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118 lines
4.0 KiB
EmacsLisp
118 lines
4.0 KiB
EmacsLisp
;;; litorgy-R.el --- litorgy functions for R code evaluation
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;; Copyright (C) 2009 Eric Schulte
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research, R, statistics
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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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(message "executing R source code block...")
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(save-window-excursion
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(let ((vars (litorgy-reference-variables params))
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results)
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(litorgy-R-initiate-R-buffer)
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(litorgy-R-command-to-string body))))
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;; functions for evaluation of R code
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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-R-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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output output-flag)
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(mapconcat
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(lambda (el)
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(if (stringp el)
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(format "%s" el)
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(format "%S" el)))
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(delq nil
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(mapcar
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(lambda (line)
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(unless (string-match "^>" line)
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(and (string-match "\\[[[:digit:]]+\\] *\\(.*\\)$" line)
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(match-string 1 line))))
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;; drop first, because it's the last line of input
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(cdr (split-string raw "[\n\r]")))) "\n")))))
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(defun litorgy-R-table-or-results (results)
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"If the results look like a matrix, then convert them into an
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Emacs-lisp table otherwise return the results as a string."
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;; TODO: these simple assumptions will probably need some tweaking
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(when (string-match "[ \f\t\n\r\v]+" results)
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(concat "(" (mapconcat #'litorgy-R-tale-or-results
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(split-string results) " ") ")"))
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results)
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(provide 'litorgy-R)
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;;; litorgy-R.el ends here
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