Re: 48 and 72 ET

[Hans Åberg]

> On 10 Feb 2017, at 00:34, Urs Liska <address@hidden> wrote:
> 
> Am 10.02.2017 um 00:22 schrieb Hans Åberg:
>>> So is there any reason people don't use convert-ly when upgrading to a
>>> newer version?
>>> 
>> For libraries, you would want to keep track of the changes, but running 
>> convert-ly and do a diff is a good suggestion. Though doing it by hand was 
>> quicker, as I remembered the issue and which files needed to be fixed.
>> 
>> In general, though, perhaps people maybe do not think or know about it, so 
>> the process might be automated.
>> 
>> 
> 
> When maintaining libraries one should want to make them compatible with 
> multiple LilyPond versions, IMO at least with the current stable and devel 
> version, but depending on the use case and target audience one might even 
> support the previous stable release.
> In order to be able to do that in openLilyLib I created the version 
> comparison operators/predicates 
> (https://github.com/openlilylib/oll-core/blob/master/internal/lilypond-version-predicates.scm)
>  which make it easy to write switches based on the currently run LilyPond 
> version.
> 
> I intend to create a patch to include this functionality into LilyPond, but 
> so far I'm not really sure *where* these functions should be defined and 
> where they could adequately be documented.

For regular.ly, Graham made it originally for an earlier LilyPond version only. 
I then was able to make it for latest LilyPond, but not updating it. But now, 
it works for latest LilyPond again. So there a certain span of versions, here.