SwiftLint should emit cursor output like compilers do

[lilyball]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Enhancement Request

When SwiftLint emits a warning or error, it would be great if it could include the line of code and a cursor like compilers do.

For example, with the following Swift compiler output:

Untitled.swift:1:4: error: binary operator '+' cannot be applied to operands of type 'Int' and 'String'
23 + "foo"
~~ ^ ~~~~~

the ~~ ^ ~~~~~ is the cursor, and it's preceded by the line of code in question.

The reason I want this output is primarily because xcpretty apparently requires it in order to actually display warnings/errors. Without this, xcpretty is completely swallowing up all SwiftLint output.

[jpsim]

This is a great idea! Especially useful too if you're using SwiftLint from the command line and fixing violations in an editor other than Xcode, which I do from time to time.

If you have some time, this would be a fantastic contribution.

A good place to start would be to take a look at a similar function we use in our tests to render violations inline with the content. It's quite simple, it's called render(violations:in:) and outputs violations in this format:

func abc()↓{
          ^ warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
}

[lilyball]

I'd still really love to see this, though I don't have time to work on it myself.

[stale]

This issue has been automatically marked as stale because it has not had any recent activity. Please comment to prevent this issue from being closed. Thank you for your contributions!