;;; ob-forth.el --- Babel Functions for Forth -*- lexical-binding: t; -*-
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;; Copyright (C) 2014-2018 Free Software Foundation, Inc.
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research, forth
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;; Homepage: https://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs 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 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs 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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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Requires the gforth forth compiler and `forth-mode' (see below).
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;; https://www.gnu.org/software/gforth/
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;;; Requirements:
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;; Session evaluation requires the gforth forth compiler as well as
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;; `forth-mode' which is distributed with gforth (in gforth.el).
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;;; Code:
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(require 'ob)
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(declare-function forth-proc "ext:gforth" ())
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(declare-function org-trim "org" (s &optional keep-lead))
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(defvar org-babel-default-header-args:forth '((:session . "yes"))
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"Default header arguments for forth code blocks.")
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(defun org-babel-execute:forth (body params)
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"Execute a block of Forth code with org-babel.
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This function is called by `org-babel-execute-src-block'"
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(if (string= "none" (cdr (assq :session params)))
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(error "Non-session evaluation not supported for Forth code blocks")
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(let ((all-results (org-babel-forth-session-execute body params)))
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(if (member "output" (cdr (assq :result-params params)))
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(mapconcat #'identity all-results "\n")
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(car (last all-results))))))
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(defun org-babel-forth-session-execute (body params)
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(require 'forth-mode)
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(let ((proc (forth-proc))
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(rx " \\(\n:\\|compiled\n\\\|ok\n\\)")
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(result-start))
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(with-current-buffer (process-buffer (forth-proc))
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(mapcar (lambda (line)
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(setq result-start (progn (goto-char (process-mark proc))
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(point)))
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(comint-send-string proc (concat line "\n"))
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;; wait for forth to say "ok"
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(while (not (progn (goto-char result-start)
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(re-search-forward rx nil t)))
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(accept-process-output proc 0.01))
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(let ((case (match-string 1)))
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(cond
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((string= "ok\n" case)
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;; Collect intermediate output.
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(buffer-substring (+ result-start 1 (length line))
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(match-beginning 0)))
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((string= "compiled\n" case))
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;; Ignore partial compilation.
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((string= "\n:" case)
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;; Report errors.
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(org-babel-eval-error-notify 1
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(buffer-substring
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(+ (match-beginning 0) 1) (point-max))) nil))))
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(split-string (org-trim
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(org-babel-expand-body:generic body params))
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"\n"
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'omit-nulls)))))
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(provide 'ob-forth)
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;;; ob-forth.el ends here
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