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;;; ob-msc.el --- Babel Functions for Mscgen -*- lexical-binding: t; -*-
;; Copyright (C) 2010-2019 Free Software Foundation, Inc.
;; Author: Juan Pechiar
;; 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:
;;
;; This software provides EMACS org-babel export support for message
;; sequence charts. The mscgen utility is used for processing the
;; sequence definition, and must therefore be installed in the system.
;;
;; Mscgen is available and documented at
;; http://www.mcternan.me.uk/mscgen/index.html
;;
;; This code is directly inspired by Eric Schulte's ob-dot.el
;;
;; Example:
;;
;; #+begin_src mscgen :file example.png
;; msc {
;; A,B;
;; A -> B [ label = "send message" ];
;; A <- B [ label = "get answer" ];
;; }
;; #+end_src
;;
;; Header for alternative file type:
;;
;; #+begin_src mscgen :file ex2.svg :filetype svg
;; This differs from most standard languages in that
;;
;; 1) there is no such thing as a "session" in mscgen
;; 2) we are generally only going to return results of type "file"
;; 3) we are adding the "file" and "filetype" header arguments
;; 4) there are no variables
;;; Code:
(require 'ob)
(defvar org-babel-default-header-args:mscgen
'((:results . "file") (:exports . "results"))
"Default arguments to use when evaluating a mscgen source block.")
(defun org-babel-execute:mscgen (body params)
"Execute a block of Mscgen code with Babel.
This function is called by `org-babel-execute-src-block'.
Default filetype is png. Modify by setting :filetype parameter to
mscgen supported formats."
(let* ((out-file (or (cdr (assq :file params)) "output.png" ))
(filetype (or (cdr (assq :filetype params)) "png" )))
(unless (cdr (assq :file params))
(error "
ERROR: no output file specified. Add \":file name.png\" to the src header"))
(org-babel-eval (concat "mscgen -T " filetype " -o " out-file) body)
nil)) ;; signal that output has already been written to file
(defun org-babel-prep-session:mscgen (_session _params)
"Raise an error because Mscgen doesn't support sessions."
(error "Mscgen does not support sessions"))
(provide 'ob-mscgen)
;;; ob-msc.el ends here
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