Re: Apply event function *within* music-function

[Urs Liska]

Am 02.05.2017 um 10:08 schrieb address@hidden:
> Wouldn't the <>\stopGroup extend the group one note too far?

Yes, but that's something I definitely can handle.

>
> On 05/02/17 10:06, Thomas Morley wrote:
>> 2017-05-02 8:29 GMT+02:00 Urs Liska <address@hidden>:
>>> Hi all,
>>>
>>> I'm trying to apply event functions to music passed into a music
>>> function
>>> like that:
>>>
>>> \version "2.19.57"
>>>
>>> test =
>>> #(define-music-function (mus)(ly:music?)
>>>     #{
>>>       #mus \startGroup
>>>     #})
>>>
>>> {
>>>    \test c' d' e' f' \stopGroup
>>> }
>>>
>>>
>>> (of course this is not what I ultimately want to achieve, but the
>>> nucleus
>>> from which I'll be able to continue on my own).
>>>
>>> This fails with "error: syntax error, unexpected EVENT_IDENTIFIER".
>>> I think
>>> it is because the #mus expression is somehow already complete
>>> (differently
>>> from when used in regular input) and I have to somehow *apply* the
>>> \startGroup event function to the #mus argument.
>>>
>>>  From \displayMusic I can see that it is added as a
>>> NoteGroupingEvent to the
>>> note's articulations, but I'd like to ask if there's a more
>>> straightforward
>>> way to attach the event to the music than rebuilding the music
>>> expression in
>>> Scheme.
>>> OTOH I will want to do that for the first *and last* element in a music
>>> expression (in order to apply the start and stop command to a
>>> sequence of
>>> notes), so I may *have* to extract the Scheme representation anyway?
>>>
>>> TIA
>>> Urs
>>
>>
>>
>> \layout {
>>    \context {
>>      \Voice
>>      \consists "Horizontal_bracket_engraver"
>>    }
>> }
>>
>> test =
>> #(define-music-function (mus)(ly:music?)
>>     #{
>>        <>\startGroup
>>        $mus
>>        <>\stopGroup
>>     #})
>>
>> {
>>    \test { c' d' e' f' }
>> }
>>
>> Should do the trick.
>>


Thanks. this is exactly what I didn't think of.
Urs

>> Cheers,
>>     Harm
>>
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