--- /dev/null
+(define-module (mudsync command)
+ #:use-module (mudsync parser)
+ #:use-module (mudsync gameobj)
+ #:use-module (8sync systems actors)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-9)
+ #:use-module (ice-9 control)
+ #:use-module (ice-9 match)
+
+ #:export (direct-command
+ indir-command
+ empty-command
+ direct-greedy-command
+ greedy-command
+ player-gather-command-handlers
+ find-command-winner))
+
+;;; Commands
+;;; ========
+
+(define %low-priority 0)
+(define %default-priority 1)
+(define %high-priority 2)
+
+(define-record-type <command>
+ (make-command verbs matcher should-handle action priority)
+ command?
+ (verbs command-verbs)
+ (matcher command-matcher)
+ (should-handle command-should-handle)
+ (action command-action)
+ (priority command-priority))
+
+
+(define (direct-command verbs action)
+ (make-command verbs
+ cmatch-direct-obj
+ ;; @@: Should we allow fancier matching than this?
+ ;; Let the actor itself pass along this whole method?
+ (lambda* (goes-by #:key direct-obj)
+ (member direct-obj goes-by))
+ action
+ %default-priority))
+
+(define* (indir-command verbs action #:optional prepositions)
+ (make-command verbs
+ cmatch-indir-obj
+ ;; @@: Should we allow fancier matching than this?
+ ;; Let the actor itself pass along this whole method?
+ (lambda* (goes-by #:key direct-obj indir-obj preposition)
+ (if prepositions
+ (and
+ (member indir-obj goes-by)
+ (member preposition prepositions))
+ (member indir-obj goes-by)))
+ action
+ %high-priority))
+
+(define (empty-command verbs action)
+ (make-command verbs
+ cmatch-empty
+ (const #t)
+ action
+ %low-priority))
+
+(define (greedy-command verbs action)
+ (make-command verbs
+ cmatch-greedy
+ (const #t)
+ action
+ %low-priority))
+
+(define (direct-greedy-command verbs action)
+ "greedy commands but which match the direct object"
+ (make-command verbs
+ cmatch-direct-obj-greedy
+ (lambda* (goes-by #:key direct-obj rest)
+ (member direct-obj goes-by))
+ action
+ %low-priority))
+
+;; @@: We should probably ONLY allow these to go to users!
+(define* (custom-command verbs matcher should-handle action
+ #:optional (priority %default-priority))
+ "Full-grained customizable command."
+ (make-command verbs matcher should-handle action priority))
+
+
+;;; Command handling
+;;; ================
+
+;; @@: Hard to know whether this should be in player.scm or here...
+;; @@: This could be more efficient as a stream...!?
+(define (player-gather-command-handlers player verb)
+
+ (define player-loc
+ (let ((result (gameobj-loc player)))
+ (if result
+ result
+ (throw 'player-has-no-location
+ "Player ~a has no location! How'd that happen?\n"
+ #:player-id (actor-id player)))))
+
+ ;; Ask the room for its commands
+ (define room-commands
+ ;; TODO: Map room id and sort
+ (message-ref
+ (<-wait player player-loc
+ 'get-container-commands
+ #:verb verb)
+ 'commands))
+
+ ;; All the co-occupants of the room (not including ourself)
+ (define co-occupants
+ (remove
+ (lambda (x) (equal? x (actor-id player)))
+ (message-ref
+ (<-wait player player-loc 'get-occupants)
+ 'occupants)))
+
+ ;; @@: There's a race condition here if someone leaves the room
+ ;; during this, heh...
+ ;; I'm not sure it can be solved, but "lag" on the race can be
+ ;; reduced maybe?
+
+ ;; Get all the co-occupants' commands
+ (define co-occupant-commands
+ ;; TODO: Switch this to a fold. Ignore a result if it
+ ;; returns false for in the command response
+ (map
+ (lambda (co-occupant)
+ (let ((result (<-wait player co-occupant 'get-commands
+ #:verb verb)))
+ (list
+ (message-ref result 'commands)
+ (message-ref result 'goes-by)
+ co-occupant)))
+ co-occupants))
+
+ ;; Append our own command handlers
+ (define our-commands
+ ((@@ (mudsync player) player-self-commands) player))
+
+ ;; TODO: Append our inventory's relevant command handlers
+
+ ;; Now return a big ol sorted list of ((actor-id . command))
+ (append
+ (sort-commands-append-actor room-commands
+ player-loc '()) ; room doesn't go by anything
+ (sort-commands-multi-actors co-occupant-commands)
+ (sort-commands-append-actor our-commands
+ (actor-id player) '()))) ; nor does player
+
+(define (sort-commands-append-actor commands actor-id goes-by)
+ (sort-commands-multi-actors
+ (map (lambda (command) (list command actor-id)) commands)))
+
+(define (sort-commands-multi-actors actors-and-commands)
+ (sort
+ actors-and-commands
+ (lambda (x y)
+ (> (command-priority (cdr x))
+ (command-priority (cdr y))))))
+
+
+(define-record-type <command-winner>
+ (make-command-winner action actor-id)
+ command-winner?
+ (action command-winner-action)
+ (actor-id command-winner-action-id))
+
+
+(define (find-command-winner sorted-candidates line)
+ "Find a command winner from a sorted list of candidates"
+ ;; A cache of results from matchers we've already seen
+ (define matcher-cache '())
+ (find
+ (match-lambda
+ ((command actor-id actor-goes-by)
+
+ (let* ((matcher (command-matcher command))
+ (matched (matcher line)))
+ (if (and matched
+ ;; Great, it matched, but does it also pass
+ ;; should-handle?
+ (apply (command-should-handle command)
+ actor-goes-by
+ matched)) ; matched is kwargs if truthy
+ actor-id
+ #f))))
+ sorted-candidates))
projects / mudsync.git / blobdiff