🎨 Refactor Host Actions as singleton

Marlin/src/MarlinCore.cpp

   SERIAL_ERROR_MSG(STR_ERR_KILLED);
 
   #ifdef ACTION_ON_KILL
-    host_action_kill();
+    hostui.kill();
   #endif
 
   minkill(steppers_off);
   #endif
 
   #if ENABLED(HOST_PROMPT_SUPPORT)
-    SETUP_RUN(host_action_prompt_end());
+    SETUP_RUN(hostui.prompt_end());
   #endif
 
   #if HAS_TRINAMIC_CONFIG && DISABLED(PSU_DEFAULT_OFF)

Marlin/src/feature/e_parser.h

             case EP_M112: killed_by_M112 = true; break;
             case EP_M410: quickstop_by_M410 = true; break;
             #if ENABLED(HOST_PROMPT_SUPPORT)
-              case EP_M876SN: host_response_handler(M876_reason); break;
+              case EP_M876SN: hostui.handle_response(M876_reason); break;
             #endif
             #if ENABLED(REALTIME_REPORTING_COMMANDS)
               case EP_GRBL_STATUS: report_current_position_moving(); break;

Marlin/src/feature/host_actions.cpp

 
 #if ENABLED(HOST_ACTION_COMMANDS)
 
-#include "host_actions.h"
-
 //#define DEBUG_HOST_ACTIONS
 
+#include "host_actions.h"
+
 #if ENABLED(ADVANCED_PAUSE_FEATURE)
   #include "pause.h"
   #include "../gcode/queue.h"
   #include "runout.h"
 #endif
 
-void host_action(FSTR_P const fstr, const bool eol) {
+HostUI hostui;
+
+flag_t HostUI::flag;
+
+void HostUI::action(FSTR_P const fstr, const bool eol) {
+  if (!flag.bits) return;
   PORT_REDIRECT(SerialMask::All);
   SERIAL_ECHOPGM("//action:");
   SERIAL_ECHOF(fstr);
 }
 
 #ifdef ACTION_ON_KILL
-  void host_action_kill() { host_action(F(ACTION_ON_KILL)); }
+  void HostUI::kill() { action(F(ACTION_ON_KILL)); }
 #endif
 #ifdef ACTION_ON_PAUSE
-  void host_action_pause(const bool eol/*=true*/) { host_action(F(ACTION_ON_PAUSE), eol); }
+  void HostUI::pause(const bool eol/*=true*/) { action(F(ACTION_ON_PAUSE), eol); }
 #endif
 #ifdef ACTION_ON_PAUSED
-  void host_action_paused(const bool eol/*=true*/) { host_action(F(ACTION_ON_PAUSED), eol); }
+  void HostUI::paused(const bool eol/*=true*/) { action(F(ACTION_ON_PAUSED), eol); }
 #endif
 #ifdef ACTION_ON_RESUME
-  void host_action_resume() { host_action(F(ACTION_ON_RESUME)); }
+  void HostUI::resume() { action(F(ACTION_ON_RESUME)); }
 #endif
 #ifdef ACTION_ON_RESUMED
-  void host_action_resumed() { host_action(F(ACTION_ON_RESUMED)); }
+  void HostUI::resumed() { action(F(ACTION_ON_RESUMED)); }
 #endif
 #ifdef ACTION_ON_CANCEL
-  void host_action_cancel() { host_action(F(ACTION_ON_CANCEL)); }
+  void HostUI::cancel() { action(F(ACTION_ON_CANCEL)); }
 #endif
 #ifdef ACTION_ON_START
-  void host_action_start() { host_action(F(ACTION_ON_START)); }
+  void HostUI::start() { action(F(ACTION_ON_START)); }
+#endif
+
+#if ENABLED(G29_RETRY_AND_RECOVER)
+  #ifdef ACTION_ON_G29_RECOVER
+    void HostUI::g29_recover() { action(F(ACTION_ON_G29_RECOVER)); }
+  #endif
+  #ifdef ACTION_ON_G29_FAILURE
+    void HostUI::g29_failure() { action(F(ACTION_ON_G29_FAILURE)); }
+  #endif
 #endif
 
 #if ENABLED(HOST_PROMPT_SUPPORT)
 
+  PromptReason HostUI::host_prompt_reason = PROMPT_NOT_DEFINED;
+
   PGMSTR(CONTINUE_STR, "Continue");
   PGMSTR(DISMISS_STR, "Dismiss");
 
     extern bool wait_for_user;
   #endif
 
-  PromptReason host_prompt_reason = PROMPT_NOT_DEFINED;
-
-  void host_action_notify(const char * const cstr) {
+  void HostUI::notify(const char * const cstr) {
+    if (!flag.bits) return;
     PORT_REDIRECT(SerialMask::All);
-    host_action(F("notification "), false);
+    action(F("notification "), false);
     SERIAL_ECHOLN(cstr);
   }
 
-  void host_action_notify(FSTR_P const fstr) {
+  void HostUI::notify_P(PGM_P const pstr) {
+    if (!flag.bits) return;
     PORT_REDIRECT(SerialMask::All);
-    host_action(F("notification "), false);
-    SERIAL_ECHOLNF(fstr);
+    action(F("notification "), false);
+    SERIAL_ECHOLNPGM_P(pstr);
   }
 
-  void host_action_prompt(FSTR_P const ptype, const bool eol=true) {
+  void HostUI::prompt(FSTR_P const ptype, const bool eol/*=true*/) {
+    if (!flag.bits) return;
     PORT_REDIRECT(SerialMask::All);
-    host_action(F("prompt_"), false);
+    action(F("prompt_"), false);
     SERIAL_ECHOF(ptype);
     if (eol) SERIAL_EOL();
   }
 
-  void host_action_prompt_plus(FSTR_P const ptype, FSTR_P const fstr, const char extra_char='\0') {
-    host_action_prompt(ptype, false);
+  void HostUI::prompt_plus(FSTR_P const ptype, FSTR_P const fstr, const char extra_char/*='\0'*/) {
+    if (!flag.bits) return;
+    prompt(ptype, false);
     PORT_REDIRECT(SerialMask::All);
     SERIAL_CHAR(' ');
     SERIAL_ECHOF(fstr);
     if (extra_char != '\0') SERIAL_CHAR(extra_char);
     SERIAL_EOL();
   }
-  void host_action_prompt_begin(const PromptReason reason, FSTR_P const fstr, const char extra_char/*='\0'*/) {
-    host_action_prompt_end();
+  void HostUI::prompt_begin(const PromptReason reason, FSTR_P const fstr, const char extra_char/*='\0'*/) {
+    if (!flag.bits) return;
+    prompt_end();
     host_prompt_reason = reason;
-    host_action_prompt_plus(F("begin"), fstr, extra_char);
+    prompt_plus(F("begin"), fstr, extra_char);
   }
-  void host_action_prompt_button(FSTR_P const fstr) { host_action_prompt_plus(F("button"), fstr); }
-  void host_action_prompt_end() { host_action_prompt(F("end")); }
-  void host_action_prompt_show() { host_action_prompt(F("show")); }
-
-  void _host_prompt_show(FSTR_P const btn1/*=nullptr*/, FSTR_P const btn2/*=nullptr*/) {
-    if (btn1) host_action_prompt_button(btn1);
-    if (btn2) host_action_prompt_button(btn2);
-    host_action_prompt_show();
+  void HostUI::prompt_button(FSTR_P const fstr) { prompt_plus(F("button"), fstr); }
+  void HostUI::prompt_end() { prompt(F("end")); }
+  void HostUI::prompt_show() { prompt(F("show")); }
+
+  void HostUI::_prompt_show(FSTR_P const btn1, FSTR_P const btn2) {
+    if (btn1) prompt_button(btn1);
+    if (btn2) prompt_button(btn2);
+    prompt_show();
   }
-  void host_prompt_do(const PromptReason reason, FSTR_P const fstr, FSTR_P const btn1/*=nullptr*/, FSTR_P const btn2/*=nullptr*/) {
-    host_action_prompt_begin(reason, fstr);
-    _host_prompt_show(btn1, btn2);
+  void HostUI::prompt_do(const PromptReason reason, FSTR_P const fstr, FSTR_P const btn1/*=nullptr*/, FSTR_P const btn2/*=nullptr*/) {
+    prompt_begin(reason, fstr);
+    _prompt_show(btn1, btn2);
   }
-  void host_prompt_do(const PromptReason reason, FSTR_P const fstr, const char extra_char, FSTR_P const btn1/*=nullptr*/, FSTR_P const btn2/*=nullptr*/) {
-    host_action_prompt_begin(reason, fstr, extra_char);
-    _host_prompt_show(btn1, btn2);
+  void HostUI::prompt_do(const PromptReason reason, FSTR_P const fstr, const char extra_char, FSTR_P const btn1/*=nullptr*/, FSTR_P const btn2/*=nullptr*/) {
+    prompt_begin(reason, fstr, extra_char);
+    _prompt_show(btn1, btn2);
   }
 
-  void filament_load_host_prompt() {
-    const bool disable_to_continue = TERN0(HAS_FILAMENT_SENSOR, runout.filament_ran_out);
-    host_prompt_do(PROMPT_FILAMENT_RUNOUT, F("Paused"), F("PurgeMore"),
-      disable_to_continue ? F("DisableRunout") : FPSTR(CONTINUE_STR)
-    );
-  }
+  #if ENABLED(ADVANCED_PAUSE_FEATURE)
+    void HostUI::filament_load_prompt() {
+      const bool disable_to_continue = TERN0(HAS_FILAMENT_SENSOR, runout.filament_ran_out);
+      prompt_do(PROMPT_FILAMENT_RUNOUT, F("Paused"), F("PurgeMore"),
+        disable_to_continue ? F("DisableRunout") : FPSTR(CONTINUE_STR)
+      );
+    }
+  #endif
 
   //
   // Handle responses from the host, such as:
   //  - Resume Print response
   //  - Dismissal of info
   //
-  void host_response_handler(const uint8_t response) {
+  void HostUI::handle_response(const uint8_t response) {
     const PromptReason hpr = host_prompt_reason;
     host_prompt_reason = PROMPT_NOT_DEFINED;  // Reset now ahead of logic
     switch (hpr) {

Marlin/src/feature/host_actions.h

 #include "../inc/MarlinConfigPre.h"
 #include "../HAL/shared/Marduino.h"
 
-void host_action(FSTR_P const fstr, const bool eol=true);
-
-#ifdef ACTION_ON_KILL
-  void host_action_kill();
-#endif
-#ifdef ACTION_ON_PAUSE
-  void host_action_pause(const bool eol=true);
-#endif
-#ifdef ACTION_ON_PAUSED
-  void host_action_paused(const bool eol=true);
-#endif
-#ifdef ACTION_ON_RESUME
-  void host_action_resume();
-#endif
-#ifdef ACTION_ON_RESUMED
-  void host_action_resumed();
-#endif
-#ifdef ACTION_ON_CANCEL
-  void host_action_cancel();
-#endif
-#ifdef ACTION_ON_START
-  void host_action_start();
-#endif
+typedef union {
+  uint8_t bits;
+  struct { bool info:1, errors:1, debug:1; };
+} flag_t;
 
 #if ENABLED(HOST_PROMPT_SUPPORT)
 
-  extern const char CONTINUE_STR[], DISMISS_STR[];
-
   enum PromptReason : uint8_t {
     PROMPT_NOT_DEFINED,
     PROMPT_FILAMENT_RUNOUT,
     PROMPT_INFO
   };
 
-  extern PromptReason host_prompt_reason;
+#endif
 
-  void host_response_handler(const uint8_t response);
-  void host_action_notify(const char * const cstr);
-  void host_action_notify(FSTR_P const fstr);
-  void host_action_prompt_begin(const PromptReason reason, FSTR_P const fstr, const char extra_char='\0');
-  void host_action_prompt_button(FSTR_P const fstr);
-  void host_action_prompt_end();
-  void host_action_prompt_show();
-  void host_prompt_do(const PromptReason reason, FSTR_P const fstr, FSTR_P const btn1=nullptr, FSTR_P const btn2=nullptr);
-  void host_prompt_do(const PromptReason reason, FSTR_P const fstr, const char extra_char, FSTR_P const btn1=nullptr, FSTR_P const btn2=nullptr);
-  inline void host_prompt_open(const PromptReason reason, FSTR_P const fstr, FSTR_P const btn1=nullptr, FSTR_P const btn2=nullptr) {
-    if (host_prompt_reason == PROMPT_NOT_DEFINED) host_prompt_do(reason, fstr, btn1, btn2);
-  }
+class HostUI {
+  public:
 
-  void filament_load_host_prompt();
+  static flag_t flag;
+  HostUI() { flag.bits = 0xFF; }
 
-#endif
+  static void action(FSTR_P const fstr, const bool eol=true);
+
+  #ifdef ACTION_ON_KILL
+    static void kill();
+  #endif
+  #ifdef ACTION_ON_PAUSE
+    static void pause(const bool eol=true);
+  #endif
+  #ifdef ACTION_ON_PAUSED
+    static void paused(const bool eol=true);
+  #endif
+  #ifdef ACTION_ON_RESUME
+    static void resume();
+  #endif
+  #ifdef ACTION_ON_RESUMED
+    static void resumed();
+  #endif
+  #ifdef ACTION_ON_CANCEL
+    static void cancel();
+  #endif
+  #ifdef ACTION_ON_START
+    static void start();
+  #endif
+
+  #if ENABLED(G29_RETRY_AND_RECOVER)
+    #ifdef ACTION_ON_G29_RECOVER
+      static void g29_recover();
+    #endif
+    #ifdef ACTION_ON_G29_FAILURE
+      static void g29_failure();
+    #endif
+  #endif
+
+  #if ENABLED(HOST_PROMPT_SUPPORT)
+    private:
+    static void prompt(FSTR_P const ptype, const bool eol=true);
+    static void prompt_plus(FSTR_P const ptype, FSTR_P const fstr, const char extra_char='\0');
+    static void prompt_show();
+    static void _prompt_show(FSTR_P const btn1, FSTR_P const btn2);
+
+    public:
+    static PromptReason host_prompt_reason;
+
+    static void handle_response(const uint8_t response);
+
+    static void notify_P(PGM_P const message);
+    static inline void notify(FSTR_P const fmsg) { notify_P(FTOP(fmsg)); }
+    static void notify(const char * const message);
+
+    static void prompt_begin(const PromptReason reason, FSTR_P const fstr, const char extra_char='\0');
+    static void prompt_button(FSTR_P const fstr);
+    static void prompt_end();
+    static void prompt_do(const PromptReason reason, FSTR_P const pstr, FSTR_P const btn1=nullptr, FSTR_P const btn2=nullptr);
+    static void prompt_do(const PromptReason reason, FSTR_P const pstr, const char extra_char, FSTR_P const btn1=nullptr, FSTR_P const btn2=nullptr);
+    static inline void prompt_open(const PromptReason reason, FSTR_P const pstr, FSTR_P const btn1=nullptr, FSTR_P const btn2=nullptr) {
+      if (host_prompt_reason == PROMPT_NOT_DEFINED) prompt_do(reason, pstr, btn1, btn2);
+    }
+
+    #if ENABLED(ADVANCED_PAUSE_FEATURE)
+      static void filament_load_prompt();
+    #endif
+
+  #endif
+
+};
+
+extern HostUI hostui;
+
+extern const char CONTINUE_STR[], DISMISS_STR[];

Marlin/src/feature/mmu/mmu2.cpp

   if (recover)  {
     LCD_MESSAGE(MSG_MMU2_EJECT_RECOVER);
     BUZZ(200, 404);
-    TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, F("MMU2 Eject Recover"), FPSTR(CONTINUE_STR)));
+    TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, F("MMU2 Eject Recover"), FPSTR(CONTINUE_STR)));
     TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(F("MMU2 Eject Recover")));
     TERN_(HAS_RESUME_CONTINUE, wait_for_user_response());
     BUZZ(200, 404);

Marlin/src/feature/pause.cpp

 
     #if ENABLED(HOST_PROMPT_SUPPORT)
       const char tool = '0' + TERN0(MULTI_FILAMENT_SENSOR, active_extruder);
-      host_prompt_do(PROMPT_USER_CONTINUE, F("Load Filament T"), tool, FPSTR(CONTINUE_STR));
+      hostui.prompt_do(PROMPT_USER_CONTINUE, F("Load Filament T"), tool, FPSTR(CONTINUE_STR));
     #endif
 
     while (wait_for_user) {
     if (show_lcd) ui.pause_show_message(PAUSE_MESSAGE_PURGE);
 
     TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(GET_TEXT_F(MSG_FILAMENT_CHANGE_PURGE)));
-    TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_FILAMENT_CHANGE_PURGE), FPSTR(CONTINUE_STR)));
+    TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_FILAMENT_CHANGE_PURGE), FPSTR(CONTINUE_STR)));
     TERN_(DWIN_CREALITY_LCD_ENHANCED, DWIN_Popup_Confirm(ICON_BLTouch, GET_TEXT_F(MSG_FILAMENT_CHANGE_PURGE), FPSTR(CONTINUE_STR)));
     wait_for_user = true; // A click or M108 breaks the purge_length loop
     for (float purge_count = purge_length; purge_count > 0 && wait_for_user; --purge_count)
         unscaled_e_move(purge_length, ADVANCED_PAUSE_PURGE_FEEDRATE);
       }
 
-      TERN_(HOST_PROMPT_SUPPORT, filament_load_host_prompt()); // Initiate another host prompt.
+      TERN_(HOST_PROMPT_SUPPORT, hostui.filament_load_prompt()); // Initiate another host prompt.
 
       #if M600_PURGE_MORE_RESUMABLE
         if (show_lcd) {
     } while (TERN0(M600_PURGE_MORE_RESUMABLE, pause_menu_response == PAUSE_RESPONSE_EXTRUDE_MORE));
 
   #endif
-  TERN_(HOST_PROMPT_SUPPORT, host_action_prompt_end());
+  TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_end());
 
   return true;
 }
 
   #if ENABLED(HOST_ACTION_COMMANDS)
     #ifdef ACTION_ON_PAUSED
-      host_action_paused();
+      hostui.paused();
     #elif defined(ACTION_ON_PAUSE)
-      host_action_pause();
+      hostui.pause();
     #endif
   #endif
 
-  TERN_(HOST_PROMPT_SUPPORT, host_prompt_open(PROMPT_INFO, F("Pause"), FPSTR(DISMISS_STR)));
+  TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_open(PROMPT_INFO, F("Pause"), FPSTR(DISMISS_STR)));
 
   // Indicate that the printer is paused
   ++did_pause_print;
 
   // Wait for filament insert by user and press button
   KEEPALIVE_STATE(PAUSED_FOR_USER);
-  TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_NOZZLE_PARKED), FPSTR(CONTINUE_STR)));
+  TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_NOZZLE_PARKED), FPSTR(CONTINUE_STR)));
   TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(GET_TEXT_F(MSG_NOZZLE_PARKED)));
   wait_for_user = true;    // LCD click or M108 will clear this
   while (wait_for_user) {
       ui.pause_show_message(PAUSE_MESSAGE_HEAT);
       SERIAL_ECHO_MSG(_PMSG(STR_FILAMENT_CHANGE_HEAT));
 
-      TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_HEATER_TIMEOUT), GET_TEXT_F(MSG_REHEAT)));
+      TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_HEATER_TIMEOUT), GET_TEXT_F(MSG_REHEAT)));
 
       TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(GET_TEXT_F(MSG_HEATER_TIMEOUT)));
 
       TERN_(HAS_RESUME_CONTINUE, wait_for_user_response(0, true)); // Wait for LCD click or M108
 
-      TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_INFO, GET_TEXT_F(MSG_REHEATING)));
+      TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_INFO, GET_TEXT_F(MSG_REHEATING)));
 
       TERN_(EXTENSIBLE_UI, ExtUI::onStatusChanged(GET_TEXT_F(MSG_REHEATING)));
 
 
       HOTEND_LOOP() thermalManager.heater_idle[e].start(nozzle_timeout);
 
-      TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_REHEATDONE), FPSTR(CONTINUE_STR)));
+      TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_REHEATDONE), FPSTR(CONTINUE_STR)));
       TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(GET_TEXT_F(MSG_REHEATDONE)));
       TERN_(DWIN_CREALITY_LCD_ENHANCED, LCD_MESSAGE(MSG_REHEATDONE));
 
   ui.pause_show_message(PAUSE_MESSAGE_STATUS);
 
   #ifdef ACTION_ON_RESUMED
-    host_action_resumed();
+    hostui.resumed();
   #elif defined(ACTION_ON_RESUME)
-    host_action_resume();
+    hostui.resume();
   #endif
 
   --did_pause_print;
 
-  TERN_(HOST_PROMPT_SUPPORT, host_prompt_open(PROMPT_INFO, F("Resuming"), FPSTR(DISMISS_STR)));
+  TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_open(PROMPT_INFO, F("Resuming"), FPSTR(DISMISS_STR)));
 
   // Resume the print job timer if it was running
   if (print_job_timer.isPaused()) print_job_timer.start();

Marlin/src/feature/runout.cpp

 
   //action:out_of_filament
   #if ENABLED(HOST_PROMPT_SUPPORT)
-    host_action_prompt_begin(PROMPT_FILAMENT_RUNOUT, F("FilamentRunout T"), tool);
-    host_action_prompt_show();
+    hostui.prompt_do(PROMPT_FILAMENT_RUNOUT, F("FilamentRunout T"), tool); //action:out_of_filament
   #endif
 
   const bool run_runout_script = !runout.host_handling;
         || TERN0(ADVANCED_PAUSE_FEATURE, strstr(FILAMENT_RUNOUT_SCRIPT, "M25"))
       )
     ) {
-      host_action_paused(false);
+      hostui.paused(false);
     }
     else {
       // Legacy Repetier command for use until newer version supports standard dialog
       // To be removed later when pause command also triggers dialog
       #ifdef ACTION_ON_FILAMENT_RUNOUT
-        host_action(F(ACTION_ON_FILAMENT_RUNOUT " T"), false);
+        hostui.action(F(ACTION_ON_FILAMENT_RUNOUT " T"), false);
         SERIAL_CHAR(tool);
         SERIAL_EOL();
       #endif
 
-      host_action_pause(false);
+      hostui.pause(false);
     }
     SERIAL_ECHOPGM(" " ACTION_REASON_ON_FILAMENT_RUNOUT " ");
     SERIAL_CHAR(tool);

Marlin/src/gcode/config/M43.cpp

     #if HAS_RESUME_CONTINUE
       KEEPALIVE_STATE(PAUSED_FOR_USER);
       wait_for_user = true;
-      TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, F("M43 Wait Called"), FPSTR(CONTINUE_STR)));
+      TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, F("M43 Wait Called"), FPSTR(CONTINUE_STR)));
       TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(F("M43 Wait Called")));
     #endif
 

Marlin/src/gcode/control/M111.cpp

  * M111: Set the debug level
  */
 void GcodeSuite::M111() {
-  if (parser.seen('S')) marlin_debug_flags = parser.byteval('S');
+  if (parser.seenval('S')) marlin_debug_flags = parser.value_byte();
 
   static PGMSTR(str_debug_1, STR_DEBUG_ECHO);
   static PGMSTR(str_debug_2, STR_DEBUG_INFO);

Marlin/src/gcode/gcode.cpp

 #if ENABLED(G29_RETRY_AND_RECOVER)
 
   void GcodeSuite::event_probe_recover() {
-    TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_INFO, F("G29 Retrying"), FPSTR(DISMISS_STR)));
+    TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_INFO, F("G29 Retrying"), FPSTR(DISMISS_STR)));
     #ifdef ACTION_ON_G29_RECOVER
-      host_action(F(ACTION_ON_G29_RECOVER));
+      hostui.g29_recover();
     #endif
     #ifdef G29_RECOVER_COMMANDS
       process_subcommands_now(F(G29_RECOVER_COMMANDS));
 
   void GcodeSuite::event_probe_failure() {
     #ifdef ACTION_ON_G29_FAILURE
-      host_action(F(ACTION_ON_G29_FAILURE));
+      hostui.g29_failure();
     #endif
     #ifdef G29_FAILURE_COMMANDS
       process_subcommands_now(F(G29_FAILURE_COMMANDS));
     #endif
     #if ENABLED(G29_HALT_ON_FAILURE)
       #ifdef ACTION_ON_CANCEL
-        host_action_cancel();
+        hostui.cancel();
       #endif
       kill(GET_TEXT_F(MSG_LCD_PROBING_FAILED));
     #endif
       }
     }
 
-    TERN_(HOST_PROMPT_SUPPORT, host_action_prompt_end());
+    TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_end());
 
     #ifdef G29_SUCCESS_COMMANDS
       process_subcommands_now(F(G29_SUCCESS_COMMANDS));

Marlin/src/gcode/host/M876.cpp

  */
 void GcodeSuite::M876() {
 
-  if (parser.seenval('S')) host_response_handler((uint8_t)parser.value_int());
+  if (parser.seenval('S')) hostui.handle_response((uint8_t)parser.value_int());
 
 }
 

Marlin/src/gcode/lcd/M0_M1.cpp

 
   #endif
 
-  TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, parser.codenum ? F("M1 Stop") : F("M0 Stop"), FPSTR(CONTINUE_STR)));
+  TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, parser.codenum ? F("M1 Stop") : F("M0 Stop"), FPSTR(CONTINUE_STR)));
 
   TERN_(HAS_RESUME_CONTINUE, wait_for_user_response(ms));
 

Marlin/src/gcode/sd/M1001.cpp

     if (long_print) {
       printerEventLEDs.onPrintCompleted();
       TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(GET_TEXT_F(MSG_PRINT_DONE)));
-      TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_PRINT_DONE), FPSTR(CONTINUE_STR)));
+      TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_PRINT_DONE), FPSTR(CONTINUE_STR)));
       TERN_(HAS_RESUME_CONTINUE, wait_for_user_response(SEC_TO_MS(TERN(HAS_LCD_MENU, PE_LEDS_COMPLETED_TIME, 30))));
       printerEventLEDs.onResumeAfterWait();
     }

Marlin/src/gcode/sd/M24_M25.cpp

 
   #if ENABLED(HOST_ACTION_COMMANDS)
     #ifdef ACTION_ON_RESUME
-      host_action_resume();
+      hostui.resume();
     #endif
-    TERN_(HOST_PROMPT_SUPPORT, host_prompt_open(PROMPT_INFO, F("Resuming SD"), FPSTR(DISMISS_STR)));
+    TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_open(PROMPT_INFO, F("Resuming SD"), FPSTR(DISMISS_STR)));
   #endif
 
   ui.reset_status();
     IF_DISABLED(DWIN_CREALITY_LCD, ui.reset_status());
 
     #if ENABLED(HOST_ACTION_COMMANDS)
-      TERN_(HOST_PROMPT_SUPPORT, host_prompt_open(PROMPT_PAUSE_RESUME, F("Pause SD"), F("Resume")));
+      TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_open(PROMPT_PAUSE_RESUME, F("Pause SD"), F("Resume")));
       #ifdef ACTION_ON_PAUSE
-        host_action_pause();
+        hostui.pause();
       #endif
     #endif
 

Marlin/src/gcode/stats/M75-M78.cpp

  */
 void GcodeSuite::M76() {
   print_job_timer.pause();
-  TERN_(HOST_PAUSE_M76, host_action_pause());
+  TERN_(HOST_PAUSE_M76, hostui.pause());
 }
 
 /**

Marlin/src/lcd/e3v2/creality/dwin.cpp

         card.abortFilePrintSoon();                     // Let the main loop handle SD abort
         dwin_abort_flag = true;                        // Reset feedrate, return to Home
         #ifdef ACTION_ON_CANCEL
-          host_action_cancel();
+          hostui.cancel();
         #endif
         Popup_Window_Home(true);
         if (HMI_flag.home_flag) planner.synchronize(); // Wait for planner moves to finish!

Marlin/src/lcd/e3v2/enhanced/dwin.cpp

         card.abortFilePrintSoon();                     // Let the main loop handle SD abort
         dwin_abort_flag = true;                        // Reset feedrate, return to Home
         #ifdef ACTION_ON_CANCEL
-          host_action_cancel();
+          hostui.cancel();
         #endif
         DWIN_Draw_Popup(ICON_BLTouch, F("Stopping...") , F("Please wait until done."));
       }

Marlin/src/lcd/e3v2/jyersui/dwin.cpp

             #endif
           }
           else {
-            TERN_(HOST_ACTION_COMMANDS, host_action_resume());
+            TERN_(HOST_ACTION_COMMANDS, hostui.resume());
           }
           Draw_Print_Screen();
         }
             #endif
           }
           else {
-            TERN_(HOST_ACTION_COMMANDS, host_action_pause());
+            TERN_(HOST_ACTION_COMMANDS, hostui.pause());
           }
         }
         Draw_Print_Screen();
             thermalManager.disable_all_heaters();
           }
           else {
-            TERN_(HOST_ACTION_COMMANDS, host_action_cancel());
+            TERN_(HOST_ACTION_COMMANDS, hostui.cancel());
           }
         }
         else

Marlin/src/lcd/extui/ftdi_eve_touch_ui/cocoa_press/status_screen.cpp

       if (ExtUI::isPrintingFromMedia())
         ExtUI::pausePrint();
       #ifdef ACTION_ON_PAUSE
-        else host_action_pause();
+        else hostui.pause();
       #endif
       GOTO_SCREEN(StatusScreen);
       break;
       if (ExtUI::isPrintingFromMedia())
         ExtUI::resumePrint();
       #ifdef ACTION_ON_RESUME
-        else host_action_resume();
+        else hostui.resume();
       #endif
       GOTO_SCREEN(StatusScreen);
       break;

Marlin/src/lcd/extui/ftdi_eve_touch_ui/generic/confirm_abort_print_dialog_box.cpp

       if (ExtUI::isPrintingFromMedia())
          ExtUI::stopPrint();
       #ifdef ACTION_ON_CANCEL
-        else host_action_cancel();
+        else hostui.cancel();
       #endif
       return true;
     default:

Marlin/src/lcd/extui/ftdi_eve_touch_ui/generic/tune_menu.cpp

   if (ExtUI::isPrintingFromMedia())
     ExtUI::pausePrint();
   #ifdef ACTION_ON_PAUSE
-    else host_action_pause();
+    else hostui.pause();
   #endif
   GOTO_SCREEN(StatusScreen);
 }
   else if (ExtUI::isPrintingFromMedia())
     ExtUI::resumePrint();
   #ifdef ACTION_ON_RESUME
-    else host_action_resume();
+    else hostui.resume();
   #endif
   GOTO_SCREEN(StatusScreen);
 }

Marlin/src/lcd/extui/ui_api.cpp

   #endif // HAS_LEVELING
 
   #if ENABLED(HOST_PROMPT_SUPPORT)
-    void setHostResponse(const uint8_t response) { host_response_handler(response); }
+    void setHostResponse(const uint8_t response) { hostui.handle_response(response); }
   #endif
 
   #if ENABLED(PRINTCOUNTER)

Marlin/src/lcd/marlinui.cpp

   void MarlinUI::set_status(const char * const cstr, const bool persist) {
     if (alert_level) return;
 
-    TERN_(HOST_PROMPT_SUPPORT, host_action_notify(cstr));
+    TERN_(HOST_PROMPT_SUPPORT, hostui.notify(cstr));
 
     // Here we have a problem. The message is encoded in UTF8, so
     // arbitrarily cutting it will be a problem. We MUST be sure
     if (level < alert_level) return;
     alert_level = level;
 
-    TERN_(HOST_PROMPT_SUPPORT, host_action_notify(fstr));
+    TERN_(HOST_PROMPT_SUPPORT, hostui.notify(fstr));
 
     // Since the message is encoded in UTF8 it must
     // only be cut on a character boundary.
       card.abortFilePrintSoon();
     #endif
     #ifdef ACTION_ON_CANCEL
-      host_action_cancel();
+      hostui.cancel();
     #endif
     IF_DISABLED(SDSUPPORT, print_job_timer.stop());
-    TERN_(HOST_PROMPT_SUPPORT, host_prompt_open(PROMPT_INFO, F("UI Aborted"), FPSTR(DISMISS_STR)));
+    TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_open(PROMPT_INFO, F("UI Aborted"), FPSTR(DISMISS_STR)));
     LCD_MESSAGE(MSG_PRINT_ABORTED);
     TERN_(HAS_LCD_MENU, return_to_status());
   }
     #endif
 
     TERN_(HAS_TOUCH_SLEEP, wakeup_screen());
-    TERN_(HOST_PROMPT_SUPPORT, host_prompt_open(PROMPT_PAUSE_RESUME, F("UI Pause"), F("Resume")));
+    TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_open(PROMPT_PAUSE_RESUME, F("UI Pause"), F("Resume")));
 
     LCD_MESSAGE(MSG_PRINT_PAUSED);
 
     #elif ENABLED(SDSUPPORT)
       queue.inject(F("M25"));
     #elif defined(ACTION_ON_PAUSE)
-      host_action_pause();
+      hostui.pause();
     #endif
   }
 
     TERN_(PARK_HEAD_ON_PAUSE, wait_for_heatup = wait_for_user = false);
     TERN_(SDSUPPORT, if (IS_SD_PAUSED()) queue.inject_P(M24_STR));
     #ifdef ACTION_ON_RESUME
-      host_action_resume();
+      hostui.resume();
     #endif
     print_job_timer.start(); // Also called by M24
   }
   // Send the status line as a host notification
   //
   void MarlinUI::set_status(const char * const cstr, const bool) {
-    TERN(HOST_PROMPT_SUPPORT, host_action_notify(cstr), UNUSED(cstr));
+    TERN(HOST_PROMPT_SUPPORT, hostui.notify(cstr), UNUSED(cstr));
   }
   void MarlinUI::set_status(FSTR_P const fstr, const int8_t) {
-    TERN(HOST_PROMPT_SUPPORT, host_action_notify(fstr), UNUSED(fstr));
+    TERN(HOST_PROMPT_SUPPORT, hostui.notify(fstr), UNUSED(fstr));
   }
   void MarlinUI::status_printf(const uint8_t, FSTR_P const fstr, ...) {
-    TERN(HOST_PROMPT_SUPPORT, host_action_notify(fstr), UNUSED(fstr));
+    TERN(HOST_PROMPT_SUPPORT, hostui.notify(fstr), UNUSED(fstr));
   }
 
 #endif // !HAS_DISPLAY && !HAS_STATUS_MESSAGE

Marlin/src/lcd/menu/menu_delta_calibrate.cpp

     #include "../../MarlinCore.h" // for wait_for_user_response()
   #endif
   #if ENABLED(HOST_PROMPT_SUPPORT)
-    #include "../../feature/host_actions.h" // for host_prompt_do
+    #include "../../feature/host_actions.h" // for hostui.prompt_do
   #endif
 
   float lcd_probe_pt(const xy_pos_t &xy) {
     _man_probe_pt(xy);
     ui.defer_status_screen();
-    TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, F("Delta Calibration in progress"), FPSTR(CONTINUE_STR)));
+    TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, F("Delta Calibration in progress"), FPSTR(CONTINUE_STR)));
     TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(F("Delta Calibration in progress")));
     TERN_(HAS_RESUME_CONTINUE, wait_for_user_response());
     ui.goto_previous_screen_no_defer();

Marlin/src/lcd/menu/menu_main.cpp

       ACTION_ITEM(MSG_RESUME_PRINT, ui.resume_print);
 
     #if ENABLED(HOST_START_MENU_ITEM) && defined(ACTION_ON_START)
-      ACTION_ITEM(MSG_HOST_START_PRINT, host_action_start);
+      ACTION_ITEM(MSG_HOST_START_PRINT, hostui.start);
     #endif
 
     #if ENABLED(PREHEAT_SHORTCUT_MENU_ITEM)

Marlin/src/module/probe.cpp

       LCD_MESSAGE(MSG_MANUAL_DEPLOY_TOUCHMI);
       ui.return_to_status();
 
-      TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, F("Deploy TouchMI"), FPSTR(CONTINUE_STR)));
+      TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, F("Deploy TouchMI"), FPSTR(CONTINUE_STR)));
       TERN_(HAS_RESUME_CONTINUE, wait_for_user_response());
       ui.reset_status();
       ui.goto_screen(prev_screen);
       ui.set_status(ds_str, 99);
       SERIAL_ECHOLNF(ds_str);
 
-      TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, F("Stow Probe"), FPSTR(CONTINUE_STR)));
+      TERN_(HOST_PROMPT_SUPPORT, hostui.prompt_do(PROMPT_USER_CONTINUE, F("Stow Probe"), FPSTR(CONTINUE_STR)));
       TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(F("Stow Probe")));
       TERN_(DWIN_CREALITY_LCD_ENHANCED, DWIN_Popup_Confirm(ICON_BLTouch, F("Stow Probe"), FPSTR(CONTINUE_STR)));
       TERN_(HAS_RESUME_CONTINUE, wait_for_user_response());