macOS: Add Open with kitty Service

There are still some file types that cannot be matched.
Add a standalone Open With service.
Users can configure shortcut for this service in System Preferences.

kitty/cocoa_window.m

@@ -520,6 +520,19 @@ cocoa_send_notification(PyObject *self UNUSED, PyObject *args) {
     return YES;
 }
 
+- (BOOL)openFileURLs:(NSPasteboard*)pasteboard
+        userData:(NSString *) UNUSED userData  error:(NSError **) UNUSED error {
+    NSDictionary *options = @{ NSPasteboardURLReadingFileURLsOnlyKey: @YES };
+    NSArray *urlArray = [pasteboard readObjectsForClasses:[NSArray arrayWithObject:[NSURL class]] options:options];
+    for (NSURL *url in urlArray) {
+        NSString *path = [url path];
+        if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
+            set_cocoa_pending_action(LAUNCH_URL, [[[NSURL fileURLWithPath:path] absoluteString] UTF8String]);
+        }
+    }
+    return YES;
+}
+
 @end
 
 // global menu {{{

setup.py

@@ -1090,6 +1090,12 @@ def macos_info_plist() -> bytes:
             'NSRequiredContext': {'NSTextContent': 'FilePath'},
             'NSSendTypes': ['NSFilenamesPboardType', 'public.plain-text'],
         },
+        {
+            'NSMenuItem': {'default': f'Open with {appname}'},
+            'NSMessage': 'openFileURLs',
+            'NSRequiredContext': {'NSTextContent': 'FilePath'},
+            'NSSendTypes': ['NSFilenamesPboardType', 'public.plain-text'],
+        },
     ]
 
     pl = dict(