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;;; smart-tab.el --- Intelligent tab completion and indentation.
;; This file is NOT part of GNU Emacs.
;; Copyright (C) 2009-2011 John SJ Anderson,
;; Sebastien Rocca Serra,
;; Daniel Hackney
;; Author: John SJ Anderson <>,
;; Sebastien Rocca Serra <>,
;; Daniel Hackney <>
;; Maintainer: John SJ Anderson <>
;; Keywords: extensions
;; Created: 2009-05-24
;; URL:
;; Version: 0.3
;; 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, 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 this program. If not, see <>.
;;; Commentary:
;; To install, put this file along your Emacs-Lisp `load-path' and add
;; the following into your ~/.emacs startup file or set
;; `global-smart-tab-mode' to non-nil with customize:
;; (require 'smart-tab)
;; (global-smart-tab-mode 1)
;; Try to 'do the smart thing' when tab is pressed. `smart-tab'
;; attempts to expand the text before the point or indent the current
;; line or selection.
;; See <>. There are a
;; number of available customizations on that page.
;; Features that might be required by this library:
;; `easy-mmmode'
;;; Change Log:
;;; Code:
(require 'easy-mmode)
;; Forward declaration, does not define variable
(defvar auto-complete-mode))
(defgroup smart-tab nil
"Options for `smart-tab-mode'."
:group 'tools)
(defvar smart-tab-debug nil
"Turn on for logging about which `smart-tab' function ends up being called.")
(defcustom smart-tab-using-hippie-expand nil
"Use `hippie-expand' to expand text.
Use either `hippie-expand' or `dabbrev-expand' for expanding text
when we don't have to indent."
:type '(choice
(const :tag "hippie-expand" t)
(const :tag "dabbrev-expand" nil))
:group 'smart-tab)
(defcustom smart-tab-completion-functions-alist
'((emacs-lisp-mode . lisp-complete-symbol)
(text-mode . dabbrev-completion))
"A-list of major modes in which to use a mode specific completion function.
If current major mode is not found in this alist, fall back to
`hippie-expand' or `dabbrev-expand', depending on the value of
:type '(alist :key-type (symbol :tag "Major mode")
:value-type (function :tag "Completion function to use in this mode"))
:group 'smart-tab)
(defcustom smart-tab-disabled-major-modes '(org-mode term-mode eshell-mode)
"List of major modes that should not use `smart-tab'."
:type 'sexp
:group 'smart-tab)
(put 'smart-tab-funcall 'lisp-indent-function 0)
(put 'smart-tab-funcall 'edebug-form-spec '(body))
(defmacro smart-tab-funcall (function &rest args)
"If FUNCTION is `fboundp' call it with ARGS."
`(let ((function ,function))
(if (fboundp function)
(apply function ,@args nil))))
(defun smart-tab-call-completion-function ()
"Get a completion function according to current major mode."
(if smart-tab-debug
(message "complete"))
(let ((completion-function
(cdr (assq major-mode smart-tab-completion-functions-alist))))
(if (null completion-function)
(if (and (not (minibufferp))
(memq 'auto-complete-mode minor-mode-list)
(boundp' auto-complete-mode)
(smart-tab-funcall 'ac-start :force-init t)
(if smart-tab-using-hippie-expand
(hippie-expand nil)
(dabbrev-expand nil)))
(funcall completion-function))))
(defun smart-tab-must-expand (&optional prefix)
"If PREFIX is \\[universal-argument] or the mark is active, do not expand.
Otherwise, uses the user's preferred expansion function to expand
the text at point."
(unless (or (consp prefix)
(looking-at "\\_>")))
(defun smart-tab-default ()
"Indent region if mark is active, or current line otherwise."
(if smart-tab-debug
(message "default"))
(if (use-region-p)
(indent-region (region-beginning)
(defun smart-tab (&optional prefix)
"Try to 'do the smart thing' when tab is pressed.
`smart-tab' attempts to expand the text before the point or
indent the current line or selection.
In a regular buffer, `smart-tab' will attempt to expand with
either `hippie-expand' or `dabbrev-expand', depending on the
value of `smart-tab-using-hippie-expand'. Alternatively, if
`auto-complete-mode' is enabled in the current buffer,
`auto-complete' will be used to attempt expansion. If the mark is
active, or PREFIX is \\[universal-argument], then `smart-tab'
will indent the region or the current line (if the mark is not
(interactive "P")
(if (smart-tab-must-expand prefix)
(defun smart-tab-mode-on ()
"Turn on `smart-tab-mode'."
(smart-tab-mode 1))
(defun smart-tab-mode-off ()
"Turn off `smart-tab-mode'."
(smart-tab-mode -1))
(define-minor-mode smart-tab-mode
"Enable `smart-tab' to be used in place of tab.
With no argument, this command toggles the mode.
Non-null prefix argument turns on the mode.
Null prefix argument turns off the mode."
:lighter " Smrt"
:group 'smart-tab
:require 'smart-tab
:keymap '(("\t" . smart-tab)
([(tab)] . smart-tab))
(if smart-tab-mode
;; Don't start `smart-tab-mode' when in the minibuffer or a read-only
;; buffer.
(when (or (minibufferp)
(member major-mode smart-tab-disabled-major-modes))
(define-globalized-minor-mode global-smart-tab-mode
:group 'smart-tab)
(provide 'smart-tab)
;;; smart-tab.el ends here