¤ argKey, argFlag, et al

Environment

Types

argKey :: String -> String -> String
argFlag :: String -> Bool -> Bool
argReadKey :: (Read p, Show p) => String -> p -> p
args :: [String]
options :: [(String, String)]

Description

These functions provide convenient access to command line arguments and environment variables.

Bugs

Documentation incomplete.

These functions date back to the early days when Fudgets were implemented in Lazy ML, which had functions like getenv :: String->String and readfile :: FilePath->String. While they don't have any side effects, they are not really pure functions either, since their results depend not only on the arguments, but also on the state of the world outside the running program, so such functions are normally not available in Haskell.