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+;;; ob-forth.el --- org-babel functions for Forth
+;; Copyright (C) 2014 Free Software Foundation, Inc.
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research, forth
+;; 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/>.
+;; Requires the gforth forth compiler and `forth-mode' (see below).
+;; Session evaluation requires the gforth forth compiler as well as
+;; `forth-mode' which is distributed with gforth (in gforth.el).
+(declare-function forth-proc "ext:gforth" ())
+(defvar org-babel-default-header-args:forth '((:session . "yes"))
+ "Default header arguments for forth code blocks.")
+(defun org-babel-execute:forth (body params)
+ "Execute a block of Forth code with org-babel.
+This function is called by `org-babel-execute-src-block'"
+ (if (string= "none" (cdr (assoc :session params)))
+ (error "Non-session evaluation not supported for Forth code blocks")
+ (let ((all-results (org-babel-forth-session-execute body params)))
+ (if (member "output" (cdr (assoc :result-params params)))
+ (mapconcat #'identity all-results "\n")
+ (car (last all-results))))))
+(defun org-babel-forth-session-execute (body params)
+ (require 'forth-mode)
+ (let ((proc (forth-proc))
+ (rx " \\(\n:\\|compiled\n\\\|ok\n\\)")
+ (with-current-buffer (process-buffer (forth-proc))
+ (mapcar (lambda (line)
+ (setq result-start (progn (goto-char (process-mark proc))
+ (comint-send-string proc (concat line "\n"))
+ ;; wait for forth to say "ok"
+ (while (not (progn (goto-char result-start)
+ (re-search-forward rx nil t)))
+ (accept-process-output proc 0.01))
+ (let ((case (match-string 1)))
+ ((string= "ok\n" case)
+ ;; Collect intermediate output.
+ (buffer-substring (+ result-start 1 (length line))
+ (match-beginning 0)))
+ ((string= "compiled\n" case))
+ ;; Ignore partial compilation.
+ ((string= "\n:" case)
+ ;; Report errors.
+ (org-babel-eval-error-notify 1
+ (+ (match-beginning 0) 1) (point-max))) nil))))
+ (split-string (org-babel-trim
+ body params))
+ "\n" 'omit-nulls)))))
+;;; ob-forth.el ends here