Add GitLab formatter

[riyad]

Adds the HTML formatter used by GitLab. (also see gitlabhq#1)

• produces more lightweight HTML code
• allows for linking/highlighting of lines after rendering is done (see Add file line links gitlabhq/gitlabhq#1937)
• the formatter itself is a lot simpler
• makes packaging GitLab easier for distos 😉 (see Add GitLab specific formatter gitlabhq/pygments.rb#1 (comment))

[Razer6]

👍

[dzaporozhets]

👍

[avtobiff]

I suppose this should actually go to pygments bitbucket?

https://bitbucket.org/birkenfeld/pygments-main

[dosire]

@avtobiff If it is needed to submit this on bitbucket I'm willing to do so but pull requests here seem to be merged too: #92

Merging this pull request would allow GitLab to use the original and get rid of our fork. I think this would help pygments and people packaging GitLab for Fedora and Debian, see https://github.com/axilleas/gsoc/blob/master/packaging.md#gitlab-pygmentsrb

Let us know if there is anything we can do to get this resolved.

[tmm1]

Please submit this upstream.

[dosire]

@tmm1 Thanks for commenting. I've had a look at https://bitbucket.org/birkenfeld/pygments-main but they do not seems to be accepting any customer lexers or formatters, so this does not look like a feasible option. If there is anything we can do to make this PR acceptable to you please let us know. If there is nothing we can do we respect that too.

[avtobiff]

@dosire Quoting http://pygments.org/docs/plugins/

Extending The Core

If you have written a Pygments plugin that is open source, please inform us about that. There is a high chance that we’ll add it to the Pygments distribution.

[dosire]

@riyad I think you can close this since GitLab switched to highlight.js

[riyad]

done :)

[dosire]

@riyad Thanks!