Attempt support for Rmd files

plugin/syntastic/registry.vim

@@ -71,6 +71,7 @@ let s:_DEFAULT_CHECKERS = {
         \ 'python':        ['python', 'flake8', 'pylint'],
         \ 'qml':           ['qmllint'],
         \ 'r':             [],
+        \ 'rmd':           [],
         \ 'racket':        ['racket'],
         \ 'rnc':           ['rnv'],
         \ 'rst':           ['rst2pseudoxml'],

syntax_checkers/rmd/lintr.vim

@@ -0,0 +1,13 @@
+if exists('g:loaded_syntastic_rmd_lintr_checker')
+    finish
+endif
+let g:loaded_syntastic_rmd_lintr_checker = 1
+
+runtime! syntax_checkers/r/lintr.vim
+
+call g:SyntasticRegistry.CreateAndRegisterChecker({
+    \ 'filetype': 'rmd',
+    \ 'name': 'lintr',
+    \ 'redirect': 'r/lintr'})
+
+" vim: set et sts=4 sw=4: