Add rules around newlines

[Noobish1]

So I hate redundant newlines in our codebase. We've hired some junior developers recently and they have a habit of adding redundant newlines everywhere and we'd love to see warnings/errors when they do this.

a few places they do it:

• In between functions (we normally have empty line between them)
• in function bodies (we normally have one empty line between chunks of related code)
• at the bottom of classes/structs (we normally have no empty lines at the bottom of classes/structs)

Would it be possible to add rules for the above cases?

[brentleyjones]

In our style guide we have a section that basically reads as:

Grouping

• Spacing:
  • Leave a single blank line at the start of a type declaration or extension.
  • Leave a single blank line before and after // MARK: or other grouping related comments.
  • Otherwise don't leave whitespace at the beginning or end of a scope.
• Make liberal use of single blank lines to divide code into logical chunks. Some pre-defined logical chunks are:
  • Functions
  • Commented items

This is similar to @Noobish1's rules. I would love to be able to enforce these via SwiftLint.

[jpsim]

This all sounds great to me. I don't think anyone has claimed this ticket as something they were building yet, so anyone should feel free to get started on this!

[brentleyjones]

Btw, #305 is a duplicate of this now.

[masters3d]

Do we need a new rule or could TrailingWhitespaceRule be modified to also complain about pure newlines?

[masters3d]

Never mind, this would be confusing with the TrailingNewlineRule.