Safe Haskell | Safe |
---|---|
Language | Haskell2010 |
Synopsis
- type OptReader a = String -> Either String a
- data Opt a = Opt {
- _optLong :: Maybe String
- _optShort :: Maybe Char
- _optHelp :: Maybe String
- _optMetavar :: Maybe String
- _optEnvVar :: Maybe String
- _optDefaultVal :: Maybe a
- _optDefaultStr :: Maybe String
- _optReader :: OptReader a
- _optType :: OptType a
- data OptType a
- data OptAttr
- data OptionOpt (attr :: [OptAttr]) a = OptionOpt {}
- data FlagOpt (attr :: [OptAttr]) a = FlagOpt {}
- data ArgumentOpt (attr :: [OptAttr]) a = ArgumentOpt {}
- data SomeOpt where
- type Environment = [(String, String)]
- type Args = [String]
- data HargCtx = HargCtx {
- _hcEnv :: Environment
- _hcArgs :: Args
- getCtx :: IO HargCtx
- ctxFromArgs :: Args -> IO HargCtx
- ctxFromEnv :: Environment -> IO HargCtx
- pureCtx :: Environment -> Args -> HargCtx
Documentation
The basic option type
Opt | |
|
Option types
OptionOptType | |
FlagOptType a |
|
ArgumentOptType |
Intermediate option types
data OptionOpt (attr :: [OptAttr]) a Source #
Option for flags with arguments. Corresponds to option
.
Instances
data FlagOpt (attr :: [OptAttr]) a Source #
Option for flags that act like switches between a default and an active
value. Corresponds to flag
.
data ArgumentOpt (attr :: [OptAttr]) a Source #
Option for arguments (no long/short specifiers). Corresponds to
argument
.
Instances
Existential wrapper for Opt
, so that many options can be carried in
a list.
type Environment = [(String, String)] Source #
Environment variable pairs, can be retrieved with getEnvironment
.
Context to carry around, that contains environment variables and command line arguments.
HargCtx | |
|
ctxFromEnv :: Environment -> IO HargCtx Source #