Make level a keyword argument for with-logging-to-port.

collects/unstable/logging.rkt

@@ -11,7 +11,7 @@
 ;;     (log-warning "not ok")
 ;;   If the logging on the last line is executed before the thread listening
 ;;   to the logs sees the stop message, "not ok" will also be sent to port.
-(define (with-logging-to-port port level proc)
+(define (with-logging-to-port port proc #:level [level 'debug])
   (let* ([logger    (make-logger #f (current-logger))]
          [receiver  (make-log-receiver logger level)]
          [stop-chan (make-channel)]
@@ -41,7 +41,6 @@
       (thread-wait t))))
 
 (provide/contract [with-logging-to-port
-                   (-> output-port?
-                       (or/c 'fatal 'error 'warning 'info 'debug)
-                       (-> any)
-                       any)])
+                   (->* (output-port? (-> any))
+                        (#:level (or/c 'fatal 'error 'warning 'info 'debug))
+                        any)])

collects/unstable/scribblings/logging.scrbl

@@ -10,9 +10,9 @@ This module provides tools for logging.
 
 @unstable[@author+email["Vincent St-Amour" "stamourv@racket-lang.org"]]
 
-@defproc[(with-logging-to-port [port output-port?]
-                               [level (or/c 'fatal 'error 'warning 'info 'debug)]
-			       [proc (-> any)])
+@defproc[(with-logging-to-port
+           [port output-port?] [proc (-> any)]
+           [#:level level (or/c 'fatal 'error 'warning 'info 'debug) 'info])
          any]{
 
 Runs @racket[proc], outputting any logging of level @racket[level] or higher to
@@ -21,10 +21,11 @@ Runs @racket[proc], outputting any logging of level @racket[level] or higher to
 @defexamples[
 #:eval (eval/require 'unstable/logging)
 (let ([my-log (open-output-string)])
-  (with-logging-to-port my-log 'warning
+  (with-logging-to-port my-log
     (lambda ()
       (log-warning "Warning World!")
-      (+ 2 2)))
+      (+ 2 2))
+    #:level 'warning)
   (display (get-output-string my-log)))
 ]