Tux Paint for macOS can localize menus (feature request #183)

Tux Paint for macOS can now localize the macOS menubar.  Translation
files (*.po) will be required for the actual translations to show.

Makefile

@@ -159,7 +159,7 @@ ios_BUNDLE:=./TuxPaint-$(SDK).app
 BUNDLE:=$($(OS)_BUNDLE)
 
 windows_ARCH_LIBS:=obj/win32_print.o obj/resource.o obj/win32_trash.o
-macos_ARCH_LIBS:=src/macos_print.m obj/macos.o
+macos_ARCH_LIBS:=src/macos_print.m obj/macos.o obj/macosm.o
 ios_ARCH_LIBS:=src/ios_print.m obj/ios.o
 beos_ARCH_LIBS:=obj/BeOS_print.o
 linux_ARCH_LIBS:=obj/postscript_print.o
@@ -1304,10 +1304,16 @@ obj/postscript_print.o:	src/postscript_print.c \
 
 obj/macos.o: src/macos.c src/macos.h src/platform.h src/debug.h
 	@echo
-	@echo "...Compiling macOS support..."
+	@echo "...Compiling macOS support (Part 1)..."
 	@$(CC) $(CFLAGS) $(DEBUG_FLAGS) $(SDL_CFLAGS) $(DEFS) \
 		-c src/macos.c -o obj/macos.o
 
+obj/macosm.o: src/macos.m src/macos.h src/platform.h src/debug.h
+	@echo
+	@echo "...Compiling macOS support (Part 2)..."
+	@$(CC) $(CFLAGS) $(DEBUG_FLAGS) $(SDL_CFLAGS) $(DEFS) \
+		-c src/macos.m -o obj/macosm.o
+
 obj/ios.o: src/ios.c src/ios.h src/platform.h src/debug.h
 	@echo
 	@echo "...Compiling iOS support..."

src/macos.h

@@ -26,6 +26,7 @@
 #define KMOD_CTRL   KMOD_META   /* Anywhere Linux/Windows uses CTRL, use CMD on macOS */
 
 
+void apple_init(void);
 const char *apple_fontsPath(void);
 const char *apple_preferencesPath(void);
 const char *apple_globalPreferencesPath(void);

src/macos.m

@@ -0,0 +1,128 @@
+/*
+  macos.m
+
+  Copyright (c) 2022
+  http://www.tuxpaint.org/
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+  (See COPYING.txt)
+*/
+
+#import <Cocoa/Cocoa.h>
+#import <libintl.h>
+#import "macos.h"
+
+
+static void setupApplicationMenu(void)
+{
+    /*
+    * Forked from SDLMain.m that comes with the SDL source code that comes with
+    * MacPorts.  Credits to Darrell Walisser <dwaliss1@purdue.edu> and Max Horn
+    * <max@quendi.de>.
+    */
+
+    /* warning: this code is very odd */
+    NSMenu *appleMenu;
+    NSMenuItem *menuItem;
+    NSString *title;
+
+    appleMenu = [[NSMenu alloc] initWithTitle:@""];
+
+    /* Add menu items */
+    title = [NSString stringWithUTF8String:gettext("About Tux Paint")];
+    [appleMenu addItemWithTitle:title action:@selector(orderFrontStandardAboutPanel:) keyEquivalent:@""];
+
+    [appleMenu addItem:[NSMenuItem separatorItem]];
+
+    title = [NSString stringWithUTF8String:gettext("Hide Tux Paint")];
+    [appleMenu addItemWithTitle:title action:@selector(hide:) keyEquivalent:@"h"];
+
+    menuItem = (NSMenuItem *)[appleMenu addItemWithTitle:[NSString stringWithUTF8String:gettext("Hide Others")] action:@selector(hideOtherApplications:) keyEquivalent:@"h"];
+    [menuItem setKeyEquivalentModifierMask:(NSAlternateKeyMask|NSCommandKeyMask)];
+
+    [appleMenu addItemWithTitle:[NSString stringWithUTF8String:gettext("Show All")] action:@selector(unhideAllApplications:) keyEquivalent:@""];
+
+    [appleMenu addItem:[NSMenuItem separatorItem]];
+
+    title = [NSString stringWithUTF8String:gettext("Quit Tux Paint")];
+    [appleMenu addItemWithTitle:title action:@selector(terminate:) keyEquivalent:@"q"];
+
+
+    /* Put menu into the menubar */
+    menuItem = [[NSMenuItem alloc] initWithTitle:@"" action:nil keyEquivalent:@""];
+    [menuItem setSubmenu:appleMenu];
+    [[NSApp mainMenu] addItem:menuItem];
+
+    /* Tell the application object that this is now the application menu */
+    [NSApp setAppleMenu:appleMenu];
+
+    /* Finally give up our references to the objects */
+    [appleMenu release];
+    [menuItem release];
+}
+
+
+static void setupWindowMenu(void)
+{
+    /*
+    * Forked from SDLMain.m that comes with the SDL source code that comes with
+    * MacPorts.  Credits to Darrell Walisser <dwaliss1@purdue.edu> and Max Horn
+    * <max@quendi.de>.
+    */
+
+    NSMenu      *windowMenu;
+    NSMenuItem  *windowMenuItem;
+    NSMenuItem  *menuItem;
+
+    windowMenu = [[NSMenu alloc] initWithTitle:[NSString stringWithUTF8String:gettext("Window")]];
+
+    /* "Minimize" item */
+    menuItem = [[NSMenuItem alloc] initWithTitle:[NSString stringWithUTF8String:gettext("Minimize")] action:@selector(performMiniaturize:) keyEquivalent:@"m"];
+    [windowMenu addItem:menuItem];
+    [menuItem release];
+
+    /* Put menu into the menubar */
+    windowMenuItem = [[NSMenuItem alloc] initWithTitle:[NSString stringWithUTF8String:gettext("Window")] action:nil keyEquivalent:@""];
+    [windowMenuItem setSubmenu:windowMenu];
+    [[NSApp mainMenu] addItem:windowMenuItem];
+
+    /* Tell the application object that this is now the window menu */
+    [NSApp setWindowsMenu:windowMenu];
+
+    /* Finally give up our references to the objects */
+    [windowMenu release];
+    [windowMenuItem release];
+}
+
+
+static void removeSdlMenu(void)
+{
+    NSMenu* rootMenu = [NSApp mainMenu];
+
+    /* SDL has two menus. Remove both. */
+
+    [rootMenu removeItemAtIndex:0];
+    [rootMenu removeItemAtIndex:0];
+}
+
+
+void apple_init(void)
+{
+    /* Override SDL's default menu with our gettext-translatable menu.  We do
+     * this by adding our menus, then removing the menus installed by SDL. */
+    setupApplicationMenu();
+    setupWindowMenu();
+    removeSdlMenu();
+}

src/tuxpaint.c

@@ -25971,6 +25971,10 @@ static void setup(void)
     }
 #endif
 
+#ifdef __APPLE__
+  apple_init();
+#endif
+
   im_init(&im_data, get_current_language());
 
 #ifndef NO_SDLPANGO