2011/8/19 Carl Sorensen <c_soren...@byu.edu>: > On 8/19/11 10:15 AM, "David Kastrup" <d...@gnu.org> wrote: >> >> Up to now, \once \revert is not really documented nor used. I have not >> yet dug through the existing code in order to figure out what it does if >> anything (most likely ignoring \once, but not sure). > > I would expect that \once \revert would revert an \override for the current > time step only (meaning events whose start time is the current moment). For > any events whose start time is other than the current moment, the \override > would continue to apply.
+1 >> In order to not have the override/revert stack get into unexpected >> interactions, I want to change \once\override to be impervious to normal >> reverts. > > This seems to me to be a wise decision. \once \override is a statement that > you are creating an override for everything happening at the current moment; > reverts would not seem to apply. +1 >> That would mean that \once\revert is an obvious candidate for reverting >> a \once\override before its time. However, I have no idea whether there >> is an actual sensible use for that functionality. > > I can see no sensible use for that functionality. You would have > conflicting statements about what should happen at this time. +1 >> \once\revert could also mean to let a current non-once override become >> inactive just for the current time step. > > As I mentioned above, I think this is the logically consistent meaning. +1 >> IF one wanted to get crazy, one could use \once\revert for one of the >> two things, and \revert\once for the other. Which one for which, and >> would anybody remember that? > > I agree that this would be crazy. But if we were going to do it, \once > \revert should revert an \override, but only for the current moment, and > \revert \once should revert a \once \override, IMO. But I would not be in > favor of this proposal. +1 > In fact, I think I would be in favor of removing \once \revert from the > parser. The semantics of \once \revert can be confusing, and the same > behavior could be achieved with a \once \override. But I would be open to > arguments from those who see good uses of \once \revert. +0.5, i'm not sure. I see that there is more advanced discussion going on, but i cannot dive into it now. Maybe later. cheers, Janek _______________________________________________ lilypond-devel mailing list lilypond-devel@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-devel
