/var/lib/ghc/package.conf.d/optparse-applicative-0.7.0.2.conf is in libghc-optparse-applicative-dev 0.7.0.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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version: 0.7.0.2
id: optparse-applicative-0.7.0.2-7a923aa933db9a3eb15e114ad3160a6c
license: BSD3
copyright: (c) 2012 Paolo Capriotti <p.capriotti@gmail.com>
maintainer: p.capriotti@gmail.com
stability:
homepage: https://github.com/pcapriotti/optparse-applicative
package-url:
synopsis: Utilities and combinators for parsing command line options
description: Here is a simple example of an applicative option parser:
.
@
data Sample = Sample
  { hello :: String
  , quiet :: Bool }
.
sample :: Parser Sample
sample = Sample
  \<$\> strOption
  ( long \"hello\"
  \<\> metavar \"TARGET\"
  \<\> help \"Target for the greeting\" )
  \<*\> switch
  ( long \"quiet\"
  \<\> help \"Whether to be quiet\" )
@
.
The parser is built using applicative style starting from a set of basic
combinators. In this example, @hello@ is defined as an 'option' with a
@String@ argument, while @quiet@ is a boolean 'flag' (called 'switch').
.
A parser can be used like this:
.
@
greet :: Sample -> IO ()
greet (Sample h False) = putStrLn $ \"Hello, \" ++ h
greet _ = return ()
.
main :: IO ()
main = execParser opts \>\>= greet
  where
  opts = info (helper \<*\> sample)
  ( fullDesc
  \<\> progDesc \"Print a greeting for TARGET\"
  \<\> header \"hello - a test for optparse-applicative\" )
@
.
The @greet@ function is the entry point of the program, while @opts@ is a
complete description of the program, used when generating a help text. The
'helper' combinator takes any parser, and adds a @help@ option to it (which
always fails).
.
The @hello@ option in this example is mandatory (since it doesn't have a
default value), so running the program without any argument will display a
help text:
.
>hello - a test for optparse-applicative
>
>Usage: hello --hello TARGET [--quiet]
> Print a greeting for TARGET
>
>Available options:
> -h,--help Show this help text
> --hello TARGET Target for the greeting
> --quiet Whether to be quiet
.
containing a short usage summary, and a detailed list of options with
descriptions.
category: System
author: Paolo Capriotti
exposed: True
exposed-modules: Options.Applicative Options.Applicative.Arrows
Options.Applicative.BashCompletion Options.Applicative.Builder
Options.Applicative.Builder.Completer
Options.Applicative.Builder.Internal Options.Applicative.Common
Options.Applicative.Extra Options.Applicative.Help
Options.Applicative.Types Options.Applicative.Utils
hidden-modules: Options.Applicative.Internal
trusted: False
import-dirs: /usr/lib/haskell-packages/ghc/lib/optparse-applicative-0.7.0.2/ghc-7.6.3
library-dirs: /usr/lib/haskell-packages/ghc/lib/optparse-applicative-0.7.0.2/ghc-7.6.3
hs-libraries: HSoptparse-applicative-0.7.0.2
extra-libraries:
extra-ghci-libraries:
include-dirs:
includes:
depends: base-4.6.0.1-8aa5d403c45ea59dcd2c39f123e27d57
process-1.1.0.2-76e05340eb66705981411022731ca84a
transformers-0.3.0.0-ff2bb6ac67241ebb987351a3db564af0
hugs-options:
cc-options:
ld-options:
framework-dirs:
frameworks:
haddock-interfaces: /usr/lib/ghc-doc/haddock/optparse-applicative-0.7.0.2/optparse-applicative.haddock
haddock-html: /usr/share/doc/libghc-optparse-applicative-doc/html/
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