Make the menubar entries for hide, hide others and show all work on mac os

src/command/app.cpp

@@ -297,6 +297,39 @@ struct app_bring_to_front final : public Command {
 		osx::bring_to_front();
 	}
 };
+
+struct app_hide final : public Command {
+	CMD_NAME("app/hide")
+	STR_MENU("Hide")
+	STR_DISP("Hide")
+	STR_HELP("Hide the application")
+
+	void operator()(agi::Context *) override {
+		osx::hide_aegisub();
+	}
+};
+
+struct app_hide_others final : public Command {
+	CMD_NAME("app/hide_others")
+	STR_MENU("Hide others")
+	STR_DISP("Hide others")
+	STR_HELP("Hide all other applications")
+
+	void operator()(agi::Context *) override {
+		osx::hide_others();
+	}
+};
+
+struct app_show_all final : public Command {
+	CMD_NAME("app/show_all")
+	STR_MENU("Show all")
+	STR_DISP("Show all")
+	STR_HELP("Show all applications")
+
+	void operator()(agi::Context *) override {
+		osx::show_all();
+	}
+};
 #endif
 
 }
@@ -319,6 +352,9 @@ namespace cmd {
 		reg(std::make_unique<app_minimize>());
 		reg(std::make_unique<app_maximize>());
 		reg(std::make_unique<app_bring_to_front>());
+		reg(std::make_unique<app_hide>());
+		reg(std::make_unique<app_hide_others>());
+		reg(std::make_unique<app_show_all>());
 #endif
 #ifdef WITH_UPDATE_CHECKER
 		reg(std::make_unique<app_updates>());

src/menu.cpp

@@ -258,6 +258,15 @@ class CommandManager {
 				case wxID_PREFERENCES:
 					cmd::call("app/options", context);
 					break;
+				case wxID_OSX_HIDE:
+					cmd::call("app/hide", context);
+					break;
+				case wxID_OSX_HIDEOTHERS:
+					cmd::call("app/hide_others", context);
+					break;
+				case wxID_OSX_SHOWALL:
+					cmd::call("app/show_all", context);
+					break;
 				case wxID_EXIT:
 					cmd::call("app/exit", context);
 					break;

src/osx/osx_utils.mm

@@ -83,4 +83,16 @@ bool activate_top_window_other_than(wxFrame *wx) {
 void bring_to_front() {
 	[NSApp arrangeInFront:nil];
 }
+
+void hide_aegisub() {
+    [NSApp hide:nil];
+}
+
+void hide_others() {
+    [NSApp hideOtherApplications:nil];
+}
+
+void show_all() {
+    [NSApp unhideAllApplications:nil];
+}
 }

src/utils.h

@@ -106,4 +106,10 @@ namespace osx {
 	bool activate_top_window_other_than(wxFrame *wx);
 	// Bring all windows to the front, maintaining relative z-order
 	void bring_to_front();
+	// Hide the application
+	void hide_aegisub();
+	// Hide all other applications
+	void hide_others();
+	// Unhide all applications
+	void show_all();
 }