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+;;; ob-stan.el --- Babel Functions for Stan -*- lexical-binding: t; -*-
+;; Copyright (C) 2015-2016 Free Software Foundation, Inc.
+;; Author: Kyle Meyer
+;; 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 <http://www.gnu.org/licenses/>.
+;; Org-Babel support for evaluating Stan  source code.
+;; Evaluating a Stan block can produce two different results.
+;; 1) Dump the source code contents to a file.
+;; This file can then be used as a variable in other blocks, which
+;; allows interfaces like RStan to use the model.
+;; 2) Compile the contents to a model file.
+;; This provides access to the CmdStan interface. To use this, set
+;; `org-babel-stan-cmdstan-directory' and provide a :file argument
+;; that does not end in ".stan".
+;; For more information and usage examples, visit
+;;  http://mc-stan.org/
+(defcustom org-babel-stan-cmdstan-directory nil
+ "CmdStan source directory.
+'make' will be called from this directory to compile the Stan
+block. When nil, executing Stan blocks dumps the content to a
+plain text file."
+ :group 'org-babel
+ :type 'string)
+ '((:results . "file")))
+(defun org-babel-execute:stan (body params)
+ "Generate Stan file from BODY according to PARAMS.
+A :file header argument must be given. If
+`org-babel-stan-cmdstan-directory' is non-nil and the file name
+does not have a \".stan\" extension, save an intermediate
+\".stan\" file and compile the block to the named file.
+Otherwise, write the Stan code directly to the named file."
+ (let ((file (expand-file-name
+ (or (cdr (assq :file params))
+ (user-error "Set :file argument to execute Stan blocks")))))
+ (if (or (not org-babel-stan-cmdstan-directory)
+ (string-match-p "\\.stan\\'" file))
+ (with-temp-file file (insert body))
+ (with-temp-file (concat file ".stan") (insert body))
+ (let ((default-directory org-babel-stan-cmdstan-directory))
+ (call-process-shell-command (concat "make " file))))
+ nil)) ; Signal that output has been written to file.
+(defun org-babel-prep-session:stan (_session _params)
+ "Return an error because Stan does not support sessions."
+ (user-error "Stan does not support sessions"))
+;;; ob-stan.el ends here