Add "Start at login" checkbox that [un]installs launch agent

A new checkbox in the UI that asks whether the app should start at
login. Checking and unchecking the box moves a LaunchAgent plist into
and out of `~/Library/LaunchAgents/`. This plist file will define
instructions to start the daemon on login.

Also add a `DaemonLauncher` class that will launch or quit the daemon
when the checkbox is clicked.

Bug:
Currently the app always starts with the checkbox checked. That's not
what should happen. Instead, we should save the checkbox value to
`NSUserDefaults` so that it has the previous value when the program is
launched.

1 files changed, 20 insertions, 0 deletions

diff --git a/Low Battery Yup/LaunchAgentManager.h b/Low Battery Yup/LaunchAgentManager.h
new file mode 100644
index 0000000..5a9fa44
--- /dev/null
+++ b/Low Battery Yup/LaunchAgentManager.h
@@ -0,0 +1,20 @@
+//
+//  LaunchAgentManager.h
+//  Low Battery Yup.d
+//
+//  Created by TW on 12/2/16.
+//  Copyright (c) 2016 TW. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+#define LAUNCH_AGENTS_PATH @"~/Library/LaunchAgents"
+
+@interface LaunchAgentManager : NSObject {
+	NSFileManager *_file_manager;
+}
+
+- (BOOL)install;
+- (BOOL)uninstall;
+
+@end