feat: add ignore_pattern option to filter language lines

[kanghengliu]

Refs

#216

This PR adds an option to ignore matched patterns(for example: ipython cell magics) to send to LSP.

Todo:

• match a pattern to ignore for each languages
• match multiple patterns to ignore (prefer pattern matching once instead)

[jmbuhr]

Looks good! Small nitpick would be that the docstring is slightly wrong, lua match patterns are not exactly the same es regexes. But I can fix that later.

Also a heads up: We now have so many arguments to otter activate that I will refactor it into using a table of keyword arguments, so how you call it will change. But you should get a deprecation warning then.

[kanghengliu]

docstring was an oversight whoops!

I'm also trying to expand the match_pattern for a language into a table of strings to match multiple patterns, since lua pattern matching is limited in operators. (for instance OR | does not exist)

[jmbuhr]

Maybe ^[%%!] is already sufficient? This would cover all single-character magic things.

But I'm open to a list of patterns as well for more flexibility.

[kanghengliu]

Yes indeed it is. I'm actually leaning to scraping the idea. Matching on multiple string might? slow down ls collection. Right now ^(%s*[%%!].*) works pretty well for possible magic/shell commands I can think of.

[jmbuhr]

one last thing. This will fail if there is no pattern for a language, so pattern will be nil and string.match will fail. So we should only attempt to match if pattern is not nil.