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;;; ob-sass.el --- Babel Functions for the Sass CSS generation language -*- lexical-binding: t; -*-
;; Copyright (C) 2009-2017 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://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 http://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 :: http://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
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