Re: mmrest-of-length and partial measures/time chnages

[Urs Liska]

Am 12.12.2016 um 10:21 schrieb Jan-Peter Voigt:
> Hi Urs,
>
> just a note: Time-signatures aren't a problem. It just have to be made
> sure, that start and end of the multi-measure-rest are placed on
> measure borders (measure position 0).
>
> Example:
> %%%
> sectionI = { \time 4/4 s1*2 | \time 3/4 s2.*2 }
> \new Staff <<
>   { \sectionI }
>   $(mmrest-of-length sectionI)
> >>
> %%%
>
> So if you check for PartialSet in the music and assure an ending on
> the last moment, at least you don't have to care about time-sigs.

Ah, OK. That makes things significantly simpler.
Thanks
Urs

>
> HTH
> Jan-Peter
>
>
> Am 12.12.2016 um 10:09 schrieb Urs Liska:
>> Hi Jan-Peter,
>>
>>
>> Am 12.12.2016 um 09:47 schrieb Jan-Peter Voigt:
>>> Hi Urs,
>>>
>>> this is a problem, I also had to deal with once in a while.
>>> As it is no daily problem, I hacked it as needed, but did build a
>>> generic solution yet.
>>> But it might be doable, *if* the music is "complete" and has a
>>> \partial command in it, which is
>>> #(make-music 'PartialSet 'duration (ly:make-duration 2))
>>> so one can fetch that music-expression and build a rest with that
>>> duration.
>>
>> Thank you for this, which is basically a confirmation of what I was
>> afraid of ;-)
>>
>>> In my hacks, I usually used a command which receives pre- and
>>> post-music expressions (e.g. the needed rests) and decreased the
>>> duration for the multi-measure-rest accordingly.
>>>
>>> If there is a \partial, you will need a function, that translates an
>>> arbitrary duration to a reasonable sequence of rests. \partial 4 is
>>> easy, but \partial 2.. or whatever needs special handling also
>>> regarding timesig.
>>>
>>> A command \multimeasureRest <pre> <music> <post> should be doable.
>>
>> Unfortunately this won't be sufficient as it wouldn't allow for time
>> changes within the music.
>> So it seems I'll have to go the way to parse the actual music expression
>> for time and partial elements and construct the rest from that. I assume
>> I'd have to split the original music expression in a list of expressions
>> and create one mmrest for each.
>>
>> However, I think this would actually warrant a proper solution, i.e. a
>> command like e.g. mmrest-of-section that can be applied to arbitrary
>> music expressions and should be added to LilyPond.
>> The question is: should this actually be an additional function or
>> should I update mmrest-of-length itself? (of course within such a new
>> function one could make good use of the existing mmrest-of-length
>> functionality for the individual sections).
>>
>> Urs
>>
>>>
>>> HTH
>>> Best
>>> Jan-Peter
>>>
>>>
>>> Am 12.12.2016 um 09:24 schrieb Urs Liska:
>>>> Hi all,
>>>>
>>>> I have a set-up where pausing sections in a part can be handled by
>>>> automatically inserting multimeasure rests whose length is
>>>> determined by
>>>> a meta variable for the sections.
>>>>
>>>> As a MWE this looks like this:
>>>>
>>>> \version "2.19.52"
>>>>
>>>> sectionOne = {
>>>>   c,1 |
>>>>   c,1
>>>> }
>>>>
>>>> {
>>>>   #(mmrest-of-length sectionOne)
>>>> }
>>>>
>>>> which nicely prints a staff with two measures of rest.
>>>>
>>>> However, when the referenced variable starts with (or actually
>>>> contains)
>>>> a partial measure, LilyPond gets confused:
>>>>
>>>> sectionTwo = {
>>>>   \partial 8
>>>>   c'8 |
>>>>   c'1 |
>>>>   c'1
>>>> }
>>>>
>>>> {
>>>>   #(mmrest-of-length sectionTwo)
>>>> }
>>>>
>>>> Of course the multi-measure rest now is 17/8 long but doesn't know
>>>> about
>>>> the partial and consequently gives me barcheck errors and wrong
>>>> output.
>>>>
>>>> The same is true when the referenced variable contains music in other
>>>> than 4/4 time signature because mmrest-of-length by default seems to
>>>> produce 4/4 rests.
>>>> I can't simply add a \time command in front of the mmrest because this
>>>> is actually a complex set-up where the variables are retrieved from
>>>> previously parsed music expressions.
>>>>
>>>> So my question is: is there a reliable and more or less convenient way
>>>> to produce a "rest" part/section from a referenced section, regardless
>>>> of what's in there. I think basically there are two approaches:
>>>> a)
>>>> analyse the music expression for partials and time changes
>>>> b)
>>>> copying the music but replace everything with rests.
>>>>
>>>> Any pointers would be appreciated
>>>>
>>>> Best
>>>> Urs
>
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