kekkonen/kekkonen.scm

(import srfi-1)
(import srfi-14)
(import (chicken io))
(import srfi-13)
(import matchable)
(import fmt)
(import fmt-color)
(import fmt-unicode)
(import ansi-escape-sequences)
(import (chicken file))
(import breadline)
(import ncurses)
(import util)
(import lisp)
(import parse)
(import io)
(import database)

(define (type-of elem)
  (cond ((pair? elem) 'pair)
	((symbol? elem) 'symbol)
	((number? elem) 'number)
	((char? elem) 'char)
	((string? elem) 'string)
	((boolean? elem) 'boolean)))

(define (get-location object)
  (database-get object 'location #f))

(define (set-name object name)
  (database-set object 'name name))

(define (set-description object description)
  (database-set object 'description description))

(define (get-name object)
  (database-get object 'name (symbol->string object)))

(define (get-description object)
  (database-get object 'description "You see the swirling void of creation."))

(define (get-container object)
  (database-get object 'container #f))

(define (get-contents object)
  (database-get object 'contents '()))

(define (set-destination object destination)
  (database-set object 'destination destination))

(define (get-destination object)
  (database-get object 'destination #f))

(define (set-enter-message object msg)
  (database-set object 'enter-message msg))

(define (get-enter-message object)
  (database-get object 'enter-message #f))

(define (get-aliases object)
  (database-get object 'aliases '()))

(define (set-aliases object alias-list)
  (database-set object 'aliases alias-list))

(define (add-alias object alias)
  (let ((aliases (get-aliases object)))
    (if (not (member alias aliases))
	(set-aliases object (cons alias aliases)))))

(define (remove-alias object alias)
  (let ((aliases (get-aliases object)))
    (if (member alias aliases)
	(set-aliases object (remove (curry eq? alias) aliases)))))

(define (set-hidden object value)
  (database-set object 'hidden value))
 
(define (get-hidden object)
  (database-get object 'hidden #f))

(define (set-fixed object value)
  (database-set object 'fixed value))

(define (get-fixed object value)
  (database-get object 'hidden #f))

(define (get-put-message object)
  (database-get object 'put-message "You put the ~a into the ~a."))

;; Is development mode enabled?

(define (devmode-enabled?)
  (has-property? 'you 'devmode))

(define (toggle-devmode)
  (toggle-flag 'you 'devmode))

;; Is an object fixed in place (e.g. cannot be picked up?)

(define (fixed? object)
  (has-property? object 'fixed))

(define (toggle-fixed object)
  (toggle-flag object 'fixed))

;; Match a tag against a list of objects, checking for its tag and its aliases.

(define (match-object tag objects)
  (let loop ((objects objects))
    (if (null? objects)
	#f
	(let ((taglist (cons (car objects) (get-aliases (car objects)))))
	  (if (member tag taglist)
	      (car objects)
	      (loop (cdr objects)))))))

(define (create-object tag name description)
  (set-name tag name)
  (set-description tag description))

(define (move-object object container)
  (let ((prev-container (get-container object)))
    (database-set object 'container container)
    (let ((contents (get-contents container)))
      (if (not (member object contents))
	  (begin
	    (database-set container 'contents (cons object contents))
	    (database-set prev-container 'contents (remove (curry eq? object) (get-contents prev-container))))))))

;; Determine the objects visible to a source object, zork-style
(define (visible-objects source)
  (let ((result (get-container source)))
    (if (and result (object-exists? result))
	(cons (get-container source) (get-contents (get-container source)))
	(error "Tried to determine visible objects for object without a container."))))

(define (print-room-description room)
  (newline)
  (display (set-text '(bold) (get-name room)))
  (if (devmode-enabled?) (display (set-text '(bold fg-green) (string-append " [" (symbol->string room) "]"))))
  (newline)
  (display "    ")
  (fmt #t (dsp (wrap-lines (get-description room))))
  (newline)
  (display "You see: ")
  (map (lambda (n) (if (not (get-hidden n)) (begin (display (get-name n)) (display " ") (if (devmode-enabled?) (begin (display (set-text '(bold fg-green) (string-append "[" (symbol->string n) "] ")))))))) (remove (curry eq? 'you) (get-contents room)))
  (newline))

(define (do-command-enter tag)
  (let ((object (match-object tag (visible-objects 'you))))
    (if (not object)
      (show "You cannot go that way.")
      (let ((destination (get-destination object)))
	(if (not destination)
	    (show "You cannot enter that.")
	    (begin
	      (move-object 'you destination)
	      (perhaps show (get-enter-message object))
	      (print-room-description (get-container 'you))))))))

(define (do-command-save)
  (let ((save-name (prompt-default "Enter save name: " "kekkonen.sav")))
    (if (or (not (file-exists? save-name)) (prompt-yn "That file already exists. Overwrite? "))
	(begin
	  (show "Saving database, please wait...")
	  (database-save save-name)
	  (show "Done.")))))

(define (do-command-load)
  (let ((save-name (prompt-default "Enter save file name to load: " "kekkonen.sav")))
    (if (not (file-exists? save-name))
	(show "That file does not exist.")
	(begin
	  (show "Loading database, please wait...")
	  (database-load save-name)
	  (show "Done.")))))

(define (do-command-look)
  (print-room-description (get-container 'you)))

(define (do-command-examine tag)
  (let ((object (match-object tag (visible-objects 'you))))
    (if (not object)
	(show "You cannot see that here.")
	(show (get-description object)))))

(define (do-command-inventory)
  (map (compose show get-name) (get-contents 'you)))

(define (do-command-take tag)
  (if (not (symbol? tag))
      (show "I didn't quite understand that.")
      (let ((object (match-object tag (if (devmode-enabled?)
					  (get-all-objects)
					  (visible-objects 'you)))))
	(if (or (not object) (and (fixed? object) (not (devmode-enabled?))))
	    (if object
		(show "That is fixed in place.")
		(show "You cannot see that here."))
	    (begin
	      (show (string-append "You get " (get-name object) "."))
	      (move-object object 'you))))))

(define (do-command-drop tag)
  (if (not (symbol? tag))
      (show "I didn't quite understand that.")
      (let ((object (match-object tag (get-contents 'you))))
	(if (not object)
	    (show "You are not carrying that.")
	    (begin
	      (show (string-append "You drop " (get-name object) "."))
	      (move-object object (get-container 'you)))))))

(define (do-command-put tag destination-tag)
  (let ((object (match-object tag (get-contents 'you))))
    (if (not object)
	(show "You are not carrying that.")
	(let ((destination-object (match-object destination-tag (visible-objects 'you))))
	  (if (not destination-object)
	      (show "You cannot see that here.")
	      (move-object object (get-destination destination-object)))))))

(define (do-command-devmode)
  (toggle-devmode)
  (if (devmode-enabled?)
      (show "Development mode enabled.")
      (show "Development mode disabled.")))

(define (do-command-create tag name description)
  (if (not (and (symbol? tag) (string? name) (string? description)))
      (show "I didn't quite understand that.")
      (if (object-exists? tag)
	  (show "That object already exists.")
	  (begin
	    (create-object tag name description)
	    (move-object tag (get-container 'you))))))

(define (do-setter-command tag value type? setter)
  (if (not (and (symbol? tag) (type? value)))
      (show "I didn't quite understand that.")
      (let ((object (match-object tag (visible-objects 'you))))
	(if (not object)
	    (show "You can't see that here.")
	    (begin
	      (setter object value)
	      (show "You set a value."))))))

(define (do-command-rename tag name)
  (do-setter-command tag name string? set-name))

(define (do-command-describe tag description)
  (do-setter-command tag description string? set-description))

(define (do-command-flag tag flag)
  (if (not (and (symbol? tag) (symbol? flag)))
      (show "I didn't quite understand that.")
      (let ((object (match-object tag (visible-objects 'you))))
	(if (not object)
	    (show "You can't see that here.")
	    (begin
	      (case flag
		((fixed) (set-fixed object #t))
		((hidden) (set-hidden object #t))
		(else (show "Invalid flag name."))))))))

(define (do-command-unflag tag flag)
  (if (not (and (symbol? tag) (symbol? flag)))
      (show "I didn't quite understand that.")
      (let ((object (match-object tag (visible-objects 'you))))
	(if (not object)
	    (show "You can't see that here.")
	    (begin
	      (case flag
		((fixed) (set-fixed object #f))
		((hidden) (set-hidden object #f))
		(else (show "Invalid flag name."))))))))

(define (do-command-alias tag alias)
  (if (not (and (symbol? tag) (symbol? alias)))
      (show "I didn't quite understand that.")
      (let ((object (match-object tag (visible-objects 'you))))
	(if (not object)
	    (show "You can't see that here.")
	    (begin
	      (add-alias object alias)
	      (show "You add an alias."))))))

(define (do-command-unalias tag alias)
  (if (not (and (symbol? tag) (symbol? alias)))
      (show "I didn't quite understand that.")
      (let ((object (match-object tag (visible-objects 'you))))
	(if (not object)
	    (show "You can't see that here.")
	    (begin
	      (remove-alias object alias)
	      (show "You remove an alias."))))))

(define (do-command-destroy tag)
  (if (not (symbol? tag))
      (show "I didn't quite understand that.")
      (database-remove tag)))

(define (do-command-aliases tag)
  (if (not (symbol? tag))
      (show "I didn't quite understand that.")
      (let ((object (match-object tag (visible-objects 'you))))
	(if (not object)
	    (show "You can't see that here.")
	    (begin
	      (newline)
	      (map (lambda (x) (display x) (display " ")) (get-aliases object))
	      (newline))))))

(define (do-command-message tag message-tag message)
  (if (not (and (symbol? tag) (symbol? message-tag) (string? message)))
      (show "I didn't quite understand that.")
      (let ((object (match-object tag (visible-objects 'you))))
	(if (not object)
	    (show "You can't see that here.")
	    (case message-tag
	      ((enter) (set-enter-message object message))
	      (else (show "Invalid message name.")))))))

(define (do-command-goto tag)
  (if (not (symbol? tag))
      (show "I didn't quite understand that.")
      (begin
	(move-object 'you tag)
	(print-room-description (get-container 'you)))))

(define +cardinal-sets+
  '((north n)
    (northeast ne north-east)
    (east e)
    (southeast se south-east)
    (south s)
    (southwest sw south-west)
    (west w)
    (northwest nw north-west)
    (up u)
    (down d)))

(define +cardinal-opposites+
  '((north . south)
    (northeast . southwest)
    (east . west)
    (southeast . northwest)
    (south . north)
    (southwest . northeast)
    (west . east)
    (northwest . southeast)
    (up . down)
    (down . up)))

(define (get-cardinal-set direction)
  (find (curry member direction) +cardinal-sets+))

(define (get-cardinal-aliases direction)
  (perhaps (curry remove (curry eq? direction)) (get-cardinal-set direction)))

(define (cardinal-direction? direction)
  (list? (member direction (flatten +cardinal-sets+))))

(define (get-inverse-direction direction)
  (perhaps cdr (assoc direction +cardinal-opposites+)))

(define (get-canonical-cardinal-direction-name direction)
  (perhaps car (get-cardinal-set direction)))

(define (do-command-dig direction destination)
  (if (not (and (symbol? direction) (symbol? destination)))
      (show "I didn't quite understand that.")
      (if (not (cardinal-direction? direction))
	  (show "You must specify a compass rose direction or up and down.")
	  (let ((canonical-direction (get-canonical-cardinal-direction-name direction)))
	    (let ((exit-tag (compose-symbols canonical-direction (get-container 'you) destination)))
	      (if (object-exists? exit-tag)
		  (show "An exit like that already exists.")
		  (begin
		    (move-object exit-tag (get-container 'you))
		    (set-hidden exit-tag #t)
		    (set-destination exit-tag destination)
		    (map (curry add-alias exit-tag) (get-cardinal-set direction))
		    (show "You create a passage."))))))))
      
(define (do-command-exit)
  (show "Goodbye, see you later...")
  (set! *exit-adventure* #t))

(define (alias-transform input)
  (match input
    (('quit) '(exit))
    (('i) '(inventory))
    (('inv) '(inventory))
    (('look x) `(examine ,x))
    (('go x) `(enter ,x))
    (('get x) `(take ,x))
    ((x) (if (cardinal-direction? x)
 	     `(enter ,x)
	     input))
    (_ input)))

(define (dispatch-command input)
  (let ((success #t))
    (match input
      (('look) (do-command-look))
      (('save) (do-command-save))
      (('load) (do-command-load))
      (('devmode) (do-command-devmode))
      (('exit) (do-command-exit))
      (('enter x) (do-command-enter x))
      (('take x) (do-command-take x))
      (('drop x) (do-command-drop x))
      (('inventory) (do-command-inventory))
      (('examine x) (do-command-examine x))
      (('put x y) (do-command-put x y))
      (_ (if (devmode-enabled?)
	     (match input
	       (('create x y z) (do-command-create x y z))
	       (('rename x y) (do-command-rename x y))
	       (('describe x y) (do-command-describe x y))
	       (('dig x y) (do-command-dig x y))
	       (('flag x y) (do-command-flag x y))
	       (('unflag x y) (do-command-unflag x y))
	       (('alias x y) (do-command-alias x y))
	       (('unalias x y) (do-command-unalias x y))
	       (('destroy x) (do-command-destroy x))
	       (('aliases x) (do-command-aliases x))
	       (('message x y z) (do-command-message x y z))
	       (('goto x) (do-command-goto x))
	       (_ (set! success #f)))
	     (set! success #f))))
    success))

(create-object 'garden "A Well-Kept Garden" "A french-style garden with topiary in the shape of various animals. A fountain gurgles happily in the middle. A trail leads off into a forest to the north.")
(create-object 'unicorn "a frolicking unicorn" "A white unicorn, with a long spiral horn.")
(create-object 'forest "A Foreboding Forest" "Tall trees bunch around a winding path.")
(create-object 'trail "a trail" "A winding trail.")
(add-alias 'trail 'winding)
(add-alias 'trail 'north)
(add-alias 'trail 'n)
(set-hidden 'trail #t)
(set-enter-message 'trail "You walk along the winding trail...")
(move-object 'you 'garden)
(move-object 'trail 'garden)
(toggle-fixed 'trail)
(set-destination 'trail 'forest)
(move-object 'unicorn 'garden)

(define *exit-adventure* #f)

(define (adventure)
  (let ((success (dispatch-command (alias-transform (adventure-prompt)))))
    (if (not success)
	(begin
	  (show "I didn't quite understand that.")
	  (adventure))
	(if *exit-adventure*
	    (show "Exiting..."); (display *database*)
	    (adventure)))))

(print-room-description (get-container 'you))
(adventure)