Add RMarkdown support to ESS layer.

layers/+lang/ess/README.org

@@ -9,12 +9,15 @@
    - [[Inferior REPL process][Inferior REPL process]]
    - [[Helpers][Helpers]]
  - [[Options][Options]]
+ - [[RMarkdown support][RMarkdown support]]
 
 * Install
 To use this configuration layer, add it to your =~/.spacemacs=. You will need to
 add =ess= to the existing =dotspacemacs-configuration-layers= list in this
 file.
 
+To use Knitr follow the [[https://github.com/yihui/knitr#installation][installation instructions]] on the official github site.
+
 * Key Bindings
 
 ** Inferior REPL process
@@ -67,3 +70,8 @@ hook:
             (lambda ()
               (ess-toggle-underscore nil)))
 #+end_src
+
+* RMarkdown support
+RMarkdown files ~.Rmd~ are supported by using [[https://github.com/vspinu/polymode][polymode]]. They can be knitted to
+~.md~ files using ~M-x ess-swv-knit~ .
+

layers/+lang/ess/packages.el

@@ -17,6 +17,7 @@
     ess-R-object-popup
     ess-smart-equals
     rainbow-delimiters
+    polymode
     ))
 
 (defun ess/init-ess ()
@@ -48,7 +49,8 @@
            ("\\.[Bb][Mm][Dd]\\'" . ess-bugs-mode)
            ("\\.[Jj][Aa][Gg]\\'" . ess-jags-mode)
            ("\\.[Jj][Oo][Gg]\\'" . ess-jags-mode)
-           ("\\.[Jj][Mm][Dd]\\'" . ess-jags-mode))
+           ("\\.[Jj][Mm][Dd]\\'" . ess-jags-mode)
+           ("\\.Rmd" . poly-markdown+r-mode))
     :commands (R stata julia SAS)
     :init
     (progn
@@ -124,3 +126,10 @@
     (progn
       (add-hook 'ess-mode-hook 'ess-smart-equals-mode)
       (add-hook 'inferior-ess-mode-hook 'ess-smart-equals-mode))))
+
+(defun ess/init-polymode ()
+  (use-package poly-R
+    :defer t)
+  (use-package poly-markdown
+    :defer t)
+  )