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+;;; ob-shen.el --- Babel Functions for Shen          -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2010-2017 Free Software Foundation, Inc.
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research, shen
+;; 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:
+
+;; Currently this only works using session evaluation as there is no
+;; defined method for executing shen code outside of a session.
+
+;;; Requirements:
+
+;; - shen-mode and inf-shen will soon be available through the GNU
+;;   elpa, however in the interim they are available at
+;;   https://github.com/eschulte/shen-mode
+
+;;; Code:
+(require 'ob)
+
+(declare-function shen-eval-defun "ext:inf-shen" (&optional and-go))
+(declare-function org-babel-ruby-var-to-ruby "ob-ruby" (var))
+
+(defvar org-babel-default-header-args:shen '()
+  "Default header arguments for shen code blocks.")
+
+(defun org-babel-expand-body:shen (body params)
+  "Expand BODY according to PARAMS, return the expanded body."
+  (let ((vars (org-babel--get-vars params)))
+    (if (> (length vars) 0)
+        (concat "(let "
+                (mapconcat (lambda (var)
+			     (format "%s %s" (car var)
+				     (org-babel-shen-var-to-shen (cdr var))))
+			   vars " ")
+		body ")")
+      body)))
+
+(defun org-babel-shen-var-to-shen (var)
+  "Convert VAR into a shen variable."
+  (if (listp var)
+      (concat "[" (mapconcat #'org-babel-ruby-var-to-ruby var " ") "]")
+    (format "%S" var)))
+
+(defun org-babel-execute:shen (body params)
+  "Execute a block of Shen code with org-babel.
+This function is called by `org-babel-execute-src-block'"
+  (require 'inf-shen)
+  (let* ((result-params (cdr (assq :result-params params)))
+         (full-body (org-babel-expand-body:shen body params)))
+    (let ((results
+           (with-temp-buffer
+             (insert full-body)
+             (call-interactively #'shen-eval-defun))))
+      (org-babel-result-cond result-params
+        results
+        (condition-case nil (org-babel-script-escape results)
+          (error results))))))
+
+(provide 'ob-shen)
+;;; ob-shen.el ends here