Vim indenting file for Treetop (Ruby parser)

Question

Has anyone seen a vim indent file for treetop, the Ruby parser/generator? I've found a vim syntax highlighting file, but haven't seen one for indentation.

Answer 1

I'm not sure if there's a straight ruby implementation, but the vim rails plugin handles indentation quite well.

You could always just edit this so that it supports ruby files that aren't within a rails project. Check it out.

Answer 2

I searched for this a while ago for Vim or Emacs and couldn't find anything so I started writing my own mode for Emacs. It never got to anything since I pretty much stopped using TT but if my memory doesn't fail you only have to parse something like:

grammar Name
  includes # something like "include Something"

  rule rule_name
    tokens_or_rules {
      inner_method {
      }
    }
    <MyModule>
  end
end

Which might not be too hard after reading this.

PS: Keep in mind that this grammar is really similar to the one used by RSpec which is natural Ruby so maybe you could get some help by reading that.

Answer 3

It seems like it's fairly easy - I just create a file

~/.vim/indent/treetop.vim

and make its sole contents

runtime! indent/ruby.vim

and it seems to then support all I need. I think it just wasn't loading Ruby's indentation file!

Answer 4

I copied the one from this guy: http://code.google.com/p/dot-files/source/browse/trunk/.vim/syntax/treetop.vim?spec=svn149&r=149

Works beautifully.