Re: (top-repl): suggestions for a demo?

[Jean Abou Samra]

Le 19/12/2022 à 01:59, Eduardo Ochs a écrit :
> Can anyone give me some examples of how to use the REPL to inspect
> some interesting variables and data structures? I am hoping to get
> something like a 5-line demo that I can use as a starting point...

This is a late reply, but try this:

\version "2.24.0"

mus = { c'1 <>\< \after 4 \! d'2 }

\include "scheme-sandbox.ly"

{ \mus }




$ ~/lilies/2.24.0/bin/lilypond test.ly
GNU LilyPond 2.24.0 (running Guile 2.2)
Processing `test.ly'
Parsing...
GNU Guile 2.2.7
Copyright (C) 1995-2019 Free Software Foundation, Inc.

Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.

Enter `,help' for help.
scheme@(#{ g100}#)> mus
[lots of output deleted]
scheme@(#{ g100}#)> (display-scheme-music mus)
(make-music
  'SequentialMusic
  'elements
  (list (make-music
          'NoteEvent
          'duration
          (ly:make-duration 0)
          'pitch
          (ly:make-pitch 0 0))
        (make-music
          'EventChord
          'elements
          (list (make-music 'CrescendoEvent 'span-direction -1)))
        (make-music
          'ContextSpeccedMusic
          'property-operations
          '()
          'context-type
          'Bottom
          'element
          (make-music
            'SimultaneousMusic
            'elements
            (list (make-music
                    'SequentialMusic
                    'elements
                    (list (make-music
                            'SkipMusic
                            'duration
                            (ly:make-duration 2))
                          (make-music
                            'EventChord
                            'elements
                            (list (make-music
                                    'CrescendoEvent
                                    'span-direction
                                    1)))))
                  (make-music
                    'NoteEvent
                    'duration
                    (ly:make-duration 1)
                    'pitch
                    (ly:make-pitch 0 1)))))))

scheme@(#{ g100}#)> (display-lily-music mus)
{ c'1 < >\< \after 4 \! d'2 }
scheme@(#{ g100}#)> (exit)

Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Converting to `test.pdf'...
Success: compilation successfully completed




Keep in mind, though, that LilyPond doesn't operate in a single pass,
so "what LilyPond knows about the file at the current point" isn't
all that much: it has just desugared some high-level constructs like
\after into simpler music expressions. The story of what happens to
those music expressions afterwards is complicated.


Best,
Jean

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