiet` is not specified).

isLoud :: IO Bool #

Used to test if status updates should be output to the user. `True` if the verbosity is set to `Loud` (when `--verbose` is specified).

whenNormal :: IO () -> IO () #

An action to perform if the verbosity is normal or higher, based on `isNormal`.

whenLoud :: IO () -> IO () #

An action to perform if the verbosity is loud, based on `isLoud`.