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+;;; ob-sass.el --- Babel Functions for the Sass CSS generation language -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2009-2021 Free Software Foundation, Inc.
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research
+;; Homepage: https://orgmode.org
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; For more information on sass see https://sass-lang.com/
+;;
+;; This accepts a 'file' header argument which is the target of the
+;; compiled sass.  The default output type for sass evaluation is
+;; either file (if a 'file' header argument was given) or scalar if no
+;; such header argument was supplied.
+;;
+;; A 'cmdline' header argument can be supplied to pass arguments to
+;; the sass command line.
+
+;;; Requirements:
+
+;; - sass-mode :: https://github.com/nex3/haml/blob/master/extra/sass-mode.el
+
+;;; Code:
+(require 'ob)
+
+(defvar org-babel-default-header-args:sass '())
+
+(defun org-babel-execute:sass (body params)
+  "Execute a block of Sass code with Babel.
+This function is called by `org-babel-execute-src-block'."
+  (let* ((file (cdr (assq :file params)))
+         (out-file (or file (org-babel-temp-file "sass-out-")))
+         (cmdline (cdr (assq :cmdline params)))
+         (in-file (org-babel-temp-file "sass-in-"))
+         (cmd (concat "sass " (or cmdline "")
+		      " " (org-babel-process-file-name in-file)
+		      " " (org-babel-process-file-name out-file))))
+    (with-temp-file in-file
+      (insert (org-babel-expand-body:generic body params)))
+    (org-babel-eval cmd "")
+    (if file
+	nil ;; signal that output has already been written to file
+      (with-temp-buffer (insert-file-contents out-file) (buffer-string)))))
+
+(defun org-babel-prep-session:sass (_session _params)
+  "Raise an error because sass does not support sessions."
+  (error "Sass does not support sessions"))
+
+(provide 'ob-sass)
+
+;;; ob-sass.el ends here