Re: Some "Cheat cheet" nitpicks

[Sven Axelsson]

2009/12/15 Graham Percival <address@hidden>

> On Tue, Dec 15, 2009 at 09:55:10AM +0100, Werner LEMBERG wrote:
> >
> > [all lilypond documentation snippets running through lilypond-book get
> > a horizontal offset of 3mm to the right]
> >
> > > We have code that detects if the example is a single line; if so, it
> > > adds ragged-right=##t.
> >
> > I think you are wrong; at least I haven't found anything into this
> > direction in lilypond-book.  It only suppresses ragged-right output if
> > a line width is given.
>
> It's part of the lilypond binary (or scheme functions) itself, not
> lilypond-book.
>
> http://lists.gnu.org/archive/html/lilypond-devel/2008-03/msg00097.html
>
> I don't know exactly when it was implemented, but we spent a lot
> of time removing [ragged-right] from the docs, so it definitely
> *was* implemented.
>
> > > That same piece of code could set left-padding to 0.
> >
> > `This piece of code' has to be written yet, I believe.  However, I
> > think it's a bad idea in general since it means that you have to run
> > lilypond twice on a single snippet: the first time to find out whether
> > there is more than a single line, and the second time to apply
> > left-padding.
>
> I have no clue how Joe worked his magic, but I trust that he did
> it the proper way.  :)   (or else he and Han-Wen decided that the
> initial spacing could be done fast enough that it wouldn't matter)
>


Jyst FYI: the code in question is in lily/constrained-breaking.cc
in SHA 6673b8fee.

The patch looks like this:

 +  /* As a special case, if there is only one line in the score and
ragged-right
+     hasn't been specifically forbidden and the line is stretched, use
+     ragged spacing. */
+  if (last && i == 0
+      && lines_.at (i, j).force_ >= 0
+      && !scm_is_bool (pscore_->layout ()->c_variable ("ragged-right"))
+      && !scm_is_bool (pscore_->layout ()->c_variable ("ragged-last")))
+    ragged = true;

-- 
Sven Axelsson
++++++++++[>++++++++++>+++++++++++>++++++++++>++++++
>++++<<<<<-]>++++.+.++++.>+++++.>+.<<-.>>+.>++++.<<.
+++.>-.<<++.>>----.<++.>>>++++++.<<<<.>>++++.<----.