format_result should have only 1 parameter

[miaout17]

It's a little complex to explain the issue....
In my mind, I think the problem is:

In "ripl way" (hooking methods by including modules)
The parameter number of basis method (defined in ripl core) should not be added.

For example, if I am using hirb with ripl-rc
Hirb will render some data types to table format.
If it can't, it will invoke super and let parent class(module) to do the work.

Thus, the calling chain would be:

• Ripl::Hirb::format_result(result)
• Ripl::RC::Color.format_result(result, display = result.inspect)

However, if we pass 2 parameters to format_result, Ripl::Hirb::format_result will raise ArgumentError.
This will also occurs if we have other format_result hooks before ripl-rc.

The solution might be using a auxiliary method.
I proposed a fix, feel free to improve it.

[godfat]

Thank you!

I understand that changing arity is really a bad idea,
but since it's working, so I didn't really doubt it very much.

I guess the problem here is, I didn't use any plugin other
than ripl-rc, so I didn't know it was causing problems.

I bet it must have other bugs when mixing plugins...
or not enabling all of the plugins in ripl-rc.

It would be excellent if someone has other use cases than me.

Thanks again.