Get Enemy Distance?

[Xenthio]

i would like a way for the bot i have made to change weapons depending on distance, how could i achieve this? if not could you perhaps make a way to grab the distance from the bot to the enemy?

[xDShot]

https://github.com/xDShot/xdbot/blob/master/lua/entities/xdbot_controller_base.lua#L639 for ex.