Format/prettify xml

[tfnico]

I expected xmledit to contain some shortcut for formatting or prettifying XML, but couldn't find any such feature.

So I just quickly copied in one I found in http://vim.wikia.com/wiki/Pretty-formatting_XML

Note that I've never done any vimscript before, this is just copying stuff in 🎱

[sukima]

This is a nice feature. Where do we find xmllint? It is an external dependency.

Here is some ideas to improve this feature:

• Really good documentation for others who want to use this feature.
• Allow this feature to be enabled via a g:xmledit_enable_xmllint and / or g:xmledit_xmllint_path
• Maybe a nice error message if xmllint isn;t installed on the system

[tfnico]

Perhaps we could fall back to doing some rudimentary regexp formatting if xmllint is not available?

[sukima]

Regexp == Red Flags.

I think xmllint is the correct way to go. I'm assuming it does a lot more than just a few regexp replacements. Anyway, it is not unreasonable for a plugin like this to support an external program.

Maybe, instead, a simple check: IF g:xmledit_xmllint_path is defined OR xmllint is in the path THEN enable the mappings ELSE disable the mapping