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First pass at doing an embedded iTerm2, based off lemonmojo's PR gnachman#366 (gnachman#366). A key difference between lemonmojo's approach and this approach is instead of adding a iTerm2Lib target to the iTerm2 project, I've created an iTerm2Lib project and referenced iTerm2 as a sub-project, thus not requiring any modification to the iTerm2 project.
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embed/iTerm2Lib.xcodeproj/project.pbxproj

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embed/iTerm2Lib.xcodeproj/project.xcworkspace/contents.xcworkspacedata

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>IDEDidComputeMac32BitWarning</key>
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<true/>
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</dict>
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</plist>
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>SchemeUserState</key>
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<dict>
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<key>iTerm2Lib.xcscheme_^#shared#^_</key>
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<dict>
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<key>orderHint</key>
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<integer>3</integer>
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</dict>
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</dict>
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</dict>
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</plist>

embed/iTerm2Lib/Info.plist

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>CFBundleDevelopmentRegion</key>
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<string>$(DEVELOPMENT_LANGUAGE)</string>
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<key>CFBundleExecutable</key>
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<string>$(EXECUTABLE_NAME)</string>
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<key>CFBundleIdentifier</key>
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<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
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<key>CFBundleInfoDictionaryVersion</key>
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<string>6.0</string>
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<key>CFBundleName</key>
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<string>$(PRODUCT_NAME)</string>
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<key>CFBundlePackageType</key>
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<string>FMWK</string>
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<key>CFBundleShortVersionString</key>
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<string>1.0</string>
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<key>CFBundleVersion</key>
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<string>$(CURRENT_PROJECT_VERSION)</string>
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</dict>
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</plist>

embed/iTerm2Lib/NSWindow+iTermLib.h

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#import <Cocoa/Cocoa.h>
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@interface NSWindow (iTermLib)
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- (double)approximateFractionOccluded;
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@end

embed/iTerm2Lib/NSWindow+iTermLib.m

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#import "NSWindow+iTermLib.h"
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@implementation NSWindow (iTermLib)
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- (double)approximateFractionOccluded
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{
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return 0;
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}
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@end
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#import <Cocoa/Cocoa.h>
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#import "SessionView.h"
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extern NSString* const iTermLibSessionViewDidMoveToWindowNotification;
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@interface SessionView (iTermLib)
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@end
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#import "SessionView+iTermLib.h"
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NSString* const iTermLibSessionViewDidMoveToWindowNotification = @"iTermLibSessionViewDidMoveToWindowNotification";
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@implementation SessionView (iTermLib)
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- (void)viewDidMoveToWindow
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{
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[NSNotificationCenter.defaultCenter postNotificationName:iTermLibSessionViewDidMoveToWindowNotification object:self];
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}
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@end

embed/iTerm2Lib/iTerm2Lib.h

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#import <Cocoa/Cocoa.h>
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#import "iTermLibApplication.h"
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#import "iTermLibController.h"
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#import "iTermLibSessionController.h"
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#import "SessionView+iTermLib.h"
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#import "NSWindow+iTermLib.h"
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embed/iTerm2Lib/iTermLibApplication.h

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#import <Cocoa/Cocoa.h>
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@class iTermLibController;
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@interface iTermLibApplication : NSObject
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+ (instancetype)sharedApplication;
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@property (readonly) iTermLibController *delegate;
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@end

embed/iTerm2Lib/iTermLibApplication.m

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#import "iTermLibApplication.h"
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#import "iTermLibController.h"
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static iTermLibApplication* _gSharedApplication;
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@implementation iTermLibApplication
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+ (instancetype)sharedApplication
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{
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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_gSharedApplication = [[iTermLibApplication alloc] init];
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});
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return _gSharedApplication;
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}
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- (iTermLibController*)delegate
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{
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return iTermLibController.sharedController;
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}
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@end

embed/iTerm2Lib/iTermLibController.h

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#import <Cocoa/Cocoa.h>
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#import "iTermLibSessionController.h"
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@class PTYSession;
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@class iTermLibController;
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@protocol iTermLibControllerDelegate<NSObject>
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- (void)controller:(iTermLibController*)controller shouldRemoveSessionView:(iTermLibSessionController*)session;
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@optional
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- (void)controller:(iTermLibController*)controller sessionDidClose:(iTermLibSessionController*)session;
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- (void)controller:(iTermLibController*)controller nameOfSession:(iTermLibSessionController*)session didChangeTo:(NSString*)newName;
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@end
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@interface iTermLibController : NSObject<iTermLibSessionDelegate>
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+ (instancetype)sharedController;
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@property (readonly, copy) NSArray<iTermLibSessionController*>* sessions;
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@property (readonly) iTermLibSessionController* activeSession;
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@property (assign) id<iTermLibControllerDelegate> delegate;
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@property (assign) BOOL broadcasting;
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- (iTermLibSessionController*)createSessionWithProfile:(Profile*)profile command:(NSString*)command initialSize:(NSSize)initialSize;
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@end

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