Rule idea: replace objc string methods with swift equivalents

[nicklockwood]

See: https://www.hackingwithswift.com/articles/280/one-swift-mistake-everyone-should-stop-making-today

[rgoldberg]

A general rule to replace inferior constructs (types, functions, modules, whatever) with superior constructs would be useful.

Yeah, each replacement could have its own rule, but then the rule list could explode.

You should be able to include or exclude any replacements.

The default replacements should be based on the Swift version & minimum OS versions supported by a project, because some replacements might not be useable by your code.

This would be useful for soft deprecations, deprecations that are after your minimum OS versions, etc.

It would be nice to be able to add custom replacements. e.g., I have a custom Printer struct for my CLI tool that I want to use instead of print(…) or various other ways to output to stdout or stderr.

It would be nice to be able to have an explanatory String message for replacements, and maybe a list of replacements instead of just one, in case the replacement depends on context (might only be useful for lint instead of format, unless contexts could be specified & detected). One context could be Swift version & OS version, as A might have been superseded by B, & B subsequently superseded by C, etc.