debugger: Erase prompt when repeating command.

Enterring a blank command continues the disassembly or stepping for one instruction. Erasing the prompt saves one line in the console so the disassembly doesn't appear double spaced. I don't know if the terminal control sequence works in Windows.

Author: joevt

debugger/debugger.cpp

@@ -438,6 +438,13 @@ static void mysig_handler(int signum)
 }
 #endif
 
+static void delete_prompt() {
+#ifndef _WIN32
+    // move up, carriage return (move to column 0), erase from cursor to end of line
+    cout << "\e[A\r\e[0K";
+#endif
+}
+
 void enter_debugger() {
     string inp, cmd, addr_str, expr_str, reg_expr, last_cmd, reg_value_str,
            inst_string, inst_num_str, profile_name, sub_cmd;
@@ -620,11 +627,17 @@ void enter_debugger() {
 
             if (context == 2) {
 #ifdef ENABLE_68K_DEBUGGER
+                if (cmd_repeat) {
+                    delete_prompt();
+                }
                 for (; --count >= 0;) {
                     exec_single_68k();
                 }
 #endif
             } else {
+                if (cmd_repeat) {
+                    delete_prompt();
+                }
                 for (; --count >= 0;) {
                     ppc_exec_single();
                 }
@@ -703,6 +716,7 @@ void enter_debugger() {
                     if (context == 2) {
 #ifdef ENABLE_68K_DEBUGGER
                         if (cmd_repeat) {
+                            delete_prompt();
                             addr = next_addr_68k;
                         }
                         else {
@@ -713,6 +727,7 @@ void enter_debugger() {
 #endif
                     } else {
                         if (cmd_repeat) {
+                            delete_prompt();
                             addr = next_addr_ppc;
                         }
                         else {