"Trevor Daniels" <t.dani...@treda.co.uk> writes: > Prompted by the recent discussion on lute tablature, I tried coding a > Scheme engraver to create the duration grobs but quickly ran into a > problem. I need to collect information from both a Listener and an > Acknowledger so the obvious place to build the grob is in > stop-translator-timestep,
No, no, no. stop-translator-timestep really is only for cleanup work. Stuff is no longer in working order then. You want process-acknowledged here I think. There will always be a call to process-acknowledged whenever grobs have been created, and _reading_ stuff from grobs should be delayed until then since other acknowledgers might _write_ stuff into a grob even after your personal acknowledger has been called. So the basic workflow is to use the various acknowledgers to _record_ the grobs you are interested in and _write_ stuff into them (or do read/write stuff that more or less is accumulative and/or really unrelated to other engravers), and then use the process-acknowledged hook for processing (including _reading_) the grobs you had recorded. You can create new grobs in process-acknowledged. That will lead to a new cycle of acknowledger calls followed by process-acknowledged. Only when all those cycles are over is stop-translator-timestep called, and then creating grobs is no longer an option. -- David Kastrup _______________________________________________ lilypond-devel mailing list lilypond-devel@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-devel
