If I understand you correctly, you want to add a new articulation script
(rather than patching the code for dynamic marks). That's quite easy, if
you are a little bit familiar with metafont. For that purpose, you should
* add the articulation sign to the feta font; see file mf/feta-schrift.mf;
I guess the direction (up/down) does not matter for espressivo marks,
hence a single character "espressivo" should suffice; you may want to
have a look at the sforzatoaccent as an example of a similar character
that is already in the font;
* tell lily about your articulation sign by adding it to the file scm/script.scm (twice the same character "espressivo" for both directions, up and down);
* add a handy shortcut to the file ly/script-init.ly
* for testing, add it to input/test/script-chart.ly
* for documentation, add it to the Articulations section (currently section 5.7.8) of the user manual; see Documentation/user/notation.itely.
And, whenever changing feta-schrift, don't forget to clean the font such that all font files will be rebuilt; otherwise, you will not see any change, or the font will be messed up (as inserting a new character changes the numbers in the font tables).
Okay, following the above i would like to propose a first attempt of a patch.
Feel free to rant about my mistakes, but please be reminded that i am just a pianist trying his best. Don't shoot!
Arno -- http://www.arnowaschk.de
lily-041126.patch
Description: Binary data
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