After some searching, I’ve found that Scheme has the define-once construct which does exactly what I was looking for
✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝ Fr. Samuel, OSB (R. Padraic Springuel) St. Anselm’s Abbey 4501 South Dakota Ave, NE Washington, DC, 20017 202-269-2300 (c) 202-853-7036 PAX ☧ ΧΡΙΣΤΟΣ > On Feb 15, 2023, at 2:54 PM, Fr. Samuel Springuel <rpspring...@gmail.com> > wrote: > > I recently upgraded from 2.22 to 2.24 and have run into some problems with > one of my tools. The tool is set up to define some some stuff (in the > example attached below I’ve narrowed it down to be just a color), but only if > that thing is not already defined. The reason for this is because the > definitions are in included files. There’s a master style file which defines > everything and then a variant style file where only some things are defined > (the things that are different from the master style file). The master style > file is included explicitly in the source files, while the variant style file > is included automatically by lyluatex if certain conditions are met in the > document, and that inclusion happens before the contents of the source file. > This means I have to prevent a redefinition rather than exploit it. I was > doing this just fine in 2.22, but 2.24 complains about definition being > wrapped in a conditional. I believe this has to do with the switchover in > Guile versions, but I don’t know enough about Guile to figure out how to fix > it (and no, convert-ly does not help here). > > Attached is my MWE. > > ✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝ > Fr. Samuel, OSB > (R. Padraic Springuel) > St. Anselm’s Abbey > 4501 South Dakota Ave, NE > Washington, DC, 20017 > 202-269-2300 > (c) 202-853-7036 > > PAX ☧ ΧΡΙΣΤΟΣ > <aster_test.ily>
