Add Grammatical Framework

[johnjcamilleri]

GF, Grammatical Framework, is a programming language for multilingual grammar applications.
More information at: http://www.grammaticalframework.org/

This grammar is similar to that for Atom: https://github.com/johnjcamilleri/language-gf/
Not terribly structured, but does a good enough job.

[joshgoebel]

@johnjcamilleri

First of all, truly sorry for the long delay in anyone responding to this PR.

Thank you so much for desiring to contribute and writing a language grammar. Unfortunately, we currently are no longer accepting new languages into the core repository. The existing maintainers simply don't have time to maintain new languages (fixing bugs, dealing with issues, etc). We'd still love to host your language as a 3rd party module though - if you're willing to help maintain it.

It's easy to turn your language into a module that anyone who likes can easily integrate with Highlight.js using a single line of code:

<script src="/path/to/highlight.min.js"></script>
<!-- they'd simply add your language modules -->
<script src="/path/to/highlightjs-Grammatical.js"></script> 
<script>hljs.initHighlightingOnLoad();</script>

It's also possible for users to rebuild the highlight.js library to include specific 3rd party modules, all in a single file (vs loading a bunch of 3rd party languages one at a time).

If you'd like to become the maintainer for this language then we're happy to create a new repository in the highlightjs organization and host the repository there. That assumes you'd be open to reviewing issues and fixing bugs as they arise. You're also welcome to host the repo yourself and we'll link to it from our README.

There isn't much in the way of how to docs on this yet, but there are sample repositories and it's honestly pretty easy. We're still fleshing out an official "spec" for 3rd party modules, but even after that's done it should require minimal changes from the examples we have already. IE, if you wanted to get started now there isn't any big reason to wait.

My own robots.txt grammar repository is a great, simple example:

https://github.com/highlightjs/highlightjs-robots-txt

If you have any questions feel free to ask.

[joshgoebel]

Closing for inactivity; (also finally cleaning all these old PRs out for the new year).

As mentioned above if you're interested in becoming the maintainer of a 3rd party module, please respond [whenever you find time] and we'd be happy to help you get started.

[johnjcamilleri]

Hi! Yes I can be the maintainer for this 3rd party package. I created an empty repo here which you can link to:
https://github.com/johnjcamilleri/highlightjs-gf

[joshgoebel]

Please simply make a PR here that adds the link and language to our README. :-) Following the example you'll see of others that are already there.