UI/ext_messages: learn more message kinds

ref #6201

src/nvim/ex_cmds.c

@@ -3692,10 +3692,9 @@ static buf_T *do_sub(exarg_T *eap, proftime_T timeout,
               i = msg_scroll;
               msg_scroll = 0;                           /* truncate msg when
                                                            needed */
-              msg_no_more = TRUE;
-              /* write message same highlighting as for
-               * wait_return */
-              smsg_attr(HL_ATTR(HLF_R),
+              msg_no_more = true;
+              msg_ext_set_kind("confirm_sub");
+              smsg_attr(HL_ATTR(HLF_R),  // Same highlight as wait_return().
                         _("replace with %s (y/n/a/q/l/^E/^Y)?"), sub);
               msg_no_more = FALSE;
               msg_scroll = i;

src/nvim/ex_docmd.c

@@ -839,9 +839,10 @@ int do_cmdline(char_u *cmdline, LineGetter fgetline,
       sourcing_lnum = current_exception->throw_lnum;
       current_exception->throw_name = NULL;
 
-      discard_current_exception();              /* uses IObuff if 'verbose' */
-      suppress_errthrow = TRUE;
-      force_abort = TRUE;
+      discard_current_exception();              // uses IObuff if 'verbose'
+      suppress_errthrow = true;
+      force_abort = true;
+      msg_ext_set_kind("emsg");  // kind=emsg for :throw, exceptions. #9993
 
       if (messages != NULL) {
         do {

src/nvim/message.c

@@ -3008,6 +3008,8 @@ void give_warning(char_u *message, bool hl) FUNC_ATTR_NONNULL_ARG(1)
   } else {
     keep_msg_attr = 0;
   }
+  msg_ext_set_kind("wmsg");
+
   if (msg_attr((const char *)message, keep_msg_attr) && msg_scrolled == 0) {
     set_keep_msg(message, keep_msg_attr);
   }
@@ -3348,6 +3350,7 @@ void display_confirm_msg(void)
   // Avoid that 'q' at the more prompt truncates the message here.
   confirm_msg_used++;
   if (confirm_msg != NULL) {
+    msg_ext_set_kind("confirm");
     msg_puts_attr((const char *)confirm_msg, HL_ATTR(HLF_M));
   }
   confirm_msg_used--;

src/nvim/misc1.c

@@ -2248,6 +2248,7 @@ change_warning (
     if (msg_row == Rows - 1)
       msg_col = col;
     msg_source(HL_ATTR(HLF_W));
+    msg_ext_set_kind("wmsg");
     MSG_PUTS_ATTR(_(w_readonly), HL_ATTR(HLF_W) | MSG_HIST);
     set_vim_var_string(VV_WARNINGMSG, _(w_readonly), -1);
     msg_clr_eos();

src/nvim/vim.h

@@ -277,7 +277,6 @@ enum { FOLD_TEXT_LEN = 51 };  //!< buffer size for get_foldtext()
 
 // Enums need a typecast to be used as array index (for Ultrix).
 #define HL_ATTR(n)      highlight_attr[(int)(n)]
-#define TERM_STR(n)     term_strings[(int)(n)]
 
 /// Maximum number of bytes in a multi-byte character.  It can be one 32-bit
 /// character of up to 6 bytes, or one 16-bit character of up to three bytes