Re: fatal error: define-session used after session start with LSR 392

[David Kastrup]

Eluze <address@hidden> writes:

> hi
>
> with the code of snippet http://lsr.dsi.unimi.it/LSR/Item?id=392
>
> invoked on the command line
>
> "c:\program files (x86)\lilypond2.17.11\usr\bin\lilypond.exe" myfile.ly
>
> I get
>
> fatal error: define-session used after session start
>
> versions before have no problem
>
> any clues?

The code is not just messing with internals, it is _reloading_
internals.  Ugh.  Here is a version that "merely" messes with internals:

\header { title = "Creating the list of all supported midi instruments" }

% We apply a lambda function to the list (instrument-names-alist) of instrument 
definitions
% That function simply creates a markup containing the name as a simple string 
(the first 
% entry of the instrument definition is the name, thus the (car instr).
% Since we return a list of markups, we have to define that function as a 
markup-list command

#(define-markup-list-command (midi-instruments-markup-list layout props) ()
  (interpret-markup-list layout props
    (map (lambda (instr) (markup (car instr))) (@@ (lily) 
instrument-names-alist))))

% simply display the list of markups generated by the function above
\markuplist \midi-instruments-markup-list

But in truth: it does not make much sense that the instrument name data
is not publicly available, possibly via a separate function.

-- 
David Kastrup