VIM上红宝石的代码折叠区域？

Question

I know not everyone like code folding, but as a convert to Rails and a convert to VIM, I want one of the conveniences back that I had in Visual Studio.Net. I want to be able to place arbitrary #region #endregion tags and have VIM fold them for me like everything else.

I have syntax code folding turned on and normal def..end folding works fine, I just want to augment that with #regions.

I did some googling and thought that I could do this in a ruby.vim in my syntaxes folder, but it didn't work, and I don't know enough to debug whether it was bad code that I copied over or if it just "doesn't work that way."

let b:match_words = '\s*#\s*region.*$:\s*#\s*endregion'

This is my only line in syntax/ruby.vim. In fact, the file wasn't there before I started, even though ruby highlighting is working fine. (which also throws big red flags for me - I haven't a clue where the ruby/rails syntax, unless its in the rails.vim plugin, but I can't find it there either.

Can someone lend me a thread so that I can follow it and figure this out? Thanks

UPDATE:

I found some other code snippets and tried this version instead, which almost gets me there:

syn region vimFoldRegion
  \ start="#region"
  \ end="#endregion"
  \ skip=+"\%(\\"\|[^"]\)\{-}\%("\|$\)\|'[^']\{-}'+
  \ transparent fold
  \ keepend extend
  \ containedin=ALLBUT,@vimNoFold

This lets me fold the region, but all of the code inside the region is shown like its a comment. I've tried different variations of the parameters on the syn, but I'm not grokking it.

Answer 1

Vim can fold regions based on markers if you set foldmethod=marker . The default markers are {{{ and }}} , though I'm pretty sure you could override these to be #region and #endregion . The problem is you then lose the ability to fold based on syntax. There's another Stack Overflow question dealing with combining the two fold methods [1], but the conclusion there is that it's not possible to do both simultaneously.

For what it's worth, I find that vim's syntax-based code-folding is horrendously slow for large Ruby files, so you might find yourself wanted to switch to a marker-only fold method if you run into the same problem.

[1] Foldmethod=marker and syntax at the same time?