My entry for Ludum Dare 32 - Make a game in 48 hours under the theme, "An Unconventional Weapon".

Each line is an action which your drone will do if the check after the "when" passes. The first line to pass it's check has it's action executed. Each time your drone wants to do something, it will consult your program, and do nothing if none of your rules apply.

The current checks are: always which always applies isWithin which takes a type of object, distance and an optional direction and checks to see if an object of a given type is within the given distance (and maybe also in the given direction)

The actions are: fire which takes a direction move which takes a direction wait which takes no parameters

Example program:

fire north when enemy isWithin 12 north
fire south when enemy isWithin 12 south
fire east when enemy isWithin 12 east
fire west when enemy isWithin 12 west
move south when edge isWithin 2 north
move north when edge isWithin 2 south
move east when edge isWithin 2 east
move west when edge isWithin 2 west
move south when always

The game is written in Elm, using Vim, Elm Reactor and Safari.

This was my first attempt to write something more than a Hello World! program in Elm. I chose Elm because I wanted a bigger challenge than my last Ludum Dare entry, and what better way than to drop myself in the deep end with a new language and a different programming paradigm? I didn't get very close to finishing the game, but I learnt a lot about Elm, so I consider the exercise a win.