On Mon, 2017-06-05 at 18:34 +0200, David Kastrup wrote:
> Richard Shann <rich...@rshann.plus.com> writes:
>
> > On Sun, 2017-06-04 at 17:48 +0200, Simon Albrecht wrote:
> >> On 04.06.2017 15:50, Knute Snortum wrote:
> >> > I post to Mutopia so I can't have warnings. Any thoughts?
> >>
> >> Sometimes one has to accept warnings, so in future situations
> >> ly:expect-warning might be your friend (unless it is banned from
> >> Mutopia? I’d be surprised). It only needs the beginning of the warning
> >> string, like
> >> #(ly:expect-warning "cannot have")
> >
> > Simon - I was intrigued by this comment of yours and wondered if you
> > could say where this bit of Scheme needs to be placed?.
> > I tried to suppress clashing note column warnings thus:
> >
> > 8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><
> > \version "2.18.0"
> > #(ly:expect-warning (_ "ignoring too many clashing note columns"))
> > MvmntIVoiceI = {
> > #(ly:expect-warning (_ "ignoring too many clashing note columns"))
> > c''4 c'' c''
> > }
> > MvmntIVoiceII = {
> > #(ly:expect-warning (_ "ignoring too many clashing note columns"))
> > c''4 c'' c''
> > }
> > \score {
> > \new Staff = "Part 1" <<
> > \new Voice = "MvmntIVoiceI"
> > \MvmntIVoiceI
> > \new Voice = "MvmntIVoiceII"
> > \MvmntIVoiceII
> > >>
> > }
> > 8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><
> >
> > I found by trial-and-error that if I remove any of the three occurrences
> > of the ly:expect-warning the warning returns.
> >
> > Where should it be called?
>
> At the top, once for every expected warning. It doesn't make sense
> placing it in music expressions: its effect will be immediate anyway and
> it does not become part of the music.
>
> But you need to expect the right order
> and number of warnings.
Ah, repeated calls to ly:expect-warning increment a counter for the
number of such warnings to be expected.
Thanks very much for this information.
Suggested update to docs:
Function: ly:expect-warning format-str rest
A Scheme callable function to register a warning to be expected and
subsequently suppressed. If the warning is not encountered, a warning
about the missing warning will be shown. The format-str should be
translated with (_ ...) and rest should be any parameters expected by
format-str. The number and ordering of calls should match the number and
order of warnings to be suppressed.
Richard
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