node-addon-lilypond/output/share/lilypond/current/scm/file-cache.scm

;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
;;;; Copyright (C) 2005--2020 Han-Wen Nienhuys <[email protected]>
;;;;
;;;; LilyPond is free software: you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation, either version 3 of the License, or
;;;; (at your option) any later version.
;;;;
;;;; LilyPond is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;;; GNU General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License
;;;; along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.


(define cache-hash-tab  (make-hash-table 11))
(define-public (cached-file-contents filename)
  (let*
      ((contents (hash-ref cache-hash-tab filename #f)))

    (if (not (string? contents))
        (begin
          (set! contents (ly:gulp-file filename))
          (hash-set! cache-hash-tab filename contents)))
    contents))