Add board-name editor + auto-prompt for global leaderboard

When the global leaderboard is enabled but no board name is configured,
prompt the user for one on first main-menu entry of the session. The
editor itself is also reachable any time via Options > Leaderboard Board
Name.

- edit_board_t / st_edit_board_t: clones the new_player_t arrow-key text
  editor. Bound to prefs->leaderboard_board; allows [A-Za-z0-9_-]; OK
  trims trailing arrow-key noise, writes back, and marks prefs dirty.
- st_main_menu_t::open: on first main-menu entry of the session with
  global_leaderboard on and board empty, push st_edit_board. Static guard
  prevents re-prompting after cancel (user can always reach the editor
  via the options menu).
- options_main_t: adds "Leaderboard Board Name" entry, gated on
  global_leaderboard being on so it doesn't clutter the menu otherwise.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

states.cpp

@@ -1357,6 +1357,18 @@ kobo_form_t *st_main_menu_t::open()
 
 	menu = new main_menu_t;
 	menu->open();
+
+	// First time we reach the main menu with the leaderboard on but no
+	// board name configured, prompt for one. Only once per session — if
+	// the user cancels, they can edit it from Options later.
+	static bool prompted_for_board = false;
+	if(!prompted_for_board && prefs->global_leaderboard
+			&& prefs->leaderboard_board[0] == '\0')
+	{
+		prompted_for_board = true;
+		gsm.push(&st_edit_board);
+	}
+
 	return menu;
 }
 
@@ -1561,6 +1573,8 @@ void options_main_t::build()
 	button("Graphics", 6);
 	button("Audio", 2);
 	button("System", 5);
+	if(prefs->global_leaderboard)
+		button("Leaderboard Board Name", 7);
 	space();
 
 	button("DONE!", 0);
@@ -1595,6 +1609,9 @@ void st_options_main_t::select(int tag)
 	  case 6:
 		gsm.push(&st_options_graphics);
 		break;
+	  case 7:
+		gsm.push(&st_edit_board);
+		break;
 	}
 }
 
@@ -2142,3 +2159,238 @@ void st_global_leaderboard_t::post_render()
 
 st_global_leaderboard_t st_global_leaderboard;
 
+
+/*----------------------------------------------------------
+	Edit leaderboard board name
+----------------------------------------------------------*/
+//
+// Cloned from new_player_t. Differences: bound to prefs->leaderboard_board,
+// allows alphanumerics + '-' / '_' (room-code shape), no profile creation —
+// OK writes the value back into prefs and pops.
+
+void edit_board_t::open()
+{
+	init(gengine);
+	place(wmain->x(), wmain->y(), wmain->width(), wmain->height());
+	font(B_NORMAL_FONT);
+	foreground(wmain->map_rgb(255, 255, 255));
+	background(wmain->map_rgb(0, 0, 0));
+	memset(buf, 0, sizeof(buf));
+	strncpy(buf, prefs->leaderboard_board, sizeof(buf) - 1);
+	currentIndex = strlen(buf);
+	if(currentIndex == 0)
+	{
+		buf[0] = 'A';
+		currentIndex = 0;
+	}
+	editing = 1;
+	build_all();
+	if(gengine->window_handle())
+		SDL_StartTextInput(gengine->window_handle());
+}
+
+void edit_board_t::close()
+{
+	if(gengine->window_handle())
+		SDL_StopTextInput(gengine->window_handle());
+	clean();
+}
+
+void edit_board_t::change(int delta)
+{
+	kobo_form_t::change(delta);
+	if(!selected()) return;
+	selection = selected()->tag;
+}
+
+void edit_board_t::build()
+{
+	medium();
+	space(2);
+	label("Global Leaderboard");
+	label("Use arrows or keyboard to enter board name");
+	label("(share it with friends to compete)");
+
+	big();
+	space();
+	button(buf, 1);
+	space();
+
+	button("Ok", MENU_TAG_OK);
+	button("Cancel", MENU_TAG_CANCEL);
+}
+
+void edit_board_t::rebuild()
+{
+	int sel = selected_index();
+	build_all();
+	select(sel);
+}
+
+static bool board_char_valid(int c)
+{
+	return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')
+		|| (c >= '0' && c <= '9') || c == '-' || c == '_';
+}
+
+st_edit_board_t::st_edit_board_t()
+{
+	name = "edit_board";
+}
+
+void st_edit_board_t::frame()       { manage.run_intro(); }
+void st_edit_board_t::enter()       { menu.open(); run_intro = 0; sound.ui_ok(); }
+void st_edit_board_t::leave()       { menu.close(); }
+void st_edit_board_t::post_render() { kobo_basestate_t::post_render(); menu.render(); }
+
+void st_edit_board_t::press(int button)
+{
+	if(menu.editing)
+	{
+		switch(button)
+		{
+		  case BTN_EXIT:
+			sound.ui_ok();
+			menu.editing = 0;
+			menu.next();	// Select the CANCEL option.
+			menu.next();
+			break;
+
+		  case BTN_FIRE:
+			if(!prefs->use_joystick) break;
+			// fallthrough
+		  case BTN_START:
+		  case BTN_SELECT:
+			sound.ui_ok();
+			menu.editing = 0;
+			menu.next();	// Select the OK option.
+			break;
+
+		  case BTN_UP:
+		  case BTN_INC:
+		  {
+			char &c = menu.buf[menu.currentIndex];
+			if(!c)                        c = 'A';
+			else if(c == 'Z')             c = 'a';
+			else if(c == 'z')             c = '0';
+			else if(c == '9')             c = '-';
+			else if(c == '-')             c = '_';
+			else if(c == '_')             c = 'A';
+			else                          c++;
+			sound.ui_tick();
+			break;
+		  }
+
+		  case BTN_DOWN:
+		  case BTN_DEC:
+		  {
+			char &c = menu.buf[menu.currentIndex];
+			if(!c)                        c = 'A';
+			else if(c == 'A')             c = '_';
+			else if(c == '_')             c = '-';
+			else if(c == '-')             c = '9';
+			else if(c == '0')             c = 'z';
+			else if(c == 'a')             c = 'Z';
+			else                          c--;
+			sound.ui_tick();
+			break;
+		  }
+
+		  case BTN_RIGHT:
+			if(menu.currentIndex < sizeof(menu.buf) - 2)
+			{
+				menu.currentIndex++;
+				sound.ui_tick();
+			}
+			else
+			{
+				sound.ui_error();
+				break;
+			}
+			if(menu.buf[menu.currentIndex] == '\0')
+				menu.buf[menu.currentIndex] = 'A';
+			break;
+
+		  case BTN_LEFT:
+		  case BTN_BACK:
+			if(menu.currentIndex > 0)
+			{
+				menu.buf[menu.currentIndex] = '\0';
+				menu.currentIndex--;
+				sound.ui_tick();
+			}
+			else
+				sound.ui_error();
+			break;
+
+		  default:
+			if(board_char_valid(unicode))
+			{
+				menu.buf[menu.currentIndex] = (char)unicode;
+				if(menu.currentIndex < sizeof(menu.buf) - 2)
+				{
+					menu.currentIndex++;
+					sound.ui_tick();
+				}
+				else
+					sound.ui_error();
+			}
+			else
+				sound.ui_error();
+			break;
+		}
+		menu.rebuild();
+	}
+	else
+	{
+		menu.selection = -1;
+		switch(button)
+		{
+		  case BTN_EXIT:   menu.selection = MENU_TAG_CANCEL; break;
+		  case BTN_CLOSE:  menu.selection = MENU_TAG_OK;     break;
+		  case BTN_FIRE:
+		  case BTN_START:
+		  case BTN_SELECT: menu.change(0); break;
+		  case BTN_INC:
+		  case BTN_UP:     menu.prev(); break;
+		  case BTN_DEC:
+		  case BTN_DOWN:   menu.next(); break;
+		}
+
+		switch(menu.selection)
+		{
+		  case 1:
+			if(button == BTN_START || button == BTN_SELECT
+					|| button == BTN_FIRE)
+			{
+				sound.ui_ok();
+				menu.editing = 1;
+			}
+			break;
+
+		  case MENU_TAG_OK:
+		  {
+			// Trim trailing garbage from arrow-key wandering.
+			size_t n = strlen(menu.buf);
+			while(n > 0 && !board_char_valid(menu.buf[n - 1]))
+				menu.buf[--n] = '\0';
+			strncpy(prefs->leaderboard_board, menu.buf,
+				sizeof(prefs->leaderboard_board) - 1);
+			prefs->leaderboard_board[
+				sizeof(prefs->leaderboard_board) - 1] = '\0';
+			prefs->changed = 1;
+			sound.ui_ok();
+			pop();
+			break;
+		  }
+
+		  case MENU_TAG_CANCEL:
+			sound.ui_cancel();
+			pop();
+			break;
+		}
+	}
+}
+
+st_edit_board_t st_edit_board;
+

states.h

@@ -473,6 +473,37 @@ class st_ask_abort_game_t : public st_yesno_base_t
 };
 
 
+/*----------------------------------------------------------
+	Edit leaderboard board name
+----------------------------------------------------------*/
+
+class edit_board_t : public kobo_form_t
+{
+  public:
+	int		editing;
+	char		buf[32];
+	unsigned	currentIndex;
+	int		selection;
+	virtual void change(int delta);
+	virtual void build();
+	void open();
+	void close();
+	void rebuild();
+};
+
+class st_edit_board_t : public kobo_basestate_t
+{
+  public:
+	edit_board_t	menu;
+	st_edit_board_t();
+	void enter();
+	void leave();
+	void press(int button);
+	void frame();
+	void post_render();
+};
+
+
 /*----------------------------------------------------------
 	Global Leaderboard browser
 ----------------------------------------------------------*/
@@ -550,6 +581,7 @@ extern st_options_graphics_t st_options_graphics;
 extern st_options_audio_t st_options_audio;
 extern st_options_control_t st_options_control;
 extern st_options_game_t st_options_game;
+extern st_edit_board_t st_edit_board;
 extern st_global_leaderboard_t st_global_leaderboard;
 extern st_error_t st_error;
 #ifdef PROFILE_AUDIO