On Fri, 2023-01-06 at 23:19 +0100, Han-Wen Nienhuys wrote: > On Fri, Jan 6, 2023 at 10:19 AM Jonas Hahnfeld <hah...@hahnjo.de> wrote: > > > > On Wed, 2023-01-04 at 12:52 +0100, Han-Wen Nienhuys wrote: > > > Regarding versioning: the 1.x to 2.x transition was motivated by > > > radical syntax changes that necessitated converting and 'manually' > > > verifying the .ly files. Since Cairo vs. Ghostscript doesn't affect > > > the semantics of .ly files, I think we can continue the 2.x version > > > number. As a practical example, page layout was introduced in 2.4, and > > > direct to PostScript only became default in 2.6; both changes are much > > > more invasive than what we are discussing here. > > > > Regardless of what has been done in prior versions, it seems to me the > > cleanest solution still is to remove a number of markup commands that > > we cannot or do not want to support with Cairo. We know some are used > > in existing libraries and scores, so this constitutes a breaking > > change. What exactly is your argument for *not* going to version 3.x in > > that case? > > I don't think there is value in removing markup commands. When we drop > the PS backend, folks that use \postscript or \epsfile can do > > lilypond --ps foo.ly && ps2pdf foo.ps > > rather than > > lilypond foo.ly > > and have their scores mostly work. We don't need to remove support for > this, ever. Since this doesn't break backward compatibility, I don't > think we need a major version bump.
For me, this meets *exactly* the definition of a backward incompatibility: Something that used to work (just running lilypond foo.ly to get a PDF) doesn't give the expected result anymore. Furthermore, I'm not a fan of recommending two different ways of creating PDFs to users (once directly via Cairo and once with ps2pdf), unless we really, really have to. I can also buy Werner's arguments about a fundamental change, and I would use the jump to advertise as such, but for me the purely objective reason are backwards incompatibilities that we *will* have when going to Cairo.
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