Apply directives to comment lines.

[skhal]

Google keep-sorted (https://github.com/google/keep-sorted) helps to keep YAML lines sorted between two marker comments, which is helpful in Ansible playbooks, pre-commit configs, etc.:

$ cat -n /tmp/example.yml
1  ---
2  example:
3    # keep-sorted start
4    - name: a
5    - name: c
6      b: bar
7    # keep-sorted end

Yamllint reports "rule:comments-indentation" violation on line 7:

$ yamllint -v
yamllint 1.38.0

$ yamllint /tmp/example.yml
/tmp/example.yml
  7:3       warning  comment not indented like content  (comments-indentation)

A directive to skip the next line does not work either:

$ cat -n /tmp/example_nolint.yml
1  ---
2  example:
3    # keep-sorted start
4    - name: one
5    - name: two
6      b: bar
7    # yamllint disable-line rule:comments-indentation
8    # keep-sorted end

$ yamllint /tmp/example_nolint.yml
/tmp/example_nolint.yml
  7:3       warning  comment not indented like content  (comments-indentation)

Note that the violation is for the directive itself because Yamllint does not apply directives to comments.

This change makes Yamllint apply the "next line directive" to comments.