+ #:init-thunk
+ (build-commands
+ (("l" "look") ((loose-direct-command cmd-look-at-from-room)))))
+
+ (actions #:allocation #:each-subclass
+ #:init-thunk
+ (build-actions
+ (cmd-go room-cmd-go)
+ (cmd-go-where room-cmd-go-where)
+ (announce-entrance room-announce-entrance)
+ (look-room room-look-room)
+ (tell-room room-act-tell-room)
+ ;; in this case the command is the same version as the normal
+ ;; look-room version
+ (cmd-look-room room-look-room)
+ (cmd-look-at-from-room room-look-dont-see-it)
+ (cmd-say room-cmd-say)
+ (cmd-emote room-cmd-emote)
+ ;; movement aliases
+ (go-north (exit-shorthand "north"))
+ (go-northeast (exit-shorthand "northeast"))
+ (go-east (exit-shorthand "east"))
+ (go-southeast (exit-shorthand "southeast"))
+ (go-south (exit-shorthand "south"))
+ (go-southwest (exit-shorthand "southwest"))
+ (go-west (exit-shorthand "west"))
+ (go-northwest (exit-shorthand "northwest"))
+ (go-up (exit-shorthand "up"))
+ (go-down (exit-shorthand "down")))))
+
+(define common-exit-aliases
+ '(("n" . "north")
+ ("ne" . "northeast")
+ ("e" . "east")
+ ("se" . "southeast")
+ ("s" . "south")
+ ("sw" . "southwest")
+ ("w" . "west")
+ ("nw" . "northwest")
+ ("u" . "up")
+ ("d" . "down")))
+
+(define (dealias-exit-name exit-name)
+ (or (assoc-ref common-exit-aliases exit-name)
+ exit-name))
+
+(define* (room-cmd-go room message #:key direct-obj)
+ (define exit
+ (find
+ (lambda (exit)
+ (equal? (exit-name exit) (dealias-exit-name direct-obj)))
+ (room-exits room)))
+ (define to-address (if exit
+ ;; Get the exit, but resolve it dynamically
+ ;; in case it's a special
+ (dyn-ref room (slot-ref exit 'to))
+ #f))
+ (define player (message-from message))
+ (define player-name
+ (mbody-val (<-wait player 'get-name)))
+ (cond
+ (exit
+ (call-with-values (lambda ()
+ (exit-can-traverse? exit room player))
+ (lambda* (can-traverse? #:optional player-flavortext
+ room-flavortext)
+ (cond
+ ;; The exit itself objects to moving
+ ((not can-traverse?)
+ (<- player 'tell
+ #:text (or player-flavortext
+ `("You try to go " ,direct-obj " but something "
+ "seems to block you.")))
+ (when room-flavortext
+ (room-tell-room room room-flavortext
+ #:exclude player)))
+ ;; to-address points nowhere, or exit not set.
+ ((not exit)
+ (<- player 'tell
+ #:text '((i "Yikes!") " Something weird is going on. "
+ "It seems like this exit leads nowhere, "
+ "in a programming bug kind of way. "
+ "Maybe tell an administrator?")))
+ ;; looks like we can go, so let's go!
+ (else
+ ;; Set the player's new location
+ (<-wait player 'set-loc!
+ #:loc to-address)
+ (when player-flavortext
+ (<-wait player 'tell
+ #:text player-flavortext))
+ ;; Tell everyone else the person walked away
+ (room-tell-room
+ room (or room-flavortext
+ (format #f "~a wanders ~a.\n"
+ player-name direct-obj)))
+ (<- to-address 'announce-entrance
+ #:who-entered player)
+ ;; Have the new room update the player to the new location
+ (<- to-address 'look-room
+ #:to-id player))))))
+ (else
+ (<- player 'tell
+ #:text "You don't see any way to go there.\n"))))
+
+(define (room-cmd-go-where room message)
+ (<- (message-from message) 'tell
+ #:text "Go where?\n"))