Fix #4 to allow alternative key maps again

README.markdown

@@ -32,13 +32,20 @@ manager.
 
 You can change the behavior of this plugin in your `.vimrc`:
 
-For instance, you can change the default mappings:
+For instance, the default mappings of:
 
 ```vim
 let g:wheel#map#up   = '<c-k>'
 let g:wheel#map#down = '<c-j>'
 ```
 
+...can be changed to use the Command key in MacVim:
+
+```vim
+let g:wheel#map#up   = '<D-k>'
+let g:wheel#map#down = '<D-j>'
+```
+
 If you have any existing mappings to `<c-k>` or `<c-j>`, they will be
 preserved.
 

plugin/wheel.vim

@@ -26,15 +26,19 @@ if !exists('g:wheel#map#mouse')
   let g:wheel#map#mouse = 1       " 1=natural, 0=disable, -1=reverse
 endif
 
-if !exists('g:wheel#map#up') && empty(maparg('<c-k>', 'n'))
-  let g:wheel#map#up = '<c-k>'
-else
-  let g:wheel#map#up = ''
+if !exists('g:wheel#map#up')
+  if empty(maparg('<c-k>', 'n'))
+    let g:wheel#map#up = '<c-k>'
+  else
+    let g:wheel#map#up = ''
+  en
 endif
-if !exists('g:wheel#map#down') && empty(maparg('<c-j>', 'n'))
-  let g:wheel#map#down = '<c-j>'
-else
-  let g:wheel#map#down = ''
+if !exists('g:wheel#map#down')
+  if empty(maparg('<c-j>', 'n'))
+    let g:wheel#map#down = '<c-j>'
+  else
+    let g:wheel#map#down = ''
+  en
 endif
 
 if !exists('g:wheel#map#left')