Add NoOptDefValFunc

[cornfeedhobo]

Does anyone else think it would be nice to have a function that sets the default value at runtime?

[TerraTech]

Can you show a code example of what that would look like? TIA.

[cornfeedhobo]

@TerraTech I'm loosely thinking a Flag.NoOptDefValFunc is called during Parse. The signature could be similar to parseFunc, but with the addition of a returned string that will be used to set the value.

[TerraTech]

Would it be able to return an interface type where the singular return value can be cast as needed?

perhaps something like this would work:
Flag.NoOptDefValFunc (string) {}
Flag.NoOptDefValFuncExt (interface) {}

This would offer both the simple and advanced usage cases.

I'm sure if you add this functionality, people will find ways to use it effectively in their code.