TIL There's a builtin function for getting the alliance station from FMS

[AlexNeedsAName]

I found a function in the wpilib that tells you what alliance you're on!

import edu.wpi.first.wpilibj.hal.AllianceStationID;
import edu.wpi.first.wpilibj.hal.HAL;

AllianceStationID AlianceStation = HAL.getAllianceStation();
boolean redAlliance = false;
if(AlianceStation == AllianceStationID.Red1 || AlianceStation == AllianceStationID.Red2 || AlianceStation == AllianceStationID.Red3) redAlliance = true;

I figured this could be useful for some teams in auton since the field isn't symmetrical. I wish they would have made it more accessible, since FIRST doesn't even consider the HAL to be user facing.