Add vim function to edit current color scheme

vimrc

@@ -25,7 +25,7 @@ filetype off
 " Store the current system name so that we can conditionally set configs for
 " different platforms
 let s:uname = system("echo -n \"$(uname)\"")
-let s:vim_dir = $HOME . "/.vim"
+let g:vim_dir = $HOME . "/.vim"
 let mapleader=","
 
 function! IsWindows()
@@ -1041,6 +1041,18 @@ else
 endif
 
 
+" Open the current color scheme for editing.
+function! EditColorScheme()
+    let l:path = g:vim_dir . '/colors/' . s:theme . '.vim'
+    if filereadable(l:path)
+        execute 'vsplit ' . l:path
+    else
+        call PrintError("Failed to open " . l:path . " for editing.")
+    endif
+endfunction
+
+command -nargs=0 EditColorScheme call EditColorScheme()
+
 """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
 " HIGHLIGHTS - TODO, NOTE, FIXME, etc
 """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""