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;;; ob-js.el --- org-babel functions for Javascript
;; Copyright (C) 2010-2015 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research, js
;; 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/>.
;;; Commentary:
;; Now working with SBCL for both session and external evaluation.
;;
;; This certainly isn't optimally robust, but it seems to be working
;; for the basic use cases.
;;; Requirements:
;; - a non-browser javascript engine such as node.js http://nodejs.org/
;; or mozrepl http://wiki.github.com/bard/mozrepl/
;;
;; - for session based evaluation mozrepl and moz.el are required see
;; http://wiki.github.com/bard/mozrepl/emacs-integration for
;; configuration instructions
;;; Code:
(require 'ob)
(eval-when-compile (require 'cl))
(declare-function run-mozilla "ext:moz" (arg))
(defvar org-babel-default-header-args:js '()
"Default header arguments for js code blocks.")
(defvar org-babel-js-eoe "org-babel-js-eoe"
"String to indicate that evaluation has completed.")
(defcustom org-babel-js-cmd "node"
"Name of command used to evaluate js blocks."
:group 'org-babel
:version "24.1"
:type 'string)
(defvar org-babel-js-function-wrapper
"require('sys').print(require('sys').inspect(function(){%s}()));"
"Javascript code to print value of body.")
(defun org-babel-execute:js (body params)
"Execute a block of Javascript code with org-babel.
This function is called by `org-babel-execute-src-block'"
(let* ((org-babel-js-cmd (or (cdr (assoc :cmd params)) org-babel-js-cmd))
(result-type (cdr (assoc :result-type params)))
(full-body (org-babel-expand-body:generic
body params (org-babel-variable-assignments:js params)))
(result (if (not (string= (cdr (assoc :session params)) "none"))
;; session evaluation
(let ((session (org-babel-prep-session:js
(cdr (assoc :session params)) params)))
(nth 1
(org-babel-comint-with-output
(session (format "%S" org-babel-js-eoe) t body)
(mapc
(lambda (line)
(insert (org-babel-chomp line))
(comint-send-input nil t))
(list body (format "%S" org-babel-js-eoe))))))
;; external evaluation
(let ((script-file (org-babel-temp-file "js-script-")))
(with-temp-file script-file
(insert
;; return the value or the output
(if (string= result-type "value")
(format org-babel-js-function-wrapper full-body)
full-body)))
(org-babel-eval
(format "%s %s" org-babel-js-cmd
(org-babel-process-file-name script-file)) "")))))
(org-babel-result-cond (cdr (assoc :result-params params))
result (org-babel-js-read result))))
(defun org-babel-js-read (results)
"Convert RESULTS into an appropriate elisp value.
If RESULTS look like a table, then convert them into an
Emacs-lisp table, otherwise return the results as a string."
(org-babel-read
(if (and (stringp results) (string-match "^\\[.+\\]$" results))
(org-babel-read
(concat "'"
(replace-regexp-in-string
"\\[" "(" (replace-regexp-in-string
"\\]" ")" (replace-regexp-in-string
", " " " (replace-regexp-in-string
"'" "\"" results))))))
results)))
(defun org-babel-js-var-to-js (var)
"Convert VAR into a js variable.
Convert an elisp value into a string of js source code
specifying a variable of the same value."
(if (listp var)
(concat "[" (mapconcat #'org-babel-js-var-to-js var ", ") "]")
(format "%S" var)))
(defun org-babel-prep-session:js (session params)
"Prepare SESSION according to the header arguments specified in PARAMS."
(let* ((session (org-babel-js-initiate-session session))
(var-lines (org-babel-variable-assignments:js params)))
(when session
(org-babel-comint-in-buffer session
(sit-for .5) (goto-char (point-max))
(mapc (lambda (var)
(insert var) (comint-send-input nil t)
(org-babel-comint-wait-for-output session)
(sit-for .1) (goto-char (point-max))) var-lines)))
session))
(defun org-babel-variable-assignments:js (params)
"Return list of Javascript statements assigning the block's variables."
(mapcar
(lambda (pair) (format "var %s=%s;"
(car pair) (org-babel-js-var-to-js (cdr pair))))
(mapcar #'cdr (org-babel-get-header params :var))))
(defun org-babel-js-initiate-session (&optional session)
"If there is not a current inferior-process-buffer in SESSION
then create. Return the initialized session."
(unless (string= session "none")
(cond
((string= "mozrepl" org-babel-js-cmd)
(require 'moz)
(let ((session-buffer (save-window-excursion
(run-mozilla nil)
(rename-buffer session)
(current-buffer))))
(if (org-babel-comint-buffer-livep session-buffer)
(progn (sit-for .25) session-buffer)
(sit-for .5)
(org-babel-js-initiate-session session))))
((string= "node" org-babel-js-cmd )
(error "Session evaluation with node.js is not supported"))
(t
(error "Sessions are only supported with mozrepl add \":cmd mozrepl\"")))))
(provide 'ob-js)
;;; ob-js.el ends here
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