Fix Prolog comment character

[dariusf]

A number of mature Prolog implementations (SICStus, GNU, SWI) use % as the line comment character. GitHub also highlights it that way.

% percent
# hash

[gfx]

Sounds good. Thanks for your contributions.

[beardhatcode]

Is there a reason why this is not yet merged?
Change is correct and works for me.

[dblessing]

Whoops. I didn't see this before I merged #898. That PR added % but did not remove #. @beardhatcode if you want you can rebase your PR and remove the now unnecessary # rule. The other PR author left it as they weren't sure if it was necessary or not. If you know it's not necessary then I'm happy to merge a PR for that.

[dariusf]

Not changing how #! lines are highlighted seemed like a good idea, so I made the regex more specific instead of removing it.

[pyrmont]

Thanks @jneen :)

@dariusf Using the C lexer as an example, this code works for me:

start { push :bol }

state :bol do
  rule /#.*/, Comment::Single
  rule(//) { pop! }
end

I then removed the rule /#.*/, Comment::Single line from the :basic state and it's working so far.

[dariusf]

Made the suggested changes. Thanks, everyone.

No longer required.

[pyrmont]

Sorry for the delay, @dariusf. I missed your fix. It took a while but thanks for helping to improve Rouge!