Re: [Lilypond-auto] Issue 3176 in lilypond: Add tempo spanners

[lilypond]

Comment #2 on issue 3176 by address@hidden: Add tempo spanners
https://code.google.com/p/lilypond/issues/detail?id=3176

One of the mailing threads above asks for a syntax proposal.
I think it’s good to keep this in line with current \tempo indications,  
that is, no postfix notation but an event on its own which comes before the  
notes.
Personally I’d prefer a threefold distinction here:
– \tempo for absolute tempo indications (as is).
– \agogicMark for relative tempo indications like "rit." or "broader", to  
be printed in medium italic letters.
– \agogicSpanner for relative tempo indications spanning some time  
like "rit. - - -" or even "al -- lar -- gan -- do".

Pseudo code:

{
  \tempo "Allegro"
  4 \agogicMark "accel." 4 4 4
  \agogicSpanner "rit." 4 4 4 4
  \tempo "Poco più lento"
  1
}

roughly equivalent (in a single-staff system) to

{
  \tempo "Allegro"
  4 4^\markup \italic "accel." 4 4
  4-\tweak bound-details.left.text "rit." \startTextSpan 4 4 4
  \tempo "Poco più lento"
  1\stopTextSpan
}

– the difference being that \agogicMark and \agogicSpanner would be  
collected above the topmost staff, and \tempo and \agogicMark would  
automatically end \agogicSpanner (perhaps it should be possible to turn  
that off, though).

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