@okonomiyaki3000 Thanks! I would really appreciate when this get into next version.

As emmet have a build-in list for abbreviations in flavours of html, css, etc it could be extended too (with an own snippets.json) which could be used by joomla to provide snippets for common tasks,
like php snippets for expanding j3:jdimt to <jdoc:include type="modules" name="title" /> as an example

This could extended to an internal set of abbreviations and snippets with the set of current function calls, includes, etc. (pattern) to support developers, template designers, advanced users as help to create or modify their modules, components, templates. (Snippets anyone?)

To give this ability, there should be an ajax function to load the snippet.js into emmet.
A short note how to do this i found here: http://stackoverflow.com/questions/25215959/how-to-customize-emmet-snippets-json-for-codemirror

Interessting the answer from Sergey Chikuyonok, the developer of Emmet.
Maybe he have already those Ajax-funktions which could be used...

That would give the user of joomla a chance to use their own snippets within CM and Emmet.

This may need a few changes once #6150 is merged.

I had a better idea about how to do some things over at #5863 and that will affect this PR too. Basically, if that one is merged, Emmet can be done as a separate plugin which means that it can either be merged and distributed with Joomla or, if there's not enough interest in that, it can be packaged separately and installed only by people who are interested in it.

So, please don't merge this yet. Let's get #5863 merged first and then decide what to do about this.

@okonomiyaki3000 Now that #5863 has been merged, what to do with this?

#5863 changed quite a bit by the time it was merged from when I first proposed it. This PR is not really still relevant because I gave the CodeMirror plugin a plugin group of its own. So an addon like this should really be a separate plugin now. I'm going to close this and remake it that way in the near future. I probably won't propose it as a PR for Joomla though. It can just be a plugin that people can install only if they want to.