Library for commandline parsing and handling.
OptionSet
An OptionSet is the definition of all possible commandline options.
new OptionSet("-", "--")
.Add(new[] { "c" }, new[] { "command" })
.Add(new[] { "h" }, new[] { "help" })
- is the prefix and -- is the alternative prefix. In this example, following options are configured:
-c--command-h--help
Each option can have multiple parameters. Example:
-f file1.txt file2.txt -o output.txt
ParsedOptionSet
After the OptionSet.Parse method comes the handling of user provided commandline arguments.
The handler executes the Action<string[]> with the arguments after the commandline, i.e.
CommandLine: -c arg1 arg2
Output: -c executed with arg1 arg2
new OptionSet("-", "--")
.Add(new[] { "c" }, new[] { "command" })
.Add(new[] { "h" }, new[] { "help" })
.Parse(args) // From Main() method
.Handle("c", arguments =>
{
Console.WriteLine("-c executed with " + string.Join(" ", arguments));
});
ParsedOptionSet.Validate
Validate provides a callback that is invoked, if a specific validation rule is not met.
If none of the existing validation rules satisfy your requirements, use Validate.Custom to implement a custom validation rule.
new OptionSet("-", "--")
.Add(new[] { "c" }, new[] { "command" })
.Add(new[] { "h" }, new[] { "help" })
.Parse(args)
.Validate.OptionRequired("c", () =>
{
Console.WriteLine("-c is mandatory");
})
.Handle(
// ...
);
ParsedOptionSet.Assert
Assert works similar to Validate, however instead of callbacks, a CommandLineParserException is thrown.
Use assertion, if an exception is sufficient and manual error handling is not required.
new OptionSet("-", "--")
.Add(new[] { "c" }, new[] { "command" })
.Add(new[] { "h" }, new[] { "help" })
.Parse(args)
.Assert.OptionRequired("c")
.Handle(
// ...
);
- Initial release