lisp/ob-sass.el

   1 ;;; ob-sass.el --- Babel Functions for the Sass CSS generation language -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2009-2019 Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: https://orgmode.org
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; For more information on sass see http://sass-lang.com/
  27 ;;
  28 ;; This accepts a 'file' header argument which is the target of the
  29 ;; compiled sass.  The default output type for sass evaluation is
  30 ;; either file (if a 'file' header argument was given) or scalar if no
  31 ;; such header argument was supplied.
  32 ;;
  33 ;; A 'cmdline' header argument can be supplied to pass arguments to
  34 ;; the sass command line.
  35
  36 ;;; Requirements:
  37
  38 ;; - sass-mode :: http://github.com/nex3/haml/blob/master/extra/sass-mode.el
  39
  40 ;;; Code:
  41 (require 'ob)
  42
  43 (defvar org-babel-default-header-args:sass '())
  44
  45 (defun org-babel-execute:sass (body params)
  46   "Execute a block of Sass code with Babel.
  47 This function is called by `org-babel-execute-src-block'."
  48   (let* ((file (cdr (assq :file params)))
  49          (out-file (or file (org-babel-temp-file "sass-out-")))
  50          (cmdline (cdr (assq :cmdline params)))
  51          (in-file (org-babel-temp-file "sass-in-"))
  52          (cmd (concat "sass " (or cmdline "")
  53                       " " (org-babel-process-file-name in-file)
  54                       " " (org-babel-process-file-name out-file))))
  55     (with-temp-file in-file
  56       (insert (org-babel-expand-body:generic body params)))
  57     (org-babel-eval cmd "")
  58     (if file
  59         nil ;; signal that output has already been written to file
  60       (with-temp-buffer (insert-file-contents out-file) (buffer-string)))))
  61
  62 (defun org-babel-prep-session:sass (_session _params)
  63   "Raise an error because sass does not support sessions."
  64   (error "Sass does not support sessions"))
  65
  66 (provide 'ob-sass)
  67
  68
  69
  70 ;;; ob-sass.el ends here