Hello Urs,
On 14.02.2013 20:50, Urs Liska wrote:
Hi list,
maybe it's an academic question, but maybe it also triggers the
curiosity of some Scheme-hackers ;-)
I wouldn't call it academic - if want to build some kind of workflow,
you will face the need for creating several pdfs from one ly-file.
Is it possible to write something (probably a Scheme function) that
lets LilyPond compile a file twice with a different file included or a
different command line option?
... you can process a book object in scheme as often you like
(ly:process-book)
Or is it possible from within a document to launch a second LilyPond
instance with an arbitrary command line option set?
You can play with schemes 'system' command, but I wouldn't use that, to
call lilypond - it is already running.
The background is: I want to create a scenario where I can compile two
different pdf files in one run. The two files should have a different
first-page-number and a different filename suffix. I would like to
have two versions of a score starting on odd and even pages.
(Afterwards I want to include the appropriate file in a LaTeX
document, depending on the page in the document.)
I can imagine doing this with two layout include files (like
'start-odd.ily' and 'start-even.ily') or with a function that directly
writes the right commands depending on command line options (like
'-dstartodd' or 'dstarteven').
So maybe the easiest way would be to have a function that triggers two
separate lilypond runs on the same file, providing different command
line options. I'd then have a main .ly file as usual that includes one
of two style sheets depending on the presence of command line options,
but I would explicitely run lilypond on a 'master' file that doesn't
actually contain music but only controls the build process.
My approach is using a book variable. A scheme-function then sets all
given paper vars in the book paper before it starts processing it with
ly:process-book. The example file creates writeBook.pdf (odd version),
writeBook-even.pdf and writeBook-music.midi.
HTH
Best, Jan-Peter
\version "2.16.0"
% process a book with ly:book-process
% book - the book
% paper - the paper
% layout - layout or midi block
writeBook =
#(define-void-function (parser location book paper layout file)
(ly:book? list? ly:output-def? string?)
; set all given paper vars in book paper
(for-each (lambda (p)
(if (pair? p)
(ly:output-def-set-variable! (ly:book-paper book) (car p)(cdr p))))
paper)
(ly:book-process book #{ \paper {} #} layout file))
% get the current output name
myname = #(ly:parser-output-name parser)
% our book
mybook = \book {
\paper {
% odd/even header with pagenumber
oddHeaderMarkup = \markup \fill-line {
\null \bold \fromproperty #'page:page-number-string
}
evenHeaderMarkup = \markup \fill-line {
\bold \fromproperty #'page:page-number-string \null
}
}
% innovative music
\relative c'' {
bes4 a c b cis a fis d c1
}
}
% write a pdf with first-page-number = 3 (odd)
% no to 'odd' suffix, to let frescobaldi display the result
\writeBook #mybook #'((first-page-number . 3)) \layout {} #(format "~A" myname)
% write a pdf with first-page-number = 2 (even)
\writeBook #mybook #'((first-page-number . 2)) \layout {} #(format "~A-even" myname)
% write a midi file
\writeBook #mybook #'() \midi {
\tempo 4 = 120
} #(format "~A-music" myname)
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