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540 lines
22 KiB
EmacsLisp
540 lines
22 KiB
EmacsLisp
;;; electric.el --- window maker and Command loop for `electric' modes
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;; Copyright (C) 1985-1986, 1995, 2001-2017 Free Software Foundation,
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;; Inc.
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;; Author: K. Shane Hartman
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: extensions
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; "Electric" has been used in Emacs to refer to different things.
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;; Among them:
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;;
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;; - electric modes and buffers: modes that typically pop-up in a modal kind of
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;; way a transient buffer that automatically disappears as soon as the user
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;; is done with it.
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;;
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;; - electric keys: self inserting keys which additionally perform some side
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;; operation which happens to be often convenient at that time. Examples of
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;; such side operations are: reindenting code, inserting a newline,
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;; ... auto-fill-mode and abbrev-mode can be considered as built-in forms of
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;; electric key behavior.
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;;; Code:
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;; This loop is the guts for non-standard modes which retain control
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;; until some event occurs. It is a `do-forever', the only way out is
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;; to throw. It assumes that you have set up the keymap, window, and
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;; everything else: all it does is read commands and execute them -
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;; providing error messages should one occur (if there is no loop
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;; function - which see). The required argument is a tag which should
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;; expect a value of nil if the user decides to punt. The second
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;; argument is the prompt to be used: if nil, use "->", if 'noprompt,
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;; don't use a prompt, if a string, use that string as prompt, and if
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;; a function of no variable, it will be evaluated in every iteration
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;; of the loop and its return value, which can be nil, 'noprompt or a
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;; string, will be used as prompt. Given third argument non-nil, it
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;; INHIBITS quitting unless the user types C-g at toplevel. This is
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;; so user can do things like C-u C-g and not get thrown out. Fourth
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;; argument, if non-nil, should be a function of two arguments which
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;; is called after every command is executed. The fifth argument, if
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;; provided, is the state variable for the function. If the
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;; loop-function gets an error, the loop will abort WITHOUT throwing
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;; (moral: use unwind-protect around call to this function for any
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;; critical stuff). The second argument for the loop function is the
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;; conditions for any error that occurred or nil if none.
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(defun Electric-command-loop (return-tag
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&optional prompt inhibit-quitting
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loop-function loop-state)
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(let (cmd
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(err nil)
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(inhibit-quit inhibit-quitting)
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(prompt-string prompt))
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(while t
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(if (functionp prompt)
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(setq prompt-string (funcall prompt)))
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(if (not (stringp prompt-string))
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(setq prompt-string (unless (eq prompt-string 'noprompt) "->")))
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(setq cmd (read-key-sequence prompt-string))
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(setq last-command-event (aref cmd (1- (length cmd)))
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this-command (key-binding cmd t)
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cmd this-command)
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(if (or (prog1 quit-flag (setq quit-flag nil))
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(eq last-input-event ?\C-g))
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(progn (setq unread-command-events nil
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prefix-arg nil)
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;; If it wasn't canceling a prefix character, then quit.
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(if (or (= (length (this-command-keys)) 1)
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(not inhibit-quit)) ; safety
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(progn (ding)
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(message "Quit")
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(throw return-tag nil))
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(setq cmd nil))))
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(setq current-prefix-arg prefix-arg)
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(if cmd
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(condition-case conditions
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(progn (command-execute cmd)
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(setq last-command this-command)
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(if (or (prog1 quit-flag (setq quit-flag nil))
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(eq last-input-event ?\C-g))
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(progn (setq unread-command-events nil)
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(if (not inhibit-quit)
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(progn (ding)
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(message "Quit")
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(throw return-tag nil))
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(ding)))))
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(buffer-read-only (if loop-function
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(setq err conditions)
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(ding)
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(message "Buffer is read-only")
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(sit-for 2)))
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(beginning-of-buffer (if loop-function
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(setq err conditions)
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(ding)
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(message "Beginning of Buffer")
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(sit-for 2)))
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(end-of-buffer (if loop-function
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(setq err conditions)
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(ding)
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(message "End of Buffer")
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(sit-for 2)))
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(error (if loop-function
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(setq err conditions)
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(ding)
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(message "Error: %s"
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(if (eq (car conditions) 'error)
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(car (cdr conditions))
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(prin1-to-string conditions)))
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(sit-for 2))))
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(ding))
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(if loop-function (funcall loop-function loop-state err))))
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(ding)
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(throw return-tag nil))
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;; This function is like pop-to-buffer, sort of.
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;; The algorithm is
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;; If there is a window displaying buffer
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;; Select it
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;; Else if there is only one window
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;; Split it, selecting the window on the bottom with height being
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;; the lesser of max-height (if non-nil) and the number of lines in
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;; the buffer to be displayed subject to window-min-height constraint.
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;; Else
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;; Switch to buffer in the current window.
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;;
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;; Then if max-height is nil, and not all of the lines in the buffer
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;; are displayed, grab the whole frame.
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;;
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;; Returns selected window on buffer positioned at point-min.
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(defun Electric-pop-up-window (buffer &optional max-height)
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(let* ((win (or (get-buffer-window buffer) (selected-window)))
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(buf (get-buffer buffer))
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(one-window (one-window-p t))
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(pop-up-windows t)
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(pop-up-frames nil))
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(if (not buf)
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(error "Buffer %s does not exist" buffer)
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(cond ((and (eq (window-buffer win) buf))
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(select-window win))
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(one-window
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(pop-to-buffer buffer)
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(setq win (selected-window)))
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(t
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(switch-to-buffer buf)))
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;; Don't shrink the window, but expand it if necessary.
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(goto-char (point-min))
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(unless (= (point-max) (window-end win t))
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;; This call is executed even if the window existed before, was
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;; reused, ... contradicting a claim in the comment before this
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;; function.
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(fit-window-to-buffer win max-height nil nil nil t))
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win)))
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;;; Electric keys.
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(defgroup electricity ()
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"Electric behavior for self inserting keys."
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:group 'editing)
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(defun electric--after-char-pos ()
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"Return the position after the char we just inserted.
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Returns nil when we can't find this char."
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(let ((pos (point)))
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(when (or (eq (char-before) last-command-event) ;; Sanity check.
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(save-excursion
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(or (progn (skip-chars-backward " \t")
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(setq pos (point))
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(eq (char-before) last-command-event))
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(progn (skip-chars-backward " \n\t")
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(setq pos (point))
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(eq (char-before) last-command-event)))))
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pos)))
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(defun electric--sort-post-self-insertion-hook ()
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"Ensure order of electric functions in `post-self-insertion-hook'.
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Hooks in this variable interact in non-trivial ways, so a
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relative order must be maintained within it."
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(setq-default post-self-insert-hook
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(sort (default-value 'post-self-insert-hook)
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#'(lambda (fn1 fn2)
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(< (or (get fn1 'priority) 0)
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(or (get fn2 'priority) 0))))))
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;;; Electric indentation.
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;; Autoloading variables is generally undesirable, but major modes
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;; should usually set this variable by adding elements to the default
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;; value, which only works well if the variable is preloaded.
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;;;###autoload
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(defvar electric-indent-chars '(?\n)
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"Characters that should cause automatic reindentation.")
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(defvar electric-indent-functions nil
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"Special hook run to decide whether to auto-indent.
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Each function is called with one argument (the inserted char), with
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point right after that char, and it should return t to cause indentation,
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`no-indent' to prevent indentation or nil to let other functions decide.")
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(defvar-local electric-indent-inhibit nil
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"If non-nil, reindentation is not appropriate for this buffer.
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This should be set by major modes such as `python-mode' since
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Python does not lend itself to fully automatic indentation.")
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(defvar electric-indent-functions-without-reindent
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'(indent-relative indent-to-left-margin indent-relative-maybe
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py-indent-line coffee-indent-line org-indent-line yaml-indent-line
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haskell-indentation-indent-line haskell-indent-cycle haskell-simple-indent
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yaml-indent-line)
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"List of indent functions that can't reindent.
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If `line-indent-function' is one of those, then `electric-indent-mode' will
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not try to reindent lines. It is normally better to make the major
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mode set `electric-indent-inhibit', but this can be used as a workaround.")
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(defun electric-indent-post-self-insert-function ()
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"Function that `electric-indent-mode' adds to `post-self-insert-hook'.
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This indents if the hook `electric-indent-functions' returns non-nil,
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or if a member of `electric-indent-chars' was typed; but not in a string
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or comment."
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;; FIXME: This reindents the current line, but what we really want instead is
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;; to reindent the whole affected text. That's the current line for simple
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;; cases, but not all cases. We do take care of the newline case in an
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;; ad-hoc fashion, but there are still missing cases such as the case of
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;; electric-pair-mode wrapping a region with a pair of parens.
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;; There might be a way to get it working by analyzing buffer-undo-list, but
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;; it looks challenging.
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(let (pos)
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(when (and
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electric-indent-mode
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;; Don't reindent while inserting spaces at beginning of line.
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(or (not (memq last-command-event '(?\s ?\t)))
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(save-excursion (skip-chars-backward " \t") (not (bolp))))
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(setq pos (electric--after-char-pos))
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(save-excursion
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(goto-char pos)
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(let ((act (or (run-hook-with-args-until-success
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'electric-indent-functions
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last-command-event)
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(memq last-command-event electric-indent-chars))))
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(not
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(or (memq act '(nil no-indent))
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;; In a string or comment.
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(unless (eq act 'do-indent) (nth 8 (syntax-ppss))))))))
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;; For newline, we want to reindent both lines and basically behave like
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;; reindent-then-newline-and-indent (whose code we hence copied).
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(let ((at-newline (<= pos (line-beginning-position))))
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(when at-newline
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(let ((before (copy-marker (1- pos) t)))
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(save-excursion
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(unless (or (memq indent-line-function
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electric-indent-functions-without-reindent)
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electric-indent-inhibit)
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;; Don't reindent the previous line if the indentation function
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;; is not a real one.
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(goto-char before)
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(indent-according-to-mode))
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;; We are at EOL before the call to indent-according-to-mode, and
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;; after it we usually are as well, but not always. We tried to
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;; address it with `save-excursion' but that uses a normal marker
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;; whereas we need `move after insertion', so we do the
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;; save/restore by hand.
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(goto-char before)
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(when (eolp)
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;; Remove the trailing whitespace after indentation because
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;; indentation may (re)introduce the whitespace.
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(delete-horizontal-space t)))))
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(unless (and electric-indent-inhibit
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(not at-newline))
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(indent-according-to-mode))))))
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(put 'electric-indent-post-self-insert-function 'priority 60)
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(defun electric-indent-just-newline (arg)
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"Insert just a newline, without any auto-indentation."
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(interactive "*P")
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(let ((electric-indent-mode nil))
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(newline arg 'interactive)))
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;;;###autoload
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(define-key global-map "\C-j" 'electric-newline-and-maybe-indent)
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;;;###autoload
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(defun electric-newline-and-maybe-indent ()
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"Insert a newline.
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If `electric-indent-mode' is enabled, that's that, but if it
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is *disabled* then additionally indent according to major mode.
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Indentation is done using the value of `indent-line-function'.
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In programming language modes, this is the same as TAB.
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In some text modes, where TAB inserts a tab, this command indents to the
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column specified by the function `current-left-margin'."
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(interactive "*")
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(if electric-indent-mode
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(electric-indent-just-newline nil)
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(newline-and-indent)))
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;;;###autoload
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(define-minor-mode electric-indent-mode
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"Toggle on-the-fly reindentation (Electric Indent mode).
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With a prefix argument ARG, enable Electric Indent mode if ARG is
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positive, and disable it otherwise. If called from Lisp, enable
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the mode if ARG is omitted or nil.
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When enabled, this reindents whenever the hook `electric-indent-functions'
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returns non-nil, or if you insert a character from `electric-indent-chars'.
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This is a global minor mode. To toggle the mode in a single buffer,
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use `electric-indent-local-mode'."
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:global t :group 'electricity
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:initialize 'custom-initialize-delay
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:init-value t
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(if (not electric-indent-mode)
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(unless (catch 'found
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(dolist (buf (buffer-list))
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(with-current-buffer buf
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(if electric-indent-mode (throw 'found t)))))
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(remove-hook 'post-self-insert-hook
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#'electric-indent-post-self-insert-function))
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(add-hook 'post-self-insert-hook
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#'electric-indent-post-self-insert-function)
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(electric--sort-post-self-insertion-hook)))
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;;;###autoload
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(define-minor-mode electric-indent-local-mode
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"Toggle `electric-indent-mode' only in this buffer."
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:variable (buffer-local-value 'electric-indent-mode (current-buffer))
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(cond
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((eq electric-indent-mode (default-value 'electric-indent-mode))
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(kill-local-variable 'electric-indent-mode))
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((not (default-value 'electric-indent-mode))
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;; Locally enabled, but globally disabled.
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(electric-indent-mode 1) ; Setup the hooks.
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(setq-default electric-indent-mode nil) ; But keep it globally disabled.
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)))
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;;; Electric newlines after/before/around some chars.
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(defvar electric-layout-rules nil
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"List of rules saying where to automatically insert newlines.
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Each rule has the form (CHAR . WHERE) where CHAR is the char that
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was just inserted and WHERE specifies where to insert newlines
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and can be: nil, `before', `after', `around', `after-stay', or a
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function of no arguments that returns one of those symbols.
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The symbols specify where in relation to CHAR the newline
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character(s) should be inserted. `after-stay' means insert a
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newline after CHAR but stay in the same place.")
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(defun electric-layout-post-self-insert-function ()
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(let* ((rule (cdr (assq last-command-event electric-layout-rules)))
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pos)
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(when (and rule
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(setq pos (electric--after-char-pos))
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;; Not in a string or comment.
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(not (nth 8 (save-excursion (syntax-ppss pos)))))
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(let ((end (point-marker))
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(sym (if (functionp rule) (funcall rule) rule)))
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(set-marker-insertion-type end (not (eq sym 'after-stay)))
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(goto-char pos)
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(pcase sym
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;; FIXME: we used `newline' down here which called
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;; self-insert-command and ran post-self-insert-hook recursively.
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;; It happened to make electric-indent-mode work automatically with
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;; electric-layout-mode (at the cost of re-indenting lines
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;; multiple times), but I'm not sure it's what we want.
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;;
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;; FIXME: check eolp before inserting \n?
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(`before (goto-char (1- pos)) (skip-chars-backward " \t")
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(unless (bolp) (insert "\n")))
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(`after (insert "\n"))
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(`after-stay (save-excursion
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(let ((electric-layout-rules nil))
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(newline 1 t))))
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(`around (save-excursion
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(goto-char (1- pos)) (skip-chars-backward " \t")
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(unless (bolp) (insert "\n")))
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(insert "\n"))) ; FIXME: check eolp before inserting \n?
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(goto-char end)))))
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(put 'electric-layout-post-self-insert-function 'priority 40)
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;;;###autoload
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(define-minor-mode electric-layout-mode
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"Automatically insert newlines around some chars.
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With a prefix argument ARG, enable Electric Layout mode if ARG is
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positive, and disable it otherwise. If called from Lisp, enable
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the mode if ARG is omitted or nil.
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The variable `electric-layout-rules' says when and how to insert newlines."
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:global t :group 'electricity
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(cond (electric-layout-mode
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(add-hook 'post-self-insert-hook
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#'electric-layout-post-self-insert-function)
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(electric--sort-post-self-insertion-hook))
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(t
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(remove-hook 'post-self-insert-hook
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#'electric-layout-post-self-insert-function))))
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;;; Electric quoting.
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(defcustom electric-quote-comment t
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"Non-nil means to use electric quoting in program comments."
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:version "25.1"
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:type 'boolean :safe 'booleanp :group 'electricity)
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(defcustom electric-quote-string nil
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"Non-nil means to use electric quoting in program strings."
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:version "25.1"
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:type 'boolean :safe 'booleanp :group 'electricity)
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(defcustom electric-quote-chars '(?‘ ?’ ?“ ?”)
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"Curved quote characters for `electric-quote-mode'.
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This list's members correspond to left single quote, right single
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quote, left double quote, and right double quote, respectively."
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:version "26.1"
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:type '(list character character character character)
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:safe #'(lambda (x)
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(pcase x
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(`(,(pred characterp) ,(pred characterp)
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,(pred characterp) ,(pred characterp))
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t)))
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:group 'electricity)
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(defcustom electric-quote-paragraph t
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"Non-nil means to use electric quoting in text paragraphs."
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:version "25.1"
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:type 'boolean :safe 'booleanp :group 'electricity)
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(defun electric-quote-post-self-insert-function ()
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"Function that `electric-quote-mode' adds to `post-self-insert-hook'.
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This requotes when a quoting key is typed."
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(when (and electric-quote-mode
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(memq last-command-event '(?\' ?\`)))
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(let ((start
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(if (and comment-start comment-use-syntax)
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(when (or electric-quote-comment electric-quote-string)
|
||
(let* ((syntax (syntax-ppss))
|
||
(beg (nth 8 syntax)))
|
||
(and beg
|
||
(or (and electric-quote-comment (nth 4 syntax))
|
||
(and electric-quote-string (nth 3 syntax)))
|
||
;; Do not requote a quote that starts or ends
|
||
;; a comment or string.
|
||
(eq beg (nth 8 (save-excursion
|
||
(syntax-ppss (1- (point)))))))))
|
||
(and electric-quote-paragraph
|
||
(derived-mode-p 'text-mode)
|
||
(or (eq last-command-event ?\`)
|
||
(save-excursion (backward-paragraph) (point)))))))
|
||
(pcase electric-quote-chars
|
||
(`(,q< ,q> ,q<< ,q>>)
|
||
(when start
|
||
(save-excursion
|
||
(if (eq last-command-event ?\`)
|
||
(cond ((search-backward (string q< ?`) (- (point) 2) t)
|
||
(replace-match (string q<<))
|
||
(when (and electric-pair-mode
|
||
(eq (cdr-safe
|
||
(assq q< electric-pair-text-pairs))
|
||
(char-after)))
|
||
(delete-char 1))
|
||
(setq last-command-event q<<))
|
||
((search-backward "`" (1- (point)) t)
|
||
(replace-match (string q<))
|
||
(setq last-command-event q<)))
|
||
(cond ((search-backward (string q> ?') (- (point) 2) t)
|
||
(replace-match (string q>>))
|
||
(setq last-command-event q>>))
|
||
((search-backward "'" (1- (point)) t)
|
||
(replace-match (string q>))
|
||
(setq last-command-event q>)))))))))))
|
||
|
||
(put 'electric-quote-post-self-insert-function 'priority 10)
|
||
|
||
;;;###autoload
|
||
(define-minor-mode electric-quote-mode
|
||
"Toggle on-the-fly requoting (Electric Quote mode).
|
||
With a prefix argument ARG, enable Electric Quote mode if
|
||
ARG is positive, and disable it otherwise. If called from Lisp,
|
||
enable the mode if ARG is omitted or nil.
|
||
|
||
When enabled, as you type this replaces \\=` with ‘, \\=' with ’,
|
||
\\=`\\=` with “, and \\='\\=' with ”. This occurs only in comments, strings,
|
||
and text paragraphs, and these are selectively controlled with
|
||
`electric-quote-comment', `electric-quote-string', and
|
||
`electric-quote-paragraph'.
|
||
|
||
Customize `electric-quote-chars' to use characters other than the
|
||
ones listed here.
|
||
|
||
This is a global minor mode. To toggle the mode in a single buffer,
|
||
use `electric-quote-local-mode'."
|
||
:global t :group 'electricity
|
||
:initialize 'custom-initialize-delay
|
||
:init-value nil
|
||
(if (not electric-quote-mode)
|
||
(unless (catch 'found
|
||
(dolist (buf (buffer-list))
|
||
(with-current-buffer buf
|
||
(if electric-quote-mode (throw 'found t)))))
|
||
(remove-hook 'post-self-insert-hook
|
||
#'electric-quote-post-self-insert-function))
|
||
(add-hook 'post-self-insert-hook
|
||
#'electric-quote-post-self-insert-function)
|
||
(electric--sort-post-self-insertion-hook)))
|
||
|
||
;;;###autoload
|
||
(define-minor-mode electric-quote-local-mode
|
||
"Toggle `electric-quote-mode' only in this buffer."
|
||
:variable (buffer-local-value 'electric-quote-mode (current-buffer))
|
||
(cond
|
||
((eq electric-quote-mode (default-value 'electric-quote-mode))
|
||
(kill-local-variable 'electric-quote-mode))
|
||
((not (default-value 'electric-quote-mode))
|
||
;; Locally enabled, but globally disabled.
|
||
(electric-quote-mode 1) ; Setup the hooks.
|
||
(setq-default electric-quote-mode nil) ; But keep it globally disabled.
|
||
)))
|
||
|
||
(provide 'electric)
|
||
|
||
;;; electric.el ends here
|