new file mode 100644
--- /dev/null
+++ b/runtime/indent/treetop.vim
@@ -0,0 +1,38 @@
+" Vim indent file
+" Language:         Treetop
+" Maintainer:       Nikolai Weibull <now@bitwi.se>
+" Latest Revision:  2011-03-14
+
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetTreetopIndent()
+setlocal indentkeys=0{,0},!^F,o,O,=end
+setlocal nosmartindent
+
+if exists("*GetTreetopIndent")
+  finish
+endif
+
+function GetTreetopIndent()
+  let pnum = prevnonblank(v:lnum - 1)
+  if pnum == 0
+    return 0
+  endif
+
+  let ind = indent(pnum)
+  let line = getline(pnum)
+
+  if line =~ '^\s*\%(grammar\|module\|rule\)\>'
+    let ind += &sw
+  endif
+
+  let line = getline(v:lnum)
+  if line =~ '^\s*end\>'
+    let ind -= &sw
+  end
+
+  retur ind
+endfunction