WARNING: Use at your own discretion. I take no responsibility if anything should happen to your machine while testing or otherwise trying to install this extension.
I have confirmed this to be working on my machine running MacOS El Capitan (10.11.6), Sierra (10.12.6) and High Sierra (10.13.0) with the below instructions. (Features that interact with spaces only work on High Sierra)
CHWMInjector.osax is our scripting addition.
The main executable in CHWMInjector.osax is sa_core, placed in CHWMInjector.osax/Contents/MacOS/.
The payload is payload_test and is placed in CHWMInjector.osax/Contents/Resources/.
Use inject_test to remotely load our scripting addition into a target application.
Build CHWMInjector.osax by running the build.sh script in the root folder.
Reboot into recovery mode and disable SIP (System Integrity Protection)
csrutil disable
Copy the generated CHWMInjector.osax to /System/Library/ScriptingAdditions/.
Reboot into recovery mode and enable SIP.
csrutil enable
Build and run inject_test to load the scripting addition bundle into the Dock.
The Dock will now spawn a local unix domain socket and starts listening on port 5050.
To set window alpha, send: window_alpha <cgwindowid> <alpha>
To fade into window alpha, send: window_alpha_fade <cgwindowid> <alpha> <duration>
To set window level, send: window_level <cgwindowid> <kCGWindowLevelKey>
To set window sticky (show on all spaces), send: window_sticky <cgwindowid> <1 | 0>
To set window position, send: window_move <cgwindowid> <x> <y>
To set window shadow, send: window_shadow <cgwindowid> <1 | 0>
To switch to a different space, bypassing animation, send: space <cgsspaceid>
To create a new space on the active display, send: space_create <focused_cgsspaceid_of_a_display>
To destroy the active space, send: space_destroy <focused_cgsspaceid_of_a_display>