Fix file associations in macOS.

premake4.lua

@@ -593,6 +593,10 @@ function build_link_configuration( package_name, use_ee_icon )
 		end
 	end
 
+	if os.is_real("macosx") then
+		linkoptions { "-weak_framework UniformTypeIdentifiers" }
+	end
+
 	if _OPTIONS["with-mold-linker"] then
 		if _OPTIONS.platform == "clang" or _OPTIONS.platform == "clang-analyzer" then
 			linkoptions { "-fuse-ld=mold" }
@@ -1644,7 +1648,8 @@ solution "eepp"
 		set_targetdir("libs/" .. os.get_real() .. "/")
 		includedirs { "include", "src" }
 		files { "src/eepp/ui/platform/macos/macosmenubar.mm",
-				"src/eepp/window/platform/macos/platformhelper.mm" }
+				"src/eepp/window/platform/macos/platformhelper.mm",
+				"src/eepp/system/fileassociation_macos.mm" }
 		buildoptions { "-x objective-c++" }
 		if not is_vs() then
 			buildoptions{ "-std=c++20" }

premake5.lua

@@ -538,6 +538,9 @@ function build_link_configuration( package_name, use_ee_icon )
 			linkoptions { "-Wl,-rpath,'$$ORIGIN'" }
 		end
 
+	filter "system:macosx"
+		linkoptions { "-weak_framework UniformTypeIdentifiers" }
+
 	filter { "system:bsd" }
 		if package_name ~= "eepp" and package_name ~= "eepp-static" then
 			if type(userelativelinks) == "function" then
@@ -1675,7 +1678,8 @@ workspace "eepp"
 		cppdialect "C++20"
 		incdirs { "include", "src" }
 		files { "src/eepp/ui/platform/macos/macosmenubar.mm",
-				"src/eepp/window/platform/macos/platformhelper.mm" }
+				"src/eepp/window/platform/macos/platformhelper.mm",
+				"src/eepp/system/fileassociation_macos.mm" }
 		buildoptions { "-x objective-c++" }
 		build_base_cpp_configuration( "eepp-macos-helper" )
 		target_dir_lib( "" )

src/eepp/system/fileassociation.cpp

@@ -21,6 +21,10 @@
 #include <CoreServices/CoreServices.h>
 #endif
 
+#if EE_PLATFORM == EE_PLATFORM_MACOS
+extern "C" CFStringRef eeppFileAssociationTypeIdentifierForExtension( const char* extension );
+#endif
+
 namespace EE::System {
 
 namespace {
@@ -557,11 +561,19 @@ static CFStringRef cfString( const std::string& value ) {
 }
 
 static CFStringRef typeForExtension( const std::string& extension ) {
-	CFRef extensionString( cfString( extension ) );
-	if ( !extensionString.get() )
-		return nullptr;
-	return UTTypeCreatePreferredIdentifierForTag(
-		kUTTagClassFilenameExtension, static_cast<CFStringRef>( extensionString.get() ), nullptr );
+	return eeppFileAssociationTypeIdentifierForExtension( extension.c_str() );
+}
+
+static CFStringRef applicationIdentifier( const FileAssociationApplication& application ) {
+	/* Launch Services uses the bundle identifier from the registered bundle. The cross-platform
+	 * application id is not necessarily that identifier (ecode, for example, uses ensoft.dev in
+	 * its macOS Info.plist). Prefer the bundle metadata when this process is running from a bundle,
+	 * and retain the supplied id as a fallback for non-bundled callers. */
+	if ( auto* bundle = CFBundleGetMainBundle() ) {
+		if ( auto identifier = CFBundleGetIdentifier( bundle ) )
+			return static_cast<CFStringRef>( CFRetain( identifier ) );
+	}
+	return cfString( application.id );
 }
 
 #endif
@@ -621,7 +633,7 @@ std::vector<std::string> FileAssociation::getRegisteredExtensions(
 			registered.emplace_back( extension );
 	}
 #elif EE_PLATFORM == EE_PLATFORM_MACOS
-	CFRef applicationId( cfString( mApplication.id ) );
+	CFRef applicationId( applicationIdentifier( mApplication ) );
 	if ( !applicationId.get() ) {
 		mLastError = "The application identifier is not valid UTF-8.";
 		return {};
@@ -656,7 +668,7 @@ bool FileAssociation::setRegisteredExtensions( const std::vector<std::string>& r
 	const auto supported = normalizeExtensions( supportedExtensions );
 	const auto requested = normalizeExtensions( registeredExtensions );
 	std::vector<std::string> selected;
-	selected.reserve( (std::min)( requested.size(), supported.size() ) );
+	selected.reserve( ( std::min )( requested.size(), supported.size() ) );
 	std::set_intersection( requested.begin(), requested.end(), supported.begin(), supported.end(),
 						   std::back_inserter( selected ) );
 #if EE_PLATFORM == EE_PLATFORM_LINUX || EE_PLATFORM == EE_PLATFORM_BSD
@@ -712,7 +724,7 @@ bool FileAssociation::setRegisteredExtensions( const std::vector<std::string>& r
 		mLastError = "Launch Services could not register the application bundle.";
 		return false;
 	}
-	CFRef applicationId( cfString( mApplication.id ) );
+	CFRef applicationId( applicationIdentifier( mApplication ) );
 	if ( !applicationId.get() ) {
 		mLastError = "The application identifier is not valid UTF-8.";
 		return false;

src/eepp/system/fileassociation_macos.mm

@@ -0,0 +1,33 @@
+#include <eepp/config.hpp>
+
+#if EE_PLATFORM == EE_PLATFORM_MACOS
+
+#import <CoreServices/CoreServices.h>
+#import <Foundation/Foundation.h>
+#import <UniformTypeIdentifiers/UniformTypeIdentifiers.h>
+
+extern "C" CFStringRef eeppFileAssociationTypeIdentifierForExtension( const char* extension ) {
+	if ( extension == nullptr )
+		return nullptr;
+
+	NSString* extensionString = [NSString stringWithUTF8String:extension];
+	if ( extensionString == nil )
+		return nullptr;
+
+	if ( @available( macOS 11.0, * ) ) {
+		UTType* type = [UTType typeWithFilenameExtension:extensionString];
+		if ( type == nil || type.identifier == nil )
+			return nullptr;
+		return CFStringCreateWithCString( kCFAllocatorDefault, type.identifier.UTF8String,
+										  kCFStringEncodingUTF8 );
+	}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+	CFStringRef type = UTTypeCreatePreferredIdentifierForTag(
+		kUTTagClassFilenameExtension, static_cast<CFStringRef>( extensionString ), nullptr );
+#pragma clang diagnostic pop
+	return type;
+}
+
+#endif