If SwiftLint is built from this state using the Swift SDK, we'll get a
large self-contained Linux executable that runs without loading SourceKit.
It can do that by disabling any rule that requires SourceKit.
With `SWIFTLINT_DISABLE_SOURCEKIT` set on a normally (dynamically linked)
binary, the behavior is the same. That's different from the previously
reported more serious warnings.
The README states that a configuration like `attributes: error` is
valid to only set a different severity level for a rule (the
`attributes` rule here). This was previously only possible for rules
that were accompanied by a plain severity configuration.
I don't think this broke with the automatic parsing code generation.
For some rules it might have worked before, for others not. This change
makes it consistently working for all rules.
These macros remove some of the boilerplate involved when writing rules.
This change also adds test infrastructure for the macros used within
SwiftLint.
Danny Mösch
JP Simard