Add 2012 to FSF copyright years for Emacs files

[bpt/emacs.git] / lisp / progmodes / python.el

;;; python.el --- silly walks for Python  -*- coding: iso-8859-1 -*-

;; Copyright (C) 2003-2012  Free Software Foundation, Inc.

;; Author: Dave Love <fx@gnu.org>
;; Maintainer: FSF
;; Created: Nov 2003
;; Keywords: languages

;; 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 <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Major mode for editing Python, with support for inferior processes.

;; There is another Python mode, python-mode.el:
;; http://launchpad.net/python-mode
;; used by XEmacs, and originally maintained with Python.
;; That isn't covered by an FSF copyright assignment (?), unlike this
;; code, and seems not to be well-maintained for Emacs (though I've
;; submitted fixes).  This mode is rather simpler and is better in
;; other ways.  In particular, using the syntax functions with text
;; properties maintained by font-lock makes it more correct with
;; arbitrary string and comment contents.

;; This doesn't implement all the facilities of python-mode.el.  Some
;; just need doing, e.g. catching exceptions in the inferior Python
;; buffer (but see M-x pdb for debugging).  [Actually, the use of
;; `compilation-shell-minor-mode' now is probably enough for that.]
;; Others don't seem appropriate.  For instance,
;; `forward-into-nomenclature' should be done separately, since it's
;; not specific to Python, and I've installed a minor mode to do the
;; job properly in Emacs 23.  [CC mode 5.31 contains an incompatible
;; feature, `subword-mode' which is intended to have a similar
;; effect, but actually only affects word-oriented keybindings.]

;; Other things seem more natural or canonical here, e.g. the
;; {beginning,end}-of-defun implementation dealing with nested
;; definitions, and the inferior mode following `cmuscheme'.  (The
;; inferior mode can find the source of errors from
;; `python-send-region' & al via `compilation-shell-minor-mode'.)
;; There is (limited) symbol completion using lookup in Python and
;; Eldoc support also using the inferior process.  Successive TABs
;; cycle between possible indentations for the line.

;; Even where it has similar facilities, this mode is incompatible
;; with python-mode.el in some respects.  For instance, various key
;; bindings are changed to obey Emacs conventions.

;; TODO: See various Fixmes below.

;; Fixme: This doesn't support (the nascent) Python 3 .

;;; Code:

(require 'comint)

(eval-when-compile
  (require 'compile)
  (require 'hippie-exp))

(autoload 'comint-mode "comint")

(defgroup python nil
  "Silly walks in the Python language."
  :group 'languages
  :version "22.1"
  :link '(emacs-commentary-link "python"))
\f
;;;###autoload
(add-to-list 'interpreter-mode-alist (cons (purecopy "jython") 'jython-mode))
;;;###autoload
(add-to-list 'interpreter-mode-alist (cons (purecopy "python") 'python-mode))
;;;###autoload
(add-to-list 'auto-mode-alist (cons (purecopy "\\.py\\'")  'python-mode))
\f
;;;; Font lock

(defvar python-font-lock-keywords
  `(,(rx symbol-start