Re: convert-ly warnings too global

[Jean Abou Samra]

Le dimanche 26 février 2023 à 10:55 +0000, Werner LEMBERG a écrit :
> If I do
> 
> ```
> convert-ly en/notation/rhythms.itely > /dev/null
> ```
> 
> I get the following two warnings.
> 
> 
> ```
> Not smart enough to convert music following \fine.
> 
> Warning: \fine no longer enforces the end of the music.  If your piece
> has music following \fine that you want to exclude when it is
> unfolded, use \volta to exclude it.
> Please refer to the manual for details, and update manually.
> 
> Not smart enough to convert BreathingSign to Divisio.
> 
> MensuralStaff and VaticanaStaff now use Divisio_engraver to engrave
> divisiones as Divisio grobs.
> 
> Previously, the respective Voice-aliased contexts used
> Breathing_sign_engraver to engrave divisiones as BreathingSign grobs.
> Because of the new names and the move from Voice to Staff, layout
> adjustments for the old scheme are not effective for the new.
> 
> If you are not content with the new default layout, deal with Divisio
> and Divisio_engraver in the appropriate Staff-aliased context.
> Please refer to the manual for details, and update manually.
> ```
> 
> 
> AFAICS, these warnings are unfounded; they are rather artifacts of
> `convert-ly`, which applies regular expressions 'too globally'.
> 
> Is there any chance to fix this (i.e., improve the heuristics)?
> 
> BTW, a similar issue happens if I process
> `en/notation/changing-defaults.itely` with `convert-ly`:
> 
> ```
> Not smart enough to convert BreathingSign to BarLine or Divisio.
> ```


There was thought put into those heuristics and I think they are as good as 
they can be. Perhaps the improvement we could make would be parsing tely files 
with the same code as lilypond-book and only applying the heuristics to each 
fragment. But that's not really a user-facing problem, except for those who use 
Texinfo + lilypond-book for their own purposes.

We could include a line number in the warnings too. However, when they are 
triggered by several conditions simultaneously, it's not always clear where to 
attach it.

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