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| | ;;; ob-scheme.el --- org-babel functions for Scheme
;; Copyright (C) 2010-2011 Free Software Foundation
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research, scheme
;; 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 working scheme implementation
;; (e.g. guile http://www.gnu.org/software/guile/guile.html)
;;
;; - for session based evaluation cmuscheme.el is required which is
;; included in Emacs
;;; Code:
(require 'ob)
(require 'ob-ref)
(require 'ob-comint)
(require 'ob-eval)
(eval-when-compile (require 'cl))
(declare-function run-scheme "ext:cmuscheme" (cmd))
(defvar org-babel-default-header-args:scheme '()
"Default header arguments for scheme code blocks.")
(defvar org-babel-scheme-eoe "org-babel-scheme-eoe"
"String to indicate that evaluation has completed.")
(defcustom org-babel-scheme-cmd "guile"
"Name of command used to evaluate scheme blocks."
:group 'org-babel
:type 'string)
(defun org-babel-expand-body:scheme (body params)
"Expand BODY according to PARAMS, return the expanded body."
(let ((vars (mapcar #'cdr (org-babel-get-header params :var))))
(if (> (length vars) 0)
(concat "(let ("
(mapconcat
(lambda (var) (format "%S" (print `(,(car var) ',(cdr var)))))
vars "\n ")
")\n" body ")")
body)))
(defvar scheme-program-name)
(defun org-babel-execute:scheme (body params)
"Execute a block of Scheme code with org-babel.
This function is called by `org-babel-execute-src-block'"
(let* ((result-type (cdr (assoc :result-type params)))
(org-babel-scheme-cmd (or (cdr (assoc :scheme params))
org-babel-scheme-cmd))
(full-body (org-babel-expand-body:scheme body params)))
(read
(if (not (string= (cdr (assoc :session params)) "none"))
;; session evaluation
(let ((session (org-babel-prep-session:scheme
(cdr (assoc :session params)) params)))
(org-babel-comint-with-output
(session (format "%S" org-babel-scheme-eoe) t body)
(mapc
(lambda (line)
(insert (org-babel-chomp line)) (comint-send-input nil t))
(list body (format "%S" org-babel-scheme-eoe)))))
;; external evaluation
(let ((script-file (org-babel-temp-file "scheme-script-")))
(with-temp-file script-file
(insert
;; return the value or the output
(if (string= result-type "value")
(format "(display %s)" full-body)
full-body)))
(org-babel-eval
(format "%s %s" org-babel-scheme-cmd
(org-babel-process-file-name script-file)) ""))))))
(defun org-babel-prep-session:scheme (session params)
"Prepare SESSION according to the header arguments specified in PARAMS."
(let* ((session (org-babel-scheme-initiate-session session))
(vars (mapcar #'cdr (org-babel-get-header params :var)))
(var-lines
(mapcar
(lambda (var) (format "%S" (print `(define ,(car var) ',(cdr var)))))
vars)))
(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-scheme-initiate-session (&optional session)
"If there is not a current inferior-process-buffer in SESSION
then create. Return the initialized session."
(require 'cmuscheme)
(unless (string= session "none")
(let ((session-buffer (save-window-excursion
(run-scheme org-babel-scheme-cmd)
(rename-buffer session)
(current-buffer))))
(if (org-babel-comint-buffer-livep session-buffer)
(progn (sit-for .25) session-buffer)
(sit-for .5)
(org-babel-scheme-initiate-session session)))))
(provide 'ob-scheme)
;;; ob-scheme.el ends here
|