Set Custom KeyEquivalent in Services Menu - objective-c

Question

OmniFocus has a Cocoa Service that allows you to create tasks based upon selected items.
It has a preference that allows you to set the keyboard shortcut that triggers the Service. This is not just a global hotkey, it's a bona fide Service that shows up in the menu.
You can the keyboard shortcut to pretty much any combination, including combinations with ⌥ and ^. This functionality is not documented - the docs seem to say that KeyEquivalents must be a ⌘+[⇧]+someKey.
Once this is set, I observe three things:
The OmniFocus Info.plist file does not contain a KeyEquivalent listed. This is not surprising, as the file is read-only.
The pbs -dump_pboard utility lists NSKeyEquivalent = {}; for the service.
Using NSDebugServices lists this interesting line that does not show up with most debugging sessions (Obviously, for keyboard shortcut ⌃⌥⌘M): OmniFocus: Send to Inbox (com.omnigroup.OmniFocus) has a custom key equivalent: <NSKeyboardShortcut: 0x7fb18a0d18f0 (⌃⌥⌘M)>.
So my questions are twofold, and I suspect they are related:
How do you dynamically change a service's KeyEquivalent?
How do you set the KeyEquivalent to a combination including ⌃ and ⌥
Thank you!

Answer 1

Figured it out. The basic process is described here: Register NSService with Command Alt NSKeyEquivalent
The code is this:
//Bundle identifier from Info.plist
NSString* bundleIdentifier = #"com.whatever.MyApp";
//Services -> Menu -> Menu item title from Info.plist
NSString* appServiceName = #"Launch My Service";
//Services -> Instance method name from Info.plist
NSString* methodNameForService = #"myServiceMethod";
//The key equivalent
NSString* keyEquivalent = #"#~r";
CFStringRef serviceStatusName = (CFStringRef)[NSString stringWithFormat:#"%# - %# - %#", bundleIdentifier, appServiceName, methodNameForService];
CFStringRef serviceStatusRoot = CFSTR("NSServicesStatus");
CFPropertyListRef pbsAllServices = (CFPropertyListRef) CFMakeCollectable ( CFPreferencesCopyAppValue(serviceStatusRoot, CFSTR("pbs")) );
// the user did not configure any custom services
BOOL otherServicesDefined = pbsAllServices != NULL;
BOOL ourServiceDefined = NO;
if ( otherServicesDefined ) {
ourServiceDefined = NULL != CFDictionaryGetValue((CFDictionaryRef)pbsAllServices, serviceStatusName);
}
NSUpdateDynamicServices();
NSMutableDictionary *pbsAllServicesNew = nil;
if (otherServicesDefined) {
pbsAllServicesNew = [NSMutableDictionary dictionaryWithDictionary:(NSDictionary*)pbsAllServices];
} else {
pbsAllServicesNew = [NSMutableDictionary dictionaryWithCapacity:1];
}
NSDictionary *serviceStatus = [NSDictionary dictionaryWithObjectsAndKeys:
(id)kCFBooleanTrue, #"enabled_context_menu",
(id)kCFBooleanTrue, #"enabled_services_menu",
keyEquivalent, #"key_equivalent", nil];
[pbsAllServicesNew setObject:serviceStatus forKey:(NSString*)serviceStatusName];
CFPreferencesSetAppValue (
serviceStatusRoot,
(CFPropertyListRef) pbsAllServicesNew,
CFSTR("pbs"));
Boolean result = CFPreferencesAppSynchronize(CFSTR("pbs"));
if (result) {
NSUpdateDynamicServices();
NSLog(#"successfully installed our alt-command-r service");
} else {
NSLog(#"couldn't install our alt-command-r service");
}
If the code succeeds, you can view this in ~/Library/Preferences/pbs.plist
You should see something like:
NSServicesStatus = {
"com.whatever.MyApp - Launch My Service - myServiceMethod" = {
enabled_context_menu = :true;
enabled_services_menu = :true;
key_equivalent = "#~r";
};