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;;; python.el -- Python's flying circus support for Emacs

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;; Copyright (C) 2010, 2011 Free Software Foundation, Inc.
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;; Author: Fabián E. Gallina <fabian@anue.biz>
;; Maintainer: FSF
;; Created: Jul 2010
;; Keywords: languages

;; This file is NOT part of GNU Emacs.

;; python.el 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.

;; python.el 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 python.el.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Major mode for editing Python files with some fontification and
;; indentation bits extracted from original Dave Love's python.el
;; found in GNU/Emacs.

;; While it probably has less features than Dave Love's python.el and
;; PSF's python-mode.el it provides the main stuff you'll need while
;; keeping it simple :)

;; Implements Syntax highlighting, Indentation, Movement, Shell
;; interaction, Shell completion, Pdb tracking, Symbol completion,
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;; Skeletons, FFAP, Code Check, Eldoc.
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;; Syntax highlighting: Fontification of code is provided and supports
;; python's triple quoted strings properly.

;; Indentation: Automatic indentation with indentation cycling is
;; provided, it allows you to navigate different available levels of
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;; indentation by hitting <tab> several times.  Also when inserting a
;; colon the `python-indent-electric-colon' command is invoked and
;; causes the current line to be dedented automatically if needed.
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;; Movement: `beginning-of-defun' and `end-of-defun' functions are
;; properly implemented.  A `beginning-of-innermost-defun' is defined
;; to navigate nested defuns.

;; Shell interaction: is provided and allows you easily execute any
;; block of code of your current buffer in an inferior Python process.

;; Shell completion: hitting tab will try to complete the current
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;; word.  Shell completion is implemented in a manner that if you
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;; change the `python-shell-interpreter' to any other (for example
;; IPython) it should be easy to integrate another way to calculate
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;; completions.  You just need to specify your custom
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;; `python-shell-completion-setup-code' and
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;; `python-shell-completion-string-code'

;; Here is a complete example of the settings you would use for
;; iPython

;; (setq
;;  python-shell-interpreter "ipython"
;;  python-shell-interpreter-args ""
;;  python-shell-prompt-regexp "In \\[[0-9]+\\]: "
;;  python-shell-prompt-output-regexp "Out\\[[0-9]+\\]: "
;;  python-shell-completion-setup-code ""
;;  python-shell-completion-string-code
;;  "';'.join(__IP.complete('''%s'''))\n")
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;; Please note that the default completion system depends on the
;; readline module, so if you are using some Operating System that
;; bundles Python without it (like Windows) just install the
;; pyreadline from http://ipython.scipy.org/moin/PyReadline/Intro and
;; you should be good to go.

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;; Pdb tracking: when you execute a block of code that contains some
;; call to pdb (or ipdb) it will prompt the block of code and will
;; follow the execution of pdb marking the current line with an arrow.

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;; Symbol completion: you can complete the symbol at point.  It uses
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;; the shell completion in background so you should run
;; `python-shell-send-buffer' from time to time to get better results.

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;; Skeletons: 6 skeletons are provided for simple inserting of class,
;; def, for, if, try and while.  These skeletons are integrated with
;; dabbrev.  If you have `dabbrev-mode' activated and
;; `python-skeleton-autoinsert' is set to t, then whenever you type
;; the name of any of those defined and hit SPC, they will be
;; automatically expanded.

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;; FFAP: You can find the filename for a given module when using ffap
;; out of the box.  This feature needs an inferior python shell
;; running.

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;; Code check: Check the current file for errors using
;; `python-check-command'

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;; Eldoc: returns documentation for object at point by using the
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;; inferior python subprocess to inspect its documentation.  As you
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;; might guessed you should run `python-shell-send-buffer' from time
;; to time to get better results too.

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;; If you used python-mode.el you probably will miss auto-indentation
;; when inserting newlines.  To achieve the same behavior you have
;; two options:

;; 1) Use GNU/Emacs' standard binding for `newline-and-indent': C-j.

;; 2) Add the following hook in your .emacs:

;; (add-hook 'python-mode-hook
;;   #'(lambda ()
;;       (define-key python-mode-map "\C-m" 'newline-and-indent)))

;; I'd recommend the first one since you'll get the same behavior for
;; all modes out-of-the-box.

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;;; Installation:

;; Add this to your .emacs:

;; (add-to-list 'load-path "/folder/containing/file")
;; (require 'python)

;;; TODO:

;; Ordered by priority:

;; Better decorator support for beginning of defun

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;; Review code and cleanup
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;;; Code:

(require 'ansi-color)
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(require 'comint)
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(eval-when-compile
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  (require 'cl)
  ;; Avoid compiler warnings
  (defvar view-return-to-alist)
  (defvar compilation-error-regexp-alist)
  (defvar outline-heading-end-regexp))
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(autoload 'comint-mode "comint")

;;;###autoload
(add-to-list 'auto-mode-alist (cons (purecopy "\\.py\\'")  'python-mode))
;;;###autoload
(add-to-list 'interpreter-mode-alist (cons (purecopy "python") 'python-mode))

(defgroup python nil
  "Python Language's flying circus support for Emacs."
  :group 'languages
  :version "23.2"
  :link '(emacs-commentary-link "python"))


;;; Bindings

(defvar python-mode-map
  (let ((map (make-sparse-keymap)))
    ;; Indent specific
    (define-key map "\177" 'python-indent-dedent-line-backspace)
    (define-key map (kbd "<backtab>") 'python-indent-dedent-line)
    (define-key map "\C-c<" 'python-indent-shift-left)
    (define-key map "\C-c>" 'python-indent-shift-right)
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    (define-key map ":" 'python-indent-electric-colon)
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    ;; Skeletons
    (define-key map "\C-c\C-tc" 'python-skeleton-class)
    (define-key map "\C-c\C-td" 'python-skeleton-def)
    (define-key map "\C-c\C-tf" 'python-skeleton-for)
    (define-key map "\C-c\C-ti" 'python-skeleton-if)
    (define-key map "\C-c\C-tt" 'python-skeleton-try)
    (define-key map "\C-c\C-tw" 'python-skeleton-while)
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    ;; Shell interaction
    (define-key map "\C-c\C-s" 'python-shell-send-string)
    (define-key map "\C-c\C-r" 'python-shell-send-region)
    (define-key map "\C-\M-x" 'python-shell-send-defun)
    (define-key map "\C-c\C-c" 'python-shell-send-buffer)
    (define-key map "\C-c\C-l" 'python-shell-send-file)
    (define-key map "\C-c\C-z" 'python-shell-switch-to-shell)
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    ;; Some util commands
    (define-key map "\C-c\C-v" 'python-check)
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    (define-key map "\C-c\C-f" 'python-eldoc-at-point)
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    ;; Utilities
    (substitute-key-definition 'complete-symbol 'completion-at-point
			       map global-map)
    (easy-menu-define python-menu map "Python Mode menu"
      `("Python"
	:help "Python-specific Features"
	["Shift region left" python-indent-shift-left :active mark-active
	 :help "Shift region left by a single indentation step"]
	["Shift region right" python-indent-shift-right :active mark-active
	 :help "Shift region right by a single indentation step"]
	"-"
	["Mark def/class" mark-defun
	 :help "Mark outermost definition around point"]
	"-"
	["Start of def/class" beginning-of-defun
	 :help "Go to start of outermost definition around point"]
	["Start of def/class" python-beginning-of-innermost-defun
	 :help "Go to start of innermost definition around point"]
	["End of def/class" end-of-defun
	 :help "Go to end of definition around point"]
        "-"
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	("Skeletons")
        "-"
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	["Start interpreter" run-python
	 :help "Run inferior Python process in a separate buffer"]
	["Switch to shell" python-shell-switch-to-shell
	 :help "Switch to running inferior Python process"]
	["Eval string" python-shell-send-string
	 :help "Eval string in inferior Python session"]
	["Eval buffer" python-shell-send-buffer
	 :help "Eval buffer in inferior Python session"]
	["Eval region" python-shell-send-region
	 :help "Eval region in inferior Python session"]
	["Eval defun" python-shell-send-defun
	 :help "Eval defun in inferior Python session"]
	["Eval file" python-shell-send-file
	 :help "Eval file in inferior Python session"]
	["Debugger" pdb :help "Run pdb under GUD"]
        "-"
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	["Check file" python-check
	 :help "Check file for errors"]
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	["Help on symbol" python-eldoc-at-point
	 :help "Get help on symbol at point"]
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	["Complete symbol" completion-at-point
	 :help "Complete symbol before point"]))
    map)
  "Keymap for `python-mode'.")


;;; Python specialized rx

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(eval-when-compile
  (defconst python-rx-constituents
    (list
     `(block-start          . ,(rx symbol-start
                                   (or "def" "class" "if" "elif" "else" "try"
                                       "except" "finally" "for" "while" "with")
                                   symbol-end))
     `(defun                . ,(rx symbol-start (or "def" "class") symbol-end))
     `(open-paren           . ,(rx (or "{" "[" "(")))
     `(close-paren          . ,(rx (or "}" "]" ")")))
     `(simple-operator      . ,(rx (any ?+ ?- ?/ ?& ?^ ?~ ?| ?* ?< ?> ?= ?%)))
     `(not-simple-operator  . ,(rx (not (any ?+ ?- ?/ ?& ?^ ?~ ?| ?* ?< ?> ?= ?%))))
     `(operator             . ,(rx (or "+" "-" "/" "&" "^" "~" "|" "*" "<" ">"
                                       "=" "%" "**" "//" "<<" ">>" "<=" "!="
                                       "==" ">=" "is" "not")))
     `(assignment-operator  . ,(rx (or "=" "+=" "-=" "*=" "/=" "//=" "%=" "**="
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                                       ">>=" "<<=" "&=" "^=" "|="))))
    "Additional Python specific sexps for `python-rx'"))
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(defmacro python-rx (&rest regexps)
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 "Python mode especialized rx macro which supports common python named REGEXPS."
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 (let ((rx-constituents (append python-rx-constituents rx-constituents)))
   (cond ((null regexps)
          (error "No regexp"))
         ((cdr regexps)
          (rx-to-string `(and ,@regexps) t))
         (t
          (rx-to-string (car regexps) t)))))


;;; Font-lock and syntax

(defvar python-font-lock-keywords
  ;; Keywords
  `(,(rx symbol-start
         (or "and" "del" "from" "not" "while" "as" "elif" "global" "or" "with"
             "assert" "else" "if" "pass" "yield" "break" "except" "import"
             "print" "class" "exec" "in" "raise" "continue" "finally" "is"
             "return" "def" "for" "lambda" "try" "self")
         symbol-end)
    ;; functions
    (,(rx symbol-start "def" (1+ space) (group (1+ (or word ?_))))
     (1 font-lock-function-name-face))
    ;; classes
    (,(rx symbol-start "class" (1+ space) (group (1+ (or word ?_))))
     (1 font-lock-type-face))
    ;; Constants
    (,(rx symbol-start (group "None" symbol-end))
     (1 font-lock-constant-face))
    ;; Decorators.
    (,(rx line-start (* (any " \t")) (group "@" (1+ (or word ?_))
                                            (0+ "." (1+ (or word ?_)))))
     (1 font-lock-type-face))
    ;; Builtin Exceptions
    (,(rx symbol-start
          (or "ArithmeticError" "AssertionError" "AttributeError"
              "BaseException" "BufferError" "BytesWarning" "DeprecationWarning"
              "EOFError" "EnvironmentError" "Exception" "FloatingPointError"
              "FutureWarning" "GeneratorExit" "IOError" "ImportError"
              "ImportWarning" "IndentationError" "IndexError" "KeyError"
              "KeyboardInterrupt" "LookupError" "MemoryError" "NameError"
              "NotImplemented" "NotImplementedError" "OSError" "OverflowError"
              "PendingDeprecationWarning" "ReferenceError" "RuntimeError"
              "RuntimeWarning" "StandardError" "StopIteration" "SyntaxError"
              "SyntaxWarning" "SystemError" "SystemExit" "TabError" "TypeError"
              "UnboundLocalError" "UnicodeDecodeError" "UnicodeEncodeError"
              "UnicodeError" "UnicodeTranslateError" "UnicodeWarning"
              "UserWarning" "ValueError" "Warning" "ZeroDivisionError")
          symbol-end) . font-lock-type-face)
    ;; Builtins
    (,(rx (or line-start (not (any ". \t"))) (* (any " \t")) symbol-start
	  (group
           (or "_" "__debug__" "__doc__" "__import__" "__name__" "__package__"
               "abs" "all" "any" "apply" "basestring" "bin" "bool" "buffer"
               "bytearray" "bytes" "callable" "chr" "classmethod" "cmp" "coerce"
               "compile" "complex" "copyright" "credits" "delattr" "dict" "dir"
               "divmod" "enumerate" "eval" "execfile" "exit" "file" "filter"
               "float" "format" "frozenset" "getattr" "globals" "hasattr" "hash"
               "help" "hex" "id" "input" "int" "intern" "isinstance" "issubclass"
               "iter" "len" "license" "list" "locals" "long" "map" "max" "min"
               "next" "object" "oct" "open" "ord" "pow" "print" "property" "quit"
               "range" "raw_input" "reduce" "reload" "repr" "reversed" "round"
               "set" "setattr" "slice" "sorted" "staticmethod" "str" "sum"
               "super" "tuple" "type" "unichr" "unicode" "vars" "xrange" "zip"
               "True" "False" "Ellipsis")) symbol-end)
     (1 font-lock-builtin-face))
    ;; asignations
    ;; support for a = b = c = 5
    (,(lambda (limit)
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        (let ((re (python-rx (group (+ (any word ?. ?_)))
                             (? ?\[ (+ (not (any  ?\]))) ?\]) (* space)
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                             assignment-operator)))
          (when (re-search-forward re limit t)
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            (while (and (python-info-ppss-context 'paren)
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                        (re-search-forward re limit t)))
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            (if (and (not (python-info-ppss-context 'paren))
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                     (not (equal (char-after (point-marker)) ?=)))
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                t
              (set-match-data nil)))))
     (1 font-lock-variable-name-face nil nil))
    ;; support for a, b, c = (1, 2, 3)
    (,(lambda (limit)
        (let ((re (python-rx (group (+ (any word ?. ?_))) (* space)
                             (* ?, (* space) (+ (any word ?. ?_)) (* space))
                             ?, (* space) (+ (any word ?. ?_)) (* space)
                             assignment-operator)))
          (when (and (re-search-forward re limit t)
                     (goto-char (nth 3 (match-data))))
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            (while (and (python-info-ppss-context 'paren)
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                        (re-search-forward re limit t))
              (goto-char (nth 3 (match-data))))
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            (if (not (python-info-ppss-context 'paren))
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                t
              (set-match-data nil)))))
     (1 font-lock-variable-name-face nil nil))))

;; Fixme: Is there a better way?
(defconst python-font-lock-syntactic-keywords
  ;; First avoid a sequence preceded by an odd number of backslashes.
  `((,(rx (not (any ?\\))
	  ?\\ (* (and ?\\ ?\\))
	  (group (syntax string-quote))
	  (backref 1)
	  (group (backref 1)))
     (2 ,(string-to-syntax "\"")))	; dummy
    (,(rx (group (optional (any "uUrR"))) ; prefix gets syntax property
	  (optional (any "rR"))		  ; possible second prefix
	  (group (syntax string-quote))   ; maybe gets property
	  (backref 2)			  ; per first quote
	  (group (backref 2)))		  ; maybe gets property
     (1 (python-quote-syntax 1))
     (2 (python-quote-syntax 2))
     (3 (python-quote-syntax 3))))
  "Make outer chars of triple-quote strings into generic string delimiters.")

(defun python-quote-syntax (n)
  "Put `syntax-table' property correctly on triple quote.
Used for syntactic keywords.  N is the match number (1, 2 or 3)."
  ;; Given a triple quote, we have to check the context to know
  ;; whether this is an opening or closing triple or whether it's
  ;; quoted anyhow, and should be ignored.  (For that we need to do
  ;; the same job as `syntax-ppss' to be correct and it seems to be OK
  ;; to use it here despite initial worries.)  We also have to sort
  ;; out a possible prefix -- well, we don't _have_ to, but I think it
  ;; should be treated as part of the string.

  ;; Test cases:
  ;;  ur"""ar""" x='"' # """
  ;; x = ''' """ ' a
  ;; '''
  ;; x '"""' x """ \"""" x
  (save-excursion
    (goto-char (match-beginning 0))
    (cond
     ;; Consider property for the last char if in a fenced string.
     ((= n 3)
      (let* ((font-lock-syntactic-keywords nil)
	     (syntax (syntax-ppss)))
	(when (eq t (nth 3 syntax))	; after unclosed fence
	  (goto-char (nth 8 syntax))	; fence position
	  (skip-chars-forward "uUrR")	; skip any prefix
	  ;; Is it a matching sequence?
	  (if (eq (char-after) (char-after (match-beginning 2)))
	      (eval-when-compile (string-to-syntax "|"))))))
     ;; Consider property for initial char, accounting for prefixes.
     ((or (and (= n 2)			; leading quote (not prefix)
	       (= (match-beginning 1) (match-end 1))) ; prefix is null
	  (and (= n 1)			; prefix
	       (/= (match-beginning 1) (match-end 1)))) ; non-empty
      (let ((font-lock-syntactic-keywords nil))
	(unless (eq 'string (syntax-ppss-context (syntax-ppss)))
	  (eval-when-compile (string-to-syntax "|")))))
     ;; Otherwise (we're in a non-matching string) the property is
     ;; nil, which is OK.
     )))

(defvar python-mode-syntax-table
  (let ((table (make-syntax-table)))
    ;; Give punctuation syntax to ASCII that normally has symbol
    ;; syntax or has word syntax and isn't a letter.
    (let ((symbol (string-to-syntax "_"))
	  (sst (standard-syntax-table)))
      (dotimes (i 128)
	(unless (= i ?_)
	  (if (equal symbol (aref sst i))
	      (modify-syntax-entry i "." table)))))
    (modify-syntax-entry ?$ "." table)
    (modify-syntax-entry ?% "." table)
    ;; exceptions
    (modify-syntax-entry ?# "<" table)
    (modify-syntax-entry ?\n ">" table)
    (modify-syntax-entry ?' "\"" table)
    (modify-syntax-entry ?` "$" table)
    table)
  "Syntax table for Python files.")

(defvar python-dotty-syntax-table
  (let ((table (make-syntax-table python-mode-syntax-table)))
    (modify-syntax-entry ?. "w" table)
    (modify-syntax-entry ?_ "w" table)
    table)
  "Dotty syntax table for Python files.
It makes underscores and dots word constituent chars.")


;;; Indentation

(defcustom python-indent-offset 4
  "Default indentation offset for Python."
  :group 'python
  :type 'integer
  :safe 'integerp)

(defcustom python-indent-guess-indent-offset t
  "Non-nil tells Python mode to guess `python-indent-offset' value."
  :type 'boolean
  :group 'python)

(defvar python-indent-current-level 0
  "Current indentation level `python-indent-line-function' is using.")

(defvar python-indent-levels '(0)
  "Levels of indentation available for `python-indent-line-function'.")

(defvar python-indent-dedenters '("else" "elif" "except" "finally")
  "List of words that should be dedented.
These make `python-indent-calculate-indentation' subtract the value of
`python-indent-offset'.")

(defun python-indent-guess-indent-offset ()
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  "Guess and set `python-indent-offset' for the current buffer."
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    (save-excursion
      (save-restriction
        (widen)
        (goto-char (point-min))
        (let ((found-block))
          (while (and (not found-block)
                      (re-search-forward
                       (python-rx line-start block-start) nil t))
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            (when (and (not (python-info-ppss-context 'string))
                       (not (python-info-ppss-context 'comment))
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                       (progn
                         (goto-char (line-end-position))
                         (forward-comment -1)
                         (eq ?: (char-before))))
              (setq found-block t)))
          (if (not found-block)
              (message "Can't guess python-indent-offset, using defaults: %s"
                       python-indent-offset)
            (while (and (progn
                          (goto-char (line-end-position))
                          (python-info-continuation-line-p))
                        (not (eobp)))
              (forward-line 1))
            (forward-line 1)
            (forward-comment 1)
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            (let ((indent-offset (current-indentation)))
              (when (> indent-offset 0)
                (setq python-indent-offset indent-offset))))))))
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(defun python-indent-context ()
  "Get information on indentation context.
Context information is returned with a cons with the form:
    \(STATUS . START)
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Where status can be any of the following symbols:
 * inside-paren: If point in between (), {} or []
 * inside-string: If point is inside a string
 * after-backslash: Previous line ends in a backslash
 * after-beginning-of-block: Point is after beginning of block
 * after-line: Point is after normal line
 * no-indent: Point is at beginning of buffer or other special case
START is the buffer position where the sexp starts."
  (save-restriction
    (widen)
    (let ((ppss (save-excursion (beginning-of-line) (syntax-ppss)))
          (start))
      (cons
       (cond
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        ;; Beginning of buffer
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        ((save-excursion
           (goto-char (line-beginning-position))
           (bobp))
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         'no-indent)
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        ;; Inside a paren
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        ((setq start (python-info-ppss-context 'paren ppss))
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         'inside-paren)
        ;; Inside string
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        ((setq start (python-info-ppss-context 'string ppss))
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         'inside-string)
        ;; After backslash
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        ((setq start (when (not (or (python-info-ppss-context 'string ppss)
                                    (python-info-ppss-context 'comment ppss)))
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                       (let ((line-beg-pos (line-beginning-position)))
                         (when (eq ?\\ (char-before (1- line-beg-pos)))
                           (- line-beg-pos 2)))))
         'after-backslash)
        ;; After beginning of block
        ((setq start (save-excursion
                       (let ((block-regexp (python-rx block-start))
                             (block-start-line-end ":[[:space:]]*$"))
                         (back-to-indentation)
                         (while (and (forward-comment -1) (not (bobp))))
                         (back-to-indentation)
                         (when (or (python-info-continuation-line-p)
                                   (and (not (looking-at block-regexp))
                                        (save-excursion
                                          (re-search-forward
                                           block-start-line-end
                                           (line-end-position) t))))
                           (while (and (forward-line -1)
                                       (python-info-continuation-line-p)
                                       (not (bobp))))
                           (when (not (looking-at block-regexp))
                             (forward-line 1)))
                         (back-to-indentation)
                         (when (and (looking-at block-regexp)
                                    (or (re-search-forward
                                         block-start-line-end
                                         (line-end-position) t)
                                        (python-info-continuation-line-p)))
                           (point-marker)))))
         'after-beginning-of-block)
        ;; After normal line
        ((setq start (save-excursion
                       (while (and (forward-comment -1) (not (bobp))))
                       (while (and (not (back-to-indentation))
                                   (not (bobp))
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                                   (if (python-info-ppss-context 'paren)
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                                       (forward-line -1)
                                     (if (save-excursion
                                           (forward-line -1)
                                           (python-info-line-ends-backslash-p))
                                         (forward-line -1)))))
                       (point-marker)))
         'after-line)
        ;; Do not indent
        (t 'no-indent))
       start))))

(defun python-indent-calculate-indentation ()
  "Calculate correct indentation offset for the current line."
  (let* ((indentation-context (python-indent-context))
         (context-status (car indentation-context))
         (context-start (cdr indentation-context)))
    (save-restriction
      (widen)
      (save-excursion
        (case context-status
          ('no-indent 0)
          ('after-beginning-of-block
           (goto-char context-start)
           (+ (current-indentation) python-indent-offset))
          ('after-line
           (-
            (save-excursion
              (goto-char context-start)
              (current-indentation))
            (if (progn
                  (back-to-indentation)
                  (looking-at (regexp-opt python-indent-dedenters)))
                python-indent-offset
              0)))
          ('inside-string
           (goto-char context-start)
           (current-indentation))
          ('after-backslash
           (let* ((block-continuation
                   (save-excursion
                     (forward-line -1)
                     (python-info-block-continuation-line-p)))
                  (assignment-continuation
                   (save-excursion
                     (forward-line -1)
                     (python-info-assignment-continuation-line-p)))
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                  (dot-continuation
                   (save-excursion
                     (back-to-indentation)
                     (when (looking-at "\\.")
                       (forward-line -1)
                       (back-to-indentation)
                       (forward-char (length
                                      (with-syntax-table python-dotty-syntax-table
                                        (current-word))))
                       (re-search-backward "\\." (line-beginning-position) t 1)
                       (current-column))))
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                  (indentation (cond (block-continuation
                                      (goto-char block-continuation)
                                      (re-search-forward
                                       (python-rx block-start (* space))
                                       (line-end-position) t)
                                      (current-column))
                                     (assignment-continuation
                                      (goto-char assignment-continuation)
                                      (re-search-forward
                                       (python-rx simple-operator)
                                       (line-end-position) t)
                                      (forward-char 1)
                                      (re-search-forward
                                       (python-rx (* space))
                                       (line-end-position) t)
                                      (current-column))
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                                     (dot-continuation
                                      dot-continuation)
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                                     (t
                                      (goto-char context-start)
                                      (current-indentation)))))
             indentation))
          ('inside-paren
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           (or (save-excursion
                 (forward-comment 1)
                 (looking-at (regexp-opt '(")" "]" "}")))
                 (forward-char 1)
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                 (when (not (python-info-ppss-context 'paren))
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                   (goto-char context-start)
                   (back-to-indentation)
                   (current-column)))
               (-
                (save-excursion
                  (goto-char context-start)
                  (forward-char)
                  (save-restriction
                    (narrow-to-region
                     (line-beginning-position)
                     (line-end-position))
                    (forward-comment 1))
                  (if (looking-at "$")
                      (+ (current-indentation) python-indent-offset)
                    (forward-comment 1)
                    (current-column)))
                (if (progn
                      (back-to-indentation)
                      (looking-at (regexp-opt '(")" "]" "}"))))
                    python-indent-offset
                  0)))))))))
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(defun python-indent-calculate-levels ()
  "Calculate `python-indent-levels' and reset `python-indent-current-level'."
  (let* ((indentation (python-indent-calculate-indentation))
         (remainder (% indentation python-indent-offset))
         (steps (/ (- indentation remainder) python-indent-offset)))
    (setq python-indent-levels '())
    (setq python-indent-levels (cons 0 python-indent-levels))
    (dotimes (step steps)
      (setq python-indent-levels
            (cons (* python-indent-offset (1+ step)) python-indent-levels)))
    (when (not (eq 0 remainder))
      (setq python-indent-levels
            (cons (+ (* python-indent-offset steps) remainder)
                  python-indent-levels)))
    (setq python-indent-levels (nreverse python-indent-levels))
    (setq python-indent-current-level (1- (length python-indent-levels)))))

(defun python-indent-toggle-levels ()
  "Toggle `python-indent-current-level' over `python-indent-levels'."
  (setq python-indent-current-level (1- python-indent-current-level))
  (when (< python-indent-current-level 0)
    (setq python-indent-current-level (1- (length python-indent-levels)))))

(defun python-indent-line (&optional force-toggle)
  "Internal implementation of `python-indent-line-function'.
Uses the offset calculated in
`python-indent-calculate-indentation' and available levels
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indicated by the variable `python-indent-levels' to set the
current indentation.
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When the variable `last-command' is equal to
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`indent-for-tab-command' or FORCE-TOGGLE is non-nil it cycles
levels indicated in the variable `python-indent-levels' by
setting the current level in the variable
`python-indent-current-level'.
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When the variable `last-command' is not equal to
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`indent-for-tab-command' and FORCE-TOGGLE is nil it calculates
possible indentation levels and saves it in the variable
`python-indent-levels'.  Afterwards it sets the variable
`python-indent-current-level' correctly so offset is equal
to (`nth' `python-indent-current-level' `python-indent-levels')"
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  (if (or (and (eq this-command 'indent-for-tab-command)
               (eq last-command this-command))
          force-toggle)
      (python-indent-toggle-levels)
    (python-indent-calculate-levels))
  (beginning-of-line)
  (delete-horizontal-space)
  (indent-to (nth python-indent-current-level python-indent-levels))
  (save-restriction
    (widen)
    (let ((closing-block-point (python-info-closing-block)))
      (when closing-block-point
        (message "Closes %s" (buffer-substring
                              closing-block-point
                              (save-excursion
                                (goto-char closing-block-point)
                                (line-end-position))))))))

(defun python-indent-line-function ()
  "`indent-line-function' for Python mode.
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See `python-indent-line' for details."
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  (python-indent-line))

(defun python-indent-dedent-line ()
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  "De-indent current line."
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  (interactive "*")
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  (when (and (not (or (python-info-ppss-context 'string)
                      (python-info-ppss-context 'comment)))
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             (<= (point-marker) (save-excursion
                                  (back-to-indentation)
                                  (point-marker)))
             (> (current-column) 0))
    (python-indent-line t)
    t))

(defun python-indent-dedent-line-backspace (arg)
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  "De-indent current line.
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Argument ARG is passed to `backward-delete-char-untabify' when
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point is  not in between the indentation."
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  (interactive "*p")
  (when (not (python-indent-dedent-line))
    (backward-delete-char-untabify arg)))
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(put 'python-indent-dedent-line-backspace 'delete-selection 'supersede)
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(defun python-indent-region (start end)
  "Indent a python region automagically.

Called from a program, START and END specify the region to indent."
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  (let ((deactivate-mark nil))
    (save-excursion
      (goto-char end)
      (setq end (point-marker))
      (goto-char start)
      (or (bolp) (forward-line 1))
      (while (< (point) end)
        (or (and (bolp) (eolp))
            (let (word)
              (forward-line -1)
              (back-to-indentation)
              (setq word (current-word))
              (forward-line 1)
              (when word
                (beginning-of-line)
                (delete-horizontal-space)
                (indent-to (python-indent-calculate-indentation)))))
        (forward-line 1))
      (move-marker end nil))))
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(defun python-indent-shift-left (start end &optional count)
  "Shift lines contained in region START END by COUNT columns to the left.
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COUNT defaults to `python-indent-offset'.  If region isn't
active, the current line is shifted.  The shifted region includes
the lines in which START and END lie.  An error is signaled if
any lines in the region are indented less than COUNT columns."
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  (interactive
   (if mark-active
       (list (region-beginning) (region-end) current-prefix-arg)
     (list (line-beginning-position) (line-end-position) current-prefix-arg)))
  (if count
      (setq count (prefix-numeric-value count))
    (setq count python-indent-offset))
  (when (> count 0)
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    (let ((deactivate-mark nil))
      (save-excursion
        (goto-char start)
        (while (< (point) end)
          (if (and (< (current-indentation) count)
                   (not (looking-at "[ \t]*$")))
              (error "Can't shift all lines enough"))
          (forward-line))
        (indent-rigidly start end (- count))))))
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(add-to-list 'debug-ignored-errors "^Can't shift all lines enough")

(defun python-indent-shift-right (start end &optional count)
  "Shift lines contained in region START END by COUNT columns to the left.
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COUNT defaults to `python-indent-offset'.  If region isn't
active, the current line is shifted.  The shifted region includes
the lines in which START and END lie."
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  (interactive
   (if mark-active
       (list (region-beginning) (region-end) current-prefix-arg)
     (list (line-beginning-position) (line-end-position) current-prefix-arg)))
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  (let ((deactivate-mark nil))
    (if count
        (setq count (prefix-numeric-value count))
      (setq count python-indent-offset))
    (indent-rigidly start end count)))
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(defun python-indent-electric-colon (arg)
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  "Insert a colon and maybe de-indent the current line.
With numeric ARG, just insert that many colons.  With
\\[universal-argument], just insert a single colon."
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  (interactive "*P")
  (self-insert-command (if (not (integerp arg)) 1 arg))
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  (when (and (not arg)
             (eolp)
             (not (equal ?: (char-after (- (point-marker) 2))))
             (not (or (python-info-ppss-context 'string)
                      (python-info-ppss-context 'comment))))
    (let ((indentation (current-indentation))
          (calculated-indentation (python-indent-calculate-indentation)))
      (when (> indentation calculated-indentation)
        (save-excursion
          (indent-line-to calculated-indentation)
          (when (not (python-info-closing-block))
            (indent-line-to indentation)))))))
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(put 'python-indent-electric-colon 'delete-selection t)

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;;; Navigation

(defvar python-beginning-of-defun-regexp
  "^\\(def\\|class\\)[[:space:]]+[[:word:]]+"
  "Regular expresion matching beginning of outermost class or function.")

(defvar python-beginning-of-innermost-defun-regexp
  "^[[:space:]]*\\(def\\|class\\)[[:space:]]+[[:word:]]+"
  "Regular expresion matching beginning of innermost class or function.")

(defun python-beginning-of-defun (&optional innermost)
  "Move point to the beginning of innermost/outermost def or class.
If INNERMOST is non-nil then move to the beginning of the
innermost definition."
  (let ((starting-point (point-marker))
        (nonblank-line-indent)
        (defun-indent)
        (defun-point)
        (regexp (if innermost
                    python-beginning-of-innermost-defun-regexp
                  python-beginning-of-defun-regexp)))
    (back-to-indentation)
    (if (and (not (looking-at "@"))
             (not (looking-at regexp)))
        (forward-comment -1)
      (while (and (not (eobp))
                  (forward-line 1)
                  (not (back-to-indentation))
                  (looking-at "@"))))
    (when (not (looking-at regexp))
        (re-search-backward regexp nil t))
    (setq nonblank-line-indent (+ (current-indentation) python-indent-offset))
    (setq defun-indent (current-indentation))
    (setq defun-point (point-marker))
    (if (> nonblank-line-indent defun-indent)
        (progn
          (goto-char defun-point)
          (forward-line -1)
          (while (and (looking-at "@")
                      (forward-line -1)
                      (not (bobp))
                      (not (back-to-indentation))))
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          (unless (bobp)
            (forward-line 1))
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          (point-marker))
      (if innermost
          (python-beginning-of-defun)
        (goto-char starting-point)
        nil))))

(defun python-beginning-of-defun-function ()
  "Move point to the beginning of outermost def or class.
Returns nil if point is not in a def or class."
  (python-beginning-of-defun nil))

(defun python-beginning-of-innermost-defun ()
  "Move point to the beginning of innermost def or class.
Returns nil if point is not in a def or class."
  (interactive)
  (python-beginning-of-defun t))

(defun python-end-of-defun-function ()
  "Move point to the end of def or class.
Returns nil if point is not in a def or class."
  (let ((starting-point (point-marker))
        (defun-regexp (python-rx defun))
        (beg-defun-indent))
    (back-to-indentation)
    (if (looking-at "@")
	(while (and (not (eobp))
		    (forward-line 1)
		    (not (back-to-indentation))
		    (looking-at "@")))
      (while (and (not (bobp))
		  (not (progn (back-to-indentation) (current-word)))
		  (forward-line -1))))
    (when (or (not (equal (current-indentation) 0))
              (string-match defun-regexp (current-word)))
      (setq beg-defun-indent (save-excursion
        		       (or (looking-at defun-regexp)
        			   (python-beginning-of-innermost-defun))
        		       (current-indentation)))
      (while (and (forward-line 1)
        	  (not (eobp))
        	  (or (not (current-word))
                      (> (current-indentation) beg-defun-indent))))
      (while (and (forward-comment -1)
        	  (not (bobp))))
      (forward-line 1)
      (point-marker))))


;;; Shell integration

(defvar python-shell-buffer-name "Python"
  "Default buffer name for Python interpreter.")

(defcustom python-shell-interpreter "python"
  "Default Python interpreter for shell."
  :type 'string
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  :group 'python
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  :safe 'stringp)

(defcustom python-shell-interpreter-args "-i"
  "Default arguments for the Python interpreter."
  :type 'string
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  :group 'python
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  :safe 'stringp)

(defcustom python-shell-prompt-regexp ">>> "
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  "Regular Expression matching top\-level input prompt of python shell.
It should not contain a caret (^) at the beginning."
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  :type 'string
  :group 'python
  :safe 'stringp)

(defcustom python-shell-prompt-block-regexp "[.][.][.] "
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  "Regular Expression matching block input prompt of python shell.
It should not contain a caret (^) at the beginning."
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  :type 'string
  :group 'python
  :safe 'stringp)

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(defcustom python-shell-prompt-output-regexp nil
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  "Regular Expression matching output prompt of python shell.
It should not contain a caret (^) at the beginning."
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  :type 'string
  :group 'python
  :safe 'stringp)

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(defcustom python-shell-prompt-pdb-regexp "[(<]*[Ii]?[Pp]db[>)]+ "
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  "Regular Expression matching pdb input prompt of python shell.
It should not contain a caret (^) at the beginning."
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  :type 'string
  :group 'python
  :safe 'stringp)

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(defcustom python-shell-setup-codes '(python-shell-completion-setup-code
                                      python-ffap-setup-code
                                      python-eldoc-setup-code)
  "List of code run by `python-shell-send-setup-codes'.
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Each variable can contain either a simple string with the code to
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execute or a cons with the form (CODE . DESCRIPTION), where CODE
is a string with the code to execute and DESCRIPTION is the
description of it."
  :type '(repeat symbol)
  :group 'python
  :safe 'listp)

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(defcustom python-shell-compilation-regexp-alist
  `((,(rx line-start (1+ (any " \t")) "File \""
	  (group (1+ (not (any "\"<")))) ; avoid `<stdin>' &c
	  "\", line " (group (1+ digit)))
     1 2)
    (,(rx " in file " (group (1+ not-newline)) " on line "
	  (group (1+ digit)))
     1 2)
    (,(rx line-start "> " (group (1+ (not (any "(\"<"))))
	  "(" (group (1+ digit)) ")" (1+ (not (any "("))) "()")
     1 2))
  "`compilation-error-regexp-alist' for inferior Python."
  :type '(alist string)
  :group 'python)

(defun python-shell-get-process-name (dedicated)
  "Calculate the appropiate process name for inferior Python process.
If DEDICATED is t and the variable `buffer-file-name' is non-nil
returns a string with the form
`python-shell-buffer-name'[variable `buffer-file-name'] else
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returns the value of `python-shell-buffer-name'.  After
calculating the process name adds the buffer name for the process
in the `same-window-buffer-names' list."
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  (let ((process-name
         (if (and dedicated
                  buffer-file-name)
             (format "%s[%s]" python-shell-buffer-name buffer-file-name)
           (format "%s" python-shell-buffer-name))))
    (add-to-list 'same-window-buffer-names (purecopy
                                            (format "*%s*" process-name)))
    process-name))

(defun python-shell-parse-command ()
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  "Calculate the string used to execute the inferior Python process."
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  (format "%s %s" python-shell-interpreter python-shell-interpreter-args))

(defun python-comint-output-filter-function (output)
  "Hook run after content is put into comint buffer.
OUTPUT is a string with the contents of the buffer."
  (ansi-color-filter-apply output))

(defvar inferior-python-mode-current-file nil
  "Current file from which a region was sent.")
(make-variable-buffer-local 'inferior-python-mode-current-file)

(define-derived-mode inferior-python-mode comint-mode "Inferior Python"
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  "Major mode for Python inferior process.
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Runs a Python interpreter as a subprocess of Emacs, with Python
I/O through an Emacs buffer.  Variables
`python-shell-interpreter' and `python-shell-interpreter-args'
controls which Python interpreter is run.  Variables
`python-shell-prompt-regexp',
`python-shell-prompt-output-regexp',
`python-shell-prompt-block-regexp',
`python-shell-completion-setup-code',
`python-shell-completion-string-code', `python-eldoc-setup-code',
`python-eldoc-string-code', `python-ffap-setup-code' and
`python-ffap-string-code' can customize this mode for different
Python interpreters.

You can also add additional setup code to be run at
initialization of the interpreter via `python-shell-setup-codes'
variable.

\(Type \\[describe-mode] in the process buffer for a list of commands.)"
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  (set-syntax-table python-mode-syntax-table)
  (setq mode-line-process '(":%s"))
  (setq comint-prompt-regexp (format "^\\(?:%s\\|%s\\|%s\\)"
                                     python-shell-prompt-regexp
                                     python-shell-prompt-block-regexp
                                     python-shell-prompt-pdb-regexp))
  (make-local-variable 'comint-output-filter-functions)
  (add-hook 'comint-output-filter-functions
            'python-comint-output-filter-function)
  (add-hook 'comint-output-filter-functions
            'python-pdbtrack-comint-output-filter-function)
  (set (make-local-variable 'compilation-error-regexp-alist)
       python-shell-compilation-regexp-alist)
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  (define-key inferior-python-mode-map [remap complete-symbol]
    'completion-at-point)
  (add-hook 'completion-at-point-functions
            'python-shell-completion-complete-at-point nil 'local)
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  (add-to-list (make-local-variable 'comint-dynamic-complete-functions)
               'python-shell-completion-complete-at-point)
  (define-key inferior-python-mode-map (kbd "<tab>")
    'python-shell-completion-complete-or-indent)
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  (compilation-shell-minor-mode 1))

(defun run-python (dedicated cmd)
  "Run an inferior Python process.
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Input and output via buffer named after
`python-shell-buffer-name'.  If there is a process already
running in that buffer, just switch to it.
With argument, allows you to define DEDICATED, so a dedicated
process for the current buffer is open, and define CMD so you can
edit the command used to call the interpreter (default is value
of `python-shell-interpreter' and arguments defined in
`python-shell-interpreter-args').  Runs the hook
`inferior-python-mode-hook' (after the `comint-mode-hook' is
run).
\(Type \\[describe-mode] in the process buffer for a list of commands.)"
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  (interactive
   (if current-prefix-arg
       (list
        (y-or-n-p "Make dedicated process? ")
        (read-string "Run Python: " (python-shell-parse-command)))
     (list nil (python-shell-parse-command))))
  (let* ((proc-name (python-shell-get-process-name dedicated))
         (proc-buffer-name (format "*%s*" proc-name)))
    (when (not (comint-check-proc proc-buffer-name))
      (let ((cmdlist (split-string-and-unquote cmd)))
        (set-buffer
         (apply 'make-comint proc-name (car cmdlist) nil
                (cdr cmdlist)))
        (inferior-python-mode)))
    (pop-to-buffer proc-buffer-name))
  dedicated)

(defun python-shell-get-process ()
  "Get inferior Python process for current buffer and return it."
  (let* ((dedicated-proc-name (python-shell-get-process-name t))
         (dedicated-proc-buffer-name (format "*%s*" dedicated-proc-name))
         (global-proc-name  (python-shell-get-process-name nil))
         (global-proc-buffer-name (format "*%s*" global-proc-name))
         (dedicated-running (comint-check-proc dedicated-proc-buffer-name))
         (global-running (comint-check-proc global-proc-buffer-name)))
    ;; Always prefer dedicated
    (get-buffer-process (or (and dedicated-running dedicated-proc-buffer-name)
                            (and global-running global-proc-buffer-name)))))

(defun python-shell-get-or-create-process ()
  "Get or create an inferior Python process for current buffer and return it."
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  (let* ((old-buffer (current-buffer))
         (dedicated-proc-name (python-shell-get-process-name t))
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         (dedicated-proc-buffer-name (format "*%s*" dedicated-proc-name))
         (global-proc-name  (python-shell-get-process-name nil))
         (global-proc-buffer-name (format "*%s*" global-proc-name))
         (dedicated-running (comint-check-proc dedicated-proc-buffer-name))
         (global-running (comint-check-proc global-proc-buffer-name))
         (current-prefix-arg 4))
    (when (and (not dedicated-running) (not global-running))
      (if (call-interactively 'run-python)
          (setq dedicated-running t)
        (setq global-running t)))
    ;; Always prefer dedicated
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    (switch-to-buffer old-buffer)
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    (get-buffer-process (if dedicated-running
                            dedicated-proc-buffer-name
                          global-proc-buffer-name))))

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(defun python-shell-send-string (string &optional process msg)
  "Send STRING to inferior Python PROCESS.
When MSG is non-nil messages the first line of STRING."
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  (interactive "sPython command: ")
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  (let ((process (or process (python-shell-get-or-create-process)))
        (lines (split-string string "\n" t)))
    (when msg
      (message (format "Sent: %s..." (nth 0 lines))))
    (if (> (length lines) 1)
        (let* ((temp-file-name (make-temp-file "py"))
               (file-name (or (buffer-file-name) temp-file-name)))
          (with-temp-file temp-file-name
            (insert string)
            (delete-trailing-whitespace))
          (python-shell-send-file file-name process temp-file-name))
      (comint-send-string process string)
      (when (or (not (string-match "\n$" string))
                (string-match "\n[ \t].*\n?$" string))
        (comint-send-string process "\n")))))

(defun python-shell-send-string-no-output (string &optional process msg)
  "Send STRING to PROCESS and inhibit output.
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When MSG is non-nil messages the first line of STRING.  Return
the output."
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  (let* ((output-buffer)
         (process (or process (python-shell-get-or-create-process)))
         (comint-preoutput-filter-functions
          (append comint-preoutput-filter-functions
                  '(ansi-color-filter-apply
                    (lambda (string)
                      (setq output-buffer (concat output-buffer string))
                      "")))))
    (python-shell-send-string string process msg)
    (accept-process-output process)
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    ;; Cleanup output prompt regexp
    (when (and (not (string= "" output-buffer))
               (> (length python-shell-prompt-output-regexp) 0))
      (setq output-buffer
            (with-temp-buffer
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              (insert output-buffer)
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              (goto-char (point-min))
              (forward-comment 1)
              (buffer-substring-no-properties
               (or
                (and (looking-at python-shell-prompt-output-regexp)
                     (re-search-forward
                      python-shell-prompt-output-regexp nil t 1))
                (point-marker))
               (point-max)))))
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    (mapconcat
     (lambda (string) string)
     (butlast (split-string output-buffer "\n")) "\n")))
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(defun python-shell-send-region (start end)
  "Send the region delimited by START and END to inferior Python process."
  (interactive "r")
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  (let ((deactivate-mark nil))
    (python-shell-send-string (buffer-substring start end) nil t)))
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(defun python-shell-send-buffer ()
  "Send the entire buffer to inferior Python process."
  (interactive)
  (save-restriction
    (widen)
    (python-shell-send-region (point-min) (point-max))))

(defun python-shell-send-defun (arg)
  "Send the (inner|outer)most def or class to inferior Python process.
When argument ARG is non-nil sends the innermost defun."
  (interactive "P")
  (save-excursion
    (python-shell-send-region (progn
                            (or (if arg
                                    (python-beginning-of-innermost-defun)
                                  (python-beginning-of-defun-function))
                                (progn (beginning-of-line) (point-marker))))
                          (progn
                            (or (python-end-of-defun-function)
                                (progn (end-of-line) (point-marker)))))))

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(defun python-shell-send-file (file-name &optional process temp-file-name)
  "Send FILE-NAME to inferior Python PROCESS.
If TEMP-FILE-NAME is passed then that file is used for processing
instead, while internally the shell will continue to use
FILE-NAME."
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  (interactive "fFile to send: ")
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  (let* ((process (or process (python-shell-get-or-create-process)))
         (temp-file-name (when temp-file-name
                           (expand-file-name temp-file-name)))
         (file-name (or (expand-file-name file-name) temp-file-name)))
    (when (not file-name)
      (error "If FILE-NAME is nil then TEMP-FILE-NAME must be non-nil"))
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    (with-current-buffer (process-buffer process)
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      (setq inferior-python-mode-current-file
            (convert-standard-filename file-name)))
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    (python-shell-send-string
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     (format
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      (concat "__pyfile = open('''%s''');"
              "exec(compile(__pyfile.read(), '''%s''', 'exec'));"
              "__pyfile.close()")
      (or temp-file-name file-name) file-name)
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     process)))
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(defun python-shell-switch-to-shell ()
  "Switch to inferior Python process buffer."
  (interactive)
  (pop-to-buffer (process-buffer (python-shell-get-or-create-process)) t))

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(defun python-shell-send-setup-code ()
  "Send all setup code for shell.
This function takes the list of setup code to send from the
`python-shell-setup-codes' list."
  (let ((msg "Sent %s")
        (process (get-buffer-process (current-buffer))))
    (accept-process-output process 1)
    (dolist (code python-shell-setup-codes)
      (when code
        (when (consp code)
          (setq msg (cdr code)))
        (message (format msg code))
        (python-shell-send-string-no-output
         (symbol-value code) process)))))

(add-hook 'inferior-python-mode-hook
          #'python-shell-send-setup-code)

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;;; Shell completion

(defvar python-shell-completion-setup-code
  "try:
    import readline
except ImportError:
    def __COMPLETER_all_completions(text): []
else:
    import rlcompleter
    readline.set_completer(rlcompleter.Completer().complete)
    def __COMPLETER_all_completions(text):
        import sys
        completions = []
        try:
            i = 0
            while True:
                res = readline.get_completer()(text, i)
                if not res: break
                i += 1
                completions.append(res)
        except NameError:
            pass
        return completions"
  "Code used to setup completion in inferior Python processes.")

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(defvar python-shell-completion-string-code
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  "';'.join(__COMPLETER_all_completions('''%s'''))\n"
  "Python code used to get a string of completions separated by semicolons.")

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(defun python-shell-completion--get-completions (input process)
  "Retrieve available completions for INPUT using PROCESS."
  (with-current-buffer (process-buffer process)
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    (let ((completions (python-shell-send-string-no-output
                        (format python-shell-completion-string-code input)
                        process)))
      (when (> (length completions) 2)
        (split-string completions "^'\\|^\"\\|;\\|'$\\|\"$" t)))))
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(defun python-shell-completion--get-completion (input completions)
  "Get completion for INPUT using COMPLETIONS."
  (let ((completion (when completions
                      (try-completion input completions))))
    (cond ((eq completion t)
           input)
          ((null completion)
           (message "Can't find completion for \"%s\"" input)
           (ding)
           input)
          ((not (string= input completion))
           completion)
          (t
           (message "Making completion list...")
           (with-output-to-temp-buffer "*Python Completions*"
             (display-completion-list
              (all-completions input completions)))
           input))))

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(defun python-shell-completion-complete-at-point ()
  "Perform completion at point in inferior Python process."
  (interactive)
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  (with-syntax-table python-dotty-syntax-table
    (when (and comint-last-prompt-overlay
               (> (point-marker) (overlay-end comint-last-prompt-overlay)))
      (let* ((process (get-buffer-process (current-buffer)))
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             (input (substring-no-properties
                     (or (comint-word (current-word)) "") nil nil)))
        (delete-char (- (length input)))
        (insert
         (python-shell-completion--get-completion
          input (python-shell-completion--get-completions input process)))))))
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(defun python-shell-completion-complete-or-indent ()
  "Complete or indent depending on the context.
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If content before pointer is all whitespace indent.  If not try
to complete."
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  (interactive)
  (if (string-match "^[[:space:]]*$"
                    (buffer-substring (comint-line-beginning-position)
                                      (point-marker)))
      (indent-for-tab-command)
    (comint-dynamic-complete)))


;;; PDB Track integration

(defvar python-pdbtrack-stacktrace-info-regexp
  "> %s(\\([0-9]+\\))\\([?a-zA-Z0-9_<>]+\\)()"
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  "Regular Expression matching stacktrace information.
Used to extract the current line and module beign inspected.  The
regexp should not start with a caret (^) and can contain a string
placeholder (\%s) which is replaced with the filename beign
inspected (so other files in the debugging process are not
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opened)")

(defvar python-pdbtrack-tracking-buffers '()
  "Alist containing elements of form (#<buffer> . #<buffer>).
The car of each element of the alist is the tracking buffer and
the cdr is the tracked buffer.")

(defun python-pdbtrack-get-or-add-tracking-buffers ()
  "Get/Add a tracked buffer for the current buffer.
Internally it uses the `python-pdbtrack-tracking-buffers' alist.
Returns a cons with the form:
 * (#<tracking buffer> . #< tracked buffer>)."
  (or
   (assq (current-buffer) python-pdbtrack-tracking-buffers)
   (let* ((file (with-current-buffer (current-buffer)
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                  inferior-python-mode-current-file))
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          (tracking-buffers
           `(,(current-buffer) .
             ,(or (get-file-buffer file)
                  (find-file-noselect file)))))
     (set-buffer (cdr tracking-buffers))
     (python-mode)
     (set-buffer (car tracking-buffers))
     (setq python-pdbtrack-tracking-buffers
           (cons tracking-buffers python-pdbtrack-tracking-buffers))
     tracking-buffers)))

(defun python-pdbtrack-comint-output-filter-function (output)
  "Move overlay arrow to current pdb line in tracked buffer.
Argument OUTPUT is a string with the output from the comint process."
  (when (not (string= output ""))
    (let ((full-output (ansi-color-filter-apply
                        (buffer-substring comint-last-input-end
                                          (point-max)))))
      (if (string-match python-shell-prompt-pdb-regexp full-output)
          (let* ((tracking-buffers (python-pdbtrack-get-or-add-tracking-buffers))
                 (line-num
                  (save-excursion
                    (string-match
                     (format python-pdbtrack-stacktrace-info-regexp
                             (regexp-quote
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                              inferior-python-mode-current-file))
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                     full-output)
                    (string-to-number (or (match-string-no-properties 1 full-output) ""))))
                 (tracked-buffer-window (get-buffer-window (cdr tracking-buffers)))
                 (tracked-buffer-line-pos))
            (when line-num
              (with-current-buffer (cdr tracking-buffers)
                (set (make-local-variable 'overlay-arrow-string) "=>")
                (set (make-local-variable 'overlay-arrow-position) (make-marker))
                (setq tracked-buffer-line-pos (progn
                                                (goto-char (point-min))
                                                (forward-line (1- line-num))
                                                (point-marker)))
                (when tracked-buffer-window
                  (set-window-point tracked-buffer-window tracked-buffer-line-pos))
                (set-marker overlay-arrow-position tracked-buffer-line-pos)))
            (pop-to-buffer (cdr tracking-buffers))
            (switch-to-buffer-other-window (car tracking-buffers)))
        (let ((tracking-buffers (assq (current-buffer)
                                      python-pdbtrack-tracking-buffers)))
          (when tracking-buffers
            (if inferior-python-mode-current-file
                (with-current-buffer (cdr tracking-buffers)
                  (set-marker overlay-arrow-position nil))
              (kill-buffer (cdr tracking-buffers)))
            (setq python-pdbtrack-tracking-buffers
                  (assq-delete-all (current-buffer)
                                   python-pdbtrack-tracking-buffers)))))))
  output)


;;; Symbol completion

(defun python-completion-complete-at-point ()
  "Complete current symbol at point.
For this to work the best as possible you should call
`python-shell-send-buffer' from time to time so context in
inferior python process is updated properly."
  (interactive)
  (let ((process (python-shell-get-process)))
    (if (not process)
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        (error "Completion needs an inferior Python process running")
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      (with-syntax-table python-dotty-syntax-table
        (let* ((input (substring-no-properties
                       (or (comint-word (current-word)) "") nil nil))
               (completions (python-shell-completion--get-completions
                             input process)))
          (delete-char (- (length input)))
          (insert
           (python-shell-completion--get-completion
            input completions)))))))
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(add-to-list 'debug-ignored-errors "^Completion needs an inferior Python process running.")


;;; Fill paragraph