getopt.net-bsd 0.4.0

getopt.net - A GNU getopt port to .net

This repository contains the code for my port of the GNU getopt functionality found on most Unix-like systems.

getopt.net is written entirely in C# and is a "cleanroom port"; although not necessary it made the project that much more fun 😃

Installation

There are several methods of installing and using getopt.net in your project.

1. Add the repository as a submodule, checkout a tag and include it as a project reference in your solution
2. Use the NuGet package manager: install-package getopt.net-bsd Note the -bsd ending which shows the license used and not system requirements! getopt.net was already in use :c

NuGet page

Features

Full support for getopt-like command-line options:

• --long-opts
• --long-opts=with_options
• --long-opts with_options
• -ShortOpTs
• -ShortsWithOpTi0n5
• -s with_opts

The standard getopt shortopt-string format is supported:

getopt.ShortOpts = "abC:dE:f:GhIjkLmnop:q:r:";

Customisation is available with long opts:

getopt.Options = new[] {
    new Option { Name = "help", ArgumentType = ArgumentType.None, Flag = Value = 'h' },
    new Option("config", ArgumentType.Required, 'c'),
    new Option("version", ArgumentType.Optional, 'v')
};

Fallback to long opts (if available!)

Most developers will have experienced this at some point when using getopt; you added an option to your long opts, but forgot it in your shortopt string. getopt.net improves this behaviour and will check the Options array to see if the option you've provided is there.

Customisable behaviour

getopt.net can be configured to not throw exceptions if that's your thing. Just set the IgnoreXXX options to true, and getopt.net will ignore bad user input!

If IgnoreInvalidOptions is enabled, entering an unknown option won't throw an exception, but instead a ! will be returned. If IgnoreMissingArguments is enabled, forgetting to add a required argument won't thow an exception either! Instead, ? will be returned.

The exceptions do contain more info, however.

Usage:

For a more detailled description of using getopt.net, please consult the Wiki.

Basic usage in C#

using getopt.net;

static void Main(string[] args) {

    var getopt = new Getopt {
        Options = new[] {
            new Option("help",    ArgumentType.None, 'h'),
            new Option("version", ArgumentType.None, 'v'),
            // or, alternatively
            new Option { Name = "config", ArgumentType.Required, 'c' }
        },
        ShortOpts = "hvc:",
        AppArgs = args, // REQUIRED
        OnlyShortOpts = false,
        // other options here
    };

    int opt = 0;
    // GetNextOpt may throw exceptions, depending on your settings!
    while ((opt = getopt.GetNextOpt(out var optArg)) != -1) {
        switch (opt) {
            case 'h':
                // print help or something
                break;
            //
        }
    }
}

Basic usage in VB.Net

Imports getopt.net

module Program

    Dim _progOptions() As [Option] = {
        New [Option]("help", ArgumentType.None, "h"c),
        New [Option]("version", ArgumentType.None, "v"c),
        New [Option]("file", ArgumentType.Required, "f"c)
    }

    Dim _progShortOptions As String = "hvf:"

    sub Main(args as string())
        Dim getopt = New GetOpt With {
            .AppArgs = args,
            .Options = _progOptions,
            .ShortOpts = _progShortOptions
        }

        Dim optChar = 0
        Dim optArg As String = Nothing
        Dim fileToRead As String = Nothing

        While optChar <> -1
            optChar = getopt.GetNextOpt(optArg)

            Select Case optChar
                Case Convert.ToInt32("h"c)
                    ' do something
                    Return
                Case Convert.ToInt32("v"c)
                    ' do something else
                    Return
                Case Convert.ToInt32("f"c)
                    ' do something with optArg
            End Select
        End While
    end sub

end module

Bugs and errors

If you encounter a bug, please add a GitHub Issue and/or create a fork of the project and create a pull request.