* refactor: extract shared code for linting if-else chains
The rules "early-return", "indent-error-flow" and
"superfluous-else" have a similar structure. This
moves the common logic for classifying if-else chains
to a common package.
A few side benefits:
- "early-return" now handles os.Exit/log.Panicf/etc
- "superfluous-else" now handles (builtin) panic
- "superfluous-else" and "indent-error-flow" now handle if/else
chains with 2+ "if" branches
* internal/ifelse: style fixes, renames, spelling
* Allow a whitelist for the context parameter check
This allows users to configure a set of types that may appear before
`context.Context`.
Notably, I think this rule is useful for allowing the `*testing.T` type
to come before `context.Context`, though there may be other uses (such
as putting a tracer before it, etc).
See #605 for a little more context on this.
Fixes#605
* Save a level of indentation in context-as-arg validation
We can unindent if we make the above check more specific
* refactoring taking into account chavacava's review
Co-authored-by: chavacava <salvadorcavadini+github@gmail.com>
