emacs-prelude/modules/prelude-python.el

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;;; prelude-python.el --- Emacs Prelude: python.el configuration.
;;
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;; Copyright © 2011-2017 Bozhidar Batsov
;;
;; Author: Bozhidar Batsov <bozhidar@batsov.com>
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;; URL: https://github.com/bbatsov/prelude
;; Version: 1.0.0
;; Keywords: convenience
;; This file is not part of GNU Emacs.
;;; Commentary:
;; Some basic configuration for python.el (the latest and greatest
;; Python mode Emacs has to offer).
;;; License:
;; This program 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.
;;
;; This program 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; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Code:
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(prelude-require-package 'anaconda-mode)
(when (boundp 'company-backends)
(prelude-require-package 'company-anaconda)
(add-to-list 'company-backends 'company-anaconda))
(require 'electric)
(require 'prelude-programming)
;; Copy pasted from ruby-mode.el
(defun prelude-python--encoding-comment-required-p ()
(re-search-forward "[^\0-\177]" nil t))
(defun prelude-python--detect-encoding ()
(let ((coding-system
(or save-buffer-coding-system
buffer-file-coding-system)))
(if coding-system
(symbol-name
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(or (coding-system-get coding-system 'mime-charset)
(coding-system-change-eol-conversion coding-system nil)))
"ascii-8bit")))
(defun prelude-python--insert-coding-comment (encoding)
(let ((newlines (if (looking-at "^\\s *$") "\n" "\n\n")))
(insert (format "# coding: %s" encoding) newlines)))
(defun prelude-python-mode-set-encoding ()
"Insert a magic comment header with the proper encoding if necessary."
(save-excursion
(widen)
(goto-char (point-min))
(when (prelude-python--encoding-comment-required-p)
(goto-char (point-min))
(let ((coding-system (prelude-python--detect-encoding)))
(when coding-system
(if (looking-at "^#!") (beginning-of-line 2))
(cond ((looking-at "\\s *#\\s *.*\\(en\\)?coding\\s *:\\s *\\([-a-z0-9_]*\\)")
;; update existing encoding comment if necessary
(unless (string= (match-string 2) coding-system)
(goto-char (match-beginning 2))
(delete-region (point) (match-end 2))
(insert coding-system)))
((looking-at "\\s *#.*coding\\s *[:=]"))
(t (prelude-python--insert-coding-comment coding-system)))
(when (buffer-modified-p)
(basic-save-buffer-1)))))))
(when (fboundp 'exec-path-from-shell-copy-env)
(exec-path-from-shell-copy-env "PYTHONPATH"))
(defun prelude-python-mode-defaults ()
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"Defaults for Python programming."
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(subword-mode +1)
(anaconda-mode 1)
(eldoc-mode 1)
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(setq-local electric-layout-rules
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'((?: . (lambda ()
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(and (zerop (first (syntax-ppss)))
(python-info-statement-starts-block-p)
'after)))))
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(when (fboundp #'python-imenu-create-flat-index)
(setq-local imenu-create-index-function
#'python-imenu-create-flat-index))
(add-hook 'post-self-insert-hook
#'electric-layout-post-self-insert-function nil 'local)
(add-hook 'after-save-hook 'prelude-python-mode-set-encoding nil 'local))
(setq prelude-python-mode-hook 'prelude-python-mode-defaults)
(add-hook 'python-mode-hook (lambda ()
(run-hooks 'prelude-python-mode-hook)))
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(provide 'prelude-python)
;;; prelude-python.el ends here