Re: imperfect convert-ly rules

[Keith E OHara]

On Thu, 18 Nov 2010 14:15:49 -0800, Keith E OHara wrote:

> Let's also change paper-defaults-init.ly so that \mm really means millimetres :
>    mm = #(/ 1.0 staff-space)

Gosh, no.  That was a mistake, because 'indent' and 'top-margin' and such 
things are still entered in mm (quite sensibly).  The current definitions of 
mm, in, etc., need to stay as they are, for use with these variables.

> My request is that
>    between-system-padding = 5\mm
> be converted to
>    system-system-spacing #'padding = 5\mm

I take that back as well.  I don't actually *want* to express these spaces in 
mm; I was only following the old manual.

Now I see the value in a non-naive conversion that would produce something like 
:
 between-system-padding = 5\mm
 system-system-spacing #'padding = #(/ between-system-padding staff-space)

If this gets into the tracker, the extension below of Neil's example would be a 
good test-case.  If we can fix the spurious warnings about minimum-Y-extent at 
the same time, then the snippet below should convert-ly with no error messages.

--8<--
\version "2.13.9"
\paper {
  between-system-padding = 10\mm
  between-system-space = 0
}
\score {
  \relative c'' {
    c1 \break
    c1
 }
 \layout { \context { \Lyrics
   \override LyricText #'minimum-Y-extent = #'(-1 . 2)
}}}