trying out the vim-ruby gem:

sudo gem install vim-ruby
vim-ruby-install.rb

compiler/eruby.vim

@@ -0,0 +1,41 @@
+" Vim compiler file
+" Language:		eRuby
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Info:			$Id: eruby.vim,v 1.6 2006/04/15 12:01:18 dkearns Exp $
+" URL:			http://vim-ruby.rubyforge.org
+" Anon CVS:		See above site
+" Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "eruby"
+
+if exists(":CompilerSet") != 2		" older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+let s:cpo_save = &cpo
+set cpo-=C
+
+if exists("eruby_compiler") && eruby_compiler == "eruby"
+  CompilerSet makeprg=eruby
+else
+  CompilerSet makeprg=erb
+endif
+
+CompilerSet errorformat=
+    \eruby:\ %f:%l:%m,
+    \%+E%f:%l:\ parse\ error,
+    \%W%f:%l:\ warning:\ %m,
+    \%E%f:%l:in\ %*[^:]:\ %m,
+    \%E%f:%l:\ %m,
+    \%-C%\tfrom\ %f:%l:in\ %.%#,
+    \%-Z%\tfrom\ %f:%l,
+    \%-Z%p^,
+    \%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+" vim: nowrap sw=2 sts=2 ts=8 ff=unix:

compiler/ruby.vim

@@ -0,0 +1,68 @@
+" Vim compiler file
+" Language:		Ruby
+" Function:		Syntax check and/or error reporting
+" Maintainer:		Tim Hammerquist <timh at rubyforge.org>
+" Info:			$Id: ruby.vim,v 1.12 2006/04/15 12:01:18 dkearns Exp $
+" URL:			http://vim-ruby.rubyforge.org
+" Anon CVS:		See above site
+" Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
+" ----------------------------------------------------------------------------
+"
+" Changelog:
+" 0.2:	script saves and restores 'cpoptions' value to prevent problems with
+"	line continuations
+" 0.1:	initial release
+"
+" Contributors:
+"   Hugh Sasse <hgs@dmu.ac.uk>
+"   Doug Kearns <djkea2@gus.gscit.monash.edu.au>
+"
+" Todo:
+"   match error type %m
+"
+" Comments:
+"   I know this file isn't perfect.  If you have any questions, suggestions,
+"   patches, etc., please don't hesitate to let me know.
+"
+"   This is my first experience with 'errorformat' and compiler plugins and
+"   I welcome any input from more experienced (or clearer-thinking)
+"   individuals.
+" ----------------------------------------------------------------------------
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "ruby"
+
+if exists(":CompilerSet") != 2		" older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+let s:cpo_save = &cpo
+set cpo-=C
+
+" default settings runs script normally
+" add '-c' switch to run syntax check only:
+"
+"   CompilerSet makeprg=ruby\ -wc\ $*
+"
+" or add '-c' at :make command line:
+"
+"   :make -c %<CR>
+"
+CompilerSet makeprg=ruby\ -w\ $*
+
+CompilerSet errorformat=
+    \%+E%f:%l:\ parse\ error,
+    \%W%f:%l:\ warning:\ %m,
+    \%E%f:%l:in\ %*[^:]:\ %m,
+    \%E%f:%l:\ %m,
+    \%-C%\tfrom\ %f:%l:in\ %.%#,
+    \%-Z%\tfrom\ %f:%l,
+    \%-Z%p^,
+    \%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+" vim: nowrap sw=2 sts=2 ts=8 ff=unix:

compiler/rubyunit.vim

@@ -0,0 +1,35 @@
+" Vim compiler file
+" Language:		Test::Unit - Ruby Unit Testing Framework
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Info:			$Id: rubyunit.vim,v 1.11 2006/04/15 12:01:18 dkearns Exp $
+" URL:			http://vim-ruby.rubyforge.org
+" Anon CVS:		See above site
+" Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "rubyunit"
+
+if exists(":CompilerSet") != 2		" older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+let s:cpo_save = &cpo
+set cpo-=C
+
+CompilerSet makeprg=testrb
+
+CompilerSet errorformat=\%W\ %\\+%\\d%\\+)\ Failure:,
+			\%C%m\ [%f:%l]:,
+			\%E\ %\\+%\\d%\\+)\ Error:,
+			\%C%m:,
+			\%C\ \ \ \ %f:%l:%.%#,
+			\%C%m,
+			\%Z\ %#,
+			\%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+" vim: nowrap sw=2 sts=2 ts=8 ff=unix:

ftdetect/ruby.vim

@@ -0,0 +1,14 @@
+" Ruby
+au BufNewFile,BufRead *.rb,*.rbw,*.gem,*.gemspec	set filetype=ruby
+
+" Ruby on Rails
+au BufNewFile,BufRead *.builder,*.rxml,*.rjs		set filetype=ruby
+
+" Rakefile
+au BufNewFile,BufRead [rR]akefile,*.rake		set filetype=ruby
+
+" Rantfile
+au BufNewFile,BufRead [rR]antfile,*.rant		set filetype=ruby
+
+" eRuby
+au BufNewFile,BufRead *.erb,*.rhtml			set filetype=eruby

ftplugin/eruby.vim

@@ -0,0 +1,101 @@
+" Vim filetype plugin
+" Language:		eRuby
+" Maintainer:		Tim Pope <vimNOSPAM@tpope.info>
+" Info:			$Id: eruby.vim,v 1.10 2007/05/06 16:05:40 tpope Exp $
+" URL:			http://vim-ruby.rubyforge.org
+" Anon CVS:		See above site
+" Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
+
+" Only do this when not done yet for this buffer
+if exists("b:did_ftplugin")
+  finish
+endif
+
+let s:save_cpo = &cpo
+set cpo-=C
+
+" Define some defaults in case the included ftplugins don't set them.
+let s:undo_ftplugin = ""
+let s:browsefilter = "All Files (*.*)\t*.*\n"
+let s:match_words = ""
+
+if !exists("g:eruby_default_subtype")
+  let g:eruby_default_subtype = "html"
+endif
+
+if !exists("b:eruby_subtype")
+  let s:lines = getline(1)."\n".getline(2)."\n".getline(3)."\n".getline(4)."\n".getline(5)."\n".getline("$")
+  let b:eruby_subtype = matchstr(s:lines,'eruby_subtype=\zs\w\+')
+  if b:eruby_subtype == ''
+    let b:eruby_subtype = matchstr(substitute(expand("%:t"),'\c\%(\.erb\)\+$','',''),'\.\zs\w\+$')
+  endif
+  if b:eruby_subtype == 'rhtml'
+    let b:eruby_subtype = 'html'
+  elseif b:eruby_subtype == 'rb'
+    let b:eruby_subtype = 'ruby'
+  elseif b:eruby_subtype == 'yml'
+    let b:eruby_subtype = 'yaml'
+  elseif b:eruby_subtype == 'js'
+    let b:eruby_subtype = 'javascript'
+  elseif b:eruby_subtype == 'txt'
+    " Conventional; not a real file type
+    let b:eruby_subtype = 'text'
+  elseif b:eruby_subtype == ''
+    let b:eruby_subtype = g:eruby_default_subtype
+  endif
+endif
+
+if exists("b:eruby_subtype") && b:eruby_subtype != ''
+  exe "runtime! ftplugin/".b:eruby_subtype.".vim ftplugin/".b:eruby_subtype."_*.vim ftplugin/".b:eruby_subtype."/*.vim"
+else
+  runtime! ftplugin/html.vim ftplugin/html_*.vim ftplugin/html/*.vim
+endif
+unlet! b:did_ftplugin
+
+" Override our defaults if these were set by an included ftplugin.
+if exists("b:undo_ftplugin")
+  let s:undo_ftplugin = b:undo_ftplugin
+  unlet b:undo_ftplugin
+endif
+if exists("b:browsefilter")
+  let s:browsefilter = b:browsefilter
+  unlet b:browsefilter
+endif
+if exists("b:match_words")
+  let s:match_words = b:match_words
+  unlet b:match_words
+endif
+
+runtime! ftplugin/ruby.vim ftplugin/ruby_*.vim ftplugin/ruby/*.vim
+let b:did_ftplugin = 1
+
+" Combine the new set of values with those previously included.
+if exists("b:undo_ftplugin")
+  let s:undo_ftplugin = b:undo_ftplugin . " | " . s:undo_ftplugin
+endif
+if exists ("b:browsefilter")
+  let s:browsefilter = substitute(b:browsefilter,'\cAll Files (\*\.\*)\t\*\.\*\n','','') . s:browsefilter
+endif
+if exists("b:match_words")
+  let s:match_words = b:match_words . ',' . s:match_words
+endif
+
+" Change the browse dialog on Win32 to show mainly eRuby-related files
+if has("gui_win32")
+  let b:browsefilter="eRuby Files (*.erb, *.rhtml)\t*.erb;*.rhtml\n" . s:browsefilter
+endif
+
+" Load the combined list of match_words for matchit.vim
+if exists("loaded_matchit")
+  let b:match_words = s:match_words
+endif
+
+" TODO: comments=
+setlocal commentstring=<%#%s%>
+
+let b:undo_ftplugin = "setl cms< "
+      \ " | unlet! b:browsefilter b:match_words | " . s:undo_ftplugin
+
+let &cpo = s:save_cpo
+
+" vim: nowrap sw=2 sts=2 ts=8 ff=unix: