vim-patch:7.4.191

Problem:    Escaping a file name for shell commands can't be done without a
            function.
Solution:   Add the :S file name modifier.

https://code.google.com/p/vim/source/detail?r=40f18a1c1592c8b4047f6f2a413557f48a99c55f

src/eval.c

@@ -13715,7 +13715,7 @@ static void f_sha256(typval_T *argvars, typval_T *rettv)
 static void f_shellescape(typval_T *argvars, typval_T *rettv)
 {
   rettv->vval.v_string = vim_strsave_shellescape(
-      get_tv_string(&argvars[0]), non_zero_arg(&argvars[1]));
+    get_tv_string(&argvars[0]), non_zero_arg(&argvars[1]), true);
   rettv->v_type = VAR_STRING;
 }
 
@@ -19645,6 +19645,14 @@ repeat:
     }
   }
 
+  if (src[*usedlen] == ':' && src[*usedlen + 1] == 'S') {
+    p = vim_strsave_shellescape(*fnamep, false, false);
+    vim_free(*bufp);
+    *bufp = *fnamep = p;
+    *fnamelen = (int)STRLEN(p);
+    *usedlen += 2;
+  }
+
   return valid;
 }