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.

9 files changed, 165 insertions, 2 deletions

diff --git a/Low Battery Yup.d.xcodeproj/project.pbxproj b/Low Battery Yup.d.xcodeproj/project.pbxproj
index f1c9910..b625f3b 100644
--- a/Low Battery Yup.d.xcodeproj/project.pbxproj
+++ b/Low Battery Yup.d.xcodeproj/project.pbxproj
@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		D123F5A81DDF9D2400A27B7A /* DDHotKeyCenter.m in Sources */ = {isa = PBXBuildFile; fileRef = D123F5A71DDF9D2400A27B7A /* DDHotKeyCenter.m */; settings = {COMPILER_FLAGS = "-fobjc-arc"; }; };
+		D131EB381DF1E8AB00504A74 /* com.teddywing.Low-Battery-Yup.StartAtLogin.plist in Resources */ = {isa = PBXBuildFile; fileRef = D131EB371DF1E8AB00504A74 /* com.teddywing.Low-Battery-Yup.StartAtLogin.plist */; };
 		D15D90B71DF0465E001700CD /* ShortcutView.m in Sources */ = {isa = PBXBuildFile; fileRef = D15D90B61DF0465E001700CD /* ShortcutView.m */; };
 		D1871D071DE094AB00B8030D /* DDHotKeyTextField.m in Sources */ = {isa = PBXBuildFile; fileRef = D1871D061DE094AB00B8030D /* DDHotKeyTextField.m */; settings = {COMPILER_FLAGS = "-fobjc-arc"; }; };
 		D1871D081DE094C200B8030D /* DDHotKeyUtilities.m in Sources */ = {isa = PBXBuildFile; fileRef = D1A37AF01DE001770022434D /* DDHotKeyUtilities.m */; settings = {COMPILER_FLAGS = "-fobjc-arc"; }; };
@@ -21,6 +22,8 @@
 		D18C94C51DDC355400E03F87 /* Mouse.m in Sources */ = {isa = PBXBuildFile; fileRef = D18C94C41DDC355400E03F87 /* Mouse.m */; };
 		D195AE5F1DDC776000A53A18 /* MASShortcut.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = D195AE5A1DDC774300A53A18 /* MASShortcut.framework */; };
 		D195AE601DDC776F00A53A18 /* MASShortcut.framework in Resources */ = {isa = PBXBuildFile; fileRef = D195AE5A1DDC774300A53A18 /* MASShortcut.framework */; };
+		D19DF20F1DF1AD3D0094C50F /* LaunchAgentManager.m in Sources */ = {isa = PBXBuildFile; fileRef = D19DF20E1DF1AD3D0094C50F /* LaunchAgentManager.m */; };
+		D19DF2121DF1AD480094C50F /* DaemonLauncher.m in Sources */ = {isa = PBXBuildFile; fileRef = D19DF2111DF1AD480094C50F /* DaemonLauncher.m */; };
 		D1A37AEE1DE0012C0022434D /* Carbon.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = D1A37AED1DE0012C0022434D /* Carbon.framework */; };
 		D1A37AF11DE001770022434D /* DDHotKeyUtilities.m in Sources */ = {isa = PBXBuildFile; fileRef = D1A37AF01DE001770022434D /* DDHotKeyUtilities.m */; settings = {COMPILER_FLAGS = "-fobjc-arc"; }; };
 		D1F809E11DDC6AA0001671E9 /* Cocoa.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = D18C94A21DDC33CF00E03F87 /* Cocoa.framework */; };
@@ -58,6 +61,7 @@
 /* Begin PBXFileReference section */
 		D123F5A61DDF9D2400A27B7A /* DDHotKeyCenter.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = DDHotKeyCenter.h; path = DDHotKey/DDHotKeyCenter.h; sourceTree = "<group>"; };
 		D123F5A71DDF9D2400A27B7A /* DDHotKeyCenter.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = DDHotKeyCenter.m; path = DDHotKey/DDHotKeyCenter.m; sourceTree = "<group>"; };
+		D131EB371DF1E8AB00504A74 /* com.teddywing.Low-Battery-Yup.StartAtLogin.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = "com.teddywing.Low-Battery-Yup.StartAtLogin.plist"; sourceTree = "<group>"; };
 		D15D90B51DF0465E001700CD /* ShortcutView.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ShortcutView.h; sourceTree = "<group>"; };
 		D15D90B61DF0465E001700CD /* ShortcutView.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ShortcutView.m; sourceTree = "<group>"; };
 		D1871D051DE094AB00B8030D /* DDHotKeyTextField.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = DDHotKeyTextField.h; path = DDHotKey/DDHotKeyTextField.h; sourceTree = "<group>"; };
@@ -78,6 +82,10 @@
 		D18C94C41DDC355400E03F87 /* Mouse.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = Mouse.m; sourceTree = "<group>"; };
 		D195AE4F1DDC774200A53A18 /* MASShortcut.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = MASShortcut.xcodeproj; path = MASShortcut/MASShortcut.xcodeproj; sourceTree = "<group>"; };
 		D19DF1F41DF09CF30094C50F /* Constants.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Constants.h; sourceTree = "<group>"; };
+		D19DF20D1DF1AD3D0094C50F /* LaunchAgentManager.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = LaunchAgentManager.h; sourceTree = "<group>"; };
+		D19DF20E1DF1AD3D0094C50F /* LaunchAgentManager.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = LaunchAgentManager.m; sourceTree = "<group>"; };
+		D19DF2101DF1AD480094C50F /* DaemonLauncher.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = DaemonLauncher.h; sourceTree = "<group>"; };
+		D19DF2111DF1AD480094C50F /* DaemonLauncher.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = DaemonLauncher.m; sourceTree = "<group>"; };
 		D1A37AED1DE0012C0022434D /* Carbon.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Carbon.framework; path = System/Library/Frameworks/Carbon.framework; sourceTree = SDKROOT; };
 		D1A37AEF1DE001770022434D /* DDHotKeyUtilities.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = DDHotKeyUtilities.h; path = DDHotKey/DDHotKeyUtilities.h; sourceTree = "<group>"; };
 		D1A37AF01DE001770022434D /* DDHotKeyUtilities.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = DDHotKeyUtilities.m; path = DDHotKey/DDHotKeyUtilities.m; sourceTree = "<group>"; };
@@ -207,6 +215,10 @@
 				D195AE4F1DDC774200A53A18 /* MASShortcut.xcodeproj */,
 				D1F809EE1DDC6AA0001671E9 /* AppDelegate.h */,
 				D1F809EF1DDC6AA0001671E9 /* AppDelegate.m */,
+				D19DF20D1DF1AD3D0094C50F /* LaunchAgentManager.h */,
+				D19DF20E1DF1AD3D0094C50F /* LaunchAgentManager.m */,
+				D19DF2101DF1AD480094C50F /* DaemonLauncher.h */,
+				D19DF2111DF1AD480094C50F /* DaemonLauncher.m */,
 				D19DF1F41DF09CF30094C50F /* Constants.h */,
 				D15D90B51DF0465E001700CD /* ShortcutView.h */,
 				D15D90B61DF0465E001700CD /* ShortcutView.m */,
@@ -224,6 +236,7 @@
 				D1F809E81DDC6AA0001671E9 /* main.m */,
 				D1F809EA1DDC6AA0001671E9 /* Low Battery Yup-Prefix.pch */,
 				D1F809EB1DDC6AA0001671E9 /* Credits.rtf */,
+				D131EB371DF1E8AB00504A74 /* com.teddywing.Low-Battery-Yup.StartAtLogin.plist */,
 			);
 			name = "Supporting Files";
 			sourceTree = "<group>";
@@ -346,6 +359,7 @@
 				D1F809ED1DDC6AA0001671E9 /* Credits.rtf in Resources */,
 				D1F809F31DDC6AA0001671E9 /* MainMenu.xib in Resources */,
 				D195AE601DDC776F00A53A18 /* MASShortcut.framework in Resources */,
+				D131EB381DF1E8AB00504A74 /* com.teddywing.Low-Battery-Yup.StartAtLogin.plist in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -374,6 +388,8 @@
 				D1871D081DE094C200B8030D /* DDHotKeyUtilities.m in Sources */,
 				D1871D091DE0955E00B8030D /* DDHotKeyCenter.m in Sources */,
 				D15D90B71DF0465E001700CD /* ShortcutView.m in Sources */,
+				D19DF20F1DF1AD3D0094C50F /* LaunchAgentManager.m in Sources */,
+				D19DF2121DF1AD480094C50F /* DaemonLauncher.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
diff --git a/Low Battery Yup/AppDelegate.h b/Low Battery Yup/AppDelegate.h
index cc38038..4ae3e9c 100644
--- a/Low Battery Yup/AppDelegate.h
+++ b/Low Battery Yup/AppDelegate.h
@@ -9,13 +9,17 @@
 #import <Cocoa/Cocoa.h>
 #import <MASShortcut/MASShortcut.h>
 #import "ShortcutView.h"
+#import "LaunchAgentManager.h"
 
 @interface AppDelegate : NSObject <NSApplicationDelegate> {
 	IBOutlet NSWindow *window;
 	IBOutlet ShortcutView *_shortcut_view;
 	IBOutlet NSButton *_start_at_login;
+
+	LaunchAgentManager *_launchagent;
 }
 
 - (void)initializeShortcutView;
+- (IBAction)performStartAtLogin:(id)sender;
 
 @end
diff --git a/Low Battery Yup/AppDelegate.m b/Low Battery Yup/AppDelegate.m
index 1c77f41..365b1bf 100644
--- a/Low Battery Yup/AppDelegate.m
+++ b/Low Battery Yup/AppDelegate.m
@@ -11,14 +11,25 @@
 
 @implementation AppDelegate
 
+- (id)init
+{
+    self = [super init];
+    if (self) {
+        _launchagent = [[LaunchAgentManager alloc] init];
+    }
+    return self;
+}
+
 - (void)dealloc
 {
+	[_launchagent release];
     [super dealloc];
 }
 
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification
 {
 	[self initializeShortcutView];
+	[self performStartAtLogin:self];
 }
 
 - (void)initializeShortcutView
@@ -33,6 +44,16 @@
 	}
 }
 
+- (IBAction)performStartAtLogin:(id)sender
+{
+	if ([_start_at_login state] == NSOnState) {
+		[_launchagent install];
+	}
+	else {
+		[_launchagent uninstall];
+	}
+}
+
 - (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication
 {
 	return YES;
diff --git a/Low Battery Yup/DaemonLauncher.h b/Low Battery Yup/DaemonLauncher.h
new file mode 100644
index 0000000..a62a256
--- /dev/null
+++ b/Low Battery Yup/DaemonLauncher.h
@@ -0,0 +1,13 @@
+//
+//  DaemonLauncher.h
+//  Low Battery Yup.d
+//
+//  Created by TW on 12/2/16.
+//  Copyright (c) 2016 TW. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface DaemonLauncher : NSObject
+
+@end
diff --git a/Low Battery Yup/DaemonLauncher.m b/Low Battery Yup/DaemonLauncher.m
new file mode 100644
index 0000000..4c6449c
--- /dev/null
+++ b/Low Battery Yup/DaemonLauncher.m
@@ -0,0 +1,13 @@
+//
+//  DaemonLauncher.m
+//  Low Battery Yup.d
+//
+//  Created by TW on 12/2/16.
+//  Copyright (c) 2016 TW. All rights reserved.
+//
+
+#import "DaemonLauncher.h"
+
+@implementation DaemonLauncher
+
+@end
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
diff --git a/Low Battery Yup/LaunchAgentManager.m b/Low Battery Yup/LaunchAgentManager.m
new file mode 100644
index 0000000..fd75795
--- /dev/null
+++ b/Low Battery Yup/LaunchAgentManager.m
@@ -0,0 +1,52 @@
+//
+//  LaunchAgentManager.m
+//  Low Battery Yup.d
+//
+//  Created by TW on 12/2/16.
+//  Copyright (c) 2016 TW. All rights reserved.
+//
+
+#import "LaunchAgentManager.h"
+
+@implementation LaunchAgentManager
+
+- (id)init
+{
+    self = [super init];
+    if (self) {
+        _file_manager = [NSFileManager defaultManager];
+    }
+    return self;
+}
+
+- (BOOL)install
+{
+	NSBundle *main_bundle = [NSBundle mainBundle];
+	NSURL *launchagents_url = [NSURL fileURLWithPath:
+		[[LAUNCH_AGENTS_PATH stringByAppendingString:@"/com.teddywing.Low-Battery-Yup.StartAtLogin.plist"] stringByExpandingTildeInPath]
+		isDirectory:YES];
+
+	NSError *error;
+	BOOL success = [_file_manager copyItemAtURL:
+			[main_bundle URLForResource:@"com.teddywing.Low-Battery-Yup.StartAtLogin" withExtension:@"plist"]
+		toURL:launchagents_url
+		error:&error];
+
+	if (!success) {
+		NSLog(@"%@", error);
+	}
+
+	return success;
+}
+
+- (BOOL)uninstall
+{
+	return [[NSWorkspace sharedWorkspace]
+		performFileOperation:NSWorkspaceRecycleOperation
+		source:[LAUNCH_AGENTS_PATH stringByExpandingTildeInPath]
+		destination:@""
+		files:[NSArray arrayWithObject:@"com.teddywing.Low-Battery-Yup.StartAtLogin.plist"]
+		tag:nil];
+}
+
+@end
diff --git a/Low Battery Yup/com.teddywing.Low-Battery-Yup.StartAtLogin.plist b/Low Battery Yup/com.teddywing.Low-Battery-Yup.StartAtLogin.plist
new file mode 100644
index 0000000..0c67376
--- /dev/null
+++ b/Low Battery Yup/com.teddywing.Low-Battery-Yup.StartAtLogin.plist
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict/>
+</plist>
diff --git a/Low Battery Yup/en.lproj/MainMenu.xib b/Low Battery Yup/en.lproj/MainMenu.xib
index e649cab..5e48c4e 100644
--- a/Low Battery Yup/en.lproj/MainMenu.xib
+++ b/Low Battery Yup/en.lproj/MainMenu.xib
@@ -1358,7 +1358,7 @@
 					<reference key="NSWindow"/>
 					<reference key="NSNextKeyView" ref="489226571"/>
 				</object>
-				<string key="NSScreenRect">{{0, 0}, {2560, 1578}}</string>
+				<string key="NSScreenRect">{{0, 0}, {1440, 878}}</string>
 				<string key="NSMinSize">{480, 207}</string>
 				<string key="NSMaxSize">{480, 207}</string>
 				<bool key="NSWindowIsRestorable">YES</bool>
@@ -2068,6 +2068,14 @@
 					</object>
 					<int key="connectionID">544</int>
 				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBActionConnection" key="connection">
+						<string key="label">performStartAtLogin:</string>
+						<reference key="source" ref="976324537"/>
+						<reference key="destination" ref="1065652370"/>
+					</object>
+					<int key="connectionID">545</int>
+				</object>
 			</array>
 			<object class="IBMutableOrderedSet" key="objectRecords">
 				<array key="orderedObjects">
@@ -3256,13 +3264,24 @@
 			<nil key="activeLocalization"/>
 			<dictionary class="NSMutableDictionary" key="localizations"/>
 			<nil key="sourceID"/>
-			<int key="maxID">544</int>
+			<int key="maxID">545</int>
 		</object>
 		<object class="IBClassDescriber" key="IBDocument.Classes">
 			<array class="NSMutableArray" key="referencedPartialClassDescriptions">
 				<object class="IBPartialClassDescription">
 					<string key="className">AppDelegate</string>
 					<string key="superclassName">NSObject</string>
+					<object class="NSMutableDictionary" key="actions">
+						<string key="NS.key.0">performStartAtLogin:</string>
+						<string key="NS.object.0">id</string>
+					</object>
+					<object class="NSMutableDictionary" key="actionInfosByName">
+						<string key="NS.key.0">performStartAtLogin:</string>
+						<object class="IBActionInfo" key="NS.object.0">
+							<string key="name">performStartAtLogin:</string>
+							<string key="candidateClassName">id</string>
+						</object>
+					</object>
 					<dictionary class="NSMutableDictionary" key="outlets">
 						<string key="_shortcut_view">ShortcutView</string>
 						<string key="_start_at_login">NSButton</string>