New rule: Consistent Line Endings

[paulo-ferraz-oliveira]

Name

consistent_line_endings

Brief Description

Windows and Linux/macOS systems use different line-endings in files.

It seems like a good idea not to mix these in the same codebase.

Options

force - Force a choice, values can be unix or windows.

Reasoning

While this is not necessarily a concern for the correctness of your code, you should use a consistent style throughout your codebase.

Note: If you're using a formatter, this should already be taken into account by it.

Refactoring Proposal

elvis should warn about where differences are found (if no force consider the first occurrence as "the standard") and throw an error per file alone, not one per line.

Origin (#281)

Inspired by Credo's https://hexdocs.pm/credo/Credo.Check.Consistency.LineEndings.html.