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+;;; ob-js.el --- org-babel functions for Javascript
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+
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+;; Copyright (C) 2010 Free Software Foundation
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+
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+;; Author: Eric Schulte
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+;; Keywords: literate programming, reproducible research, js
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+;; Homepage: http://orgmode.org
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+;; Version: 0.01
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+
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+;;; License:
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+
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+;; This program is free software; you can redistribute it and/or modify
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+;; it under the terms of the GNU General Public License as published by
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+;; the Free Software Foundation; either version 3, or (at your option)
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+;; any later version.
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+;;
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+;; This program is distributed in the hope that it will be useful,
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+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+;; GNU General Public License for more details.
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+;;
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+;; You should have received a copy of the GNU General Public License
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+;; along with GNU Emacs; see the file COPYING. If not, write to the
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+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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+;; Boston, MA 02110-1301, USA.
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+
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+;;; Commentary:
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+
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+;; Now working with SBCL for both session and external evaluation.
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+;;
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+;; This certainly isn't optimally robust, but it seems to be working
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+;; for the basic use cases.
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+
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+;;; Requirements:
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+
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+;; node.js | http://nodejs.org/
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+
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+;;; Code:
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+(require 'ob)
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+(require 'ob-eval)
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+
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+(defvar org-babel-default-header-args:js '()
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+ "Default header arguments for js code blocks.")
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+
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+(defcustom org-babel-js-cmd "node"
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+ "Name of command used to evaluate js blocks."
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+ :group 'org-babel
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+ :type 'string)
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+
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+(defvar org-babel-js-function-wrapper
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+ "require('sys').print(require('sys').inspect(function(){%s}()));"
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+ "Javascript code to print value of body.")
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+
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+(defun org-babel-expand-body:js (body params &optional processed-params)
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+ "Expand BODY according to PARAMS, return the expanded body."
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+ (let ((vars (nth 1 (or processed-params (org-babel-process-params params)))))
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+ (concat
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+ (mapconcat ;; define any variables
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+ (lambda (pair) (format "var %s=%s;"
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+ (car pair) (org-babel-js-var-to-js (cdr pair))))
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+ vars "\n") "\n" body "\n")))
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+
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+(defun org-babel-execute:js (body params)
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+ "Execute a block of Javascript code with org-babel.
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+This function is called by `org-babel-execute-src-block'"
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+ (let* ((processed-params (org-babel-process-params params))
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+ (session (not (string= (nth 0 processed-params) "none")))
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+ (result-type (nth 3 processed-params))
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+ (full-body (org-babel-expand-body:js body params processed-params)))
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+ (org-babel-js-read
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+ (if session
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+ (error "javascript sessions are not yet supported.")
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+ (let ((script-file (org-babel-temp-file "js-script-")))
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+ (with-temp-file script-file
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+ (insert
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+ ;; return the value or the output
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+ (if (string= result-type "value")
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+ (format org-babel-js-function-wrapper full-body)
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+ full-body)))
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+ (org-babel-eval (format "%s %s" org-babel-js-cmd script-file) ""))))))
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+
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+(defun org-babel-js-read (results)
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+ "Convert RESULTS into an appropriate elisp value.
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+If RESULTS look like a table, then convert them into an
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+Emacs-lisp table, otherwise return the results as a string."
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+ (org-babel-read
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+ (if (and (stringp results) (string-match "^\\[.+\\]$" results))
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+ (org-babel-read
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+ (concat "'"
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+ (replace-regexp-in-string
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+ "\\[" "(" (replace-regexp-in-string
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+ "\\]" ")" (replace-regexp-in-string
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+ ", " " " (replace-regexp-in-string
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+ "'" "\"" results))))))
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+ results)))
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+
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+(defun org-babel-js-var-to-js (var)
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+ "Convert VAR into a js variable.
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+Convert an elisp value into a string of js source code
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+specifying a variable of the same value."
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+ (if (listp var)
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+ (concat "[" (mapconcat #'org-babel-js-var-to-js var ", ") "]")
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+ (format "%S" var)))
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+
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+(defun org-babel-prep-session:js (session params)
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+ "Prepare SESSION according to the header arguments specified in PARAMS."
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+ (error "not yet implemented"))
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+
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+(defun org-babel-js-initiate-session (&optional session)
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+ "If there is not a current inferior-process-buffer in SESSION
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+then create. Return the initialized session."
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+ (error "Javascript sessions are not yet supported."))
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+
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+(provide 'ob-js)
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+
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+;; arch-tag: 84401fb3-b8d9-4bb6-9a90-cbe2d103d494
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+
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+;;; ob-js.el ends here
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Eric Schulte