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137 lines
4.6 KiB
EmacsLisp
137 lines
4.6 KiB
EmacsLisp
;;; ob-scheme.el --- org-babel functions for Scheme
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;; Copyright (C) 2010-2012 Free Software Foundation
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research, scheme
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;; Homepage: http://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 <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Now working with SBCL for both session and external evaluation.
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;;
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;; This certainly isn't optimally robust, but it seems to be working
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;; for the basic use cases.
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;;; Requirements:
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;; - a working scheme implementation
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;; (e.g. guile http://www.gnu.org/software/guile/guile.html)
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;;
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;; - for session based evaluation cmuscheme.el is required which is
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;; included in Emacs
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;;; Code:
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(require 'ob)
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(require 'ob-ref)
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(require 'ob-comint)
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(require 'ob-eval)
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(eval-when-compile (require 'cl))
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(declare-function run-scheme "ext:cmuscheme" (cmd))
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(defvar org-babel-default-header-args:scheme '()
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"Default header arguments for scheme code blocks.")
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(defvar org-babel-scheme-eoe "org-babel-scheme-eoe"
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"String to indicate that evaluation has completed.")
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(defcustom org-babel-scheme-cmd "guile"
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"Name of command used to evaluate scheme blocks."
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:group 'org-babel
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:type 'string)
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(defun org-babel-expand-body:scheme (body params)
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"Expand BODY according to PARAMS, return the expanded body."
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(let ((vars (mapcar #'cdr (org-babel-get-header params :var))))
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(if (> (length vars) 0)
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(concat "(let ("
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(mapconcat
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(lambda (var) (format "%S" (print `(,(car var) ',(cdr var)))))
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vars "\n ")
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")\n" body ")")
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body)))
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(defvar scheme-program-name)
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(defun org-babel-execute:scheme (body params)
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"Execute a block of Scheme code with org-babel.
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This function is called by `org-babel-execute-src-block'"
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(let* ((result-type (cdr (assoc :result-type params)))
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(org-babel-scheme-cmd (or (cdr (assoc :scheme params))
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org-babel-scheme-cmd))
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(full-body (org-babel-expand-body:scheme body params)))
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(read
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(if (not (string= (cdr (assoc :session params)) "none"))
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;; session evaluation
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(let ((session (org-babel-prep-session:scheme
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(cdr (assoc :session params)) params)))
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(org-babel-comint-with-output
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(session (format "%S" org-babel-scheme-eoe) t body)
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(mapc
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(lambda (line)
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(insert (org-babel-chomp line)) (comint-send-input nil t))
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(list body (format "%S" org-babel-scheme-eoe)))))
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;; external evaluation
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(let ((script-file (org-babel-temp-file "scheme-script-")))
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(with-temp-file script-file
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(insert
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;; return the value or the output
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(if (string= result-type "value")
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(format "(display %s)" full-body)
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full-body)))
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(org-babel-eval
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(format "%s %s" org-babel-scheme-cmd
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(org-babel-process-file-name script-file)) ""))))))
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(defun org-babel-prep-session:scheme (session params)
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"Prepare SESSION according to the header arguments specified in PARAMS."
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(let* ((session (org-babel-scheme-initiate-session session))
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(vars (mapcar #'cdr (org-babel-get-header params :var)))
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(var-lines
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(mapcar
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(lambda (var) (format "%S" (print `(define ,(car var) ',(cdr var)))))
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vars)))
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(when session
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(org-babel-comint-in-buffer session
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(sit-for .5) (goto-char (point-max))
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(mapc (lambda (var)
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(insert var) (comint-send-input nil t)
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(org-babel-comint-wait-for-output session)
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(sit-for .1) (goto-char (point-max))) var-lines)))
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session))
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(defun org-babel-scheme-initiate-session (&optional session)
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"If there is not a current inferior-process-buffer in SESSION
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then create. Return the initialized session."
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(require 'cmuscheme)
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(unless (string= session "none")
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(let ((session-buffer (save-window-excursion
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(run-scheme org-babel-scheme-cmd)
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(rename-buffer session)
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(current-buffer))))
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(if (org-babel-comint-buffer-livep session-buffer)
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(progn (sit-for .25) session-buffer)
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(sit-for .5)
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(org-babel-scheme-initiate-session session)))))
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(provide 'ob-scheme)
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;;; ob-scheme.el ends here
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