2009-02-24 00:07:07 +00:00
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;;; litorgy-R.el --- litorgy functions for R code evaluation
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;; Copyright (C) 2009 Eric Schulte, Dan Davison, Austin F. Frank
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;; Author: Eric Schulte, Dan Davison, Austin F. Frank
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;; Keywords: literate programming, reproducible research
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;; Homepage: http://orgmode.org
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;; Version: 0.01
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;;; License:
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;; This program 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, or (at your option)
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;; any later version.
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;;
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;; This program 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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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;; Litorgy support for evaluating R code
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;;; Code:
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(require 'litorgy)
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(litorgy-add-interpreter "R")
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(defun litorgy-execute:R (body params)
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"Execute a block of R code with litorgy. This function is
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called by `litorgy-execute-src-block'."
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(let (results)
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(message "executing R code block...")
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(litorgy-initiate-R-buffer)
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(mapc (lambda (line) (litorgy-R-input-command line)) (butlast (split-string body "[\r\n]")))
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2009-02-24 00:08:02 +00:00
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(litorgy-R-last-output)))
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2009-02-24 00:07:07 +00:00
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;; Maybe the following be replaced with a method using `ess-execute',
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;; I went with the following functions because I wrote them and they
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;; are what I know
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;;
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;; (not the best reasons for making design decisions)
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(defvar litorgy-R-buffer nil
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"Holds the buffer for the current R process")
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(defun litorgy-initiate-R-buffer ()
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"If there is not a current R process then create one."
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(unless (and (buffer-live-p litorgy-R-buffer) (get-buffer litorgy-R-buffer))
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(save-excursion
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(R)
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(setf litorgy-R-buffer (current-buffer))
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(litorgy-R-wait-for-output)
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(litorgy-R-input-command ""))))
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(defun litorgy-R-command-to-string (command)
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"Send a command to R, and return the results as a string."
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(litorgy-R-input-command command)
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(litorgy-R-last-output))
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(defun litorgy-R-input-command (command)
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"Pass COMMAND to the R process running in `litorgy-R-buffer'."
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(save-excursion
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(save-match-data
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(set-buffer litorgy-R-buffer)
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(goto-char (process-mark (get-buffer-process (current-buffer))))
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(insert command)
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(comint-send-input)
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(litorgy-R-wait-for-output))))
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(defun litorgy-R-wait-for-output ()
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"Wait until output arrives"
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(save-excursion
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(save-match-data
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(set-buffer litorgy-R-buffer)
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(while (progn
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(goto-char comint-last-input-end)
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(not (re-search-forward comint-prompt-regexp nil t)))
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(accept-process-output (get-buffer-process (current-buffer)))))))
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(defun litorgy-R-last-output ()
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"Return the last R output as a string"
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(save-excursion
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(save-match-data
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(set-buffer litorgy-R-buffer)
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(goto-char (process-mark (get-buffer-process (current-buffer))))
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(forward-line 0)
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(let ((raw (buffer-substring comint-last-input-end (- (point) 1))))
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(if (string-match "\n" raw)
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raw
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(and (string-match "\\[[[:digit:]+]\\] *\\(.*\\)$" raw)
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(message raw)
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(message (match-string 1 raw))
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(match-string 1 raw)))))))
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(provide 'litorgy-R)
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;;; litorgy-R.el ends here
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