look verb object description

interpret.rkt

@@ -2,14 +2,14 @@
 (require "structs.rkt")
 (provide interpret)
 
-;temporary hard-coded room with items for testing, before implementing procgen
+;temporary hard-coded player and room with items for testing, before implementing procgen
 (define room1 (room
                (pos 0 0)
                (dim 10 10)
                (list (weapon "BIG SWORD"  (pos 5 5) 4 'sword  5)
                      (armor "LEATHER CAP" (pos 5 9) 1 'helmet 2))))
-
-(define plyr (player "YOU" room1 '() 'human 20 '() 50))
+(define plyr (player "ME" room1 '() 'human 20 '() 50))
+(set-room-contents! room1 (append (room-contents room1) (list plyr)))
 
 (define (interpret in)
   (let ([command (string-upcase in)])
@@ -29,10 +29,13 @@
                      #:before-first "In this area, there is "
                      #:before-last ", and "
                      #:after-last ".")
-        (let ([what-str (string-join what)])
+        (let* ([what-str (string-join what)]
+               [obj (find-obj what-str room)])
           (if (find-obj what-str room)
-              (~a "There is a " what-str " in the area.")
+              (~a "There is a " what-str " in the area."
+                  (describe-obj obj))
               (~a "The \""  what-str "\" you're looking for isn't in this area."))))))
+
 (define (find-obj obj room)
   (findf
    (λ (arg) (string=? obj (obj-name arg)))
@@ -40,3 +43,28 @@
 
 (define (obj-names list)
   (map obj-name list))
+
+(define (describe-obj obj)
+  (let ([output ""])
+    (when (player? obj)
+      (append-str! output "\nIt's you."))
+    
+    (when (item? obj)
+      (append-str! output (~a "\nIt has a size of: " (item-size obj) "."))
+      (when (equipment? obj)
+        (append-str! output (~a "\nIt is a piece of equipment of type: " (equipment-type obj) "."))
+        (when (weapon? obj)
+          (append-str! output (~a "\nIt deals " (weapon-damage obj) " damage.")))
+        (when (armor? obj)
+          (append-str! output (~a "\nIt has a damage resistance of: " (armor-resistance obj) ".")))))
+
+    (when (creature? obj)
+      (append-str! output (~a "\nIts species is: " (creature-species obj) "."))
+      (append-str! output (~a "\nIt's at " (creature-health obj) "HP."))
+      (if (empty? (creature-equipment obj))
+          (append-str! output (~a "\nIt doesn't look like it's carrying anything."))
+          (append-str! output (~a "\nIt looks like it's carrying something."))))
+    output))
+
+(define-syntax-rule (append-str! str1 str2)
+  (set! str1 (~a str1 str2)))

structs.rkt

@@ -12,8 +12,12 @@
 (struct weapon equipment (damage))
 (struct armor equipment (resistance))
 
-(struct entity obj (inventory))
-(struct creature entity (species health equipment))
+(struct entity obj ((inventory #:mutable)))
+(struct creature entity (species
+                         (health #:mutable)
+                         (equipment #:mutable)))
 (struct player creature (capacity))
 
-(struct room (pos size contents))
+(struct room (pos
+              size
+              (contents #:mutable)))