+;;; Mudsync --- Live hackable MUD
+;;; Copyright © 2016 Christopher Allan Webber <cwebber@dustycloud.org>
+;;;
+;;; This file is part of Mudsync.
+;;;
+;;; Mudsync is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; Mudsync is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with Mudsync. If not, see <http://www.gnu.org/licenses/>.
+
+;;; Containers
+
+(define-module (mudsync container)
+ #:use-module (8sync)
+ #:use-module (oop goops)
+ #:use-module (mudsync gameobj)
+ #:use-module (mudsync utils)
+ #:use-module (ice-9 control)
+ #:export (<container>
+ cmd-take-from cmd-put-in))
+
+(define-actor <container> (<gameobj>)
+ ((cmd-take-from cmd-take-from)
+ (cmd-put-in cmd-put-in))
+ ;; Can be a boolean or a procedure accepting
+ ;; (gameobj whos-acting take-what)
+ (take-from-me? #:init-value #t
+ #:init-keyword #:take-from-me?)
+ ;; Can be a boolean or a procedure accepting
+ ;; (gameobj whos-acting put-what)
+ (put-in-me? #:init-value #t
+ #:init-keyword #:put-in-me?))
+
+;; @@: Moving this to a container subclass/mixin could allow a lot more
+;; customization of take out / put in phrases
+(define* (cmd-take-from gameobj message
+ #:key direct-obj indir-obj preposition
+ (player (message-from message)))
+ (define player-name
+ (mbody-val (<-wait player 'get-name)))
+ (define player-loc
+ (mbody-val (<-wait player 'get-loc)))
+ (define our-name (slot-ref gameobj 'name))
+ ;; We need to check if we even have such a thing
+ (define this-thing
+ (call/ec
+ (lambda (return)
+ (for-each (lambda (occupant)
+ (define goes-by (mbody-val (<-wait occupant 'goes-by)))
+ (when (ci-member direct-obj goes-by)
+ (return occupant)))
+ (gameobj-occupants gameobj))
+ ;; nothing found
+ #f)))
+ (define (this-thing-name)
+ (mbody-val (<-wait this-thing 'get-name)))
+ (define (should-take-from-me)
+ (and this-thing
+ (slot-ref-maybe-runcheck gameobj 'take-from-me? player this-thing)))
+ (define (default-objection)
+ `("Unfortunately, it doesn't seem like you can take "
+ ,(this-thing-name) " " ,preposition " " ,our-name "."))
+
+ (define (this-thing-objection)
+ (mbody-receive (_ taken-ok? #:key why-not) ; does the object object to being removed?
+ (<-wait this-thing 'ok-to-be-taken-from? player) ; @@ no need to supply from where
+ (and (not taken-ok?)
+ ;; Either give the specified reason, or give a boilerplate one
+ (or why-not
+ (default-objection)))))
+ (cond
+ ;; Unfortunately this does leak information about what is contained
+ ;; by us. Maybe not what's wanted in all circumstances.
+ ((not this-thing)
+ (<- player 'tell
+ #:text `("You don't see any such " ,direct-obj " to take "
+ ,preposition " " ,our-name ".")))
+ ;; A particular objection to taking this thing.
+ ;; We should allow customizing the reason here, which could be
+ ;; provided by the 'ok-to-be-taken-from? slot.
+ ((not (should-take-from-me))
+ (<- player 'tell
+ #:text (default-objection)))
+ ;; the thing we wsant to take itself has objected...
+ ((this-thing-objection) =>
+ (lambda (objection)
+ (<- player 'tell
+ #:text objection)))
+ ;; looks like we can take it
+ (else
+ ;; Wait to announce to the player just in case settting the location
+ ;; errors out or something. Maybe it's overthinking things, I dunno.
+ (<-wait this-thing 'set-loc! #:loc player)
+ (<- player 'tell
+ #:text `("You take " ,(this-thing-name) " from "
+ ,our-name "."))
+ (<- player-loc 'tell-room
+ #:text `(,player-name " takes " ,(this-thing-name) " from "
+ ,our-name ".")
+ #:exclude player))))
+
+(define* (cmd-put-in gameobj message
+ #:key direct-obj indir-obj preposition
+ (player (message-from message)))
+ (define player-name
+ (mbody-val (<-wait player 'get-name)))
+ (define player-loc
+ (mbody-val (<-wait player 'get-loc)))
+ (define our-name (slot-ref gameobj 'name))
+ ;; We need to check if we even have such a thing
+ (define this-thing
+ (call/ec
+ (lambda (return)
+ (for-each (lambda (occupant)
+ (define goes-by (mbody-val (<-wait occupant 'goes-by)))
+ (when (ci-member direct-obj goes-by)
+ (return occupant)))
+ (mbody-val (<-wait player 'get-occupants)))
+ ;; nothing found
+ #f)))
+ (define (this-thing-name)
+ (mbody-val (<-wait this-thing 'get-name)))
+ (define (should-put-in-me)
+ (and this-thing
+ (slot-ref-maybe-runcheck gameobj 'put-in-me? player this-thing)))
+ (define (default-objection)
+ `("As much as you'd like to, it doesn't seem like you can put "
+ ,(this-thing-name) " " ,preposition " " ,our-name "."))
+ (define (this-thing-objection)
+ (mbody-receive (_ put-in-ok? #:key why-not) ; does the object object to being moved?
+ (<-wait this-thing 'ok-to-be-put-in? player (actor-id gameobj))
+ (and (not put-in-ok?)
+ ;; Either give the specified reason, or give a boilerplate one
+ (or why-not (default-objection)))))
+ (cond
+ ;; Is it not there, or maybe we won't allow it to be taken?
+ ((not this-thing)
+ (<- player 'tell
+ #:text `("You don't seem to have any such " ,direct-obj " to put "
+ ,preposition " " ,our-name ".")))
+
+ ((or (not (should-put-in-me)))
+ (<- player 'tell
+ #:text (default-objection)))
+ ;; the thing we wsant to take itself has objected...
+ ((this-thing-objection) =>
+ (lambda (objection)
+ (<- player 'tell
+ #:text objection)))
+ ;; looks like we can take it
+ (else
+ ;; Wait to announce to the player just in case settting the location
+ ;; errors out or something. Maybe it's overthinking things, I dunno.
+ (<-wait this-thing 'set-loc! #:loc (actor-id gameobj))
+ (<- player 'tell
+ #:text `("You put " ,(this-thing-name) " " ,preposition " "
+ ,our-name "."))
+ (<- player-loc 'tell-room
+ #:text `(,player-name " puts " ,(this-thing-name) " " ,preposition " "
+ ,our-name ".")
+ #:exclude player))))
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