Re: A Javascript test code for modifying ties and slurs with mouse

[Aaron Hill]

On 2019-12-14 6:16 am, Paolo Prete wrote:
> However, how can I make it work for multiple pages output?

Another approach would be to modify how LilyPond generates SVG output, 
so that the script in question is inserted just before the closing 
</svg> element:

%%%%
\version "2.19.83"

svg-script = #(define-void-function (body) (string?)
  (let* ((mod (resolve-module '(scm framework-svg)))
         (svg-end (module-ref mod 'svg-end #f)))
    (if (procedure? svg-end)
      (module-define! mod 'svg-end (lambda () (string-join
        (list "<script type=\"text/javascript\"><![CDATA["
              body "]]></script>" (svg-end)) "\n"))))))

\svg-script #"// TODO: Insert script here."
%%%%

This is improved in that no \markup is required.  This injection of 
content happens at a point after LilyPond has processed each page of 
music, so there are no unintended side-effects to the layout.

However, the above kludge modifies an undocumented, underlying 
mechanism.  As such, this would be a case of "just because you can does 
not necessarily mean you should".

As has been suggested, perhaps the best option would be to post-process 
the SVG output from outside LilyPond.


-- Aaron Hill