Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/random.vim

@@ -0,0 +1,42 @@
+"----------------------------------------------------------"
+" Vim meta color file                                      "
+" Maintainer         : W. H. Jou                           "
+" Email              : whjou@singnet.com.sg                "
+" Most Recent Update : 2003-09-15                          "
+" Version            : 1.3                                 "
+"----------------------------------------------------------"
+" Define function once only
+if !exists("*s:LoadRandomColorScheme")
+  function s:LoadRandomColorScheme()
+    let s:self            = globpath(&runtimepath, 'colors/random.vim')
+    let s:color_file_list = globpath(&runtimepath, 'colors/*.vim'     )
+    let s:self            = substitute(s:self           , '\'          , '/', 'g')
+    let s:color_file_list = substitute(s:color_file_list, '\'          , '/', 'g')
+    let s:color_file_list = substitute(s:color_file_list, s:self . "\n", '' , 'g')
+    let s:color_file_list = substitute(s:color_file_list, "\n"         , ',', 'g')
+
+    if strlen(s:color_file_list)
+      if s:color_file_list =~ ','
+        let s:rnd  = matchstr(localtime(), '..$') + 0
+        let s:loop = 0
+
+        while s:loop < s:rnd
+          let s:color_file_list = substitute(s:color_file_list, '^\([^,]\+\),\(.*\)$', '\2,\1', '')
+          let s:loop            = s:loop + 1
+        endwhile
+        
+        let s:color_file = matchstr(s:color_file_list, '^[^,]\+')
+        execute "source" s:color_file
+        unlet! s:color_file
+        
+        unlet! s:loop 
+        unlet! s:rnd 
+      endif
+    endif
+
+    unlet! s:color_file_list 
+    unlet! s:self_file
+  endfunction
+endif
+"----------------------------------------------------------"
+call s:LoadRandomColorScheme()