Noeck <noeck.marb...@gmx.de> writes:
> A bit more of Mutopia statistics:
>
> 4157 .ly files on Mutopia don't use << \\ >>
> 1130 .ly files on Mutopia do
> 307 of the latter have only one \\, so the can't be affected by a change
> The other 823 possible could be affected but most of them use only two
> voices in one construct but several such constructs.
>
> By the way, the top position with 369 double backslashes is this piece:
> https://github.com/MutopiaProject/MutopiaProject/blob/master/ftp/BachJS/BWV830/BWV-830/BWV-830-lys/BWV-830.ly
This particular one is... horrific.
upper = \relative e
{
\clef treble
\key e \minor
\time 2/2
\ntbo #16.5 \times 4/7 { \bc e16[ g b e] \tc \su g[ b e] } g8. g16 << { g 4
fs } \\
{ a,2
} \\
{ c 2
} >> | % 1
\sn
\ntbo #15.5 \times 4/7 { \bc ds,,16[ fs a c] \tc ds[ fs g] } a8. a16 << { a
4 g } \\
{
} \\
{ fs
4 e _\mordent } \\
{
} \\
{
ds!4 s } >> | % 2
Let's take a look what conventions are employed here in the first two
<<\\>> things. First the voices left empty (ugh) strongly suggest that
the person entering the code is aware of the up/down pattern of input.
Also the code suggest that the person is more acquainted with LilyPond's
abilities than good for the readability of their code. Let's take a
look at the pitches (relative mode):
<< { g 4 fs } \\
{ a,2 } \\
{ c 2 } >> | % 1
top, bottom, middle: correct
<< { a 4 g } \\
{ } \\
{ fs 4 e _\mordent } \\
{ } \\
{ ds!4 s } >> | % 2
Ugh what? All of the non-empty ones are stemup. Order:
top, middle, bottom: within the stemup stacking correct but what an
awful input. And why everything stemup?
Let's take the next two examples:
<< { g16. \beams #2 #3 fs32 \beams #3 #3 e fs g16 cs,4 \prall } \\
{ cs,2 } \\
{ \shortStem #4.5 a'2 } \\
{ } \\
{ e2 } >> | % 5
Order: top, bottom, high, --none--, low
One thing that is obvious that \relative pitch is a real mess to keep
track of in this kind of highest/lowest/high/low scheme. It works quite
more natural in high-to-low stackings.
<< { fs16. \beams #2 #3 e32 \beams #3 #3 d e fs16 b,4 \prall } \\
{ d,2 } \\
{ \shortStem #5 g2 } >> | % 6
Correct as far as I can see.
So this most exuberant example does not get anything wrong as far as a
first glance would suggest. It's also ugly as hell.
At any rate, the \relative problem means that a convert-ly rule actually
reordering things would be a really, really complex feat.
--
David Kastrup
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