Command line option parsers
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There are several packages that want to simplify the task of writing command line parsers. Unfortunately, they are distributed across several Hackage categories. Here is an attempt to list them:
Package | Multi-mode | Extensions | Remark |
---|---|---|---|
cmdargs | X | TemplateHaskell, SYB generics, ViewPatterns, ... | unsafePerformIO
|
cmdlib | X | SYB generics | based on GetOpt |
cmdtheline | X | FlexibleInstances (although unnecessary) | shows help as man-page |
console-program | X | TemplateHaskell | configure options via files |
getflag | - | Haskell98 | like GetOpt but with Unix/Plan 9 option syntax |
hflags | - | TemplateHaskell | inspired by Google's gflags, provides parsed options in top-level variables, allow to set options via environment variables |
multiarg | - | CPP | long options with multiple arguments |
options | X | TemplateHaskell | |
optparse-applicative | X | GADT | Applicative Functor |
parseargs | - | FlexibleInstances | supports a fixed set of argument types: Int, Integer, Float, Double, String, FileOpener
|
ReadArgs | |||
simpleargs | |||
yaop |
The column for required Haskell extensions gives an idea of how easy it is to port the package to compilers other than GHC.