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

From: Jean Abou Samra
Subject: Re: (top-repl): suggestions for a demo?
Date: Wed, 28 Dec 2022 12:26:15 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.0

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 ""

{ \mus }

$ ~/lilies/2.24.0/bin/lilypond
GNU LilyPond 2.24.0 (running Guile 2.2)
Processing `'
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)
  (list (make-music
          (ly:make-duration 0)
          (ly:make-pitch 0 0))
          (list (make-music 'CrescendoEvent 'span-direction -1)))
            (list (make-music
                    (list (make-music
                            (ly:make-duration 2))
                            (list (make-music
                    (ly:make-duration 1)
                    (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.


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