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+;;; ob-spice.el --- Babel Functions for spice
+;;; -*- coding: utf-8 -*-
+
+;; License: GPL v3, or any later version
+;;
+;; This file 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, or (at your option)
+;; any later version.
+;;
+;; This file 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Org-Babel support for evaluating spice.
+
+;;; Requirements:
+
+;; - ngspice :: http://ngspice.sourceforge.net/
+
+;;; Code:
+
+(require 'ob)
+
+;; (lambda (text) (setq body (concat text "\n" body)))
+(defun ob-spice-vector-search (body vars)
+  "Replace first instance in BODY for all VARS."
+  (mapc (lambda (pair)
+	  (if (string-match (format
+			     "\\$%s\\[\\([0-9]\\)\\]"
+			     (car pair))
+			    body)
+	      (let ((replacement (nth
+				  (string-to-number (match-string 1 body))
+				  (cadr pair))))
+		(setq body(format "%s%s%s"
+				  (substring body 0 (match-beginning
+						     0))
+				  replacement
+				  (substring body (match-end 0)))))))
+	vars)
+  body
+  )
+
+(defun org-babel-expand-body:spice (body params)
+  "Expand BODY according to PARAMS, return the expanded body."
+  (let ((vars (org-babel--get-vars params))
+	(prologue (cdr (assq :prologue params)))
+	(epilogue (cdr (assq :epilogue params)))
+	(file (cdr (assq :file params)))
+	(old-body ""))
+    ;; replace vector variables preceded by '$' and followed by the
+    ;; index in square brackets starting at 0. Matches without
+    ;; preceding or succeeding spaces.
+    (while (not (string= old-body body))
+      (setq old-body body)
+      (setq body (ob-spice-vector-search body vars))
+      )
+    ;; replace any variable names preceded by '$' with the actual
+    ;; value of the variable. Matches only with succeeding space or
+    ;; end of line to prevent namespace limitations.
+    (mapc (lambda (pair)
+	    (setq body (replace-regexp-in-string
+			(format "\\$%s\\( \\)\\|\\$%s$" (car pair)
+				(car pair))
+			(format "%s\1" (cdr pair))
+			body)))
+	  vars)
+    ;; TODO :file stuff ....
+    
+    (when prologue (setq body (concat prologue "\n" body)))
+    (when epilogue (setq body (concat body "\n" epilogue)))
+    body))
+
+(defun org-babel-execute:spice (body params)
+  "Execute a block of Spice code with Babel.
+This function is called by `org-babel-execute-src-block'."
+  (let ((body (org-babel-expand-body:spice body params))
+	(gnuplot (cdr (assq :gnuplot params))))
+
+    ;; TODO deal with temporary files
+
+    (org-babel-eval "ngspice -b " body)
+
+
+    ;; TODO read outputs from files
+    
+    ;; TODO gnuplot options
+    (if (string= "yes" gnuplot)
+	nil ;return content(!) of gnuplot.plt for :post processing or
+					;nowebbing spice into gnuplot
+      nil ;return normal spice output
+      )
+    ))
+
+
+(provide 'ob-spice)
+;;; ob-spice.el ends here