Add wesnoth.show_message_box function

src/gui/dialogs/message.cpp

@@ -79,6 +79,7 @@ void message::pre_show(window& window)
 	styled_widget& title_widget = find_widget<label>(&window, "title", false);
 	if(!title_.empty()) {
 		title_widget.set_label(title_);
+		title_widget.set_use_markup(title_use_markup_);
 	} else {
 		title_widget.set_visible(widget::visibility::invisible);
 	}
@@ -153,9 +154,10 @@ void show_message(CVideo& video,
 				  const std::string& msg,
 				  const std::string& button_caption,
 				  const bool auto_close,
-				  const bool message_use_markup)
+				  const bool message_use_markup,
+				  const bool title_use_markup)
 {
-	message dlg(title, msg, auto_close, message_use_markup);
+	message dlg(title, msg, auto_close, message_use_markup, title_use_markup);
 	dlg.set_button_caption(message::ok, button_caption);
 	dlg.show(video);
 }
@@ -165,12 +167,13 @@ int show_message(CVideo& video,
 				 const std::string& msg,
 				 const message::button_style button_style,
 				 bool message_use_markup,
-				 bool /*message_title_mode*/)
+				 bool title_use_markup)
 {
 	message dlg(title,
 				 msg,
 				 button_style == message::auto_close,
-				 message_use_markup);
+				 message_use_markup,
+				 title_use_markup);
 
 	switch(button_style) {
 		case message::auto_close:

src/gui/dialogs/message.hpp

@@ -40,12 +40,14 @@ public:
 	message(const std::string& title,
 			 const std::string& message,
 			 const bool auto_close,
-			 const bool message_use_markup)
+			 const bool message_use_markup,
+			 const bool title_use_markup)
 		: title_(title)
 		, image_()
 		, message_(message)
 		, auto_close_(auto_close)
 		, message_use_markup_(message_use_markup)
+		, title_use_markup_(title_use_markup)
 		, buttons_(count)
 	{
 	}
@@ -138,6 +140,9 @@ private:
 	/** Whether to enable formatting markup for the dialog message. */
 	bool message_use_markup_;
 
+	/** Whether to enable formatting markup for the dialog title. */
+	bool title_use_markup_;
+
 	struct button_status
 	{
 		button_status();
@@ -169,13 +174,16 @@ private:
  * @param auto_close          When true the window will hide the ok button
  *                            when the message doesn't need a scrollbar to
  *                            show itself.
+ * @param message_use_markup  Use markup for the message?
+ * @param title_use_markup    Use markup for the title?
  */
 void show_message(CVideo& video,
 				  const std::string& title,
 				  const std::string& message,
 				  const std::string& button_caption = "",
 				  const bool auto_close = true,
-				  const bool message_use_markup = false);
+				  const bool message_use_markup = false,
+				  const bool title_use_markup = false);
 
 /**
  * Shows a message to the user.

src/scripting/lua_gui2.cpp

@@ -23,6 +23,7 @@
 #include "gui/dialogs/wml_message.hpp"
 #include "gui/dialogs/story_viewer.hpp"
 #include "gui/dialogs/transient_message.hpp"
+#include "gui/dialogs/message.hpp"
 #include "gui/widgets/clickable_item.hpp"
 #include "gui/widgets/styled_widget.hpp"
 #include "gui/widgets/multi_page.hpp"
@@ -62,6 +63,7 @@
 #include <map>
 #include <utility>
 #include <vector>
+#include <boost/optional.hpp>
 
 #include "lua/lauxlib.h"                // for luaL_checkinteger, etc
 #include "lua/lua.h"                    // for lua_setfield, etc
@@ -427,6 +429,41 @@ int show_menu(lua_State* L, CVideo& video) {
 	return 1;
 }
 
+/**
+ * Displays a simple message box.
+ */
+int show_message_box(lua_State* L, CVideo& video) {
+	const std::string title = luaL_checkstring(L, 1), message = luaL_checkstring(L, 2);
+	std::string button = luaL_optstring(L, 3, "ok");
+	std::transform(button.begin(), button.end(), button.begin(), std::tolower);
+	bool markup = lua_isnoneornil(L, 3) ? luaW_toboolean(L, 3) : luaW_toboolean(L, 4);
+	using button_style = gui2::dialogs::message::button_style;
+	boost::optional<button_style> style;
+	if(button.empty()) {
+		style = button_style::auto_close;
+	} else if(button == "ok") {
+		style = button_style::ok_button;
+	} else if(button == "close") {
+		style = button_style::close_button;
+	} else if(button == "ok_cancel") {
+		style = button_style::ok_cancel_buttons;
+	} else if(button == "cancel") {
+		style = button_style::cancel_button;
+	} else if(button == "yes_no") {
+		style = button_style::yes_no_buttons;
+	}
+	if(style) {
+		int result = gui2::show_message(video, title, message, *style, markup, markup);
+		if(style == button_style::ok_cancel_buttons || style == button_style::yes_no_buttons) {
+			lua_pushboolean(L, result == gui2::window::OK);
+			return 1;
+		}
+	} else {
+		gui2::show_message(video, title, message, button, false, markup, markup);
+	}
+	return 0;
+}
+
 /**
  * Sets the value of a widget on the current dialog.
  * - Arg 1: scalar.

src/scripting/lua_gui2.hpp

@@ -39,6 +39,7 @@ int show_message_dialog(lua_State *L, CVideo & video);
 int show_popup_dialog(lua_State *L, CVideo & video);
 int show_menu(lua_State* L, CVideo& video);
 int show_story(lua_State* L, CVideo& video);
+int show_message_box(lua_State* L, CVideo& video);
 int show_lua_console(lua_State*L, CVideo & video, lua_kernel_base * lk);
 int show_gamestate_inspector(CVideo& video, const vconfig& cfg, const game_data& data, const game_state& state);
 int intf_remove_dialog_item(lua_State *L);

src/scripting/lua_kernel_base.cpp

@@ -368,6 +368,7 @@ lua_kernel_base::lua_kernel_base()
 		{ "show_message_dialog",     &video_dispatch<lua_gui2::show_message_dialog> },
 		{ "show_popup_dialog",       &video_dispatch<lua_gui2::show_popup_dialog>   },
 		{ "show_story",              &video_dispatch<lua_gui2::show_story>          },
+		{ "show_message_box",        &video_dispatch<lua_gui2::show_message_box>    },
 		{ "show_lua_console",	      &dispatch<&lua_kernel_base::intf_show_lua_console> },
 		{ "compile_formula",          &lua_formula_bridge::intf_compile_formula},
 		{ "eval_formula",             &lua_formula_bridge::intf_eval_formula},