Update ruby syntax

ftplugin/ruby.vim

@@ -138,7 +138,7 @@ if exists('s:ruby_paths') && stridx(&l:tags, join(map(copy(s:ruby_paths),'v:val.
   let &l:tags = &tags . ',' . join(map(copy(s:ruby_paths),'v:val."/tags"'),',')
 endif
 
-if has("gui_win32") && !exists("b:browsefilter")
+if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
   let b:browsefilter = "Ruby Source Files (*.rb)\t*.rb\n" .
                      \ "All Files (*.*)\t*.*\n"
 endif

syntax/ruby.vim

@@ -82,7 +82,7 @@ syn cluster rubyExtendedStringSpecial contains=@rubyStringSpecial,rubyNestedPare
 syn cluster rubyRegexpSpecial	      contains=rubyInterpolation,rubyNoInterpolation,rubyStringEscape,rubyRegexpSpecial,rubyRegexpEscape,rubyRegexpBrackets,rubyRegexpCharClass,rubyRegexpDot,rubyRegexpQuantifier,rubyRegexpAnchor,rubyRegexpParens,rubyRegexpComment
 
 " Numbers and ASCII Codes
-syn match rubyASCIICode	"\%(\w\|[]})\"'/]\)\@<!\%(?\%(\\M-\\C-\|\\C-\\M-\|\\M-\\c\|\\c\\M-\|\\c\|\\C-\|\\M-\)\=\%(\\\o\{1,3}\|\\x\x\{1,2}\|\\\=\S\)\)"
+syn match rubyASCIICode	"\%(\w\|[]})\"'/\.]\)\@<!\%(?\%(\\M-\\C-\|\\C-\\M-\|\\M-\\c\|\\c\\M-\|\\c\|\\C-\|\\M-\)\=\%(\\\o\{1,3}\|\\x\x\{1,2}\|\\\=\S\)\)"
 syn match rubyInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<0[xX]\x\+\%(_\x\+\)*\>"								display
 syn match rubyInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<\%(0[dD]\)\=\%(0\|[1-9]\d*\%(_\d\+\)*\)\>"						display
 syn match rubyInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<0[oO]\=\o\+\%(_\o\+\)*\>"								display
@@ -131,14 +131,12 @@ syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r<"				 end=">[iomx
 syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r\["				 end="\][iomxneus]*"  skip="\\\\\|\\\]"	 contains=@rubyRegexpSpecial fold
 syn region rubyRegexp matchgroup=rubyRegexpDelimiter start="%r("				 end=")[iomxneus]*"   skip="\\\\\|\\)"	 contains=@rubyRegexpSpecial fold
 
-" Normal String and Shell Command Output
-if exists('ruby_spellcheck_strings')
-  syn region rubyString matchgroup=rubyStringDelimiter start="\"" end="\"" skip="\\\\\|\\\"" contains=@rubyStringSpecial,@Spell fold
-  syn region rubyString matchgroup=rubyStringDelimiter start="'"  end="'"  skip="\\\\\|\\'"  contains=rubyQuoteEscape,@Spell    fold
-else
-  syn region rubyString matchgroup=rubyStringDelimiter start="\"" end="\"" skip="\\\\\|\\\"" contains=@rubyStringSpecial fold
-  syn region rubyString matchgroup=rubyStringDelimiter start="'"  end="'"  skip="\\\\\|\\'"  contains=rubyQuoteEscape    fold
-endif
+" Normal String
+let s:spell_cluster = exists('ruby_spellcheck_strings') ? ',@Spell' : ''
+exe 'syn region rubyString matchgroup=rubyStringDelimiter start="\"" end="\"" skip="\\\\\|\\\"" fold contains=@rubyStringSpecial' . s:spell_cluster
+exe 'syn region rubyString matchgroup=rubyStringDelimiter start="''" end="''" skip="\\\\\|\\''" fold contains=rubyQuoteEscape'    . s:spell_cluster
+
+" Shell Command Output
 syn region rubyString matchgroup=rubyStringDelimiter start="`" end="`" skip="\\\\\|\\`" contains=@rubyStringSpecial fold
 
 " Generalized Single Quoted String, Symbol and Array of Strings