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optparse-applicative0.18.1.0
Utilities and combinators for parsing command line options
optparse-applicative is a haskell library for parsing options on the command line, and providing a powerful applicative interface for composing them.
optparse-applicative takes care of reading and validating the arguments passed to the command line, handling and reporting errors, generating a usage line, a comprehensive help screen, and enabling context-sensitive bash, zsh, and fish completions.
See the included README for detailed instructions and examples, which is also available on github https://github.com/pcapriotti/optparse-applicative.