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380 lines
14 KiB
EmacsLisp
380 lines
14 KiB
EmacsLisp
;;; icomplete.el --- minibuffer completion incremental feedback
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;; Copyright (C) 1992, 1993, 1994, 1997, 1999, 2001, 2002, 2003,
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;; 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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;; Author: Ken Manheimer <klm@i.am>
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;; Maintainer: Ken Manheimer <klm@i.am>
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;; Created: Mar 1993 Ken Manheimer, klm@nist.gov - first release to usenet
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;; Last update: Ken Manheimer <klm@i.am>, 11/18/1999.
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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
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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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;; Loading this package implements a more fine-grained minibuffer
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;; completion feedback scheme. Prospective completions are concisely
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;; indicated within the minibuffer itself, with each successive
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;; keystroke.
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;; See `icomplete-completions' docstring for a description of the
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;; icomplete display format.
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;; See the `icomplete-minibuffer-setup-hook' docstring for a means to
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;; customize icomplete setup for interoperation with other
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;; minibuffer-oriented packages.
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;; To activate icomplete mode, load the package and use the
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;; `icomplete-mode' function. You can subsequently deactivate it by
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;; invoking the function icomplete-mode with a negative prefix-arg
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;; (C-U -1 ESC-x icomplete-mode). Also, you can prevent activation of
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;; the mode during package load by first setting the variable
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;; `icomplete-mode' to nil. Icompletion can be enabled any time after
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;; the package is loaded by invoking icomplete-mode without a prefix
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;; arg.
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;; Thanks to everyone for their suggestions for refinements of this
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;; package. I particularly have to credit Michael Cook, who
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;; implemented an incremental completion style in his 'iswitch'
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;; 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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;;;_* Provide
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(provide 'icomplete)
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(defgroup icomplete nil
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"Show completions dynamically in minibuffer."
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:prefix "icomplete-"
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:group 'minibuffer)
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(defvar icomplete-prospects-length 80)
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(make-obsolete-variable
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'icomplete-prospects-length 'icomplete-prospects-height "23.1")
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;;;_* User Customization variables
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(defcustom icomplete-prospects-height
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;; 20 is an estimated common size for the prompt + minibuffer content, to
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;; try to guess the number of lines used up by icomplete-prospects-length.
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(+ 1 (/ (+ icomplete-prospects-length 20) (window-width)))
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"Maximum number of lines to use in the minibuffer."
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:type 'integer
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:group 'icomplete
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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.
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See `icomplete-delay-completions-threshold'."
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:type 'number
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:group 'icomplete)
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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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:group 'icomplete)
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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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:group 'icomplete)
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(defcustom icomplete-show-key-bindings t
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"If non-nil, show key bindings as well as completion for sole matches."
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:type 'boolean
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:group 'icomplete)
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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.
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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
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\(function
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\(lambda ()
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\(make-local-variable 'max-mini-window-height)
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\(setq 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."
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:type 'hook
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:group 'icomplete)
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;;;_* 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)
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"Overlay used to display the list of completions.")
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;;;_ = icomplete-pre-command-hook
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(defvar icomplete-pre-command-hook nil
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"Incremental-minibuffer-completion pre-command-hook.
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Is run in minibuffer before user input when `icomplete-mode' is non-nil.
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Use `icomplete-mode' function to set it up properly for incremental
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minibuffer completion.")
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(add-hook 'icomplete-pre-command-hook 'icomplete-tidy)
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;;;_ = icomplete-post-command-hook
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(defvar icomplete-post-command-hook nil
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"Incremental-minibuffer-completion post-command-hook.
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Is run in minibuffer after user input when `icomplete-mode' is non-nil.
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Use `icomplete-mode' function to set it up properly for incremental
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minibuffer completion.")
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(add-hook 'icomplete-post-command-hook 'icomplete-exhibit)
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(defun icomplete-get-keys (func-name)
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"Return strings naming keys bound to FUNC-NAME, or nil if none.
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Examines the prior, not current, buffer, presuming that current buffer
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is minibuffer."
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(when (commandp func-name)
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(save-excursion
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(let* ((sym (intern func-name))
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(buf (other-buffer nil t))
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(keys (with-current-buffer buf (where-is-internal sym))))
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(when keys
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(concat "<"
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(mapconcat 'key-description
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(sort keys
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#'(lambda (x y)
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(< (length x) (length y))))
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", ")
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">"))))))
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;;;_ = icomplete-with-completion-tables
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(defvar icomplete-with-completion-tables '(internal-complete-buffer)
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"Specialized completion tables with which icomplete should operate.
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Icomplete does not operate with any specialized completion tables
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except those on this list.")
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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 for this Emacs session.
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With a numeric argument, turn Icomplete mode on if ARG is positive,
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otherwise turn it off."
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:global t :group 'icomplete
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(if icomplete-mode
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;; The following is not really necessary after first time -
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;; no great loss.
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(add-hook 'minibuffer-setup-hook 'icomplete-minibuffer-setup)
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(remove-hook 'minibuffer-setup-hook 'icomplete-minibuffer-setup)))
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;;;_ > icomplete-simple-completing-p ()
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(defun icomplete-simple-completing-p ()
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"Non-nil if current window is minibuffer that's doing simple completion.
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Conditions are:
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the selected window is a minibuffer,
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and not in the middle of macro execution,
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and `minibuffer-completion-table' is not a symbol (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)."
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(and (window-minibuffer-p (selected-window))
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(not executing-kbd-macro)
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minibuffer-completion-table
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(or (not (functionp minibuffer-completion-table))
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(eq icomplete-with-completion-tables t)
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(member minibuffer-completion-table
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icomplete-with-completion-tables))))
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;;;_ > icomplete-minibuffer-setup ()
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(defun icomplete-minibuffer-setup ()
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"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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(add-hook 'pre-command-hook
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(lambda () (run-hooks 'icomplete-pre-command-hook))
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nil t)
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(add-hook 'post-command-hook
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(lambda () (run-hooks 'icomplete-post-command-hook))
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nil t)
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(run-hooks 'icomplete-minibuffer-setup-hook)))
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;
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;;;_* Completion
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;;;_ > icomplete-tidy ()
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(defun icomplete-tidy ()
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"Remove completions display \(if any) prior to new user input.
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Should be run in on the minibuffer `pre-command-hook'. See `icomplete-mode'
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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.
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Should be run via minibuffer `post-command-hook'. See `icomplete-mode'
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and `minibuffer-setup-hook'."
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(when (and icomplete-mode (icomplete-simple-completing-p))
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(save-excursion
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(goto-char (point-max))
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; Insert the match-status information:
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(if (and (> (point-max) (minibuffer-prompt-end))
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buffer-undo-list ; Wait for some user input.
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(or
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;; Don't bother with delay after certain number of chars:
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(> (- (point) (field-beginning)) icomplete-max-delay-chars)
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;; Don't delay if alternatives number is small enough:
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(and (sequencep minibuffer-completion-table)
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(< (length minibuffer-completion-table)
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icomplete-delay-completions-threshold))
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;; Delay - give some grace time for next keystroke, before
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;; embarking on computing completions:
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(sit-for icomplete-compute-delay)))
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(let ((text (while-no-input
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(icomplete-completions
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(field-string)
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minibuffer-completion-table
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minibuffer-completion-predicate
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(not minibuffer-completion-confirm))))
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(buffer-undo-list t)
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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))
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;; The current C cursor code doesn't know to use the overlay's
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;; marker's stickiness to figure out whether to place the cursor
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;; before or after the string, so let's spoon-feed it the pos.
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(put-text-property 0 1 'cursor t text)
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(overlay-put icomplete-overlay 'after-string text)))))))
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;;;_ > icomplete-completions (name candidates predicate require-match)
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(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.
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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,
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\[...] - a single prospect is identified but matching is optional, or
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\{...} - 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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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. \(Keybindings for uniquely matched commands
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are exhibited within the square braces.)"
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(let* ((comps (completion-all-sorted-completions))
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(last (if (consp comps) (last comps)))
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(base-size (cdr last))
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(open-bracket (if require-match "(" "["))
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(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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(format " %sNo matches%s" open-bracket close-bracket)
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(if last (setcdr last nil))
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(let* ((most-try
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(if (and base-size (> base-size 0))
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(completion-try-completion
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name candidates predicate (length name))
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;; If the `comps' are 0-based, the result should be
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;; the same with `comps'.
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(completion-try-completion
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name comps nil (length name))))
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(most (if (consp most-try) (car most-try)
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(if most-try (car comps) "")))
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;; Compare name and most, so we can determine if name is
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;; a prefix of most, or something else.
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(compare (compare-strings name nil nil
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most nil nil completion-ignore-case))
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(determ (unless (or (eq t compare) (eq t most-try)
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(= (setq compare (1- (abs compare)))
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(length most)))
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(concat open-bracket
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(cond
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((= compare (length name))
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;; Typical case: name is a prefix.
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(substring most compare))
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((< compare 5) most)
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(t (concat "..." (substring most compare))))
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close-bracket)))
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;;"-prospects" - more than one candidate
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(prospects-len (+ (length determ) 6 ;; take {,...} into account
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(string-width (buffer-string))))
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(prospects-max
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;; 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
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;; one line, increase the allowable space accordingly.
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(/ prospects-len (window-width)))
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(window-width)))
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(prefix-len
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;; Find the common prefix among `comps'.
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(if (eq t (compare-strings (car comps) nil (length most)
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most nil nil completion-ignore-case))
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;; Common case.
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(length most)
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;; Else, use try-completion.
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(let ((comps-prefix (try-completion "" comps)))
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(and (stringp comps-prefix)
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(length comps-prefix)))))
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prospects most-is-exact comp limit)
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(if (eq most-try t) ;; (or (null (cdr comps))
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(setq prospects nil)
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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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(cond ((string-equal comp "") (setq most-is-exact t))
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((member comp prospects))
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(t (setq prospects-len
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(+ (string-width comp) 1 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))))))
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;; Restore the base-size info, since completion-all-sorted-completions
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;; is cached.
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(if last (setcdr last base-size))
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(if prospects
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(concat determ
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"{"
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(and most-is-exact ",")
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(mapconcat 'identity (nreverse prospects) ",")
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(and limit ",...")
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"}")
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(concat determ
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" [Matched"
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(let ((keys (and icomplete-show-key-bindings
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(commandp (intern-soft most))
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(icomplete-get-keys most))))
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(if keys (concat "; " keys) ""))
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"]"))))))
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;;_* Local emacs vars.
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;;Local variables:
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;;allout-layout: (-2 :)
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;;End:
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;; arch-tag: 339ec25a-0741-4eb6-be63-997532e89b0f
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;;; icomplete.el ends here
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