;;;
;;; Atlantis is a framework for creating multi-user dungeon worlds.
;;; This is the Common Lisp implementation.
;;;
;;; This module is responsible for the interactive user interface. All
;;; in-game UI should be done here. (Pre-game UI goes into atlantis.lisp.)
;;;
;;; Licensed under the terms of the MIT license.
;;; author: Daniel Vedder
;;; date: 21/05/2015
;;;
;; TODO Out-source all game logic to other modules
;; (This module should be purely UI)
(defun play-game (player-name)
"The main game loop"
(let ((player (get-game-object 'player player-name)))
(clear-screen)
;; Initialize the player if necessary
(unless player
(setf player (create-player player-name))
(add-player player))
;; The actual game loop
(clear-screen)
(let ((place (get-game-object 'place (player-place player))))
(describe-place place (player-night-vision player))
(input-string command)
(while (not (or (equalp command "quit") (equalp command "exit")))
(game-command command player)
(input-string command))
(format t "~&Goodbye!"))))
(defun create-player (player-name)
"The user creates a new player"
;; XXX This function feels somewhat ugly - any possibility of a cleanup?
(let* ((start-player (get-game-object 'player "Start"))
(player (if start-player (copy-player start-player)
(make-player :name player-name
:place (random-elt (list-world-objects 'place)))))
(char-attr
'((strength 0) (dexterity 0)
(constitution 0) (intelligence 0)))
(items NIL) (weapon "")
(character-points NIL))
(format t "~&The name you have chosen is not registered on this game.")
(unless (y-or-n-p "~&Create a new player?") (start-menu) (quit))
;; Chose race and class
(format t "~&Please chose a race:")
(setf (player-race player) (choose-option (list-world-objects 'race)))
(format t "~&Please chose a class:")
(setf (player-class player)
(choose-option (list-world-objects 'character-class)))
(dolist (i (character-class-special-item
(get-game-object 'character-class (player-class player))))
(set-object-attribute player 'item i))
;; Set character attributes
(while (or (< (reduce #'+ character-points) 24) ; XXX magic number!
(not (set-p character-points)))
(set-list (1+ (random 20)) a b c d)
(setf character-points (list a b c d)))
(setf text "
Now distribute your attribute points. Random numbers have been chosen,
you may assign one number to each of the following attributes:")
(format t "~&~A~%~A~%~%The numbers are:"
text (string-from-list (keys char-attr)))
;; XXX I should replace simple-input with something offering 'magic' (?)
(do* ((i 0 (1+ i)) (attr (safe-nth i (keys char-attr))
(safe-nth i (keys char-attr)))
(val (cassoc attr char-attr) (cassoc attr char-attr)))
((= i (length char-attr)) player)
(format t "~&~A" (string-from-list character-points))
(simple-input val (concatenate 'string (symbol-name attr) ":"))
(while (not (member val character-points))
(format t "~&Sorry, invalid number chosen. Please reenter:")
(simple-input val (concatenate 'string (symbol-name attr) ":")))
(let ((player-fn (build-symbol "player-" attr)))
;; XXX Kludge ?!
(eval `(setf (,player-fn ,player) ,val)))
(setf character-points
(remove-if #'(lambda (x) (= x val)) character-points)))))
(defun describe-place (p &optional (show-dark t))
"Print out a complete description of place p"
;; XXX This has become slightly ugly with the addition of darkness...
(when (stringp p) (setf p (get-game-object 'place p)))
(objectify-place-monsters p)
(format t "~&~A" (string-upcase (place-name p)))
(format t "~&~%~A" (if (and (place-dark p) (not show-dark))
"You do not see a thing in here. It's too dark!"
(place-description p)))
(format t "~&~%Neighbouring places: ~A"
(string-from-list (place-neighbour p)))
(unless (and (place-dark p) (not show-dark))
(format t "~&Players present: ~A" (string-from-list (place-player p)))
(format t "~&Items: ~A" (string-from-list (place-item p)))
(format t "~&NPCs: ~A" (string-from-list (place-npc p)))
(format t "~&Monsters: ~A" (string-from-list
(list-place-objects 'monster p)))))
(defun game-command (cmd player)
"Execute a typed-in game command"
(let* ((command (read-from-string cmd))
(space (position #\Space cmd))
(arg (if space (second (cut-string cmd (1+ space))) NIL)))
(if (member command *commands*)
(if space (funcall command player arg)
(funcall command player))
(progn (format t "~&Sorry, this command does not exist!")
(format t "~&Type 'help' for a list of commands.")))))
;;;
;;; Here follow the functions that define the in-game commands.
;;;
;; A list of all in-game commands. Each new command must be registered here.
(defvar *commands*
'(help place player
goto pickup drop
talk trade
equip attack spell
about save clear))
;;; The following commands don't take any arguments except for a player
(defun help (player)
"Print out a list of in-game commands"
(setf help-text "
Commands:
help - Show this list of game commands
quit/exit - Exit the game
clear - Clear the screen
place - Describe the current location
player - Describe your player
goto <place> - Go to a neighbouring location
about <object> - Show a description of this entity
talk to <npc> - Talk to an NPC
pickup <item> - Pick up an item lying around
drop <item> - Drop the item
equip <weapon> - Equip this item as your weapon
attack <monster> - Fight a monster
save <game-file> - Save the game to file")
(format t "~A" help-text))
(defun clear (player)
"Clear the screen (wrapper function)"
(clear-screen)
(place player))
;; XXX Will the following two functions give problems? (Their name is
;; identical with the struct name) Probably not, but best to be aware.
(defun place (player)
"Describe the player's current location (wrapper function)"
(describe-place (player-place player) (player-night-vision player)))
(defun player (p)
"Print a description of this player"
(let ((tab (string #\tab)))
(when (stringp p) (setf p (get-game-object 'player p)))
(format t "~&Player ~A:" (player-name p))
(format t "~&~%Current place: ~A" (player-place p))
(format t "~&Race: ~A~AClass: ~A" (player-race p) tab (player-class p))
(format t "~&=====")
(format t "~&Attributes:")
(format t "~&Intelligence: ~A~AStrength: ~A"
(player-intelligence p) tab (player-strength p))
(format t "~&Constitution: ~A~ADexterity: ~A"
(player-constitution p) tab (player-dexterity p))
(format t "~&Night vision: ~A"
(if (player-night-vision p) "yes" "no"))
(format t "~&=====")
(format t "~&Weapon: ~A" (player-weapon p))
;; XXX This will need adjusting for large item numbers
(format t "~&Items: ~A" (string-from-list (player-item p)))
(format t "~&=====")
(format t "~&Max health: ~A~ACurrent health: ~A"
(player-max-health p) tab (player-health p))
(format t "~&Experience: ~A~AMoney: ~A"
(player-experience p) tab (player-money p))))
;;; These next functions have to take two arguments (the argument
;;; to the function and a player instance).
(let ((last-save NIL))
(defun save (player &optional game-file)
"Save a game to file (wrapper method around save-world)"
;; XXX Include a permissions check (only allow admins to save)?
;; Could give problems in single-player mode.
(cond (game-file (setf last-save game-file))
((and last-save (not game-file)) (setf game-file last-save))
((not (or last-save game-file))
(format t "~&Where do you want to save the game?")
(input-string game-file)
(setf last-save game-file)))
(when (y-or-n-p "Save game to ~A?" game-file)
(save-world game-file)
(format t "~&Game saved."))))
(defun goto (player &optional location)
"Go to the specified location"
;; Look before you leap ;-)
(unless location
(format t "~&Please specify a location!")
(return-from goto))
(when (not (member location
(place-neighbour (get-game-object 'place
(player-place player)))
:test #'equalp))
(format t "~&This place does not border your current location!")
(return-from goto))
;; Change places
(clear-screen)
(debugging "~&~A is going to ~A." (player-name player) location)
(change-player-location player location)
(add-player-experience player 1)
(describe-place location (player-night-vision player)))
(defun about (player &optional object-name)
"Print a description of this object"
(unless object-name
(format t "~&Please specify the object you wish to inspect!")
(return-from about))
;; A bit of syntactic sugar...
(cond ((equalp object-name "me") (player player) (return-from about))
((equalp object-name "here") (place player) (return-from about)))
(let ((description (get-object-description object-name
(player-place player))))
;; Don't forget items the player is carrying
(when (member object-name (player-item player) :test #'equalp)
(setf description
(item-description (get-game-object 'item object-name))))
(if description
(format t "~&(~A) ~A" object-name description)
(format t "~&Could not find ~A!" object-name))))
(defun talk (player &optional npc-name)
"Talk to the desired NPC"
;; TODO Add interactive facility
(unless npc-name
(format t "~&Please specify an NPC to talk to!")
(return-from talk))
;; Allow for a bit of syntactic sugar (note: interface inconsistency?)
(let ((split-name (cut-string npc-name 3)))
(when (equalp (first split-name) "to ")
(setf npc-name (second split-name))))
(let* ((place (get-game-object 'place (player-place player)))
(npc (when (member npc-name (place-npc place) :test #'equalp)
(get-game-object 'npc npc-name))))
;; Check if the NPC is here
(unless npc
(format t "~&~A is not here!" npc-name)
(return-from talk))
(format t "~&~A: ~A" (string-upcase npc-name) (npc-says npc))
;; Trade with the NPC
(when (and (npc-sells npc)
(y-or-n-p "Trade with ~A?" npc-name))
(trade player npc))
;; Handle quests
(let ((quest (get-game-object 'quest (npc-quest npc))))
(when quest
(if (dolist (i (quest-proof-item quest))
(unless (member i (player-item player) :test #'equalp)
(return T)))
(when (y-or-n-p "~%~A has a quest. Accept it?" npc-name)
(format t "~&~A: ~A" (string-upcase npc-name)
(quest-say-before quest)))
(when (y-or-n-p "~%Give to ~A: ~A?" npc-name
(string-from-list (quest-proof-item quest) ", "))
(dolist (j (quest-proof-item quest))
(remove-object-attribute player 'item j))
(dolist (k (quest-reward-item quest))
(set-object-attribute player 'item k))
(add-player-experience player (quest-experience quest))
(add-player-money player (quest-money quest))
(format t "~&~A: ~A" (string-upcase npc-name)
(quest-say-after quest))
(format t "~&~%Quest complete. You gain:")
(format t "~&Money: ~A Experience: ~A~&Items: ~A"
(quest-money quest) (quest-experience quest)
(string-from-list (quest-reward-item quest)))))))))
(defun trade (player npc)
"The player trades with this NPC"
;; TODO Implement player-sells-to-npc feature
(when (and (stringp npc)
(member npc
(place-npc (get-game-object 'place (player-place player)))
:test #'equalp))
(setf npc (get-game-object 'npc npc))
(unless (npc-sells npc)
(format t "~&This NPC doesn't sell anything!")
(return-from trade)))
(format t "~&~%What do you want to buy? Your money: ~S"
(player-money player))
(let* ((choice (choose-option (append (npc-sells npc) (list "None"))))
(item (get-game-object 'item choice))
(cost (if item (item-cost item) NIL)))
(cond ((equalp choice "None") NIL)
;; XXX Do we have to insure that every object referenced by the
;; world exists, or is that the responsibility of the person
;; who writes the ATL code?
((not item)
(format t "~&This object does not exist!")
(format t "(Talk to the world creator)")
NIL)
((< (player-money player) cost)
(format t "~&You do not have enough money!"))
((y-or-n-p "Buy ~A for ~S?" choice cost)
(decf (player-money player) cost)
(set-object-attribute player 'item choice)
(format t "~&Bought ~A for ~A." choice cost))))
(if (y-or-n-p "Buy something else?")
(trade player npc) (clear player)))
(defun pickup (player &optional item-name)
"The player picks up an item"
(unless item-name
(format t "~&Please specify an item to pick up!")
(return-from pickup))
(let ((place (get-game-object 'place (player-place player)))
(item (get-game-object 'item item-name)))
(if (member item-name (place-item place) :test #'equalp)
(progn
(set-object-attribute player 'item item-name)
(when (item-function item)
(funcall (item-function item)))
(remove-object-attribute place 'item item-name)
(format t "~&You have picked up: ~A" item-name))
(format t "~&Sorry, this item is not here!"))))
(defun drop (player &optional item)
"The player drops the specified item"
(unless item
(format t "~&Please specify an item to drop!")
(return-from drop))
(if (member item (player-item player) :test #'equalp)
(progn
(remove-object-attribute player 'item item)
(when (equalp (item-weapon (get-game-object 'item item)) "yes")
(set-object-attribute player 'weapon ""))
(set-object-attribute
(get-game-object 'place (player-place player)) 'item item)
(format t "~&You have dropped: ~A" item))
(format t "~&You do not possess this item!")))
(defun equip (player &optional new-weapon)
"The player sets another item to be his weapon"
(when (or (not new-weapon) (equalp new-weapon "none"))
(setf (player-weapon player) "")
(format t "~&You no longer have any weapon equipped.")
(return-from equip))
(if (and (member new-weapon (player-item player) :test #'equalp)
(equalp (item-weapon (get-game-object 'item new-weapon)) "yes"))
(progn
(setf (player-weapon player) new-weapon)
(format t "~&You have equipped: ~A" new-weapon))
(format t "~&Sorry, this item is not available as a weapon!")))
(defun attack (player &optional opponent)
"The player launches an attack at a monster"
;; Check input for validity
(unless opponent
(format t "~&Please specify an opponent!")
(return-from attack))
(unless (member opponent
(list-place-objects 'monster
(get-game-object 'place (player-place player)))
:test #'equalp)
(format t "~&This monster is not here!")
(return-from attack))
;; Bind all relevant values to variables (saves typing later)
(let* ((place (get-game-object 'place (player-place player)))
(monster (dolist (m (place-monster place))
(when (equalp (monster-name m) opponent)
(return m))))
(m-str (monster-strength monster))
(m-dex (monster-dexterity monster))
(m-ac (monster-armour-class monster))
(m-weapon (get-game-object 'weapon (monster-weapon monster)))
(p-str (player-strength player))
(p-dex (player-dexterity player))
(p-ac (player-armour-class player))
(p-weapon (if (not (equalp (player-weapon player) "")) ;lbyl
(get-game-object 'weapon (player-weapon player))
(make-weapon :name "Fists" :damage 0)))
(damage 0))
;; Print information about the combattants
(format t "~&Health ~A: ~A Health ~A: ~A" (player-name player)
(player-health player) opponent (monster-health monster))
;; Determine whether the player or the monster strikes
(if (> (+ (random 10) p-dex) (+ (random 10) m-dex)) ;XXX magic numbers!
(setf damage (calculate-damage p-str p-weapon m-dex m-ac))
(setf damage (- 0 (calculate-damage m-str m-weapon p-dex p-ac))))
;; Negative damage denotes that the player has been hit
(cond ((plusp damage)
(decf (monster-health monster) damage)
(format t "~&You hit! ~A points damage." damage)
(when (> 1 (monster-health monster))
(let ((experience (round (average m-str m-dex))))
(remove-object-attribute place
'monster monster)
(add-player-experience player experience)
(format t "~&You killed the monster! ")
(format t "~A points experience." experience))))
((minusp damage)
(change-player-health player damage)
(format t "~&You missed. Your opponent hit! ")
(format t "~A points damage." damage))
(t (format t "~&You missed. Your opponent missed.")))))
(defun calculate-damage (att-str att-weapon def-dex def-ac)
"A private function to calculate the damage caused by an attack"
(let ((damage 0))
(incf damage (random att-str))
(incf damage (weapon-damage att-weapon))
(decf damage (random def-dex))
(decf damage def-ac)
(if (minusp damage) 0 damage)))
(defun spell (player &optional spell)
"Call this game function"
;; TODO Remove this/change it so that not all game-functions can be called
(cond ((null spell)
(format t "~&Please specify a spell to cast!")
(return-from spell))
((not (member spell (list-world-objects 'game-function) :test #'equalp))
(format t "~&This spell does not exist!")
(return-from spell))
(t (format t "~&~A" (game-function-print
(get-game-object 'game-function spell)))
(run-game-function spell player))))
