Avoid "Press ENTER..." prompt

When adding input programmatically the 'silent' flag is automatically
set.  Hopefully this will mean the end of the annoying "Press ENTER..."
prompt.  This also means that it should no longer be necessary to
manually try to make commands silent (e.g. ":redr|f" should not be
needed).

src/MacVim/MMBackend.m

@@ -1236,11 +1236,18 @@ static NSString *MMSymlinkWarningString =
 }
 
 - (void)addInput:(in bycopy NSString *)input
-                 client:(in byref id <MMVimClientProtocol>)client
+          client:(in byref id <MMVimClientProtocol>)client
 {
     //NSLog(@"addInput:%@ client:%@", input, (id)client);
 
-    [self addInput:input];
+    // NOTE: We don't call addInput: here because it differs from
+    // server_to_input_buf() in that it always sets the 'silent' flag and we
+    // don't want the MacVim client/server code to behave differently from
+    // other platforms.
+    char_u *s = [input vimStringSave];
+    server_to_input_buf(s);
+    vim_free(s);
+
     [self addClient:(id)client];
 }
 
@@ -2524,17 +2531,45 @@ static NSString *MMSymlinkWarningString =
 
 - (void)addInput:(NSString *)input
 {
-    char_u *s = (char_u*)[input UTF8String];
+    // NOTE: This code is essentially identical to server_to_input_buf(),
+    // except the 'silent' flag is TRUE in the call to ins_typebuf() below.
+    char_u      *str = [input vimStringSave];
+    char_u      *ptr = NULL;
+    char_u      *cpo_save = p_cpo;
 
-#ifdef FEAT_MBYTE
-    s = CONVERT_FROM_UTF8(s);
-#endif
+    if (!str) return;
 
-    server_to_input_buf(s);
+    /* Set 'cpoptions' the way we want it.
+     *    B set - backslashes are *not* treated specially
+     *    k set - keycodes are *not* reverse-engineered
+     *    < unset - <Key> sequences *are* interpreted
+     *  The last but one parameter of replace_termcodes() is TRUE so that the
+     *  <lt> sequence is recognised - needed for a real backslash.
+     */
+    p_cpo = (char_u *)"Bk";
+    str = replace_termcodes((char_u *)str, &ptr, FALSE, TRUE, FALSE);
+    p_cpo = cpo_save;
 
-#ifdef FEAT_MBYTE
-    CONVERT_FROM_UTF8_FREE(s);
-#endif
+    if (*ptr != NUL)	/* trailing CTRL-V results in nothing */
+    {
+	/*
+	 * Add the string to the input stream.
+	 * Can't use add_to_input_buf() here, we now have K_SPECIAL bytes.
+	 *
+	 * First clear typed characters from the typeahead buffer, there could
+	 * be half a mapping there.  Then append to the existing string, so
+	 * that multiple commands from a client are concatenated.
+	 */
+	if (typebuf.tb_maplen < typebuf.tb_len)
+	    del_typebuf(typebuf.tb_len - typebuf.tb_maplen, typebuf.tb_maplen);
+	(void)ins_typebuf(str, REMAP_NONE, typebuf.tb_len, TRUE, TRUE);
+
+	/* Let input_available() know we inserted text in the typeahead
+	 * buffer. */
+	typebuf_was_filled = TRUE;
+    }
+    vim_free((char_u *)ptr);
+    vim_free(str);
 }
 
 - (BOOL)unusedEditor