Updated runtime files.

runtime/indent/context.vim

@@ -0,0 +1,36 @@
+" ConTeXt indent file
+" Language: ConTeXt typesetting engine
+" Maintainer: Nicola Vitacolonna <nvitacolonna@gmail.com>
+" Last Change:  2016 Oct 15
+
+if exists("b:did_indent")
+  finish
+endif
+
+if !get(b:, 'context_metapost', get(g:, 'context_metapost', 1))
+  finish
+endif
+
+" Load MetaPost indentation script
+runtime! indent/mp.vim
+
+let s:keepcpo= &cpo
+set cpo&vim
+
+setlocal indentexpr=GetConTeXtIndent()
+
+let b:undo_indent = "setl indentexpr<"
+
+function! GetConTeXtIndent()
+  " Use MetaPost rules inside MetaPost graphic environments
+  if len(synstack(v:lnum, 1)) > 0 &&
+        \ synIDattr(synstack(v:lnum, 1)[0], "name") ==# 'contextMPGraphic'
+    return GetMetaPostIndent()
+  endif
+  return -1
+endfunc
+
+let &cpo = s:keepcpo
+unlet s:keepcpo
+
+" vim:sw=2