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

[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.
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.

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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