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- ;;;_. icomplete.el - minibuffer completion incremental feedback
-
- ;; Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
-
- ;; Author: Ken Manheimer <klm@python.org>
- ;; Maintainer: Ken Manheimer <klm@python.org>
- ;; Version: $Id: icomplete.el,v 4.10 1997/05/30 22:01:13 klm Exp $
- ;; Created: Mar 1993 klm@nist.gov - first release to usenet
- ;; Keywords: help, abbrev
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;; This file is also part of GNU XEmacs.
- ;; Hacked for GNU XEmacs: David Hughes 7th September 1995.
- ;; Icomplete keybindings display originally by Steve Bauer, with
- ;; some integration and refinement by Ken Manheimer.
-
- ;;; Commentary:
-
- ;; Loading this package implements a more fine-grained minibuffer
- ;; completion feedback scheme. Prospective completions are concisely
- ;; indicated within the minibuffer itself, with each successive
- ;; keystroke.
-
- ;; See 'icomplete-completions' docstring for a description of the
- ;; icomplete display format.
-
- ;; See the `icomplete-minibuffer-setup-hook' docstring for a means to
- ;; customize icomplete setup for interoperation with other
- ;; minibuffer-oriented packages.
-
- ;; To activate icomplete mode, load the package and use the
- ;; `icomplete-mode' function. You can subsequently deactivate it by
- ;; invoking the function icomplete-mode with a negative prefix-arg
- ;; (C-U -1 ESC-x icomplete-mode). Also, you can prevent activation of
- ;; the mode during package load by first setting the variable
- ;; `icomplete-mode' to nil. Icompletion can be enabled any time after
- ;; the package is loaded by invoking icomplete-mode without a prefix
- ;; arg.
-
- ;; 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
- ;; contributors: Noah Freidman (restructuring as minor mode), Colin
- ;; Rafferty (lemacs reconciliation), Lars Lindberg, RMS, and others.
-
- ;; klm.
-
- ;;; Code:
-
- ;;;_* Provide
- (provide 'icomplete)
-
- (defgroup icomplete nil
- "Minibuffer completion incremental feedback."
- :group 'minibuffer)
-
-
- (defcustom icomplete-mode nil
- "*Non-nil activates incremental minibuffer completion."
- :type 'boolean
- :set (lambda (symbol value)
- (icomplete-mode (if value 1 -1)))
- :initialize 'custom-initialize-default
- :require 'icomplete
- :group 'icomplete)
-
- ;;;_* User Customization variables
- (defcustom icomplete-prospects-length 80
- "*Length of string displaying the prospects."
- :type 'integer
- :group 'icomplete)
- (defcustom icomplete-compute-delay .3
- "*Completions-computation stall, used only with large-number
- completions - see `icomplete-delay-completions-threshold'."
- :type 'number
- :group 'icomplete)
- (defcustom icomplete-delay-completions-threshold 400
- "*Pending-completions number over which to apply icomplete-compute-delay."
- :type 'integer
- :group 'icomplete)
- (defcustom icomplete-max-delay-chars 3
- "*Maximum number of initial chars to apply icomplete compute delay."
- :type 'integer
- :group 'icomplete)
-
- ;;;_* Initialization
- ;;;_ = icomplete-minibuffer-setup-hook
- (defcustom icomplete-minibuffer-setup-hook nil
- "*Icomplete-specific customization of minibuffer setup.
-
- This hook is run during minibuffer setup iff icomplete will be active.
- It is intended for use in customizing icomplete for interoperation
- with other packages. For instance:
-
- \(add-hook 'icomplete-minibuffer-setup-hook
- \(function
- \(lambda ()
- \(make-local-variable 'resize-minibuffer-window-max-height)
- \(setq resize-minibuffer-window-max-height 3))))
-
- will constrain rsz-mini to a maximum minibuffer height of 3 lines when
- icompletion is occurring."
- :type 'hook
- :group 'icomplete)
-
- ;;;_ + Internal Variables
- ;;;_ = icomplete-mode
- ;(defvar icomplete-mode t
- ; "*Nil inhibits activated incremental minibuffer completion.")
- ;;;_ = icomplete-eoinput 1
- (defvar icomplete-eoinput 1
- "Point where minibuffer input ends and completion info begins.")
- (make-variable-buffer-local 'icomplete-eoinput)
- ;;;_ = icomplete-pre-command-hook
- (defvar icomplete-pre-command-hook nil
- "Incremental-minibuffer-completion pre-command-hook.
-
- Is run in minibuffer before user input when `icomplete-mode' is non-nil.
- Use `icomplete-mode' function to set it up properly for incremental
- minibuffer completion.")
- (add-hook 'icomplete-pre-command-hook 'icomplete-tidy)
- ;;;_ = icomplete-post-command-hook
- (defvar icomplete-post-command-hook nil
- "Incremental-minibuffer-completion post-command-hook.
-
- Is run in minibuffer after user input when `icomplete-mode' is non-nil.
- Use `icomplete-mode' function to set it up properly for incremental
- minibuffer completion.")
- (add-hook 'icomplete-post-command-hook 'icomplete-exhibit)
-
- (defvar icomplete-show-key-bindings t
- "When non-nil, show key bindings as well as completion for sole matches.")
-
- (defun icomplete-get-keys (func-name)
- "Return strings naming keys bound to `func-name', or nil if none.
- Examines the prior, not current, buffer, presuming that current buffer
- is minibuffer."
- (if (commandp func-name)
- (save-excursion
- (let* ((sym (intern func-name))
- (buf (other-buffer))
- (map (save-excursion (set-buffer buf) (current-local-map)))
- (keys (where-is-internal sym map)))
- (if keys
- (concat "<"
- (mapconcat 'key-description
- (sort keys
- #'(lambda (x y)
- (< (length x) (length y))))
- ", ")
- ">"))))))
-
- ;;;_ > icomplete-mode (&optional prefix)
- ;;;###autoload
- (defun icomplete-mode (&optional prefix)
- "Activate incremental minibuffer completion for this emacs session.
- Deactivates with negative universal argument."
- (interactive "p")
- (or prefix (setq prefix 0))
- (cond ((>= prefix 0)
- (setq icomplete-mode t)
- ;; The following is not really necessary after first time -
- ;; no great loss.
- (add-hook 'minibuffer-setup-hook 'icomplete-minibuffer-setup))
- (t (setq icomplete-mode nil))))
-
- ;;;_ > icomplete-simple-completing-p ()
- (defun icomplete-simple-completing-p ()
- "Non-nil if current window is minibuffer that's doing simple completion.
-
- Conditions are:
- the selected window is a minibuffer,
- and not in the middle of macro execution,
- and minibuffer-completion-table is not a symbol (which would
- indicate some non-standard, non-simple completion mechanism,
- like file-name and other custom-func completions)."
-
- (and (window-minibuffer-p (selected-window))
- (not executing-kbd-macro)
- (not (symbolp minibuffer-completion-table))))
-
- ;;;_ > icomplete-minibuffer-setup ()
- ;;;###autoload
- (defun icomplete-minibuffer-setup ()
- "Run in minibuffer on activation to establish incremental completion.
- Usually run by inclusion in `minibuffer-setup-hook'."
- (cond ((and icomplete-mode (icomplete-simple-completing-p))
- (make-local-hook 'pre-command-hook)
- (add-hook 'pre-command-hook
- (function (lambda ()
- (run-hooks 'icomplete-pre-command-hook)))
- nil t)
- (make-local-hook 'post-command-hook)
- (add-hook 'post-command-hook
- (function (lambda ()
- (run-hooks 'icomplete-post-command-hook)))
- nil t)
- (run-hooks 'icomplete-minibuffer-setup-hook))))
-
- ;;;_* Completion
-
- ;;;_ > icomplete-tidy ()
- (defun icomplete-tidy ()
- "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'."
- (if (icomplete-simple-completing-p)
- (if (and (boundp 'icomplete-eoinput)
- icomplete-eoinput)
-
- (if (> icomplete-eoinput (point-max))
- ;; Oops, got rug pulled out from under us - reinit:
- (setq icomplete-eoinput (point-max))
- (let ((buffer-undo-list buffer-undo-list )) ; prevent entry
- (delete-region icomplete-eoinput (point-max))))
-
- ;; Reestablish the local variable 'cause minibuffer-setup is weird:
- (make-local-variable 'icomplete-eoinput)
- (setq icomplete-eoinput 1))))
-
- ;;;_ > icomplete-exhibit ()
- (defun icomplete-exhibit ()
- "Insert icomplete completions display.
- Should be run via minibuffer `post-command-hook'. See `icomplete-mode'
- and `minibuffer-setup-hook'."
- (if (icomplete-simple-completing-p)
- (let ((contents (buffer-substring (point-min)(point-max)))
- (buffer-undo-list t))
- (save-excursion
- (goto-char (point-max))
- ; Register the end of input, so we
- ; know where the extra stuff
- ; (match-status info) begins:
- (if (not (boundp 'icomplete-eoinput))
- ;; In case it got wiped out by major mode business:
- (make-local-variable 'icomplete-eoinput))
- (setq icomplete-eoinput (point))
- ; Insert the match-status information:
- (if (and (> (point-max) 1)
- (or
- ;; Don't bother with delay after certain number of chars:
- (> (point-max) icomplete-max-delay-chars)
- ;; Don't delay if alternatives number is small enough:
- (if minibuffer-completion-table
- (cond ((numberp minibuffer-completion-table)
- (< minibuffer-completion-table
- icomplete-delay-completions-threshold))
- ((sequencep minibuffer-completion-table)
- (< (length minibuffer-completion-table)
- icomplete-delay-completions-threshold))
- ))
- ;; Delay - give some grace time for next keystroke, before
- ;; embarking on computing completions:
- (sit-for icomplete-compute-delay)))
- (insert-string
- (icomplete-completions contents
- minibuffer-completion-table
- minibuffer-completion-predicate
- (not
- minibuffer-completion-confirm))))))))
-
- ;;;_ > icomplete-completions (name candidates predicate require-match)
- (defun icomplete-completions (name candidates predicate require-match)
- "Identify prospective candidates for minibuffer completion.
-
- The display is updated with each minibuffer keystroke during
- minibuffer completion.
-
- Prospective completion suffixes (if any) are displayed, bracketed by
- one of \(), \[], or \{} pairs. The choice of brackets is as follows:
-
- \(...) - 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
- further input is required to distinguish a single one.
-
- The displays for unambiguous matches have ` [Matched]' appended
- \(whether complete or not), or ` \[No matches]', if no eligible
- matches exist. \(Keybindings for uniquely matched commands are
- exhibited within the square braces.)"
-
- ;; 'all-completions' doesn't like empty
- ;; minibuffer-completion-table's (ie: (nil))
- (if (and (listp candidates) (null (car candidates)))
- (setq candidates nil))
-
- (let ((comps (all-completions name candidates predicate))
- ; "-determined" - only one candidate
- (open-bracket-determined (if require-match "(" "["))
- (close-bracket-determined (if require-match ")" "]")))
- ;; `concat'/`mapconcat' is the slow part. With the introduction of
- ;; `icomplete-prospects-length', there is no need for `catch'/`throw'.
- (if (null comps) (format " %sNo matches%s"
- open-bracket-determined
- close-bracket-determined)
- (let* ((most-try (try-completion name (mapcar (function list) comps)))
- (most (if (stringp most-try) most-try (car comps)))
- (most-len (length most))
- (determ (and (> most-len (length name))
- (concat open-bracket-determined
- (substring most (length name))
- close-bracket-determined)))
- (open-bracket-prospects "{")
- (close-bracket-prospects "}")
- ;"-prospects" - more than one candidate
- (prospects-len 0)
- prospects most-is-exact comp)
- (if (eq most-try t)
- (setq prospects nil)
- (while (and comps (< prospects-len icomplete-prospects-length))
- (setq comp (substring (car comps) most-len)
- comps (cdr comps))
- (cond ((string-equal comp "") (setq most-is-exact t))
- ((member comp prospects))
- (t (setq prospects (cons comp prospects)
- prospects-len (+ (length comp) 1 prospects-len))))))
- (if prospects
- (concat determ
- open-bracket-prospects
- (and most-is-exact ",")
- (mapconcat 'identity
- (sort prospects (function string-lessp))
- ",")
- (and comps ",...")
- close-bracket-prospects)
- (concat determ
- " [Matched"
- (let ((keys (and icomplete-show-key-bindings
- (commandp (intern-soft most))
- (icomplete-get-keys most))))
- (if keys
- (concat "; " keys)
- ""))
- "]"))))))
-
- (if (string-match "XEmacs\\|Lucid" emacs-version)
- (add-hook 'icomplete-minibuffer-setup-hook 'icomplete-exhibit))
-
- ;;;_* Local emacs vars.
- ;;;Local variables:
- ;;;outline-layout: (-2 :)
- ;;;End:
-
- ;;; icomplete.el ends here
-