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Daniel Weschke
2022-01-04 21:35:17 +01:00
parent 1d5275c946
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;;; ob-python.el --- Babel Functions for Python -*- lexical-binding: t; -*-
;; Copyright (C) 2009-2021 Free Software Foundation, Inc.
;; Authors: Eric Schulte
;; Dan Davison
;; Maintainer: Jack Kamm <jackkamm@gmail.com>
;; Keywords: literate programming, reproducible research
;; Homepage: https://orgmode.org
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Org-Babel support for evaluating python source code.
;;; Code:
(require 'ob)
(require 'org-macs)
(require 'python)
(declare-function py-shell "ext:python-mode" (&rest args))
(declare-function py-toggle-shells "ext:python-mode" (arg))
(declare-function py-shell-send-string "ext:python-mode" (strg &optional process))
(defvar org-babel-tangle-lang-exts)
(add-to-list 'org-babel-tangle-lang-exts '("python" . "py"))
(defvar org-babel-default-header-args:python '())
(defcustom org-babel-python-command "python"
"Name of the command for executing Python code."
:version "24.4"
:package-version '(Org . "8.0")
:group 'org-babel
:type 'string)
(defcustom org-babel-python-mode
(if (featurep 'python-mode) 'python-mode 'python)
"Preferred python mode for use in running python interactively.
This will typically be either `python' or `python-mode'."
:group 'org-babel
:version "24.4"
:package-version '(Org . "8.0")
:type 'symbol)
(defcustom org-babel-python-hline-to "None"
"Replace hlines in incoming tables with this when translating to python."
:group 'org-babel
:version "24.4"
:package-version '(Org . "8.0")
:type 'string)
(defcustom org-babel-python-None-to 'hline
"Replace `None' in python tables with this before returning."
:group 'org-babel
:version "24.4"
:package-version '(Org . "8.0")
:type 'symbol)
(defun org-babel-execute:python (body params)
"Execute a block of Python code with Babel.
This function is called by `org-babel-execute-src-block'."
(let* ((org-babel-python-command
(or (cdr (assq :python params))
org-babel-python-command))
(session (org-babel-python-initiate-session
(cdr (assq :session params))))
(result-params (cdr (assq :result-params params)))
(result-type (cdr (assq :result-type params)))
(return-val (when (eq result-type 'value)
(cdr (assq :return params))))
(preamble (cdr (assq :preamble params)))
(async (org-babel-comint-use-async params))
(full-body
(concat
(org-babel-expand-body:generic
body params
(org-babel-variable-assignments:python params))
(when return-val
(format (if session "\n%s" "\nreturn %s") return-val))))
(result (org-babel-python-evaluate
session full-body result-type
result-params preamble async)))
(org-babel-reassemble-table
result
(org-babel-pick-name (cdr (assq :colname-names params))
(cdr (assq :colnames params)))
(org-babel-pick-name (cdr (assq :rowname-names params))
(cdr (assq :rownames params))))))
(defun org-babel-prep-session:python (session params)
"Prepare SESSION according to the header arguments in PARAMS.
VARS contains resolved variable references."
(let* ((session (org-babel-python-initiate-session session))
(var-lines
(org-babel-variable-assignments:python params)))
(org-babel-comint-in-buffer session
(mapc (lambda (var)
(end-of-line 1) (insert var) (comint-send-input)
(org-babel-comint-wait-for-output session))
var-lines))
session))
(defun org-babel-load-session:python (session body params)
"Load BODY into SESSION."
(save-window-excursion
(let ((buffer (org-babel-prep-session:python session params)))
(with-current-buffer buffer
(goto-char (process-mark (get-buffer-process (current-buffer))))
(insert (org-babel-chomp body)))
buffer)))
;; helper functions
(defun org-babel-variable-assignments:python (params)
"Return a list of Python statements assigning the block's variables."
(mapcar
(lambda (pair)
(format "%s=%s"
(car pair)
(org-babel-python-var-to-python (cdr pair))))
(org-babel--get-vars params)))
(defun org-babel-python-var-to-python (var)
"Convert an elisp value to a python variable.
Convert an elisp value, VAR, into a string of python source code
specifying a variable of the same value."
(if (listp var)
(concat "[" (mapconcat #'org-babel-python-var-to-python var ", ") "]")
(if (eq var 'hline)
org-babel-python-hline-to
(format
(if (and (stringp var) (string-match "[\n\r]" var)) "\"\"%S\"\"" "%S")
(if (stringp var) (substring-no-properties var) var)))))
(defun org-babel-python-table-or-string (results)
"Convert RESULTS into an appropriate elisp value.
If the results look like a list or tuple, then convert them into an
Emacs-lisp table, otherwise return the results as a string."
(let ((res (org-babel-script-escape results)))
(if (listp res)
(mapcar (lambda (el) (if (eq el 'None)
org-babel-python-None-to el))
res)
res)))
(defvar org-babel-python-buffers '((:default . "*Python*")))
(defun org-babel-python-session-buffer (session)
"Return the buffer associated with SESSION."
(cdr (assoc session org-babel-python-buffers)))
(defun org-babel-python-with-earmuffs (session)
(let ((name (if (stringp session) session (format "%s" session))))
(if (and (string= "*" (substring name 0 1))
(string= "*" (substring name (- (length name) 1))))
name
(format "*%s*" name))))
(defun org-babel-python-without-earmuffs (session)
(let ((name (if (stringp session) session (format "%s" session))))
(if (and (string= "*" (substring name 0 1))
(string= "*" (substring name (- (length name) 1))))
(substring name 1 (- (length name) 1))
name)))
(defvar py-default-interpreter)
(defvar py-which-bufname)
(defvar python-shell-buffer-name)
(defun org-babel-python-initiate-session-by-key (&optional session)
"Initiate a python session.
If there is not a current inferior-process-buffer in SESSION
then create. Return the initialized session."
(save-window-excursion
(let* ((session (if session (intern session) :default))
(py-buffer (org-babel-python-session-buffer session))
(cmd (if (member system-type '(cygwin windows-nt ms-dos))
(concat org-babel-python-command " -i")
org-babel-python-command)))
(cond
((eq 'python org-babel-python-mode) ; python.el
(unless py-buffer
(setq py-buffer (org-babel-python-with-earmuffs session)))
(let ((python-shell-buffer-name
(org-babel-python-without-earmuffs py-buffer)))
(run-python cmd)
(sleep-for 0 10)))
((and (eq 'python-mode org-babel-python-mode)
(fboundp 'py-shell)) ; python-mode.el
(require 'python-mode)
;; Make sure that py-which-bufname is initialized, as otherwise
;; it will be overwritten the first time a Python buffer is
;; created.
(py-toggle-shells py-default-interpreter)
;; `py-shell' creates a buffer whose name is the value of
;; `py-which-bufname' with '*'s at the beginning and end
(let* ((bufname (if (and py-buffer (buffer-live-p py-buffer))
(replace-regexp-in-string ;; zap surrounding *
"^\\*\\([^*]+\\)\\*$" "\\1" py-buffer)
(concat "Python-" (symbol-name session))))
(py-which-bufname bufname))
(setq py-buffer (org-babel-python-with-earmuffs bufname))
(py-shell nil nil t org-babel-python-command py-buffer nil nil t nil)))
(t
(error "No function available for running an inferior Python")))
(setq org-babel-python-buffers
(cons (cons session py-buffer)
(assq-delete-all session org-babel-python-buffers)))
session)))
(defun org-babel-python-initiate-session (&optional session _params)
"Create a session named SESSION according to PARAMS."
(unless (string= session "none")
(org-babel-python-session-buffer
(org-babel-python-initiate-session-by-key session))))
(defvar org-babel-python-eoe-indicator "org_babel_python_eoe"
"A string to indicate that evaluation has completed.")
(defconst org-babel-python-wrapper-method
"
def main():
%s
open('%s', 'w').write( str(main()) )")
(defconst org-babel-python-pp-wrapper-method
"
import pprint
def main():
%s
open('%s', 'w').write( pprint.pformat(main()) )")
(defconst org-babel-python--exec-tmpfile "\
with open('%s') as __org_babel_python_tmpfile:
exec(compile(__org_babel_python_tmpfile.read(), __org_babel_python_tmpfile.name, 'exec'))"
"Template for Python session command with output results.
Has a single %s escape, the tempfile containing the source code
to evaluate.")
(defun org-babel-python-format-session-value
(src-file result-file result-params)
"Return Python code to evaluate SRC-FILE and write result to RESULT-FILE."
(format "\
import ast
with open('%s') as __org_babel_python_tmpfile:
__org_babel_python_ast = ast.parse(__org_babel_python_tmpfile.read())
__org_babel_python_final = __org_babel_python_ast.body[-1]
if isinstance(__org_babel_python_final, ast.Expr):
__org_babel_python_ast.body = __org_babel_python_ast.body[:-1]
exec(compile(__org_babel_python_ast, '<string>', 'exec'))
__org_babel_python_final = eval(compile(ast.Expression(
__org_babel_python_final.value), '<string>', 'eval'))
with open('%s', 'w') as __org_babel_python_tmpfile:
if %s:
import pprint
__org_babel_python_tmpfile.write(pprint.pformat(__org_babel_python_final))
else:
__org_babel_python_tmpfile.write(str(__org_babel_python_final))
else:
exec(compile(__org_babel_python_ast, '<string>', 'exec'))
__org_babel_python_final = None"
(org-babel-process-file-name src-file 'noquote)
(org-babel-process-file-name result-file 'noquote)
(if (member "pp" result-params) "True" "False")))
(defun org-babel-python-evaluate
(session body &optional result-type result-params preamble async)
"Evaluate BODY as Python code."
(if session
(if async
(org-babel-python-async-evaluate-session
session body result-type result-params)
(org-babel-python-evaluate-session
session body result-type result-params))
(org-babel-python-evaluate-external-process
body result-type result-params preamble)))
(defun org-babel-python--shift-right (body &optional count)
(with-temp-buffer
(python-mode)
(insert body)
(goto-char (point-min))
(while (not (eobp))
(unless (python-syntax-context 'string)
(python-indent-shift-right (line-beginning-position)
(line-end-position)
count))
(forward-line 1))
(buffer-string)))
(defun org-babel-python-evaluate-external-process
(body &optional result-type result-params preamble)
"Evaluate BODY in external python process.
If RESULT-TYPE equals `output' then return standard output as a
string. If RESULT-TYPE equals `value' then return the value of the
last statement in BODY, as elisp."
(let ((raw
(pcase result-type
(`output (org-babel-eval org-babel-python-command
(concat preamble (and preamble "\n")
body)))
(`value (let ((tmp-file (org-babel-temp-file "python-")))
(org-babel-eval
org-babel-python-command
(concat
preamble (and preamble "\n")
(format
(if (member "pp" result-params)
org-babel-python-pp-wrapper-method
org-babel-python-wrapper-method)
(org-babel-python--shift-right body)
(org-babel-process-file-name tmp-file 'noquote))))
(org-babel-eval-read-file tmp-file))))))
(org-babel-result-cond result-params
raw
(org-babel-python-table-or-string (org-trim raw)))))
(defun org-babel-python--send-string (session body)
"Pass BODY to the Python process in SESSION.
Return output."
(with-current-buffer session
(let* ((string-buffer "")
(comint-output-filter-functions
(cons (lambda (text) (setq string-buffer
(concat string-buffer text)))
comint-output-filter-functions))
(body (format "\
try:
%s
except:
raise
finally:
print('%s')"
(org-babel-python--shift-right body 4)
org-babel-python-eoe-indicator)))
(if (not (eq 'python-mode org-babel-python-mode))
(let ((python-shell-buffer-name
(org-babel-python-without-earmuffs session)))
(python-shell-send-string body))
(require 'python-mode)
(py-shell-send-string body (get-buffer-process session)))
;; same as `python-shell-comint-end-of-output-p' in emacs-25.1+
(while (not (string-match
org-babel-python-eoe-indicator
string-buffer))
(accept-process-output (get-buffer-process (current-buffer))))
(org-babel-chomp (substring string-buffer 0 (match-beginning 0))))))
(defun org-babel-python-evaluate-session
(session body &optional result-type result-params)
"Pass BODY to the Python process in SESSION.
If RESULT-TYPE equals `output' then return standard output as a
string. If RESULT-TYPE equals `value' then return the value of the
last statement in BODY, as elisp."
(let* ((tmp-src-file (org-babel-temp-file "python-"))
(results
(progn
(with-temp-file tmp-src-file (insert body))
(pcase result-type
(`output
(let ((body (format org-babel-python--exec-tmpfile
(org-babel-process-file-name
tmp-src-file 'noquote))))
(org-babel-python--send-string session body)))
(`value
(let* ((tmp-results-file (org-babel-temp-file "python-"))
(body (org-babel-python-format-session-value
tmp-src-file tmp-results-file result-params)))
(org-babel-python--send-string session body)
(sleep-for 0 10)
(org-babel-eval-read-file tmp-results-file)))))))
(org-babel-result-cond result-params
results
(org-babel-python-table-or-string results))))
(defun org-babel-python-read-string (string)
"Strip \\='s from around Python string."
(if (and (string-prefix-p "'" string)
(string-suffix-p "'" string))
(substring string 1 -1)
string))
;; Async session eval
(defconst org-babel-python-async-indicator "print ('ob_comint_async_python_%s_%s')")
(defun org-babel-python-async-value-callback (params tmp-file)
(let ((result-params (cdr (assq :result-params params)))
(results (org-babel-eval-read-file tmp-file)))
(org-babel-result-cond result-params
results
(org-babel-python-table-or-string results))))
(defun org-babel-python-async-evaluate-session
(session body &optional result-type result-params)
"Asynchronously evaluate BODY in SESSION.
Returns a placeholder string for insertion, to later be replaced
by `org-babel-comint-async-filter'."
(org-babel-comint-async-register
session (current-buffer)
"ob_comint_async_python_\\(.+\\)_\\(.+\\)"
'org-babel-chomp 'org-babel-python-async-value-callback)
(let ((python-shell-buffer-name (org-babel-python-without-earmuffs session)))
(pcase result-type
(`output
(let ((uuid (md5 (number-to-string (random 100000000)))))
(with-temp-buffer
(insert (format org-babel-python-async-indicator "start" uuid))
(insert "\n")
(insert body)
(insert "\n")
(insert (format org-babel-python-async-indicator "end" uuid))
(python-shell-send-buffer))
uuid))
(`value
(let ((tmp-results-file (org-babel-temp-file "python-"))
(tmp-src-file (org-babel-temp-file "python-")))
(with-temp-file tmp-src-file (insert body))
(with-temp-buffer
(insert (org-babel-python-format-session-value tmp-src-file tmp-results-file result-params))
(insert "\n")
(insert (format org-babel-python-async-indicator "file" tmp-results-file))
(python-shell-send-buffer))
tmp-results-file)))))
(provide 'ob-python)
;;; ob-python.el ends here