Expect a warning several times: Difference between revisions

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There are times when your LilyPond source file prints warnings when compiled and you may want to suppress these warnings from the output. LilyPond has a Scheme function for this: <code>ly:expect-warning</code>. However, there are times when the same warning is printed several times and <code>ly:expect-warning</code> will only hide one warning at a time. Typing this function several times in a row is tedious.

The Scheme function below takes a string that will match some part of the warning, just like <code>ly:expect-warning</code>, but it also takes an integer for the number of times the warning is printed.

The [https://lilypond.org/doc/v2.24/Documentation/internals/scheme-functions Scheme function] below takes a string that will match some part of the warning, just like <code>ly:expect-warning</code>, but it also takes an integer for the number of times the warning is printed.

<pre>

#(define expect-warning-times ~~(lambda args~~

#(define (expect-warning-times n . arg)

(for-each (lambda _ (apply ly:expect-warning ~~(cdr args)~~))

(for-each (lambda _ (apply ly:expect-warning arg))

(iota ~~(car args))~~)))

(iota n)))

</pre>

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<code>#(expect-warning-times 4 "omitting tuplet bracket")</code>

[[Category:Scheme]]

@@ Line 1: / Line 1: @@
 There are times when your LilyPond source file prints warnings when compiled and you may want to suppress these warnings from the output.  LilyPond has a Scheme function for this: <code>ly:expect-warning</code>. However, there are times when the same warning is printed  several times and <code>ly:expect-warning</code> will only hide one warning at a time.  Typing this function several times in a row is tedious.
-The Scheme function below takes a string that will match some part of the warning, just like <code>ly:expect-warning</code>, but it also takes an integer for the number of times the warning is printed.
+The [https://lilypond.org/doc/v2.24/Documentation/internals/scheme-functions Scheme function] below takes a string that will match some part of the warning, just like <code>ly:expect-warning</code>, but it also takes an integer for the number of times the warning is printed.
 <pre>
-#(define expect-warning-times (lambda args
+#(define (expect-warning-times n . arg)
-    (for-each (lambda _ (apply ly:expect-warning (cdr args)))
+    (for-each (lambda _ (apply ly:expect-warning arg))
-              (iota (car args)))))
+              (iota n)))
 </pre>
@@ Line 12: / Line 12: @@
 <code>#(expect-warning-times 4 "omitting tuplet bracket")</code>
+[[Category:Scheme]]