Add hostname white list to skip adding rel attributes

[nickjj]

Hi,

The behavior I'm seeking is:

• All external links open in a new window
• All external links get noopner and noreferrer
• An optional white list of hostnames can be added which don't get the rel nofollow attributes (even if set)

Use case:

I'm going to be adding a site where 95% of the links are external and 5% of the links are trusted so I don't want to set nofollow.

Potential API for usage:

target-blank:
  rel_nofollow_skip_domains: ["example.com", "github.com"]

Example link output:

<a href="http://example.com" target="_blank">Example</a>
<a href="https://example.com" target="_blank">Example</a>
<a href="https://www.example.com" target="_blank">Example</a>
<a href="http://foo.github.com" target="_blank">GitHub</a>
<a href="https://www.github.com" target="_blank">GitHub</a>
<a href="https://foo.bar.github.com" target="_blank">GitHub</a>
<a href="https://somewhere.com" target="_blank" rel="nofollow">Somewhere</a>

[kenchan0130]

@nickjj
Thank you for your contribution.
Looks good.

Since the head family seems to have started maintenance, I'm proposing whether it can be merged there.
keithmifsud#35 (comment)

Sorry for stopping the discussion.

[kenchan0130]

Hi @nickjj,
Since the maintainer of the head family has returned, I will close and move this issue.

[nickjj]

Thanks. In the end I found https://github.com/d-ogarkov/jekyll-extlinks which did the trick.