Press-to-halt program for headless Raspberry Pi. Similar functionality to the rpi_power_switch kernel module from the fbtft project, but easier to compile (no kernel headers needed).
I made a slight modification to point the button press to a script, which can then be customized as needed. (Used in RetroPie)
To install, just install normally through the Arcade Bonnet installed, selecting the pin you would like to use. (NOTE: GPIO 2 & 3 will cause bonnet controlls not to respond)
Then run
git clone https://github.com/bizzar721/Adafruit-GPIO-Halt/
cd Adafruit-GPIO-Halt
make
sudo make install
Replace /usr/local/bin/gpio-halt with the newly created gpio-halt
Create shutdown.sh, place in home/pi/RetroPie/ and make executable with
chmod +x /home/pi/RetroPie/shutdown.sh