Re: Interactive compiling

[David Kastrup]

"Joao E. Pereira Jr" <address@hidden> writes:

> Hi team,
>
> Most lilypond GUI projects (Frescobaldi, Denemo) I have seen implement
> a wrapper in lilypond. I am investigating the possibility to transform
> lilypond in a more interactive compiler. I have little understanding
> of the code for now, and noticed that before start to parse
> Lily_parser executes a huge amount of code loading init.ly and his
> sons. Could that loading process be isolated, pre executed and
> maintained in memory to serve posterior requests?

You might want to look at how LilyPond deals with multiple files on the
command line and the -djob-count option.

> Following the same thinking line could the data structure (contexts,
> music, property, graphical objects) be maintained in memory and
> changed as user input changes. Some user changes would affect only one
> graphical object and maybe trigger a reformatting, others would affect
> a property object and trigger a partial recompiling, others would
> affect the ly file and require compiling from scratch.

The bookkeeping for that kind of thing would likely be prohibitively
expensive.

> I may be saying a lot of non sense, but I would like to know in
> details why is this a bad (very bad) idea!

The only way to know in detail is to try.

-- 
David Kastrup