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+;;; ob-asymptote.el --- Babel Functions for Asymptote -*- 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:
+
+;; Org-Babel support for evaluating asymptote source code.
+;;
+;; This differs from most standard languages in that
+;;
+;; 1) there is no such thing as a "session" in asymptote
+;;
+;; 2) we are generally only going to return results of type "file"
+;;
+;; 3) we are adding the "file" and "cmdline" header arguments, if file
+;;    is omitted then the -V option is passed to the asy command for
+;;    interactive viewing
+
+;;; Requirements:
+
+;; - The asymptote program :: http://asymptote.sourceforge.net/
+;;
+;; - asy-mode :: Major mode for editing asymptote files
+
+;;; Code:
+(require 'ob)
+
+(defvar org-babel-tangle-lang-exts)
+(add-to-list 'org-babel-tangle-lang-exts '("asymptote" . "asy"))
+
+(defvar org-babel-default-header-args:asymptote
+  '((:results . "file") (:exports . "results"))
+  "Default arguments when evaluating an Asymptote source block.")
+
+(defun org-babel-execute:asymptote (body params)
+  "Execute a block of Asymptote code.
+This function is called by `org-babel-execute-src-block'."
+  (let* ((out-file (cdr (assq :file params)))
+         (format (or (file-name-extension out-file)
+                     "pdf"))
+         (cmdline (cdr (assq :cmdline params)))
+         (in-file (org-babel-temp-file "asymptote-"))
+         (cmd
+	  (concat "asy "
+		  (if out-file
+		      (concat
+		       "-globalwrite -f " format
+		       " -o " (org-babel-process-file-name out-file))
+		    "-V")
+		  " " cmdline
+		  " " (org-babel-process-file-name in-file))))
+    (with-temp-file in-file
+      (insert (org-babel-expand-body:generic
+	       body params
+	       (org-babel-variable-assignments:asymptote params))))
+    (message cmd) (shell-command cmd)
+    nil)) ;; signal that output has already been written to file
+
+(defun org-babel-prep-session:asymptote (_session _params)
+  "Return an error if the :session header argument is set.
+Asymptote does not support sessions"
+  (error "Asymptote does not support sessions"))
+
+(defun org-babel-variable-assignments:asymptote (params)
+  "Return list of asymptote statements assigning the block's variables."
+  (mapcar #'org-babel-asymptote-var-to-asymptote
+	  (org-babel--get-vars params)))
+
+(defun org-babel-asymptote-var-to-asymptote (pair)
+  "Convert an elisp value into an Asymptote variable.
+The elisp value PAIR is converted into Asymptote code specifying
+a variable of the same value."
+  (let ((var (car pair))
+        (val (let ((v (cdr pair)))
+	       (if (symbolp v) (symbol-name v) v))))
+    (cond
+     ((integerp val)
+      (format "int %S=%S;" var val))
+     ((floatp val)
+      (format "real %S=%S;" var val))
+     ((stringp val)
+      (format "string %S=\"%s\";" var val))
+     ((and (listp val) (not (listp (car val))))
+      (let* ((type (org-babel-asymptote-define-type val))
+	     (fmt (if (eq 'string type) "\"%s\"" "%s"))
+	     (vect (mapconcat (lambda (e) (format fmt e)) val ", ")))
+	(format "%s[] %S={%s};" type var vect)))
+     ((listp val)
+      (let* ((type (org-babel-asymptote-define-type val))
+	     (fmt (if (eq 'string type) "\"%s\"" "%s"))
+             (array (mapconcat (lambda (row)
+				 (concat "{"
+					 (mapconcat (lambda (e) (format fmt e))
+						    row ", ")
+					 "}"))
+			       val ",")))
+        (format "%S[][] %S={%s};" type var array))))))
+
+(defun org-babel-asymptote-define-type (data)
+  "Determine type of DATA.
+
+DATA is a list.  Return type as a symbol.
+
+The type is `string' if any element in DATA is a string.
+Otherwise, it is either `real', if some elements are floats, or
+`int'."
+  (letrec ((type 'int)
+	   (find-type
+	    (lambda (row)
+	      (dolist (e row type)
+		(cond ((listp e) (setq type (funcall find-type e)))
+		      ((stringp e) (throw 'exit 'string))
+		      ((floatp e) (setq type 'real)))))))
+    (catch 'exit (funcall find-type data)) type))
+
+(provide 'ob-asymptote)
+
+
+
+;;; ob-asymptote.el ends here