Separate Template for "Incorrect Usage"

[dufferzafar]

Currently, when a user passes an unidentified argument, like app --badargument, the ShowAppHelp function is called, which uses the AppHelpTemplate.

This behavior is fine, but, I think showing the entire help might not always be nice idea. Like git only shows the common usage when a bad argument is passed.

So, it'll be better if there were a separate IncorrectUsageTemplate which will offer greater flexibility.

[codegangsta]

Yeah that may be a good idea. Anybody else down for this?

[kdar]

I think this is good. +1

[meatballhat]

I believe this is now covered by App.OnUsageError. Please yell if you disagree!