log level is implemented.

main.rkt

@@ -70,6 +70,17 @@
 (define (sl-log-level)
   log-level)
 
+(define log-hash (hash 'debug 0 'dbg 0
+                       'info 1
+                       'warning 2 'warn 2
+                       'err 3 'error 3
+                       'fatal 5))
+
+(define (needs-logging level)
+  (let ((ll (hash-ref log-hash log-level 6))
+        (l (hash-ref log-hash level 6)))
+    (>= l ll)))
+
 (define (log-to* receiver log-callbacks)
   (void
    (thread
@@ -99,10 +110,11 @@
               (enqueue! log-queue (list topic level dt msg))
               (unless (null? lc)
                 (for-each (λ (log-entry)
-                            (for-each (λ (e)
-                                        (let ((callback (cdr e)))
-                                          (apply callback log-entry)))
-                                      lc)
+                            (when (needs-logging (cadr log-entry))
+                              (for-each (λ (e)
+                                          (let ((callback (cdr e)))
+                                            (apply callback log-entry)))
+                                        lc))
                             )
                           (queue->list log-queue))
                 (set! log-queue (make-queue)))