lisp/ob-python.el

   1 ;;; ob-python.el --- org-babel functions for python evaluation
   2
   3 ;; Copyright (C) 2009-2014 Free Software Foundation, Inc.
   4
   5 ;; Authors: Eric Schulte
   6 ;;       Dan Davison
   7 ;; Keywords: literate programming, reproducible research
   8 ;; Homepage: http://orgmode.org
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; Org-Babel support for evaluating python source code.
  28
  29 ;;; Code:
  30 (require 'ob)
  31 (eval-when-compile (require 'cl))
  32
  33 (declare-function org-remove-indentation "org" )
  34 (declare-function py-shell "ext:python-mode" (&optional argprompt))
  35 (declare-function py-toggle-shells "ext:python-mode" (arg))
  36 (declare-function run-python "ext:python" (cmd &optional dedicated show))
  37
  38 (defvar org-babel-tangle-lang-exts)
  39 (add-to-list 'org-babel-tangle-lang-exts '("python" . "py"))
  40
  41 (defvar org-babel-default-header-args:python '())
  42
  43 (defcustom org-babel-python-command "python"
  44   "Name of the command for executing Python code."
  45   :version "24.4"
  46   :package-version '(Org . "8.0")
  47   :group 'org-babel
  48   :type 'string)
  49
  50 (defcustom org-babel-python-mode
  51   (if (or (featurep 'xemacs) (featurep 'python-mode)) 'python-mode 'python)
  52   "Preferred python mode for use in running python interactively.
  53 This will typically be either 'python or 'python-mode."
  54   :group 'org-babel
  55   :version "24.4"
  56   :package-version '(Org . "8.0")
  57   :type 'symbol)
  58
  59 (defcustom org-babel-python-hline-to "None"
  60   "Replace hlines in incoming tables with this when translating to python."
  61   :group 'org-babel
  62   :version "24.4"
  63   :package-version '(Org . "8.0")
  64   :type 'string)
  65
  66 (defcustom org-babel-python-None-to 'hline
  67   "Replace 'None' in python tables with this before returning."
  68   :group 'org-babel
  69   :version "24.4"
  70   :package-version '(Org . "8.0")
  71   :type 'symbol)
  72
  73 (defun org-babel-execute:python (body params)
  74   "Execute a block of Python code with Babel.
  75 This function is called by `org-babel-execute-src-block'."
  76   (let* ((session (org-babel-python-initiate-session
  77                    (cdr (assoc :session params))))
  78          (result-params (cdr (assoc :result-params params)))
  79          (result-type (cdr (assoc :result-type params)))
  80          (return-val (when (and (eq result-type 'value) (not session))
  81                        (cdr (assoc :return params))))
  82          (preamble (cdr (assoc :preamble params)))
  83          (full-body
  84           (org-babel-expand-body:generic
  85            (concat body (if return-val (format "\nreturn %s" return-val) ""))
  86            params (org-babel-variable-assignments:python params)))
  87          (result (org-babel-python-evaluate
  88                   session full-body result-type result-params preamble)))
  89     (org-babel-reassemble-table
  90      result
  91      (org-babel-pick-name (cdr (assoc :colname-names params))
  92                           (cdr (assoc :colnames params)))
  93      (org-babel-pick-name (cdr (assoc :rowname-names params))
  94                           (cdr (assoc :rownames params))))))
  95
  96 (defun org-babel-prep-session:python (session params)
  97   "Prepare SESSION according to the header arguments in PARAMS.
  98 VARS contains resolved variable references"
  99   (let* ((session (org-babel-python-initiate-session session))
 100          (var-lines
 101           (org-babel-variable-assignments:python params)))
 102     (org-babel-comint-in-buffer session
 103       (mapc (lambda (var)
 104               (end-of-line 1) (insert var) (comint-send-input)
 105               (org-babel-comint-wait-for-output session)) var-lines))
 106     session))
 107
 108 (defun org-babel-load-session:python (session body params)
 109   "Load BODY into SESSION."
 110   (save-window-excursion
 111     (let ((buffer (org-babel-prep-session:python session params)))
 112       (with-current-buffer buffer
 113         (goto-char (process-mark (get-buffer-process (current-buffer))))
 114         (insert (org-babel-chomp body)))
 115       buffer)))
 116
 117 ;; helper functions
 118
 119 (defun org-babel-variable-assignments:python (params)
 120   "Return a list of Python statements assigning the block's variables."
 121   (mapcar
 122    (lambda (pair)
 123      (format "%s=%s"
 124              (car pair)
 125              (org-babel-python-var-to-python (cdr pair))))
 126    (mapcar #'cdr (org-babel-get-header params :var))))
 127
 128 (defun org-babel-python-var-to-python (var)
 129   "Convert an elisp value to a python variable.
 130 Convert an elisp value, VAR, into a string of python source code
 131 specifying a variable of the same value."
 132   (if (listp var)
 133       (concat "[" (mapconcat #'org-babel-python-var-to-python var ", ") "]")
 134     (if (equal var 'hline)
 135         org-babel-python-hline-to
 136       (format
 137        (if (and (stringp var) (string-match "[\n\r]" var)) "\"\"%S\"\"" "%S")
 138        (if (stringp var) (substring-no-properties var) var)))))
 139
 140 (defun org-babel-python-table-or-string (results)
 141   "Convert RESULTS into an appropriate elisp value.
 142 If the results look like a list or tuple, then convert them into an
 143 Emacs-lisp table, otherwise return the results as a string."
 144   (let ((res (org-babel-script-escape results)))
 145     (if (listp res)
 146         (mapcar (lambda (el) (if (equal el 'None)
 147                             org-babel-python-None-to el))
 148                 res)
 149       res)))
 150
 151 (defvar org-babel-python-buffers '((:default . "*Python*")))
 152
 153 (defun org-babel-python-session-buffer (session)
 154   "Return the buffer associated with SESSION."
 155   (cdr (assoc session org-babel-python-buffers)))
 156
 157 (defun org-babel-python-with-earmuffs (session)
 158   (let ((name (if (stringp session) session (format "%s" session))))
 159     (if (and (string= "*" (substring name 0 1))
 160              (string= "*" (substring name (- (length name) 1))))
 161         name
 162       (format "*%s*" name))))
 163
 164 (defun org-babel-python-without-earmuffs (session)
 165   (let ((name (if (stringp session) session (format "%s" session))))
 166     (if (and (string= "*" (substring name 0 1))
 167              (string= "*" (substring name (- (length name) 1))))
 168         (substring name 1 (- (length name) 1))
 169       name)))
 170
 171 (defvar py-default-interpreter)
 172 (defvar py-which-bufname)
 173 (defvar python-shell-buffer-name)
 174 (defun org-babel-python-initiate-session-by-key (&optional session)
 175   "Initiate a python session.
 176 If there is not a current inferior-process-buffer in SESSION
 177 then create.  Return the initialized session."
 178   (require org-babel-python-mode)
 179   (save-window-excursion
 180     (let* ((session (if session (intern session) :default))
 181            (python-buffer (org-babel-python-session-buffer session))
 182            (cmd (if (member system-type '(cygwin windows-nt ms-dos))
 183                     (concat org-babel-python-command " -i")
 184                   org-babel-python-command)))
 185       (cond
 186        ((and (eq 'python org-babel-python-mode)
 187              (fboundp 'run-python)) ; python.el
 188         (if (not (version< "24.1" emacs-version))
 189             (run-python cmd)
 190           (unless python-buffer
 191             (setq python-buffer (org-babel-python-with-earmuffs session)))
 192           (let ((python-shell-buffer-name
 193                  (org-babel-python-without-earmuffs python-buffer)))
 194             (run-python cmd))))
 195        ((and (eq 'python-mode org-babel-python-mode)
 196              (fboundp 'py-shell)) ; python-mode.el
 197         ;; Make sure that py-which-bufname is initialized, as otherwise
 198         ;; it will be overwritten the first time a Python buffer is
 199         ;; created.
 200         (py-toggle-shells py-default-interpreter)
 201         ;; `py-shell' creates a buffer whose name is the value of
 202         ;; `py-which-bufname' with '*'s at the beginning and end
 203         (let* ((bufname (if (and python-buffer (buffer-live-p python-buffer))
 204                             (replace-regexp-in-string ;; zap surrounding *
 205                              "^\\*\\([^*]+\\)\\*$" "\\1" python-buffer)
 206                           (concat "Python-" (symbol-name session))))
 207                (py-which-bufname bufname))
 208           (py-shell)
 209           (setq python-buffer (org-babel-python-with-earmuffs bufname))))
 210        (t
 211         (error "No function available for running an inferior Python")))
 212       (setq org-babel-python-buffers
 213             (cons (cons session python-buffer)
 214                   (assq-delete-all session org-babel-python-buffers)))
 215       session)))
 216
 217 (defun org-babel-python-initiate-session (&optional session params)
 218   "Create a session named SESSION according to PARAMS."
 219   (unless (string= session "none")
 220     (org-babel-python-session-buffer
 221      (org-babel-python-initiate-session-by-key session))))
 222
 223 (defvar org-babel-python-eoe-indicator "'org_babel_python_eoe'"
 224   "A string to indicate that evaluation has completed.")
 225 (defvar org-babel-python-wrapper-method
 226   "
 227 def main():
 228 %s
 229
 230 open('%s', 'w').write( str(main()) )")
 231 (defvar org-babel-python-pp-wrapper-method
 232   "
 233 import pprint
 234 def main():
 235 %s
 236
 237 open('%s', 'w').write( pprint.pformat(main()) )")
 238
 239 (defun org-babel-python-evaluate
 240   (session body &optional result-type result-params preamble)
 241   "Evaluate BODY as Python code."
 242   (if session
 243       (org-babel-python-evaluate-session
 244        session body result-type result-params)
 245     (org-babel-python-evaluate-external-process
 246      body result-type result-params preamble)))
 247
 248 (defun org-babel-python-evaluate-external-process
 249   (body &optional result-type result-params preamble)
 250   "Evaluate BODY in external python process.
 251 If RESULT-TYPE equals 'output then return standard output as a
 252 string.  If RESULT-TYPE equals 'value then return the value of the
 253 last statement in BODY, as elisp."
 254   (let ((raw
 255          (case result-type
 256            (output (org-babel-eval org-babel-python-command
 257                                    (concat (if preamble (concat preamble "\n"))
 258                                            body)))
 259            (value (let ((tmp-file (org-babel-temp-file "python-")))
 260                     (org-babel-eval
 261                      org-babel-python-command
 262                      (concat
 263                       (if preamble (concat preamble "\n") "")
 264                       (format
 265                        (if (member "pp" result-params)
 266                            org-babel-python-pp-wrapper-method
 267                          org-babel-python-wrapper-method)
 268                        (mapconcat
 269                         (lambda (line) (format "\t%s" line))
 270                         (split-string
 271                          (org-remove-indentation
 272                           (org-babel-trim body))
 273                          "[\r\n]") "\n")
 274                        (org-babel-process-file-name tmp-file 'noquote))))
 275                     (org-babel-eval-read-file tmp-file))))))
 276     (org-babel-result-cond result-params
 277       raw
 278       (org-babel-python-table-or-string (org-babel-trim raw)))))
 279
 280 (defun org-babel-python-evaluate-session
 281     (session body &optional result-type result-params)
 282   "Pass BODY to the Python process in SESSION.
 283 If RESULT-TYPE equals 'output then return standard output as a
 284 string.  If RESULT-TYPE equals 'value then return the value of the
 285 last statement in BODY, as elisp."
 286   (let* ((send-wait (lambda () (comint-send-input nil t) (sleep-for 0 5)))
 287          (dump-last-value
 288           (lambda
 289             (tmp-file pp)
 290             (mapc
 291              (lambda (statement) (insert statement) (funcall send-wait))
 292              (if pp
 293                  (list
 294                   "import pprint"
 295                   (format "open('%s', 'w').write(pprint.pformat(_))"
 296                           (org-babel-process-file-name tmp-file 'noquote)))
 297                (list (format "open('%s', 'w').write(str(_))"
 298                              (org-babel-process-file-name tmp-file
 299                                                           'noquote)))))))
 300          (input-body (lambda (body)
 301                        (mapc (lambda (line) (insert line) (funcall send-wait))
 302                              (split-string body "[\r\n]"))
 303                        (funcall send-wait)))
 304          (results
 305           (case result-type
 306             (output
 307              (mapconcat
 308               #'org-babel-trim
 309               (butlast
 310                (org-babel-comint-with-output
 311                    (session org-babel-python-eoe-indicator t body)
 312                  (funcall input-body body)
 313                  (funcall send-wait) (funcall send-wait)
 314                  (insert org-babel-python-eoe-indicator)
 315                  (funcall send-wait))
 316                2) "\n"))
 317             (value
 318              (let ((tmp-file (org-babel-temp-file "python-")))
 319                (org-babel-comint-with-output
 320                    (session org-babel-python-eoe-indicator nil body)
 321                  (let ((comint-process-echoes nil))
 322                    (funcall input-body body)
 323                    (funcall dump-last-value tmp-file
 324                             (member "pp" result-params))
 325                    (funcall send-wait) (funcall send-wait)
 326                    (insert org-babel-python-eoe-indicator)
 327                    (funcall send-wait)))
 328                (org-babel-eval-read-file tmp-file))))))
 329     (unless (string= (substring org-babel-python-eoe-indicator 1 -1) results)
 330       (org-babel-result-cond result-params
 331         results
 332         (org-babel-python-table-or-string results)))))
 333
 334 (defun org-babel-python-read-string (string)
 335   "Strip 's from around Python string."
 336   (if (string-match "^'\\([^\000]+\\)'$" string)
 337       (match-string 1 string)
 338     string))
 339
 340 (provide 'ob-python)
 341
 342
 343
 344 ;;; ob-python.el ends here