Add version argument capability about fluent-command-line-parser

[brecko]

Thanks. I did a little bit of a hybrid of what you specified. I will still contend that some more gracefull way of handling this would be nice for when there are required parameters such as a check to see if a parameter exists or not such as p.Options.Exists(['v','version', 'foobar'...]).

[siywilliams]

Hi @brecko

I currently use

fclp.Setup<bool>('v', "version").Callback(b => PrintVersion());

or

bool showVersion;

fclp.Setup<bool>('v', "version").Callback(b => showVersion = b).SetDefault(false);

if(showVersion){
   PrintVersion()
}

[brecko]

Thanks. I will give it a try. I did everything other than setdefault(false). Not sure it matters, but all my parameters are required so when I perform the parse, it shows I have errors. This is when only -v or --version was used.

UPDATE:
I have the following:
var p = new FluentCommandLineParser {IsCaseSensitive = false};
p.Setup(arg => arg.CalculatorFile)
.As(ApplicationArguments.CalculatorSwitchShort, ApplicationArguments.CalculatorSwitchLong)
.WithDescription("Some description")
.Required();
...
about 5-6 more that are required. help | h | ? is not required

...
var result = p.Parse(args);
if (result.HelpCalled)
return;
if (result.HasErrors)
{
Console.WriteLine(result.ErrorText);
Console.WriteLine("For command line argument help: [-? | -h | --help]\n\n");
Console.WriteLine("Exiting analysis.");
return;
}

So I cannot use either of your suggestions for .
Something that just came to mind is I might need to do yours, test it for version and if so, display it and exit else use what I have now for the rest. But it would be nice, if I didn't have to...
Thanks!!

[siywilliams]

SetDefaultensures that a value is set for that option even if one isn't provided, it just makes it more explicit.

Yeah the result contains errors because your other options have been setup as Required().** Not much that can be done about that unfortunately, however I would check help, then version, then for any errors such as:

var p = new FluentCommandLineParser { IsCaseSensitive = false };
p.Setup(arg => arg.ShowVersion)
 .As('v', "version")
 .SetDefault(false);

var result = p.Parse(args);
if (result.HelpCalled) {
   // show help
}
else if(p.Object.ShowVersion) {
   // show version
}
else if (result.HasErrors) {
   // show errors
}