cli: Allow for a single commit in the --commits cmd-line param

[carlescufi]

In order to avoid applications needing to select between --commit and --commits based on the number of commits, allow for providing a single commit with --commits in the format:

$ gitlint --commits <sha>,

The trailing comma ensures that gitlint knows this is a commit list and not a refspec.

Signed-off-by: Carles Cufi carles.cufi@nordicsemi.no

[jorisroovers]

Thanks for the PR - makes sense 👍

Still needs docs and a unit test (I can take care of that for you if you want).

[carlescufi]

Thanks for the PR - makes sense 👍

Still needs docs and a unit test (I can take care of that for you if you want).

Let me give it a go. If I get stuck I will let you know. Thanks!

[carlescufi]

@jorisroovers done, please take another look. Thanks!

[jorisroovers]

Tested locally, works well!

Merging 👍

[carlescufi]

Tested locally, works well!

Merging 👍

Thanks for the speedy review and merging!