A simple hotkey program that allows you to set a specified hotkey, minimize the program to your system tray, and press said hotkey while in Garry's Mod to automatically start recording a demo. This program will automatically create a directory for the demo to be stored in based off of the date.
Go to your Garry's Mod directory, then go to demos/ahg. Once in that folder, you can enter each directory in the following order {year}/{month}/{day}/{hour}. Each demo file name is in {Hour}-{Minute}-{Second}.dem format.
NotifyIcon - https://github.com/hardcodet/wpf-notifyicon
InputSimulator - https://github.com/HavenDV/H.InputSimulator