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The latest version of options is 1.2.1.2-2.

options

Version 1.2 revision 1 uploaded by HerbertValerioRiedel.

Package meta

Synopsis
A powerful and easy-to-use command-line option parser.
Description

The options package lets library and application developers easily work with command-line options.

The following example is a full program that can accept two options, --message and --quiet:

import Control.Applicative
import Options

data MainOptions = MainOptions
    { optMessage :: String
    , optQuiet :: Bool
    }

instance Options MainOptions where
    defineOptions = pure MainOptions
        <*> simpleOption "message" "Hello world!"
            "A message to show the user."
        <*> simpleOption "quiet" False
            "Whether to be quiet."

main :: IO ()
main = runCommand $ \opts args -> do
    if optQuiet opts
        then return ()
        else putStrLn (optMessage opts)

$ ./hello
Hello world!
$ ./hello --message='ciao mondo'
ciao mondo
$ ./hello --quiet
$

In addition, this library will automatically create documentation options such as --help and --help-all:

$ ./hello --help
Help Options:
  -h, --help
    Show option summary.
  --help-all
    Show all help options.

Application Options:
  --message :: text
    A message to show the user.
    default: "Hello world!"
  --quiet :: bool
    Whether to be quiet.
    default: false
Author
John Millikin <john@john-millikin.com>
Bug reports
n/a
Category
Console
Copyright
n/a
Homepage
https://john-millikin.com/software/haskell-options/
Maintainer
John Millikin <john@john-millikin.com>
Package URL
n/a
Stability
stable

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