(:name gregorio-mode
       :website "http://christusrex.pl:8080"
       :description "Major derived mode for .gabc (gregorio) files"
       :type github
       :pkgname "cajetanus/gregorio-mode.el"
       :features gregorio-mode
       :post-init (progn
                    (add-to-list 'auto-mode-alist '("\\.gabc$" . gregorio-mode))))