--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -5408,6 +5408,25 @@ get_bad_opt(char_u *p, exarg_T *eap)
 }
 
 /*
+ * Function given to ExpandGeneric() to obtain the list of bad= names.
+ */
+    static char_u *
+get_bad_name(expand_T *xp UNUSED, int idx)
+{
+    // Note: Keep this in sync with getargopt.
+    static char *(p_bad_values[]) =
+    {
+	"?",
+	"keep",
+	"drop",
+    };
+
+    if (idx < (int)ARRAY_LENGTH(p_bad_values))
+	return (char_u*)p_bad_values[idx];
+    return NULL;
+}
+
+/*
  * Get "++opt=arg" argument.
  * Return FAIL or OK.
  */
@@ -5419,6 +5438,8 @@ getargopt(exarg_T *eap)
     int		bad_char_idx;
     char_u	*p;
 
+    // Note: Keep this in sync with get_argopt_name.
+
     // ":edit ++[no]bin[ary] file"
     if (STRNCMP(arg, "bin", 3) == 0 || STRNCMP(arg, "nobin", 5) == 0)
     {
@@ -5499,6 +5520,96 @@ getargopt(exarg_T *eap)
     return OK;
 }
 
+/*
+ * Function given to ExpandGeneric() to obtain the list of ++opt names.
+ */
+    static char_u *
+get_argopt_name(expand_T *xp UNUSED, int idx)
+{
+    // Note: Keep this in sync with getargopt.
+    static char *(p_opt_values[]) =
+    {
+	"fileformat=",
+	"encoding=",
+	"binary",
+	"nobinary",
+	"bad=",
+	"edit",
+    };
+
+    if (idx < (int)ARRAY_LENGTH(p_opt_values))
+	return (char_u*)p_opt_values[idx];
+    return NULL;
+}
+
+/*
+ * Command-line expansion for ++opt=name.
+ */
+    int
+expand_argopt(
+	char_u	    *pat,
+	expand_T    *xp,
+	regmatch_T  *rmp,
+	char_u	    ***matches,
+	int	    *numMatches)
+{
+    if (xp->xp_pattern > xp->xp_line && *(xp->xp_pattern-1) == '=')
+    {
+	char_u *(*cb)(expand_T *, int) = NULL;
+
+	char_u *name_end = xp->xp_pattern - 1;
+	if (name_end - xp->xp_line >= 2
+		&& STRNCMP(name_end - 2, "ff", 2) == 0)
+	    cb = get_fileformat_name;
+	else if (name_end - xp->xp_line >= 10
+		&& STRNCMP(name_end - 10, "fileformat", 10) == 0)
+	    cb = get_fileformat_name;
+	else if (name_end - xp->xp_line >= 3
+		&& STRNCMP(name_end - 3, "enc", 3) == 0)
+	    cb = get_encoding_name;
+	else if (name_end - xp->xp_line >= 8
+		&& STRNCMP(name_end - 8, "encoding", 8) == 0)
+	    cb = get_encoding_name;
+	else if (name_end - xp->xp_line >= 3
+		&& STRNCMP(name_end - 3, "bad", 3) == 0)
+	    cb = get_bad_name;
+
+	if (cb != NULL)
+	{
+	    return ExpandGeneric(
+		    pat,
+		    xp,
+		    rmp,
+		    matches,
+		    numMatches,
+		    cb,
+		    FALSE);
+	}
+	return FAIL;
+    }
+
+    // Special handling of "ff" which acts as a short form of
+    // "fileformat", as "ff" is not a substring of it.
+    if (STRCMP(xp->xp_pattern, "ff") == 0)
+    {
+	*matches = ALLOC_MULT(char_u *, 1);
+	if (*matches == NULL)
+	    return FAIL;
+	*numMatches = 1;
+	(*matches)[0] = vim_strsave((char_u*)"fileformat=");
+	return OK;
+    }
+
+    return ExpandGeneric(
+	    pat,
+	    xp,
+	    rmp,
+	    matches,
+	    numMatches,
+	    get_argopt_name,
+	    FALSE);
+}
+
     static void
 ex_autocmd(exarg_T *eap)
 {