Re: Guitar tablature for LilyPond !

[Rune Zedeler]

Lamy Jean-Baptiste wrote:

> > I have made some kludgy drum notation using scheme - see 
> > input/test/drums.ly - and probably you could use something likewise to 
> > move around the noteheads in the guitar staff.
>
>
> I've tried that, but it seems broken...

??? What happens if you "ly2dvi drums.ly"?

> I've started to write such an engraver (based on the note heads engraver),
> and i've added a music property called "tab_string". Now, the problem is
> that i don't know how to change this property in Scheme or in the .ly
> file...

If you use a translator property, you can change it from within lilypond 
with

\property Staff.tabString = #3

and in the engraver you can read the property with

SCM tab_string = get_property("tabString");
int tab_string_i = scm2int(tab_string);

> By the way, from where the engraver are created ? grep-ing inthe code
> doesn't give anything, and i know lex/bison code even less than
> c/c++...

You add the engraver from withing a paper-translator.
If you wan't to replace the Note_heads_engraver with i.e. 
Tab_heads_engraver, you simply say

\paper {
  \translator {
    \StaffContext
    \remove "Note_heads_engraver"
    \consists "Tab_heads_engraver"
  }
}

Check out ly/engraver-init.ly

to see the definitions of all the default translators.

-Rune