Ruby Warrior

Here's an interesting programming puzzle (thanks Nige). The challenge is to write a (stateless?) control function for a warrior, and have it fight its way up the stairs to the next level. This is the level I'm stuck on:

Level 6

The wall behind you feels a bit further away in this room. And you hear more cries for help.

Tip: You can walk backward by passing ':backward' as an argument to walk!. Same goes for feel, rescue! and attack!.



 --------
|C @ S aa|
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> = Stairs
@ = groo (20 HP)
C = Captive (1 HP)
S = Thick Sludge (24 HP)
a = Archer (7 HP)


Available Abilities:

warrior.walk!
Move in given direction (forward by default).

warrior.rest!
Gain 10% of max health back, but do nothing more.

warrior.feel
Returns a Space for the given direction (forward by default).

warrior.health
Returns an integer representing your health.

warrior.rescue!
Rescue a captive from his chains (earning 20 points) in given direction (forward by default).

warrior.attack!
Attack the unit in given direction (forward by default).

Give it a shot.