xcdiff --list could show which tags are enabled/disabled by default

[natanrolnik]

When I wanted to "filter" some tags while using xcdiff, I used xcdiff --list to print the tags. I removed 2 of them, and, to my surprise, diffing jumped from a few seconds to around 30.

I messaged @kwridan in the Tuist Slack, and he pointed me to this file: Comparators.md. Kas explained (as written in the mentioned md file) that the RESOLVED_SETTINGS tag depends on xcodebuild under the hood, and this is why this tag is disabled by default.

Ideally, listing the tags should inform the user which tags are enabled/disabled by default, so mimicking the default behavior is easier.

An example of this is the SwiftLint's rules command, which prints much more information:

For xcdiff, a table with the tags, description, and enabled by default would be even better.

[marciniwanicki]

+1, that could be very useful :)