optparse-applicative-dex
Synopsis
Extra functions for working with optparse-applicative
Description
optparse-applicative is a fantastic library
My usage of it has often used the same features wrapped in a parseOpts
function along with a version helper.
This package abstracts that code into a re-usable library, minimizing pasting
between projects.
In most CLI projects I almost always want:
- A header consisting of the program name and a short description
- A helper parser to provide -h, –help
- A version helper to respond to a –version option with shorter output than -h, –help
- Some additional usage info below the generated switch usage
The parseOpts’ and parseOptsWithWidth functions in this library take a parser
and arguments for header, footer and the app version as generated by cabal and
do all these things automatically.
A simple example:
{- # LANGUAGE OverloadedStrings #-}
import Options.Applicative.Dex
import Paths_your_app (version)
data Options = Options { optA :: String , optB :: Bool }
deriving Show
parser :: Parser Options
parser = Options
<$> option str ( short 'a' <> metavar "STR" <> help "The a option, a string" )
<*> switch ( short 'b' <> help "The b option, a switch")
main :: IO ()
main = do
opts <- parseOpts' parser "header-info" "footer-info" version
print opts
Getting source
Source code is available from codeberg at the optparse-applicative-dex project page.
Contact
Dino Morelli [email protected]
