My first steps into recent versions of lilypond are ruthlessly exposing
my ignorant copy-&-paste approach to scheme...
I'm pretty sure that the following code worked fine under lilypond 2.18,
but throws errors under 2.25.0:
\version "2.25.0"
% gitver and gitrev (from
http://lilypondblog.org/2014/01/why-use-version-control-for-engraving-scores/#more-2151
)
#(use-modules (ice-9 popen))
#(use-modules (ice-9 rdelim))
% NOTE: This function only reads the first line of the command!
#(define (strsystem_internal cmd)
(let* ((port (open-input-pipe cmd))
(str (read-line port)))
(close-pipe port)
str))
#(define-markup-command (strsystem layout props cmd) (markup?)
(interpret-markup layout props
(strsystem_internal cmd)))
gitrev = \markup { \strsystem "/usr/bin/git rev-parse --short HEAD" }
\header {
tagline = \markup{
\line { "Version control for this edition: gitrev " \gitrev }
{ c'}
Under 2.25.0 I get:
Preprocessing graphical objects...
Finding the ideal number of pages...fatal: not a git repository (or any
of the parent directories): .git
programming error: Trying to interpret a non-markup object: #<eof>
despite being able to show at the command line that the .ly file really
does live in a git repo.
I've tried looking at the usual stuff (guile manual, google) but without
profit. Presumably the code above needs tweaking for guile 2, but I
could really use some help, even if it's only a pointer to a
convert-guile utility (by analogy with convert-ly).
