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189 lines
8.2 KiB
EmacsLisp
189 lines
8.2 KiB
EmacsLisp
;;; org-babel-python.el --- org-babel functions for python 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
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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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;; Org-Babel support for evaluating python source code.
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;;; Code:
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(require 'org-babel)
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(require 'python)
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(org-babel-add-interpreter "python")
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(add-to-list 'org-babel-tangle-langs '("python" "py" "#!/usr/bin/env python"))
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(defun org-babel-execute:python (body params)
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"Execute a block of Python code with org-babel. This function is
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called by `org-babel-execute-src-block'."
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(message "executing Python source code block")
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(let* ((vars (org-babel-ref-variables params))
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(result-params (split-string (or (cdr (assoc :results params)) "")))
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(result-type (cond ((member "output" result-params) 'output)
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((member "value" result-params) 'value)
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(t 'value)))
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(full-body (concat
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(mapconcat ;; define any variables
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(lambda (pair)
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(format "%s=%s"
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(car pair)
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(org-babel-python-var-to-python (cdr pair))))
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vars "\n") "\n" (org-babel-trim body) "\n")) ;; then the source block body
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(session (org-babel-python-initiate-session (cdr (assoc :session params))))
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(results (org-babel-python-evaluate session full-body result-type)))
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(if (member "scalar" result-params)
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results
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(setq results (case result-type ;; process results based on the result-type
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('output (let ((tmp-file (make-temp-file "org-babel-python")))
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(with-temp-file tmp-file (insert results))
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(org-babel-import-elisp-from-file tmp-file)))
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('value (org-babel-python-table-or-results results))))
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(if (and (member "vector" results) (not (listp results)))
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(list (list results))
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results))))
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(defun org-babel-prep-session:python (session params)
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"Prepare SESSION according to the header arguments specified in PARAMS."
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(let* ((session (org-babel-python-initiate-session session))
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(vars (org-babel-ref-variables params))
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(var-lines (mapcar ;; define any variables
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(lambda (pair)
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(format "%s=%s"
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(car pair)
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(org-babel-python-var-to-python (cdr pair))))
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vars)))
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(org-babel-comint-in-buffer session
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(mapc (lambda (var)
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(move-end-of-line 1) (insert var) (comint-send-input nil t)
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(org-babel-comint-wait-for-output session)) var-lines))))
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;; helper functions
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(defun org-babel-python-var-to-python (var)
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"Convert an elisp var into a string of python source code
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specifying a var of the same value."
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(if (listp var)
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(concat "[" (mapconcat #'org-babel-python-var-to-python var ", ") "]")
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(format "%S" var)))
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(defun org-babel-python-table-or-results (results)
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"If the results look like a table, then convert them into an
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Emacs-lisp table, otherwise return the results as a string."
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(org-babel-read
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(if (string-match "^\\[.+\\]$" results)
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(org-babel-read
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(replace-regexp-in-string
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"\\[" "(" (replace-regexp-in-string
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"\\]" ")" (replace-regexp-in-string
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", " " " (replace-regexp-in-string
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"'" "\"" results)))))
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results)))
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(defvar org-babel-python-buffers '(:default . nil))
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(defun org-babel-python-session-buffer (session)
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(cdr (assoc session org-babel-python-buffers)))
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(defun org-babel-python-initiate-session-by-key (&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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(save-window-excursion
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(let* ((session (if session (intern session) :default))
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(python-buffer (org-babel-python-session-buffer session)))
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(run-python)
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(setq org-babel-python-buffers (cons (cons session python-buffer) (assq-delete-all session org-babel-python-buffers)))
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session)))
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(defun org-babel-python-initiate-session (&optional session)
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(unless (string= session "none")
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(org-babel-python-session-buffer (org-babel-python-initiate-session-by-key session))))
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(defvar org-babel-python-last-value-eval "_"
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"When evaluated by Python this returns the return value of the last statement.")
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(defvar org-babel-python-eoe-indicator "'org_babel_python_eoe'"
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"Used to indicate that evaluation is has completed.")
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(defvar org-babel-python-wrapper-method
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"
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def main():
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%s
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open('%s', 'w').write( str(main()) )")
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(defun org-babel-python-evaluate (buffer body &optional result-type)
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"Pass BODY to the Python process in BUFFER. If RESULT-TYPE equals
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'output then return a list of the outputs of the statements in
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BODY, if RESULT-TYPE equals 'value then return the value of the
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last statement in BODY."
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(if (not session)
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;; external process evaluation
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(save-window-excursion
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(case result-type
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(output
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(with-temp-buffer
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(insert body)
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;; (message "buffer=%s" (buffer-string)) ;; debugging
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(shell-command-on-region (point-min) (point-max) "python" 'replace)
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(buffer-string)))
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(value
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(let ((tmp-file (make-temp-file "python-functional-results")))
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(with-temp-buffer
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(insert (format org-babel-python-wrapper-method
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(let ((lines (split-string (org-remove-indentation (org-babel-trim body)) "[\r\n]")))
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(concat
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(mapconcat
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(lambda (line) (format "\t%s" line))
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(butlast lines) "\n")
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(format "\n\treturn %s" (last lines))))
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tmp-file))
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;; (message "buffer=%s" (buffer-string)) ;; debugging
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(shell-command-on-region (point-min) (point-max) "python"))
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(with-temp-buffer (insert-file-contents tmp-file) (buffer-string))))))
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;; comint session evaluation
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(org-babel-comint-in-buffer buffer
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(let* ((full-body (mapconcat #'org-babel-trim
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(list body org-babel-python-last-value-eval org-babel-python-eoe-indicator) "\n"))
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(raw (org-babel-comint-with-output buffer org-babel-python-eoe-indicator t
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;; for some reason python is fussy, and likes enters after every input
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(mapc (lambda (statement) (insert statement) (comint-send-input nil t))
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(split-string full-body "[\r\n]+"))))
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(results (delete org-babel-python-eoe-indicator
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(cdr (member org-babel-python-eoe-indicator
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(reverse (mapcar #'org-babel-trim raw)))))))
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(setq results (mapcar #'org-babel-python-read-string results))
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(org-babel-trim (case result-type
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(output (mapconcat #'identity (reverse (cdr results)) "\n"))
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(value (car results))
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(t (reverse results))))))))
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(defun org-babel-python-read-string (string)
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"Strip 's from around ruby string"
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(if (string-match "'\\([^\000]+\\)'" string)
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(match-string 1 string)
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string))
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(provide 'org-babel-python)
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;;; org-babel-python.el ends here
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