Preparing skeleton for engines, systems, etc

[gacela.git] / src / game.scm

diff --git a/src/game.scm b/src/game.scm
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+;;; Gacela, a GNU Guile extension for fast games development
+;;; Copyright (C) 2014 by Javier Sancho Fernandez <jsf at jsancho dot org>
+;;;
+;;; This program 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.
+;;;
+;;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+(define-module (gacela game)
+  #:use-module (gacela engine)
+  #:use-module (ice-9 vlist)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-9 gnu))
+
+
+;;; Working with entities
+
+(define-record-type entity
+  (make-entity-record id components)
+  entity?
+  (id entity-id)
+  (components entity-components set-entity-components!))
+
+(set-record-type-printer! entity
+  (lambda (record port)
+    (format port "#<[entity ~a] ~a>"
+           (entity-id record)
+           (entity-components record))))
+
+(define (make-entity . components)
+  (make-entity-record
+   (gensym)
+   components))
+
+(export make-entity
+       entity?
+       entity-id)
+
+
+;;; Game Definition
+
+(define-record-type game
+  (make-game-record name entities)
+  game?
+  (name game-name set-game-name!)
+  (entities game-entities set-game-entities!))
+
+(set-record-type-printer! game
+  (lambda (record port)
+    (format port "#<[Game: ~a] ~a>"
+           (game-name record)
+           (map
+            (lambda (id)
+              (cdr (vhash-assoc id (game-entities record))))
+            (vhash-fold
+             (lambda (key value result)
+               (lset-union eqv? (list key) result))
+             '()
+             (game-entities record))))))
+
+(define (make-game name . entities)
+  (make-game-record
+   name
+   (alist->vhash
+    (map (lambda (e) (cons (entity-id e) e))
+        entities))))
+
+(export make-game
+       game?)
+
+
+;;; Working with games
+
+(define (add-entity game entity)
+  #f)