Basically wire the things up!

src/ludus/data.cljc

@@ -1 +1,2 @@
-(ns ludus.data)
+(ns ludus.data)
+

src/ludus/interpreter.cljc

@@ -895,7 +895,7 @@
         interpreted (interpret-ast parsed base-ctx)
         namespace (dissoc interpreted ::data/type ::data/name ::data/struct)
         context (ns->ctx namespace)]
-    ;(println context)
+    (println "Prelude fully loaded.")
     context))
 
 ; ;; TODO: update this to use new parser pipeline & new AST representation
@@ -939,17 +939,18 @@
          {:result :error :ctx (volatile! orig-ctx)})))))
 
 (defn interpret-safe [source parsed ctx]
-  (try
-    (let [base-ctx (volatile! {::parent (volatile! (merge ludus-prelude ctx))})]
-      (interpret-ast parsed base-ctx))
-    (catch #?(:clj Throwable :cljs js/Object) e
-      (println "Ludus panicked!")
-      (println "On line" (get-in (ex-data e) [:ast :token :line]))
-      (println ">>> " (get-line source (get-in (ex-data e) [:ast :token :line])))
-      (println (ex-message e))
-      (pp/pprint (ex-data e))
-      (throw e)
-      )))
+  (let [base-ctx (volatile! {::parent (volatile! (merge ludus-prelude ctx))})]
+    (try
+      (println "Running source: " source)
+      (interpret-ast parsed base-ctx)
+      (catch #?(:clj Throwable :cljs js/Object) e
+        (println "Ludus panicked!")
+        (println "On line" (get-in (ex-data e) [:ast :token :line]))
+        (println ">>> " (get-line source (get-in (ex-data e) [:ast :token :line])))
+        (println (ex-message e))
+        (pp/pprint (ex-data e))
+        (throw e)
+        ))))
 
 ;; repl
 (comment

src/ludus/node.cljc

@@ -0,0 +1,42 @@
+(ns ludus.node
+ 	(:require [ludus.interpreter :as i]
+  	 [ludus.grammar :as g]
+  	 [ludus.parser :as p]
+  	 [ludus.scanner :as s]
+  	 [ludus.prelude :as pre]
+  	 [ludus.show :as show]
+  	 [ludus.base :as base]
+  	 [ludus.data :as data]
+  	 )
+ 	)
+
+(declare ld->clj)
+
+(defn cljify [[k v]] [k (ld->clj v)])
+
+(defn ld->clj [value]
+ 	(case (base/get-type value)
+  		(:nil :number :string :boolean :keyword :set) value
+
+  		(:list :tuple) (into [] (map ld->clj) (rest value))
+
+  		(:dict :struct :ns) (into {} (map cljify) (dissoc value ::data/dict ::data/struct ::data/type ::data/name))
+
+  		:ref (ld->clj @(::value value))
+
+  		:fn (throw (ex-info (str "Cannot export functions from Ludus to Clojure. You tried exporting " (show/show value)) {}))))
+
+(defn run [source]
+ 	(let [user_scanned (s/scan source)
+      		user_tokens (:tokens user_scanned)
+      		user_parsed (p/apply-parser g/script user_tokens)
+      		user_result (i/interpret-safe source user_parsed {})
+      		post_scanned (s/scan pre/postlude)
+      		post_tokens (:tokens post_scanned)
+      		post_parsed (p/apply-parser g/script post_tokens)
+      		post_result (i/interpret-safe source post_parsed {})
+      		ludus_result (assoc post_result :result user_result)
+      		clj_result (ld->clj ludus_result)
+      		]
+   	#?(:clj clj_result :cljs (clj->js clj_result))
+   	))

src/ludus/node.cljs

@@ -1,16 +0,0 @@
-(ns ludus.node
- 	(:require [ludus.interpreter :as i]
-  	 [ludus.grammar :as g]
-  	 [ludus.parser :as p]
-  	 [ludus.scanner :as s])
- 	)
-
-(defn run [source]
- 	(let [scanned (s/scan source)
-      		tokens (:tokens scanned)
-      		parsed (p/apply-parser g/script tokens)
-      		result (i/interpret-safe source parsed {})]	
-   	(clj->js {:result result
-            		:errors []
-            		:console []
-            		:draw []})))

src/ludus/postlude.ld

@@ -0,0 +1,11 @@
+& this file runs after any given interpretation
+& the goal is to output any global state
+
+if turtle_state() :visible? then render_turtle! () else nil
+
+#{
+	& :result result is provided elsewhere
+	:errors [] & if we get here there are no errors
+	:console deref (console)
+	:draw deref (p5_calls)
+}

src/ludus/prelude.cljc

@@ -6,4 +6,10 @@
  	#?(
    		:clj (slurp "src/ludus/prelude.ld")
    		:cljs (r/inline "./prelude.ld")
-    	))
+    	))
+
+(def postlude
+ 	#?(
+   		:clj (slurp "src/ludus/postlude.ld")
+   		:cljs (r/inline "./postlude.ld")
+   		))

src/ludus/prelude.ld

@@ -125,9 +125,24 @@ fn append {
 	(xs as :set, x) -> base :conj (xs, x)
 }
 
+ref console = []
+
+fn add_msg! {
+	"Adds a message to the console."
+	(msgs) -> {
+		let strs = map (show, msgs)
+		let msg = fold (concat, strs, "")
+		update! (console, append (_, msg))
+		:ok
+	}
+}
+
 fn print! {
 	"Sends a text representation of Ludus values to the console."
-	(...args) -> base :print (args)
+	(...args) -> {
+		base :print (args)
+		add_msg! (args)
+	}
 }
 
 fn show {
@@ -694,23 +709,26 @@ let turtle_angle = 0.375
 let turtle_color = (100, 100, 100, 100)
 
 fn render_turtle! () -> {
-	let state = do turtle_state > deref > last
+	let state = do turtle_states > deref > last
 	if state :visible?
 		then {
 			add_call! ((:push))	
 			let (r, g, b, a) = turtle_color
 			add_call! ((:fill, r, g, b, a))
 			add_call! ((:noStroke))
-			let #{heading, position} = state
+			let #{heading, :position (x, y)} = state
+			add_call! ((:translate, x, y))
 			add_call! ((:rotate, turn/deg (heading)))
 			add_call! ((:beginShape))
-			let head_unit = heading/vec (heading)
+			let head_unit = heading/vector (heading)
 			let first = mult (head_unit, turtle_radius)
-			let second = rotate (first, turtle_angle)
-			let third = rotate (first, neg (turtle_angle))
-			add_call! ((:vertex, first))
-			add_call! ((:vertex, second))
-			add_call! ((:vertx, third))
+			let (x1, y1) = first
+			let (x2, y2) = rotate (first, turtle_angle)
+			let (x3, y3) = rotate (first, neg (turtle_angle))
+			add_call! ((:vertex, x1, y1))
+			add_call! ((:vertex, x2, y2))
+			add_call! ((:vertex, x3, y3))
+			add_call! ((:endShape))
 			add_call! ((:pop))
 			:ok
 		}
@@ -911,6 +929,7 @@ ns prelude {
 	inc
 	dec
 	print!
+	console
 	show
 	prn!
 	type
@@ -991,4 +1010,5 @@ ns prelude {
 	heading/vector
 	turtle_state
 	p5_calls, turtle_states, turtle_commands
-}
+	render_turtle!
+}