trying to trace why there's a second newline after color display

image/main.rkt

@@ -1,8 +1,7 @@
-#lang s-exp "../lang/js/js.rkt"
+#lang s-exp "../lang/base.rkt"
 
-(declare-implementation
- #:racket "racket-impl.rkt"
- #:javascript ("colordb.js"
-               "kernel.js"
-               "js-impl.js")
- #:provided-values (is-color?))
+(require "private/main.rkt"
+         "private/color.rkt")
+
+(provide (all-from-out "private/main.rkt")
+         (all-from-out "private/color.rkt"))

image/private/color.rkt

@@ -0,0 +1,10 @@
+#lang s-exp "../../lang/base.rkt"
+
+(provide [struct-out color])
+
+(define-struct color (red green blue alpha)
+  #:extra-constructor-name make-color)
+
+
+(color 3 4 5 0)
+(make-color 3 5 7 0)

image/private/main.rkt

@@ -0,0 +1,8 @@
+#lang s-exp "../../lang/js/js.rkt"
+
+(declare-implementation
+ #:racket "racket-impl.rkt"
+ #:javascript ("colordb.js"
+               "kernel.js"
+               "js-impl.js")
+ #:provided-values (is-color?))

image/private/racket-impl.rkt

@@ -1,4 +1,4 @@
-#lang s-exp "../lang/base.rkt"
+#lang s-exp "../../lang/base.rkt"
 
 (provide is-color?)
 

js-assembler/package.rkt

@@ -2,6 +2,7 @@
 
 (require "assemble.rkt"
          "quote-cdata.rkt"
+         "../logger.rkt"
          "../make/make.rkt"
          "../make/make-structs.rkt"
          "../parameters.rkt"
@@ -67,9 +68,11 @@
    [(StatementsSource? src)
     #f]
    [(MainModuleSource? src)
-    (source-is-javascript-module? (MainModuleSource-source src))]
+    (source-is-javascript-module?
+     (MainModuleSource-source src))]
    [(ModuleSource? src)
-    (query:has-javascript-implementation? `(file ,(path->string (ModuleSource-path src))))]
+    (query:has-javascript-implementation?
+     `(file ,(path->string (ModuleSource-path src))))]
    [(SexpSource? src)
     #f]
    [(UninterpretedSource? src)
@@ -151,8 +154,10 @@ MACHINE.modules[~s] =
   ;; Translate all JavaScript-implemented sources into uninterpreted sources;
   ;; we'll leave its interpretation to on-visit-src.
   (define (wrap-source src)
+    (log-debug "Checking if the source has a JavaScript implementation")
     (cond
      [(source-is-javascript-module? src)
+      (log-debug "Replacing implementation with JavaScript one.")
       (get-javascript-implementation src)]
      [else
       src]))
@@ -208,7 +213,9 @@ MACHINE.modules[~s] =
 ;; package-standalone-xhtml: X output-port -> void
 (define (package-standalone-xhtml source-code op)
   (display *header* op)
+  (log-debug "writing the runtime")
   (display (quote-cdata (get-runtime)) op)
+  (log-debug "writing the source code")
   (display (quote-cdata (get-code source-code)) op)
   (display *footer* op))
 

logger.rkt

@@ -1,4 +1,5 @@
 #lang racket/base
+(require racket/match)
 
 ;; A small module to provide logging for Whalesong.
 
@@ -36,10 +37,13 @@
 (void (thread (lambda ()
                 (let ([receiver
                        (make-log-receiver whalesong-logger 'debug)])
-                  (let loop ([msg (sync receiver)])
+                  (let loop ()
+                    (let ([msg (sync receiver)])
                       (when should-print-logs?
-                      (displayln msg))
-                    (loop))))))
+                        (match msg
+                          [(vector level msg data)
+                           (printf "~a: ~a\n" level msg)]))
+                      (loop)))))))
                     
 
 

make/make.rkt

@@ -13,6 +13,9 @@
          racket/match)
 
 
+(require/typed "../logger.rkt"
+               [log-debug (String -> Void)])
+
 (require/typed "../parser/parse-bytecode.rkt"
                [parse-bytecode (Any -> Expression)])
 
@@ -31,6 +34,19 @@
   (make-parameter (lambda: ([s : Source]) s)))
 
 
+(: source-name (Source -> String))
+(define (source-name a-source)
+  (cond
+   [(StatementsSource? a-source)
+    "<StatementsSource>"]
+   [(UninterpretedSource? a-source)
+    "<UninterpretedSource>"]
+   [(MainModuleSource? a-source)
+    "<MainModuleSource>"]
+   [(SexpSource? a-source)
+    "<SexpSource>"]
+   [(ModuleSource? a-source)
+    "<ModuleSource>"]))
 
 
    
@@ -143,12 +159,15 @@
             [(hash-has-key? visited (first sources))
              (loop (rest sources))]
             [else
+             (log-debug (format "compiling a module ~a"
+                                (source-name (first sources))))
              (hash-set! visited (first sources) #t)
              (let*-values ([(this-source)
                              ((current-module-source-compiling-hook)
                               (first sources))]
                            [(ast stmts)
                             (get-ast-and-statements this-source)])
+               (log-debug "visiting")
                (on-module-statements this-source ast stmts)
                (loop (append (map wrap-source (collect-new-dependencies this-source ast))
                              (rest sources)))