add DCL and MMS/MMK files commonly used in OpenVMS environments

[ztmr]

Search here on GitHub:

• vms extension:mms extension:mmk gives 10,840 code results,
• vms extension:com gives 27,922 code results.

(Note that not all the files contain vms keyword...)

[pchaigno]

GitHub uses Pygments for code highlighting. Currently, it doesn't have a lexer for DCL or MMS.
This is why the Travis build is failing. It also means that this code won't be highlighted on GitHub.
You should put the lexer to Text only.

[ztmr]

MMS/MMK is similar to Makefile in some basic cases. Will it break something if we used Makefile's lexer to highlight as much as we can, and don't care if there are some cases where it won't work perfectly?

I don't know how Pygments works, whether it will break anything at all or simply generate inaccurate output if there was something what the lexer couldn't handle properly.

Is it acceptable to use Makefile's lexer? (It seems Pygments supports Makefile lexer, yet the Makefile format specified in languages.yaml does not refer it.)

[pchaigno]

I tried the Makefile lexer on MMS. It's not great: http://pygments.org/demo/707502/

[ztmr]

What does it mean that DCL "has no group?" Should I remove the OpenVMS group from languages.yaml or define it somewhere else?

[pchaigno]

I think you can remove it.
Groups are for languages like ColdFusion CFC/ColdFusion HTML which are under the group ColdFusion. The group attribute can be seen as a parent language.

[ztmr]

There was no change in Clean language, why does it fail on it? I can of course add the missing directory there but that's not point of this thread and I guess it was passing the build before...

[pchaigno]

That's because there is a conflict on the .dcl file extension. DCL and Clean both use it.
In those cases, the Bayesian classifier is used to distinguish the languages. It needs sample codes.

Support for the Clean language was added by @Jaxan in #682.
Maybe he would have some sample files for Clean...?