parser package:tasty

See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html for the full awk grammar.

A separate Parser data type ensures that we don't forget to skip spaces.

Command-line parser to use with flags.

Command-line flag parser that takes additional option modifiers.

Command-line option parser that takes additional option modifiers.

A command-line option parser. It has a default implementation in terms of the other methods. You may want to override it in some cases (e.g. add a short flag) and flagCLParser, mkFlagCLParser and mkOptionCLParser might come in handy. Even if you override this, you still should implement all the methods above, to allow alternative interfaces. Do not supply a default value (e.g., with the value function) here for this parser! This is because if no value was provided on the command line we may lookup the option e.g. in the environment. But if the parser always succeeds, we have no way to tell whether the user really provided the option on the command line. Similarly, do not use showDefaultWith here, as it will be ignored. Use the showDefaultValue method of IsOption instead.

Run a parser

Generate a command line parser from a list of option descriptions, alongside any related warning messages.

The command line parser for the test suite, alongside any related warnings.