Key buffers and Key timers

//KEY BUFFER
//------------------------------------------
/*
	Holds the value of a key press/release for a set time then decrease it back to 0 unless key is pressed again
	I recommend using this only for key/mouse press/release, not for holding as that's usually a per-frame kind of check

	NOTE: If you're using GML, key will check as bool TRUE as long as its value is > 0.5, otherwise you'll need to check its value
	GML: if (key) { /*code*/ }
	Other: if (key > 0) { /* code */ }
*/
//------------------------------------------

//Buffer duration set to 10 frames
buffer_time = 10;

//Reduce buffer timer
key = max(--key, 0);

//Get new key press/release
key = max(key_check * buffer_time, key);

//------------------------------------------
//Short version
//------------------------------------------
buffer_time = 10;
key = max(key_check* buffer_time, --key);


//------------------------------------------
//How to check if the key was JUST pressed
//------------------------------------------
if (key == buffer_time) { /*code*/ }


//KEY TIMER
//------------------------------------------
/*
	Holds the number of frames a key was held for, resets to 0 when released
	I recommend using this for key/mouse hold, as it's usually a per-frame kind of check
*/
//------------------------------------------

//Get current key press input
var _key_input= key_check;

//Sum to previous key value OR reset to zero
key = (key + _key_input) * _key_input;