Re: fixed vs relative

[Urs Liska]

Am 10.05.19 um 02:46 schrieb David Wright:
> > > > You know that Frescobaldi can convert absolute to relative and vice
> > > versa?
> > >
> > > As can the   ly   standalone (derived from F~ possibly).
> > Sorry I don't understand.
> ly, packaged as python3-ly in Debian, has a number of commands hived
> off (I assume) from Fresco including: re-indent, reformat, translate
> the language, transpose, abs2rel, rel2abs, simplify-accidentals, etc.

Originally ly was the module *inside* Frescobaldi handling all the stuff 
relating to the LilyPond input code. This includes functions like code 
formatting, musical changes, trying to keep track of where we are in the 
music etc.

At some point Wilbert decided to a) remove any dependencies on Qt (the 
application development framework used in Frescobaldi) from that code, 
b) factor it out into an external module and c) make a standalone script 
wrapping some of its functionality.

So a number of functions are available through that 'ly' command line 
script, and it's also possible to 'import ly' in Python programs. At 
some later point I also added an HTTP server wrapper so you could 
actually use 'ly' in a web application to submit your LilyPond code for 
processing in a website.

When Frescobaldi decided to completely move to Python 3, dropping all 
Python 2 compatibility efforts this was deliberately *not* applied to 
python-ly, so that is a plain Python 2/3 library that can be used from 
both Python versions, without any PyQt dependencies.

Just for some clarification.
Urs