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;;; icomplete.el --- minibuffer completion incremental feedback
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;; Copyright (C) 1992-1994, 1997, 1999, 2001-2014
;;   Free Software Foundation, Inc.
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;; Author: Ken Manheimer <klm@i.am>
;; Maintainer: Ken Manheimer <klm@i.am>
;; Created: Mar 1993 Ken Manheimer, klm@nist.gov - first release to usenet
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;; Keywords: help, abbrev
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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
;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
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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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;; Enabling this package implements a more fine-grained minibuffer
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;; completion feedback scheme.  Prospective completions are concisely
;; indicated within the minibuffer itself, with each successive
;; keystroke.

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;; See `icomplete-completions' docstring for a description of the
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;; icomplete display format.

;; See the `icomplete-minibuffer-setup-hook' docstring for a means to
;; customize icomplete setup for interoperation with other
;; minibuffer-oriented packages.

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;; To enable/disable icomplete mode, use the `icomplete-mode' function.
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;; Thanks to everyone for their suggestions for refinements of this
;; package.  I particularly have to credit Michael Cook, who
;; implemented an incremental completion style in his 'iswitch'
;; functions that served as a model for icomplete.  Some other
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;; contributors: Noah Friedman (restructuring as minor mode), Colin
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;; Rafferty (lemacs reconciliation), Lars Lindberg, RMS, and others.
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;; klm.
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;;; Code:

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(defgroup icomplete nil
  "Show completions dynamically in minibuffer."
  :prefix "icomplete-"
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  :link '(info-link "(emacs)Icomplete")
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  :group 'minibuffer)

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(defvar icomplete-prospects-length 80)
(make-obsolete-variable
 'icomplete-prospects-length 'icomplete-prospects-height "23.1")

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(defcustom icomplete-separator " | "
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  "String used by Icomplete to separate alternatives in the minibuffer."
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  :type 'string
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  :version "24.4")
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(defcustom icomplete-hide-common-prefix t
  "When non-nil, hide common prefix from completion candidates.
When nil, show candidates in full."
  :type 'boolean
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  :version "24.4")

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(defcustom icomplete-show-matches-on-no-input nil
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  "When non-nil, show completions when first prompting for input."
  :type 'boolean
  :version "24.4")
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(defcustom icomplete-with-completion-tables t
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  "Specialized completion tables with which Icomplete should operate.
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If this is t, Icomplete operates on all tables.
Otherwise this should be a list of the completion tables (e.g.,
`internal-complete-buffer') on which Icomplete should operate."
  ;; Prior to 24.4, not a user-option, default '(internal-complete-buffer).
  :version "24.4"
  :type '(choice (const :tag "All" t)
		 (repeat function)))

(defface icomplete-first-match '((t :weight bold))
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  "Face used by Icomplete for highlighting first match."
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  :version "24.4")
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;;;_* User Customization variables
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(defcustom icomplete-prospects-height
  ;; 20 is an estimated common size for the prompt + minibuffer content, to
  ;; try to guess the number of lines used up by icomplete-prospects-length.
  (+ 1 (/ (+ icomplete-prospects-length 20) (window-width)))
  "Maximum number of lines to use in the minibuffer."
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  :type 'integer
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  :version "23.1")
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(defcustom icomplete-compute-delay .3
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  "Completions-computation stall, used only with large-number completions.
See `icomplete-delay-completions-threshold'."
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  :type 'number)
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(defcustom icomplete-delay-completions-threshold 400
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  "Pending-completions number over which to apply `icomplete-compute-delay'."
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  :type 'integer)
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(defcustom icomplete-max-delay-chars 3
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  "Maximum number of initial chars to apply `icomplete-compute-delay'."
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  :type 'integer)
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(defvar icomplete-in-buffer nil
  "If non-nil, also use Icomplete when completing in non-mini buffers.")

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(defcustom icomplete-minibuffer-setup-hook nil
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  "Icomplete-specific customization of minibuffer setup.
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This hook is run during minibuffer setup if Icomplete is active.
It is intended for use in customizing Icomplete for interoperation
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with other features and packages.  For instance:
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  (add-hook 'icomplete-minibuffer-setup-hook
	     (lambda () (setq-local max-mini-window-height 3)))
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will constrain Emacs to a maximum minibuffer height of 3 lines when
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icompletion is occurring."
  :type 'hook
  :group 'icomplete)


;;;_* Initialization
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;;;_ + Internal Variables
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;;;_  = icomplete-eoinput nil
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(defvar icomplete-overlay (make-overlay (point-min) (point-min) nil t t)
  "Overlay used to display the list of completions.")

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(defun icomplete-pre-command-hook ()
 (let ((non-essential t))
   (icomplete-tidy)))
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(defun icomplete-post-command-hook ()
  (let ((non-essential t)) ;E.g. don't prompt for password!
    (icomplete-exhibit)))
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(defvar icomplete-minibuffer-map
  (let ((map (make-sparse-keymap)))
    (define-key map [?\M-\t] 'minibuffer-force-complete)
    (define-key map [?\C-j]  'minibuffer-force-complete-and-exit)
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    (define-key map [?\C-.]  'icomplete-forward-completions)
    (define-key map [?\C-,]  'icomplete-backward-completions)
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    map)
  "Keymap used by `icomplete-mode' in the minibuffer.")
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(defun icomplete-forward-completions ()
  "Step forward completions by one entry.
Second entry becomes the first and can be selected with
`minibuffer-force-complete-and-exit'."
  (interactive)
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  (let* ((beg (icomplete--field-beg))
         (end (icomplete--field-end))
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         (comps (completion-all-sorted-completions beg end))
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	 (last (last comps)))
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    (when comps
      (setcdr last (cons (car comps) (cdr last)))
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      (completion--cache-all-sorted-completions beg end (cdr comps)))))
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(defun icomplete-backward-completions ()
  "Step backward completions by one entry.
Last entry becomes the first and can be selected with
`minibuffer-force-complete-and-exit'."
  (interactive)
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  (let* ((beg (icomplete--field-beg))
         (end (icomplete--field-end))
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         (comps (completion-all-sorted-completions beg end))
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	 (last-but-one (last comps 2))
	 (last (cdr last-but-one)))
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    (when (consp last)		      ; At least two elements in comps
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      (setcdr last-but-one (cdr last))
      (push (car last) comps)
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      (completion--cache-all-sorted-completions beg end comps))))
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;;;_ > icomplete-mode (&optional prefix)
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;;;###autoload
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(define-minor-mode icomplete-mode
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  "Toggle incremental minibuffer completion (Icomplete mode).
With a prefix argument ARG, enable Icomplete mode if ARG is
positive, and disable it otherwise.  If called from Lisp, enable
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the mode if ARG is omitted or nil.

When this global minor mode is enabled, typing in the minibuffer
continuously displays a list of possible completions that match
the string you have typed.  See `icomplete-completions' for a
description of how prospective completions are displayed.

For more information, see Info node `(emacs)Icomplete'.
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For options you can set, `\\[customize-group] icomplete'.
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You can use the following key bindings to navigate and select
completions:

\\{icomplete-minibuffer-map}"
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  :global t :group 'icomplete
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  (remove-hook 'minibuffer-setup-hook #'icomplete-minibuffer-setup)
  (remove-hook 'completion-in-region-mode-hook #'icomplete--in-region-setup)
  (when icomplete-mode
    (when icomplete-in-buffer
      (add-hook 'completion-in-region-mode-hook #'icomplete--in-region-setup))
    (add-hook 'minibuffer-setup-hook #'icomplete-minibuffer-setup)))

(defun icomplete--completion-table ()
  (if (window-minibuffer-p) minibuffer-completion-table
    (or (nth 2 completion-in-region--data)
	(message "In %S (w=%S): %S"
		 (current-buffer) (selected-window) (window-minibuffer-p)))))
(defun icomplete--completion-predicate ()
  (if (window-minibuffer-p) minibuffer-completion-predicate
    (nth 3 completion-in-region--data)))
(defun icomplete--field-string ()
  (if (window-minibuffer-p) (minibuffer-contents)
    (buffer-substring-no-properties
     (nth 0 completion-in-region--data)
     (nth 1 completion-in-region--data))))
(defun icomplete--field-beg ()
  (if (window-minibuffer-p) (minibuffer-prompt-end)
    (nth 0 completion-in-region--data)))
(defun icomplete--field-end ()
  (if (window-minibuffer-p) (point-max)
    (nth 1 completion-in-region--data)))
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;;;_ > icomplete-simple-completing-p ()
(defun icomplete-simple-completing-p ()
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  "Non-nil if current window is a minibuffer that's doing simple completion.
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Conditions are:
   the selected window is a minibuffer,
   and not in the middle of macro execution,
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   and the completion table is not a function (which would
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       indicate some non-standard, non-simple completion mechanism,
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       like file-name and other custom-func completions),
   and `icomplete-with-completion-tables' doesn't restrict completion."
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  (unless executing-kbd-macro
    (let ((table (icomplete--completion-table)))
      (and table
           (or (not (functionp table))
               (eq icomplete-with-completion-tables t)
               (member table icomplete-with-completion-tables))))))
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;;;_ > icomplete-minibuffer-setup ()
(defun icomplete-minibuffer-setup ()
  "Run in minibuffer on activation to establish incremental completion.
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Usually run by inclusion in `minibuffer-setup-hook'."
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  (when (and icomplete-mode (icomplete-simple-completing-p))
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    (set (make-local-variable 'completion-show-inline-help) nil)
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    (use-local-map (make-composed-keymap icomplete-minibuffer-map
    					 (current-local-map)))
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    (add-hook 'pre-command-hook  #'icomplete-pre-command-hook  nil t)
    (add-hook 'post-command-hook #'icomplete-post-command-hook nil t)
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    (run-hooks 'icomplete-minibuffer-setup-hook)
    (when icomplete-show-matches-on-no-input
      (icomplete-exhibit))))
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(defvar icomplete--in-region-buffer nil)

(defun icomplete--in-region-setup ()
  (when (or (not completion-in-region-mode)
	    (and icomplete--in-region-buffer
		 (not (eq icomplete--in-region-buffer (current-buffer)))))
    (with-current-buffer (or icomplete--in-region-buffer (current-buffer))
      (setq icomplete--in-region-buffer nil)
      (delete-overlay icomplete-overlay)
      (kill-local-variable 'completion-show-inline-help)
      (remove-hook 'pre-command-hook  'icomplete-pre-command-hook  t)
      (remove-hook 'post-command-hook 'icomplete-post-command-hook t)
      (message nil)))
  (when (and completion-in-region-mode
	     icomplete-mode (icomplete-simple-completing-p))
    (setq icomplete--in-region-buffer (current-buffer))
    (set (make-local-variable 'completion-show-inline-help) nil)
    (let ((tem (assq 'completion-in-region-mode
		     minor-mode-overriding-map-alist)))
      (unless (memq icomplete-minibuffer-map (cdr tem))
	(setcdr tem (make-composed-keymap icomplete-minibuffer-map
					  (cdr tem)))))
    (add-hook 'pre-command-hook  'icomplete-pre-command-hook  nil t)
    (add-hook 'post-command-hook 'icomplete-post-command-hook nil t)))

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;;;_* Completion

;;;_ > icomplete-tidy ()
(defun icomplete-tidy ()
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  "Remove completions display (if any) prior to new user input.
Should be run in on the minibuffer `pre-command-hook'.
See `icomplete-mode' and `minibuffer-setup-hook'."
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  (delete-overlay icomplete-overlay))
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;;;_ > icomplete-exhibit ()
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(defun icomplete-exhibit ()
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  "Insert Icomplete completions display.
Should be run via minibuffer `post-command-hook'.
See `icomplete-mode' and `minibuffer-setup-hook'."
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  (when (and icomplete-mode
             (icomplete-simple-completing-p)) ;Shouldn't be necessary.
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    (save-excursion
      (goto-char (point-max))
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                                        ; Insert the match-status information:
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      (if (and (or icomplete-show-matches-on-no-input
                   (> (icomplete--field-end) (icomplete--field-beg)))
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               (or
                ;; Don't bother with delay after certain number of chars:
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                (> (- (point) (icomplete--field-beg))
                   icomplete-max-delay-chars)
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                ;; Don't delay if the completions are known.
                completion-all-sorted-completions
                ;; Don't delay if alternatives number is small enough:
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                (and (sequencep (icomplete--completion-table))
                     (< (length (icomplete--completion-table))
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                        icomplete-delay-completions-threshold))
                ;; Delay - give some grace time for next keystroke, before
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		;; embarking on computing completions:
		(sit-for icomplete-compute-delay)))
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	  (let* ((field-string (icomplete--field-string))
                 (text (while-no-input
                         (icomplete-completions
                          field-string
                          (icomplete--completion-table)
                          (icomplete--completion-predicate)
                          (if (window-minibuffer-p)
                              (not minibuffer-completion-confirm)))))
                 (buffer-undo-list t)
                 deactivate-mark)
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	    ;; Do nothing if while-no-input was aborted.
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            (when (stringp text)
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              (move-overlay icomplete-overlay (point) (point) (current-buffer))
              ;; The current C cursor code doesn't know to use the overlay's
              ;; marker's stickiness to figure out whether to place the cursor
              ;; before or after the string, so let's spoon-feed it the pos.
              (put-text-property 0 1 'cursor t text)
              (overlay-put icomplete-overlay 'after-string text)))))))
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;;;_ > icomplete-completions (name candidates predicate require-match)
(defun icomplete-completions (name candidates predicate require-match)
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  "Identify prospective candidates for minibuffer completion.

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The display is updated with each minibuffer keystroke during
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minibuffer completion.

Prospective completion suffixes (if any) are displayed, bracketed by
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one of (), [], or {} pairs.  The choice of brackets is as follows:
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  (...) - a single prospect is identified and matching is enforced,
  [...] - a single prospect is identified but matching is optional, or
  {...} - multiple prospects, separated by commas, are indicated, and
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          further input is required to distinguish a single one.
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If there are multiple possibilities, `icomplete-separator' separates them.

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The displays for unambiguous matches have ` [Matched]' appended
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\(whether complete or not), or ` [No matches]', if no eligible
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matches exist."
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  (let* ((minibuffer-completion-table candidates)
	 (minibuffer-completion-predicate predicate)
	 (md (completion--field-metadata (icomplete--field-beg)))
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	 (comps (completion-all-sorted-completions
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                 (icomplete--field-beg) (icomplete--field-end)))
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         (last (if (consp comps) (last comps)))
         (base-size (cdr last))
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         (open-bracket (if require-match "(" "["))
         (close-bracket (if require-match ")" "]")))
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    ;; `concat'/`mapconcat' is the slow part.
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    (if (not (consp comps))
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	(progn ;;(debug (format "Candidates=%S field=%S" candidates name))
	       (format " %sNo matches%s" open-bracket close-bracket))
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      (if last (setcdr last nil))
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      (let* ((most-try
              (if (and base-size (> base-size 0))
                  (completion-try-completion
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                   name candidates predicate (length name) md)
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                ;; If the `comps' are 0-based, the result should be
                ;; the same with `comps'.
                (completion-try-completion
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                 name comps nil (length name) md)))
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	     (most (if (consp most-try) (car most-try)
                     (if most-try (car comps) "")))
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             ;; Compare name and most, so we can determine if name is
             ;; a prefix of most, or something else.
	     (compare (compare-strings name nil nil
				       most nil nil completion-ignore-case))
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	     (ellipsis (if (char-displayable-p ?) "…" "..."))
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	     (determ (unless (or (eq t compare) (eq t most-try)
				 (= (setq compare (1- (abs compare)))
				    (length most)))
		       (concat open-bracket
			       (cond
				((= compare (length name))
                                 ;; Typical case: name is a prefix.
				 (substring most compare))
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                                ;; Don't bother truncating if it doesn't gain
                                ;; us at least 2 columns.
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				((< compare (+ 2 (string-width ellipsis))) most)
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				(t (concat ellipsis (substring most compare))))
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			       close-bracket)))
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	     ;;"-prospects" - more than one candidate
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	     (prospects-len (+ (string-width
				(or determ (concat open-bracket close-bracket)))
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			       (string-width icomplete-separator)
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			       (+ 2 (string-width ellipsis)) ;; take {…} into account
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			       (string-width (buffer-string))))
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             (prospects-max
              ;; Max total length to use, including the minibuffer content.
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              (* (+ icomplete-prospects-height
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                    ;; If the minibuffer content already uses up more than
                    ;; one line, increase the allowable space accordingly.
                    (/ prospects-len (window-width)))
                 (window-width)))
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             ;; Find the common prefix among `comps'.
             ;; We can't use the optimization below because its assumptions
             ;; aren't always true, e.g. when completion-cycling (bug#10850):
             ;; (if (eq t (compare-strings (car comps) nil (length most)
             ;; 			 most nil nil completion-ignore-case))
             ;;     ;; Common case.
             ;;     (length most)
             ;; Else, use try-completion.
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	     (prefix (when icomplete-hide-common-prefix
		       (try-completion "" comps)))
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             (prefix-len
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	      (and (stringp prefix)
                   ;; Only hide the prefix if the corresponding info
                   ;; is already displayed via `most'.
                   (string-prefix-p prefix most t)
                   (length prefix))) ;;)
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	     prospects comp limit)
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	(if (or (eq most-try t) (not (consp (cdr comps))))
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	    (setq prospects nil)
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	  (when (member name comps)
	    ;; NAME is complete but not unique.  This scenario poses
	    ;; following UI issues:
	    ;;
	    ;; - When `icomplete-hide-common-prefix' is non-nil, NAME
	    ;;   is stripped empty.  This would make the entry
	    ;;   inconspicuous.
	    ;;
	    ;; - Due to sorting of completions, NAME may not be the
	    ;;   first of the prospects and could be hidden deep in
	    ;;   the displayed string.
	    ;;
	    ;; - Because of `icomplete-prospects-height' , NAME may
	    ;;   not even be displayed to the user.
	    ;;
	    ;; To circumvent all the above problems, provide a visual
	    ;; cue to the user via an "empty string" in the try
	    ;; completion field.
	    (setq determ (concat open-bracket "" close-bracket)))
	  ;; Compute prospects for display.
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	  (while (and comps (not limit))
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	    (setq comp
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		  (if prefix-len (substring (car comps) prefix-len) (car comps))
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		  comps (cdr comps))
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	    (setq prospects-len
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                           (+ (string-width comp)
			      (string-width icomplete-separator)
			      prospects-len))
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		     (if (< prospects-len prospects-max)
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			 (push comp prospects)
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	      (setq limit t))))
	(setq prospects (nreverse prospects))
	;; Decorate first of the prospects.
	(when prospects
	  (let ((first (copy-sequence (pop prospects))))
	    (put-text-property 0 (length first)
			       'face 'icomplete-first-match first)
	    (push first prospects)))
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        ;; Restore the base-size info, since completion-all-sorted-completions
        ;; is cached.
        (if last (setcdr last base-size))
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	(if prospects
	    (concat determ
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		    "{"
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		    (mapconcat 'identity prospects icomplete-separator)
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		    (and limit (concat icomplete-separator "…"))
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		    "}")
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	  (concat determ " [Matched]"))))))
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;;;_* Provide
(provide 'icomplete)

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;;_* Local emacs vars.
;;Local variables:
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