Indentation is way off about swift.vim

[sharplet]

I have an example of some multi-line expressions that took a bit of work to format. Here's about what I would like:

let simple = Add(
               left: Number(1),
               right: Number(2)
             )

let complex = Multiply(
                left: Add(
                  left: Number(1),
                  right: Number(2)
                ),
                right: Number(3)
              )

But this is what you currently get:

let expression = Add(
                     // this level of indent is kind of ok
                     left: Number(1),
                     right: Number(2)
                     )
                 // <= but it would be nice for this to be back here

// <= indent should be reset back to the previous statement
//                   but is instead here, and we keep getting deeper!
                     let complex = Multiply(
                                            left: Add(
                                                      left: Number(1),
                                                      right: Number(2)
                                                      ),
                                                      right: Number(3)
                                                      )

Actually, here's the same thing in Ruby:

simple = Add.new(
  Number.new(1),
  Number.new(2)
)

complex = Multiply.new(
  Number.new(1),
  Add.new(
    Number.new(2),
    Number.new(3)
  )
)

Which is probably a much more sane approach:

let simple = Add(
  Number(1),
  Number(2)
)

let complex = Multiply(
  left: Number(1),
  right: Add(
    left: Number(2),
    right: Number(3)
  )
)

[keith]

@sharplet this indentation around parens was actually intentional. Rather than aligning on colons like Objective-C this is setup to align on the opening paren similar to python. The second example is definitely an issue though. I'm definitely open to suggestions about this. Xcode currently indents this like this:

let bar = Add(
  left: 5,
  right: 6
)

[keith]

@supermarin @sharplet if both of you could try the branch from this PR #30 that would be great. It entirely changes indentation. It is not currently handling the parens example any differently, but it should fix the other examples.