Re: showLastLength as a command-line option?

[Jonathan Kulp]

Well, I didn't get enough info from this posting to do what I originally 
wanted to do (i.e. hack Lilypond itself to add this option--it would 
have been enough if I knew anything about programming, I guess), but 
I've come up with a way to specify showLastLength at the command line 
using the script that I normally use to invoke lilypond.  This works 
equally well on Mac and Linux.  I guess it would take something 
completely different to work on Windows, though.  Don't really know 
about that.

So I've added some code that allows use of an argument that is captured 
and passed to a temporary file so it can be used by a lilypond source 
file.  To make use of this function, add the following line near the top 
of your source file:

\include "showlast.ly"

You don't actually have to *have* the showlast.ly file anywhere on your 
system, as it's created on the fly by the script, so that it's present 
when lilypond is called, and then when the script is done, the 
showlast.ly file is deleted.  Specify the duration of the last length 
the same way you would if you were putting it in your source file.  R1*8 
is eight whole-rest bars.  R2.*8 would be 8 bars of dotted-half-rests. 
Here's an example of how to run it:

lily -l=R1*12 filename.ly

The R1*12 value is passed to the temporary file, and when lilypond is 
called, it only renders the last 12 bars.

If you just do "lily filename.ly", then the script creates an empty 
showlast.ly file so that no "showLastLength" variable is set and the 
source file is run normally.

Now, I've specified acrobat reader for previewing the file in Linux so 
if you prefer another viewer you can say "xdg-open" or "evince" in its 
place.  On Mac I use the default Preview app.

Give it a try!

Jon

Jonathan Kulp wrote:
> Thanks for replying, Han-Wen.  I can't find showLastLength anywhere in 
> that file, though.  Searches for showlast and show-last came up empty. 
> It looks like the file is inside the SCM directory but I can't tell 
> where.  Here's the search I did:
>
> address@hidden:/usr/local/share/lilypond/2.11.59/scm$ cat *.scm | grep 
> -i showlast
>      LENGTHOF(\\showLastLength)
>       ((show-last  (ly:parser-lookup parser 'showLastLength)))
>
> So it shows that showLastLength is there, but it doesn't say which file 
> it's in (my skills at the shell are such that I don't know how to make 
> it tell me this.  Sigh...).  Can you tell from this output where it is?
>
> Jon
>
> Han-Wen Nienhuys wrote:
> > > Can anyone point me in the right direction to accomplish this great 
> > > idea?!
> > > ;)
> >
> > > > > > Would it be possible technically to specify the showLastLength value
> > > > > > when
> > > > > > invoking lilypond instead of putting it in the .ly file?  
> > > > > > Something like
> >
> >
> > look at lily.scm to see where the -d options are defined.  At some
> > point showLastLength is initialized; that's where you should do
> >
> >   (ly:get-option 'show-last-length)

--
Jonathan Kulp
http://www.jonathankulp.com

lily
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