From: Warren Brown <WBrown@...>
Date: 2004-08-27T05:10:09+09:00
Subject: Re: VIM syntax coloring files for Ruby [FIX]

Henry,

> I have noticed that VIM cannot properly color the
> following construct in Ruby:
>
> module MyModule
>   def my_method
>     foo = [ [ 1, 2 ], [3, 4], [5, 6] ]
>     until foo.empty?
>       foo.shift.each do |element|
>         puts element
>       end            # colored to match until
>     end              # colored to match def
>   end                # colored to match module
> end                  # not colorized
>
> In the syntax/ruby.vim file, the line after the
> comment "statement with optional *do*", the
> statements here exclude rubyDoBlocks and
> rubyCurlyBlocks from containment.  I'm not
> entirely sure why it was set up this way.  If I
> change the ruby.vim file to remove this exclusion,
> it still can't properly handle this construct:
>
> module MyModule
>   def my_method
>     foo = [ [ 1, 2 ], [3, 4], [5, 6] ]
>     until foo.empty? do
>       foo.shift.each do |element|
>         puts element
>       end
>     end
>   end
> end
>
> Does anyone familiar with vim syntax files have
> any idea how to properly correct this?

    You were on the right track with removing the "rubyDoBlocks" from
the "contains" list, but the start patterns were not set up to exclude
the optional "do".  Replace the line with this line to fix it (I've
broken the line down for sendmail, rebuild it into one line):

syn region rubyOptDoBlock
  matchgroup=rubyControl
  start="\<for\>"
  start="^\s*\(while\|until\)\>\(.*\<do\s*$\)\@!"
  start=";\s*\(while\|until\)\>\(.*\<do\s*$\)\@!"hs=s+1
  end="\<end\>"
  contains=ALLBUT,rubyExprSubst,rubyTodo,rubyCurlyBlock
  fold


    I hope this helps.

    - Warren Brown