Add rule to detect duplicate code

[steve21124]

since swiftlint use sourcekit, do you think it is possible to detect duplicate code through result from sourcekit?

[jpsim]

Yes, it'd be possible to some extent, but nothing is currently implemented. I'll keep this open as a rule request. Here's my comment from the duplicate issue you just opened up on SourceKitten (jpsim/SourceKitten#216):

You can find duplicate code just by doing regular text parsing. You don't need SourceKitten for that.

If you want to build a system that detects similar patterns, with heuristics accounting small variations in structure and naming, you could certainly do that using text parsing augmented by SourceKitten's Structure construct.

But SourceKitten doesn't ship a CLI command or API that will "show all duplicated code".

[masters3d]

@steve21124 probably better to use something like https://github.com/kucherenko/jscpd

[jpsim]

Doesn't look like jscpd supports Swift.

[kucherenko]

Swift language support added to jscpd
jscpd@0.6.4

[jpsim]

Sweet, thanks @kucherenko for the quick turnaround on that!