Duck util-stdout.

doc/d-utils.md

@@ -183,3 +183,38 @@ Executes given command ```cmd``` with given argument list ```args```
 writing all ```lines``` to its standard input and then reads all the
 process output.
 
+
+## util-stdout [module]
+
+    (import util-stdout)
+
+Very simple module wrapping standard output.
+
+### *stdout-quiet* [parameter]
+
+    (define *stdout-quiet* (make-parameter #f))
+    (*stdout-quiet*)
+    (*stdout-quiet* quiet)
+
+A boolean parameter which disables all output from procedures in this
+module if its value is ```#t```.
+
+### stdout-print [procedure]
+
+    (stdout-print . args)
+
+If not quiet, passes ```args``` to ```print```.
+
+### stdout-printf [procedure]
+
+    (stdout-printf fmt
+                   . args)
+
+If not quiet, prints formatted string ```fmt``` by applying ```args```
+to ```format``` procedure.
+
+### stdout-newline [procedure]
+
+    (stdout-newline)
+
+If not quiet, calls ```(newline)```.