Ability to run _only_ selected rules

[ross-whatnot]

As we've been stretching our use cases for dbt-score, I've found a few circumstances where I want to be able to run rules in a more targeted way for certain situations. For a concrete example, we have a couple of checks for "are you ref'ing deprecated models", where we want the behavior to be roughly:

• a non-required CI check fails if you have modified files that ref deprecated models
• a required CI check fails if you have added files that ref deprecated models

Currently, I've got a rule for each of these in a dedicated namespace, and execute dbt-score to evaluate that namespace and exclude the other rule (so, the 'modified files' check is run to disable the 'added files' check, and vice versa). But it'd be easier and more flexible in a lot of ways to be able to run dbt-score and have it run just the specific rule(s) I specify at runtime.

My first thought here would be that a behavior could be, roughly:

• add a --selected-rule flag that takes a list of rules to run, similar to --disabled-rule
• if that's present, rules in the --selected-rule are run, ignoring any normal configuration that would disable them
• --selected-rule and --disabled-rule are mutually exclusive, you can't supply both in a given CLI call

That would allow one to have "special" rules that aren't run during a basic CLI call, but call those rules explicitly and flexibly when needed.

I'm happy to take a crack at this, if we can get alignment on the behavior!

[jochemvandooren]

I like this idea! Your use-case is quite specific I think, but I see a great use-case for rule development. When writing a new rule, sometimes you are just interested in the result of that single rule.

• I agree that selected-rule and disabled-rule should be mutually exclusive.

if that's present, rules in the --selected-rule are run, ignoring any normal configuration that would disable them

Could you elaborate on what normal configuration you mean here?

[ross-whatnot]

Could you elaborate on what normal configuration you mean here?

Basically, just ignore any TOML-level configuration that would disable that rule; if a rule is selected with selected-rule, it gets run.

And yes, I'm doing something fairly specific with this :D But hopefully it's a generally useful behavior. I'll put in a PR when I get a chance!