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;;; ob-forth.el --- Babel Functions for Forth -*- lexical-binding: t; -*-
;; Copyright (C) 2014-2018 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Requires the gforth forth compiler and `forth-mode' (see below).
;; https://www.gnu.org/software/gforth/
;;; Requirements:
;; Session evaluation requires the gforth forth compiler as well as
;; `forth-mode' which is distributed with gforth (in gforth.el).
;;; Code:
(require 'ob)
(declare-function forth-proc "ext:gforth" ())
(declare-function org-trim "org" (s &optional keep-lead))
(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 (assq :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 (assq :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\\)")
(result-start))
(with-current-buffer (process-buffer (forth-proc))
(mapcar (lambda (line)
(setq result-start (progn (goto-char (process-mark proc))
(point)))
(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)))
(cond
((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
(buffer-substring
(+ (match-beginning 0) 1) (point-max))) nil))))
(split-string (org-trim
(org-babel-expand-body:generic body params))
"\n"
'omit-nulls)))))
(provide 'ob-forth)
;;; ob-forth.el ends here
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