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1317 lines
52 KiB
EmacsLisp
1317 lines
52 KiB
EmacsLisp
;;; pcomplete.el --- programmable completion -*- lexical-binding: t -*-
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;; Copyright (C) 1999-2022 Free Software Foundation, Inc.
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;; Author: John Wiegley <johnw@gnu.org>
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;; Keywords: processes 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 <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This module provides a programmable completion facility using
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;; "completion functions". Each completion function is responsible
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;; for producing a list of possible completions relevant to the current
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;; argument position.
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;;
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;; To use pcomplete with shell-mode, for example, you will need the
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;; following in your init file:
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;;
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;; (add-hook 'shell-mode-hook #'pcomplete-shell-setup)
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;;
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;; Most of the code below simply provides support mechanisms for
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;; writing completion functions. Completion functions themselves are
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;; very easy to write. They have few requirements beyond those of
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;; regular Lisp functions.
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;;
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;; Consider the following example, which will complete against
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;; filenames for the first two arguments, and directories for all
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;; remaining arguments:
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;;
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;; (defun pcomplete/my-command ()
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;; (pcomplete-here (pcomplete-entries))
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;; (pcomplete-here (pcomplete-entries))
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;; (while (pcomplete-here (pcomplete-dirs))))
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;;
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;; Here are the requirements for completion functions:
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;;
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;; @ They must be called "pcomplete/MAJOR-MODE/NAME", or
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;; "pcomplete/NAME". This is how they are looked up, using the NAME
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;; specified in the command argument (the argument in first
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;; position).
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;;
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;; @ They must be callable with no arguments.
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;;
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;; @ Their return value is ignored. If they actually return normally,
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;; it means no completions were available.
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;;
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;; @ In order to provide completions, they must throw the tag
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;; `pcomplete-completions'. The value must be a completion table
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;; (i.e. a table that can be passed to try-completion and friends)
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;; for the final argument.
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;;
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;; @ To simplify completion function logic, the tag `pcompleted' may
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;; be thrown with a value of nil in order to abort the function. It
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;; means that there were no completions available.
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;;
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;; When a completion function is called, the variable `pcomplete-args'
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;; is in scope, and contains all of the arguments specified on the
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;; command line. The variable `pcomplete-last' is the index of the
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;; last argument in that list.
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;;
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;; The variable `pcomplete-index' is used by the completion code to
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;; know which argument the completion function is currently examining.
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;; It always begins at 1, meaning the first argument after the command
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;; name.
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;;
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;; To facilitate writing completion logic, a special macro,
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;; `pcomplete-here', has been provided which does several things:
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;;
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;; 1. It will throw `pcompleted' (with a value of nil) whenever
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;; `pcomplete-index' exceeds `pcomplete-last'.
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;;
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;; 2. It will increment `pcomplete-index' if the final argument has
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;; not been reached yet.
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;;
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;; 3. It will evaluate the form passed to it, and throw the result
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;; using the `pcomplete-completions' tag, if it is called when
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;; `pcomplete-index' is pointing to the final argument.
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;;
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;; Sometimes a completion function will want to vary the possible
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;; completions for an argument based on the previous one. To
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;; facilitate tests like this, the function `pcomplete-test' and
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;; `pcomplete-match' are provided. Called with one argument, they
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;; test the value of the previous command argument. Otherwise, a
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;; relative index may be given as an optional second argument, where 0
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;; refers to the current argument, 1 the previous, 2 the one before
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;; that, etc. The symbols `first' and `last' specify absolute
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;; offsets.
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;;
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;; Here is an example which will only complete against directories for
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;; the second argument if the first argument is also a directory:
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;;
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;; (defun pcomplete/example ()
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;; (pcomplete-here (pcomplete-entries))
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;; (if (pcomplete-test #'file-directory-p)
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;; (pcomplete-here (pcomplete-dirs))
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;; (pcomplete-here (pcomplete-entries))))
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;;
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;; For generating completion lists based on directory contents, see
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;; the functions `pcomplete-entries', `pcomplete-dirs',
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;; `pcomplete-executables' and `pcomplete-all-entries'.
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;;
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;; Consult the documentation for `pcomplete-here' for information
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;; about its other arguments.
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;;; Code:
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(require 'comint)
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(defgroup pcomplete nil
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"Programmable completion."
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:version "21.1"
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:group 'processes)
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;;; User Variables:
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(defcustom pcomplete-file-ignore nil
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"A regexp of filenames to be disregarded during file completion."
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:type '(choice regexp (const :tag "None" nil)))
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(defcustom pcomplete-dir-ignore nil
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"A regexp of names to be disregarded during directory completion."
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:type '(choice regexp (const :tag "None" nil)))
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(define-obsolete-variable-alias 'pcomplete-ignore-case 'completion-ignore-case
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"28.1")
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(defcustom pcomplete-autolist nil
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"If non-nil, automatically list possibilities on partial completion.
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This mirrors the optional behavior of tcsh."
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:type 'boolean)
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(defcustom pcomplete-suffix-list (list ?/ ?:)
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"A list of characters which constitute a proper suffix."
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:type '(repeat character))
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(make-obsolete-variable 'pcomplete-suffix-list nil "24.1")
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(defcustom pcomplete-recexact nil
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"If non-nil, use shortest completion if characters cannot be added.
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This mirrors the optional behavior of tcsh.
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A non-nil value is useful if `pcomplete-autolist' is non-nil too."
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:type 'boolean)
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(define-obsolete-variable-alias
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'pcomplete-arg-quote-list 'comint-file-name-quote-list "24.3")
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(defcustom pcomplete-man-function #'man
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"A function to that will be called to display a manual page.
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It will be passed the name of the command to document."
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:type 'function)
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(defcustom pcomplete-compare-entry-function #'string-lessp
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"This function is used to order file entries for completion.
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The behavior of most all shells is to sort alphabetically."
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:type '(radio (function-item string-lessp)
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(function-item file-newer-than-file-p)
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(function :tag "Other")))
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(defcustom pcomplete-help nil
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"A string or function (or nil) used for context-sensitive help.
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If a string, it should name an Info node that will be jumped to.
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If non-nil, it must a sexp that will be evaluated, and whose
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result will be shown in the minibuffer.
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If nil, the function `pcomplete-man-function' will be called with the
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current command argument."
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:type '(choice string sexp (const :tag "Use man page" nil)))
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(defcustom pcomplete-expand-before-complete nil
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"If non-nil, expand the current argument before completing it.
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This means that typing something such as `$HOME/bi' followed by
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\\[pcomplete-argument] will cause the variable reference to be
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resolved first, and the resultant value that will be completed against
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to be inserted in the buffer. Note that exactly what gets expanded
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and how is entirely up to the behavior of the
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`pcomplete-parse-arguments-function'."
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:type 'boolean)
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(defcustom pcomplete-parse-arguments-function
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#'pcomplete-parse-buffer-arguments
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"A function to call to parse the current line's arguments.
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It should be called with no parameters, and with point at the position
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of the argument that is to be completed.
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It must either return nil, or a cons cell of the form:
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((ARG...) (BEG-POS...))
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The two lists must be identical in length. The first gives the final
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value of each command line argument (which need not match the textual
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representation of that argument), and BEG-POS gives the beginning
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position of each argument, as it is seen by the user. The establishes
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a relationship between the fully resolved value of the argument, and
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the textual representation of the argument."
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:type 'function)
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(defcustom pcomplete-cycle-completions t
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"If non-nil, hitting the TAB key cycles through the completion list.
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Typical Emacs behavior is to complete as much as possible, then pause
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waiting for further input. Then if TAB is hit again, show a list of
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possible completions. When `pcomplete-cycle-completions' is non-nil,
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it acts more like zsh or 4nt, showing the first maximal match first,
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followed by any further matches on each subsequent pressing of the TAB
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key. \\[pcomplete-list] is the key to press if the user wants to see
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the list of possible completions."
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:type 'boolean)
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(defcustom pcomplete-cycle-cutoff-length 5
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"If the number of completions is greater than this, don't cycle.
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This variable is a compromise between the traditional Emacs style of
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completion, and the \"cycling\" style. Basically, if there are more
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than this number of completions possible, don't automatically pick the
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first one and then expect the user to press TAB to cycle through them.
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Typically, when there are a large number of completion possibilities,
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the user wants to see them in a list buffer so that they can know what
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options are available. But if the list is small, it means the user
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has already entered enough input to disambiguate most of the
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possibilities, and therefore they are probably most interested in
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cycling through the candidates. Set this value to nil if you want
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cycling to always be enabled."
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:type '(choice integer (const :tag "Always cycle" nil)))
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(defcustom pcomplete-restore-window-delay 1
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"The number of seconds to wait before restoring completion windows.
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Once the completion window has been displayed, if the user then goes
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on to type something else, that completion window will be removed from
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the display (actually, the original window configuration before it was
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displayed will be restored), after this many seconds of idle time. If
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set to nil, completion windows will be left on second until the user
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removes them manually. If set to 0, they will disappear immediately
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after the user enters a key other than TAB."
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:type '(choice integer (const :tag "Never restore" nil)))
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(defcustom pcomplete-try-first-hook nil
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"A list of functions which are called before completing an argument.
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This can be used, for example, for completing things which might apply
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to all arguments, such as variable names after a $."
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:type 'hook)
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(defsubst pcomplete-executables (&optional regexp)
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"Complete amongst a list of directories and executables."
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(pcomplete-entries regexp #'file-executable-p))
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(defmacro pcomplete-here (&optional form stub paring form-only)
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"Complete against the current argument, if at the end.
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If completion is to be done here, evaluate FORM to generate the completion
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table which will be used for completion purposes. If STUB is a
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string, use it as the completion stub instead of the default (which is
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the entire text of the current argument).
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For an example of when you might want to use STUB: if the current
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argument text is `long-path-name/', you don't want the completions
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list display to be cluttered by `long-path-name/' appearing at the
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beginning of every alternative. Not only does this make things less
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intelligible, but it is also inefficient. Yet, if the completion list
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does not begin with this string for every entry, the current argument
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won't complete correctly.
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The solution is to specify a relative stub. It allows you to
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substitute a different argument from the current argument, almost
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always for the sake of efficiency.
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If PARING is nil, this argument will be pared against previous
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arguments using the function `file-truename' to normalize them.
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PARING may be a function, in which case that function is used for
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normalization. If PARING is t, the argument dealt with by this
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call will not participate in argument paring. If it is the
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integer 0, all previous arguments that have been seen will be
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cleared.
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If FORM-ONLY is non-nil, only the result of FORM will be used to
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generate the completions list. This means that the hook
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`pcomplete-try-first-hook' will not be run."
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(declare (debug t))
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`(pcomplete--here (lambda () ,form) ,stub ,paring ,form-only))
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(defcustom pcomplete-command-completion-function
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(lambda ()
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(pcomplete-here (pcomplete-executables)))
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"Function called for completing the initial command argument."
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:type 'function)
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(defcustom pcomplete-command-name-function #'pcomplete-command-name
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"Function called for determining the current command name."
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:type 'function)
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(defcustom pcomplete-default-completion-function
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(lambda ()
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(while (pcomplete-here (pcomplete-entries))))
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"Function called when no completion rule can be found.
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This function is used to generate completions for every argument."
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:type 'function)
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(defcustom pcomplete-use-paring t
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"If t, pare alternatives that have already been used.
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If nil, you will always see the completion set of possible options, no
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matter which of those options have already been used in previous
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command arguments."
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:type 'boolean)
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(defcustom pcomplete-termination-string " "
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"A string that is inserted after any completion or expansion.
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This is usually a space character, useful when completing lists of
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words separated by spaces. However, if your list uses a different
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separator character, or if the completion occurs in a word that is
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already terminated by a character, this variable should be locally
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modified to be an empty string, or the desired separation string."
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:type 'string)
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(defcustom pcomplete-hosts-file "/etc/hosts"
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"The name of the /etc/hosts file."
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:type '(choice (const :tag "No hosts file" nil) file))
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;;; Internal Variables:
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;; for cycling completion support
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(defvar-local pcomplete-current-completions nil)
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(defvar-local pcomplete-last-completion-length nil)
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(defvar-local pcomplete-last-completion-stub nil)
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(defvar-local pcomplete-last-completion-raw nil)
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(defvar-local pcomplete-last-window-config nil)
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(defvar-local pcomplete-window-restore-timer nil)
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;; used for altering pcomplete's behavior. These global variables
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;; should always be nil.
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(defvar pcomplete-show-help nil)
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(defvar pcomplete-show-list nil)
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(defvar pcomplete-expand-only-p nil)
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;; for the sake of the byte-compiler, when compiling other files that
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;; contain completion functions
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(defvar pcomplete-args nil)
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(defvar pcomplete-begins nil)
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(defvar pcomplete-last nil)
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(defvar pcomplete-index nil)
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(defvar pcomplete-stub nil)
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(defvar pcomplete-seen nil)
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(defvar pcomplete-norm-func nil)
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;;; User Functions:
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;;; Alternative front-end using the standard completion facilities.
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;; The way pcomplete-parse-arguments, pcomplete-stub, and
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;; pcomplete-quote-argument work only works because of some deep
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;; hypothesis about the way the completion work. Basically, it makes
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;; it pretty much impossible to have completion other than
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;; prefix-completion.
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;;
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;; pcomplete--common-suffix and completion-table-subvert try to work around
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;; this difficulty with heuristics, but it's really a hack.
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(defvar pcomplete-unquote-argument-function #'comint--unquote-argument)
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(defsubst pcomplete-unquote-argument (s)
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(funcall pcomplete-unquote-argument-function s))
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(defvar pcomplete-requote-argument-function #'comint--requote-argument)
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(defun pcomplete--common-suffix (s1 s2)
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;; Since S2 is expected to be the "unquoted/expanded" version of S1,
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;; there shouldn't be any case difference, even if the completion is
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;; case-insensitive.
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(let ((case-fold-search nil))
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(string-match
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;; \x3FFF7F is just an arbitrary char among the ones Emacs accepts
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;; that hopefully will never appear in normal text.
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"\\(?:.\\|\n\\)*?\\(\\(?:.\\|\n\\)*\\)\x3FFF7F\\(?:.\\|\n\\)*\\1\\'"
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(concat s1 "\x3FFF7F" s2))
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(- (match-end 1) (match-beginning 1))))
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(defun pcomplete-completions-at-point ()
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"Provide standard completion using pcomplete's completion tables.
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Same as `pcomplete' but using the standard completion UI."
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;; FIXME: it only completes the text before point, whereas the
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;; standard UI may also consider text after point.
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;; FIXME: the `pcomplete' UI may be used internally during
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;; pcomplete-completions and then throw to `pcompleted', thus
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;; imposing the pcomplete UI over the standard UI.
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(catch 'pcompleted
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(let* ((pcomplete-stub)
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pcomplete-seen pcomplete-norm-func
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pcomplete-args pcomplete-last pcomplete-index
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(pcomplete-autolist pcomplete-autolist)
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(pcomplete-suffix-list pcomplete-suffix-list)
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;; Apparently the vars above are global vars modified by
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;; side-effects, whereas pcomplete-completions is the core
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;; function that finds the chunk of text to complete
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;; (returned indirectly in pcomplete-stub) and the set of
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;; possible completions.
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(completions (pcomplete-completions))
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;; Usually there's some close connection between pcomplete-stub
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;; and the text before point. But depending on what
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;; pcomplete-parse-arguments-function does, that connection
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;; might not be that close. E.g. in eshell,
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;; pcomplete-parse-arguments-function expands envvars.
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;;
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;; Since we use minibuffer-complete, which doesn't know
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;; pcomplete-stub and works from the buffer's text instead,
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;; we need to trick minibuffer-complete, into using
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;; pcomplete-stub without its knowledge. To that end, we
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;; use completion-table-subvert to construct a completion
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;; table which expects strings using a prefix from the
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;; buffer's text but internally uses the corresponding
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;; prefix from pcomplete-stub.
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;;
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(argbeg (pcomplete-begin))
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;; When completing an envvar within an argument in Eshell
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;; (e.g. "cd /home/$US TAB"), `pcomplete-stub' will just be
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;; "US" whereas `argbeg' will point to the first "/".
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;; We could rely on c-t-subvert to handle the difference,
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;; but we try here to guess the "real" beginning so as to
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;; rely less on c-t-subvert.
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(beg (max (- (point) (length pcomplete-stub))
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argbeg))
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buftext)
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;; Try and improve our guess of `beg' in case the difference
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;; between pcomplete-stub and the buffer's text is simply due to
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;; some chars removed by unquoting. Again, this is not
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;; indispensable but reduces the reliance on c-t-subvert and
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;; improves corner case behaviors.
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(while (progn (setq buftext (pcomplete-unquote-argument
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(buffer-substring beg (point))))
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(and (> beg argbeg)
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(> (length pcomplete-stub) (length buftext))))
|
|
(setq beg (max argbeg (- beg (- (length pcomplete-stub)
|
|
(length buftext))))))
|
|
(when completions
|
|
(let ((table
|
|
(completion-table-with-quoting
|
|
(if (equal pcomplete-stub buftext)
|
|
completions
|
|
;; This may not always be strictly right, but given the lack
|
|
;; of any other info, it's about as good as it gets, and in
|
|
;; practice it should work just fine (fingers crossed).
|
|
(let ((suf-len (pcomplete--common-suffix
|
|
pcomplete-stub buftext)))
|
|
(completion-table-subvert
|
|
completions
|
|
(substring buftext 0 (- (length buftext) suf-len))
|
|
(substring pcomplete-stub 0
|
|
(- (length pcomplete-stub) suf-len)))))
|
|
pcomplete-unquote-argument-function
|
|
pcomplete-requote-argument-function))
|
|
(pred
|
|
;; Pare it down, if applicable.
|
|
(when (and pcomplete-use-paring pcomplete-seen)
|
|
;; Capture the dynbound values for later use.
|
|
(let ((norm-func pcomplete-norm-func)
|
|
(seen
|
|
(mapcar (lambda (f)
|
|
(funcall pcomplete-norm-func
|
|
(directory-file-name f)))
|
|
pcomplete-seen)))
|
|
(lambda (f)
|
|
(not (member
|
|
(funcall norm-func (directory-file-name f))
|
|
seen)))))))
|
|
(when completion-ignore-case
|
|
(setq table (completion-table-case-fold table)))
|
|
(list beg (point) table
|
|
:predicate pred
|
|
:exit-function
|
|
;; If completion is finished, add a terminating space.
|
|
;; We used to also do this if STATUS is `sole', but
|
|
;; that does not work right when completion cycling.
|
|
(unless (zerop (length pcomplete-termination-string))
|
|
(lambda (_s status)
|
|
(when (eq status 'finished)
|
|
(if (looking-at
|
|
(regexp-quote pcomplete-termination-string))
|
|
(goto-char (match-end 0))
|
|
(insert pcomplete-termination-string)))))))))))
|
|
|
|
;; I don't think such commands are usable before first setting up buffer-local
|
|
;; variables to parse args, so there's no point autoloading it.
|
|
;; ;;;###autoload
|
|
(defun pcomplete-std-complete ()
|
|
(let ((data (pcomplete-completions-at-point)))
|
|
(completion-in-region (nth 0 data) (nth 1 data) (nth 2 data)
|
|
(plist-get :predicate (nthcdr 3 data)))))
|
|
|
|
;;; Pcomplete's native UI.
|
|
|
|
;;;###autoload
|
|
(defun pcomplete (&optional interactively)
|
|
"Support extensible programmable completion.
|
|
To use this function, just bind the TAB key to it, or add it to your
|
|
completion functions list (it should occur fairly early in the list)."
|
|
(declare (obsolete "use completion-at-point and pcomplete-completions-at-point" "27.1"))
|
|
(interactive "p")
|
|
(if (and interactively
|
|
pcomplete-cycle-completions
|
|
pcomplete-current-completions
|
|
(memq last-command '(pcomplete
|
|
pcomplete-expand-and-complete
|
|
pcomplete-reverse)))
|
|
(progn
|
|
(delete-char (- pcomplete-last-completion-length))
|
|
(if (eq this-command 'pcomplete-reverse)
|
|
(progn
|
|
(push (car (last pcomplete-current-completions))
|
|
pcomplete-current-completions)
|
|
(setcdr (last pcomplete-current-completions 2) nil))
|
|
(nconc pcomplete-current-completions
|
|
(list (car pcomplete-current-completions)))
|
|
(setq pcomplete-current-completions
|
|
(cdr pcomplete-current-completions)))
|
|
(pcomplete-insert-entry pcomplete-last-completion-stub
|
|
(car pcomplete-current-completions)
|
|
nil pcomplete-last-completion-raw))
|
|
(setq pcomplete-current-completions nil
|
|
pcomplete-last-completion-raw nil)
|
|
(catch 'pcompleted
|
|
(let* ((pcomplete-stub)
|
|
pcomplete-seen pcomplete-norm-func
|
|
pcomplete-args pcomplete-last pcomplete-index
|
|
(pcomplete-autolist pcomplete-autolist)
|
|
(pcomplete-suffix-list pcomplete-suffix-list)
|
|
(completions (pcomplete-completions))
|
|
(result (pcomplete-do-complete pcomplete-stub completions)))
|
|
(and result
|
|
(not (eq (car result) 'listed))
|
|
(cdr result)
|
|
(pcomplete-insert-entry pcomplete-stub (cdr result)
|
|
(memq (car result)
|
|
'(sole shortest))
|
|
pcomplete-last-completion-raw))))))
|
|
|
|
;;;###autoload
|
|
(defun pcomplete-reverse ()
|
|
"If cycling completion is in use, cycle backwards."
|
|
(interactive)
|
|
(call-interactively 'pcomplete))
|
|
|
|
;;;###autoload
|
|
(defun pcomplete-expand-and-complete ()
|
|
"Expand the textual value of the current argument.
|
|
This will modify the current buffer."
|
|
(interactive)
|
|
(let ((pcomplete-expand-before-complete t))
|
|
(with-suppressed-warnings ((obsolete pcomplete))
|
|
(pcomplete))))
|
|
|
|
;;;###autoload
|
|
(defun pcomplete-continue ()
|
|
"Complete without reference to any cycling completions."
|
|
(interactive)
|
|
(setq pcomplete-current-completions nil
|
|
pcomplete-last-completion-raw nil)
|
|
(call-interactively 'pcomplete))
|
|
|
|
;;;###autoload
|
|
(defun pcomplete-expand ()
|
|
"Expand the textual value of the current argument.
|
|
This will modify the current buffer."
|
|
(interactive)
|
|
(let ((pcomplete-expand-before-complete t)
|
|
(pcomplete-expand-only-p t))
|
|
(with-suppressed-warnings ((obsolete pcomplete))
|
|
(pcomplete))
|
|
(when (and pcomplete-current-completions
|
|
(> (length pcomplete-current-completions) 0)) ;??
|
|
(delete-char (- pcomplete-last-completion-length))
|
|
(while pcomplete-current-completions
|
|
(unless (pcomplete-insert-entry
|
|
"" (car pcomplete-current-completions) t
|
|
pcomplete-last-completion-raw)
|
|
(insert-and-inherit pcomplete-termination-string))
|
|
(setq pcomplete-current-completions
|
|
(cdr pcomplete-current-completions))))))
|
|
|
|
;;;###autoload
|
|
(defun pcomplete-help ()
|
|
"Display any help information relative to the current argument."
|
|
(declare (obsolete "use completion-help-at-point and pcomplete-completions-at-point" "27.1"))
|
|
(interactive)
|
|
(let ((pcomplete-show-help t))
|
|
(with-suppressed-warnings ((obsolete pcomplete))
|
|
(pcomplete))))
|
|
|
|
;;;###autoload
|
|
(defun pcomplete-list ()
|
|
"Show the list of possible completions for the current argument."
|
|
(interactive)
|
|
(when (and pcomplete-cycle-completions
|
|
pcomplete-current-completions
|
|
(eq last-command 'pcomplete-argument))
|
|
(delete-char (- pcomplete-last-completion-length))
|
|
(setq pcomplete-current-completions nil
|
|
pcomplete-last-completion-raw nil))
|
|
(let ((pcomplete-show-list t))
|
|
(with-suppressed-warnings ((obsolete pcomplete))
|
|
(pcomplete))))
|
|
|
|
;;; Internal Functions:
|
|
|
|
;; argument handling
|
|
(defun pcomplete-arg (&optional index offset)
|
|
"Return the textual content of the INDEXth argument.
|
|
INDEX is based from the current processing position. If INDEX is
|
|
positive, values returned are closer to the command argument; if
|
|
negative, they are closer to the last argument. If the INDEX is
|
|
outside of the argument list, nil is returned. The default value for
|
|
INDEX is 0, meaning the current argument being examined.
|
|
|
|
The special indices `first' and `last' may be used to access those
|
|
parts of the list.
|
|
|
|
The OFFSET argument is added to/taken away from the index that will be
|
|
used. This is really only useful with `first' and `last', for
|
|
accessing absolute argument positions."
|
|
(setq index
|
|
(if (eq index 'first)
|
|
0
|
|
(if (eq index 'last)
|
|
pcomplete-last
|
|
(- pcomplete-index (or index 0)))))
|
|
(if offset
|
|
(setq index (+ index offset)))
|
|
(nth index pcomplete-args))
|
|
|
|
(defun pcomplete-begin (&optional index offset)
|
|
"Return the beginning position of the INDEXth argument.
|
|
See the documentation for `pcomplete-arg'."
|
|
(setq index
|
|
(if (eq index 'first)
|
|
0
|
|
(if (eq index 'last)
|
|
pcomplete-last
|
|
(- pcomplete-index (or index 0)))))
|
|
(if offset
|
|
(setq index (+ index offset)))
|
|
(nth index pcomplete-begins))
|
|
|
|
(defsubst pcomplete-actual-arg (&optional index offset)
|
|
"Return the actual text representation of the last argument.
|
|
This is different from `pcomplete-arg', which returns the textual value
|
|
that the last argument evaluated to. This function returns what the
|
|
user actually typed in."
|
|
(buffer-substring (pcomplete-begin index offset) (point)))
|
|
|
|
(defsubst pcomplete-next-arg ()
|
|
"Move the various pointers to the next argument."
|
|
(setq pcomplete-index (1+ pcomplete-index)
|
|
pcomplete-stub (pcomplete-arg))
|
|
(if (> pcomplete-index pcomplete-last)
|
|
(progn
|
|
(message "No completions")
|
|
(throw 'pcompleted nil))))
|
|
|
|
(defun pcomplete-command-name ()
|
|
"Return the command name of the first argument."
|
|
(file-name-nondirectory (pcomplete-arg 'first)))
|
|
|
|
(defun pcomplete-match (regexp &optional index offset start)
|
|
"Like `string-match', but on the current completion argument."
|
|
(let ((arg (pcomplete-arg (or index 1) offset)))
|
|
(if arg
|
|
(string-match regexp arg start)
|
|
(throw 'pcompleted nil))))
|
|
|
|
(defun pcomplete-match-string (which &optional index offset)
|
|
"Like `match-string', but on the current completion argument."
|
|
(let ((arg (pcomplete-arg (or index 1) offset)))
|
|
(if arg
|
|
(match-string which arg)
|
|
(throw 'pcompleted nil))))
|
|
|
|
(define-obsolete-function-alias 'pcomplete-match-beginning #'match-beginning "29.1")
|
|
(define-obsolete-function-alias 'pcomplete-match-end #'match-end "29.1")
|
|
|
|
(defsubst pcomplete--test (pred arg)
|
|
"Perform a programmable completion predicate match."
|
|
(and pred
|
|
(cond ((eq pred t) t)
|
|
((functionp pred)
|
|
(funcall pred arg))
|
|
((stringp pred)
|
|
(string-match (concat "^" pred "$") arg)))
|
|
pred))
|
|
|
|
(defun pcomplete-test (predicates &optional index offset)
|
|
"Predicates to test the current programmable argument with."
|
|
(let ((arg (pcomplete-arg (or index 1) offset)))
|
|
(unless (null predicates)
|
|
(if (not (listp predicates))
|
|
(pcomplete--test predicates arg)
|
|
(let ((pred predicates)
|
|
found)
|
|
(while (and pred (not found))
|
|
(setq found (pcomplete--test (car pred) arg)
|
|
pred (cdr pred)))
|
|
found)))))
|
|
|
|
(defun pcomplete-parse-buffer-arguments ()
|
|
"Parse whitespace separated arguments in the current region."
|
|
(let ((begin (point-min))
|
|
(end (point-max))
|
|
begins args)
|
|
(save-excursion
|
|
(goto-char begin)
|
|
(while (< (point) end)
|
|
(skip-chars-forward " \t\n")
|
|
(push (point) begins)
|
|
(skip-chars-forward "^ \t\n")
|
|
(push (buffer-substring-no-properties
|
|
(car begins) (point))
|
|
args))
|
|
(cons (nreverse args) (nreverse begins)))))
|
|
|
|
;;;###autoload
|
|
(defun pcomplete-comint-setup (completef-sym)
|
|
"Setup a comint buffer to use pcomplete.
|
|
COMPLETEF-SYM should be the symbol where the
|
|
dynamic-complete-functions are kept. For comint mode itself,
|
|
this is `comint-dynamic-complete-functions'."
|
|
(setq-local pcomplete-parse-arguments-function
|
|
#'pcomplete-parse-comint-arguments)
|
|
(add-hook 'completion-at-point-functions
|
|
#'pcomplete-completions-at-point nil 'local)
|
|
(set (make-local-variable completef-sym)
|
|
(copy-sequence (symbol-value completef-sym)))
|
|
(let* ((funs (symbol-value completef-sym))
|
|
(elem (or (memq 'comint-filename-completion funs)
|
|
(memq 'shell-filename-completion funs)
|
|
(memq 'shell-dynamic-complete-filename funs)
|
|
(memq 'comint-dynamic-complete-filename funs))))
|
|
(if elem
|
|
(setcar elem 'pcomplete)
|
|
(add-to-list completef-sym 'pcomplete))))
|
|
|
|
;;;###autoload
|
|
(defun pcomplete-shell-setup ()
|
|
"Setup `shell-mode' to use pcomplete."
|
|
;; FIXME: insufficient
|
|
(pcomplete-comint-setup 'comint-dynamic-complete-functions))
|
|
|
|
(declare-function comint-bol "comint" (&optional arg))
|
|
|
|
(defun pcomplete-parse-comint-arguments ()
|
|
"Parse whitespace separated arguments in the current region."
|
|
(declare (obsolete comint-parse-pcomplete-arguments "24.1"))
|
|
(let ((begin (save-excursion (comint-bol nil) (point)))
|
|
(end (point))
|
|
begins args)
|
|
(save-excursion
|
|
(goto-char begin)
|
|
(while (< (point) end)
|
|
(skip-chars-forward " \t\n")
|
|
(push (point) begins)
|
|
(while
|
|
(progn
|
|
(skip-chars-forward "^ \t\n\\\\")
|
|
(when (eq (char-after) ?\\)
|
|
(forward-char 1)
|
|
(unless (eolp)
|
|
(forward-char 1)
|
|
t))))
|
|
(push (buffer-substring-no-properties (car begins) (point))
|
|
args))
|
|
(cons (nreverse args) (nreverse begins)))))
|
|
|
|
(defun pcomplete-parse-arguments (&optional expand-p)
|
|
"Parse the command line arguments. Most completions need this info."
|
|
(let ((results (funcall pcomplete-parse-arguments-function)))
|
|
(when results
|
|
(setq pcomplete-args (or (car results) (list ""))
|
|
pcomplete-begins (or (cdr results) (list (point)))
|
|
pcomplete-last (1- (length pcomplete-args))
|
|
pcomplete-index 0
|
|
pcomplete-stub (pcomplete-arg 'last))
|
|
(let ((begin (pcomplete-begin 'last)))
|
|
(if (and (listp pcomplete-stub) ;??
|
|
(not pcomplete-expand-only-p))
|
|
(let* ((completions pcomplete-stub) ;??
|
|
(common-stub (car completions))
|
|
(c completions)
|
|
(len (length common-stub)))
|
|
(while (and c (> len 0))
|
|
(while (and (> len 0)
|
|
(not (string=
|
|
(substring common-stub 0 len)
|
|
(substring (car c) 0
|
|
(min (length (car c))
|
|
len)))))
|
|
(setq len (1- len)))
|
|
(setq c (cdr c)))
|
|
(setq pcomplete-stub (substring common-stub 0 len)
|
|
pcomplete-autolist t)
|
|
(when (and begin (> len 0) (not pcomplete-show-list))
|
|
(delete-region begin (point))
|
|
(pcomplete-insert-entry "" pcomplete-stub))
|
|
(throw 'pcomplete-completions completions))
|
|
(when expand-p
|
|
(if (stringp pcomplete-stub)
|
|
(when begin
|
|
(delete-region begin (point))
|
|
(insert-and-inherit pcomplete-stub))
|
|
(if (and (listp pcomplete-stub)
|
|
pcomplete-expand-only-p)
|
|
;; this is for the benefit of `pcomplete-expand'
|
|
(setq pcomplete-last-completion-length (- (point) begin)
|
|
pcomplete-current-completions pcomplete-stub)
|
|
(error "Cannot expand argument"))))
|
|
(if pcomplete-expand-only-p
|
|
(throw 'pcompleted t)
|
|
pcomplete-args))))))
|
|
|
|
(define-obsolete-function-alias
|
|
'pcomplete-quote-argument #'comint-quote-filename "24.3")
|
|
|
|
;; file-system completion lists
|
|
|
|
(defsubst pcomplete-dirs-or-entries (&optional regexp predicate)
|
|
"Return either directories, or qualified entries."
|
|
(pcomplete-entries
|
|
nil
|
|
(lambda (f)
|
|
(or (file-directory-p f)
|
|
(and (or (null regexp) (string-match regexp f))
|
|
(or (null predicate) (funcall predicate f)))))))
|
|
|
|
(defun pcomplete--entries (&optional regexp predicate)
|
|
"Like `pcomplete-entries' but without env-var handling."
|
|
(let* ((ign-pred
|
|
(when (or pcomplete-file-ignore pcomplete-dir-ignore)
|
|
;; Capture the dynbound value for later use.
|
|
(let ((file-ignore pcomplete-file-ignore)
|
|
(dir-ignore pcomplete-dir-ignore))
|
|
(lambda (file)
|
|
(not
|
|
(if (eq (aref file (1- (length file))) ?/)
|
|
(and dir-ignore (string-match dir-ignore file))
|
|
(and file-ignore (string-match file-ignore file))))))))
|
|
(reg-pred (if regexp (lambda (file) (string-match regexp file))))
|
|
(pred (cond
|
|
((null (or ign-pred reg-pred)) predicate)
|
|
((null (or ign-pred predicate)) reg-pred)
|
|
((null (or reg-pred predicate)) ign-pred)
|
|
(t (lambda (f)
|
|
(and (or (null reg-pred) (funcall reg-pred f))
|
|
(or (null ign-pred) (funcall ign-pred f))
|
|
(or (null predicate) (funcall predicate f))))))))
|
|
(lambda (s p a)
|
|
(if (and (eq a 'metadata) pcomplete-compare-entry-function)
|
|
`(metadata (cycle-sort-function
|
|
. ,(lambda (comps)
|
|
(sort comps pcomplete-compare-entry-function)))
|
|
,@(cdr (completion-file-name-table s p a)))
|
|
(let ((completion-ignored-extensions nil)
|
|
(completion-ignore-case completion-ignore-case))
|
|
(completion-table-with-predicate
|
|
#'comint-completion-file-name-table pred 'strict s p a))))))
|
|
|
|
(defconst pcomplete--env-regexp
|
|
"\\(?:\\`\\|[^\\]\\)\\(?:\\\\\\\\\\)*\\(\\$\\(?:{\\([^}]+\\)}\\|\\(?2:[[:alnum:]_]+\\)\\)\\)")
|
|
|
|
(defun pcomplete-entries (&optional regexp predicate)
|
|
"Complete against a list of directory candidates.
|
|
If REGEXP is non-nil, it is a regular expression used to refine the
|
|
match (files not matching the REGEXP will be excluded).
|
|
If PREDICATE is non-nil, it will also be used to refine the match
|
|
\(files for which the PREDICATE returns nil will be excluded).
|
|
If no directory information can be extracted from the completed
|
|
component, `default-directory' is used as the basis for completion."
|
|
;; FIXME: The old code did env-var expansion here, so we reproduce this
|
|
;; behavior for now, but really env-var handling should be performed globally
|
|
;; rather than here since it also applies to non-file arguments.
|
|
(let ((table (pcomplete--entries regexp predicate)))
|
|
(lambda (string pred action)
|
|
(let ((strings nil)
|
|
(orig-length (length string)))
|
|
;; Perform env-var expansion.
|
|
(while (string-match pcomplete--env-regexp string)
|
|
(push (substring string 0 (match-beginning 1)) strings)
|
|
(push (getenv (match-string 2 string)) strings)
|
|
(setq string (substring string (match-end 1))))
|
|
(if (not (and strings
|
|
(or (eq action t)
|
|
(eq (car-safe action) 'boundaries))))
|
|
(let ((newstring
|
|
(mapconcat #'identity (nreverse (cons string strings)) "")))
|
|
;; FIXME: We could also try to return unexpanded envvars.
|
|
(complete-with-action action table newstring pred))
|
|
(let* ((envpos (apply #'+ (mapcar #' length strings)))
|
|
(newstring
|
|
(mapconcat #'identity (nreverse (cons string strings)) ""))
|
|
(bounds (completion-boundaries newstring table pred
|
|
(or (cdr-safe action) ""))))
|
|
(if (>= (car bounds) envpos)
|
|
;; The env-var is "out of bounds".
|
|
(if (eq action t)
|
|
(complete-with-action action table newstring pred)
|
|
`(boundaries
|
|
,(+ (car bounds) (- orig-length (length newstring)))
|
|
. ,(cdr bounds)))
|
|
;; The env-var is in the file bounds.
|
|
(if (eq action t)
|
|
(let ((comps (complete-with-action
|
|
action table newstring pred))
|
|
(len (- envpos (car bounds))))
|
|
;; Strip the part of each completion that's actually
|
|
;; coming from the env-var.
|
|
(mapcar (lambda (s) (substring s len)) comps))
|
|
`(boundaries
|
|
,(+ envpos (- orig-length (length newstring)))
|
|
. ,(cdr bounds))))))))))
|
|
|
|
(defsubst pcomplete-all-entries (&optional regexp predicate)
|
|
"Like `pcomplete-entries', but doesn't ignore any entries."
|
|
(let (pcomplete-file-ignore
|
|
pcomplete-dir-ignore)
|
|
(pcomplete-entries regexp predicate)))
|
|
|
|
(defsubst pcomplete-dirs (&optional regexp)
|
|
"Complete amongst a list of directories."
|
|
(pcomplete-entries regexp #'file-directory-p))
|
|
|
|
;; generation of completion lists
|
|
|
|
(defun pcomplete-find-completion-function (command)
|
|
"Find the completion function to call for the given COMMAND."
|
|
(let ((sym (intern-soft
|
|
(concat "pcomplete/" (symbol-name major-mode) "/" command))))
|
|
(unless sym
|
|
(setq sym (intern-soft (concat "pcomplete/" command))))
|
|
(and sym (fboundp sym) sym)))
|
|
|
|
(defun pcomplete-completions ()
|
|
"Return a list of completions for the current argument position."
|
|
(catch 'pcomplete-completions
|
|
(when (pcomplete-parse-arguments pcomplete-expand-before-complete)
|
|
(if (= pcomplete-index pcomplete-last)
|
|
(funcall pcomplete-command-completion-function)
|
|
(let ((sym (or (pcomplete-find-completion-function
|
|
(funcall pcomplete-command-name-function))
|
|
pcomplete-default-completion-function)))
|
|
(ignore
|
|
(pcomplete-next-arg)
|
|
(funcall sym)))))))
|
|
|
|
(defun pcomplete-opt (options &optional prefix _no-ganging _args-follow)
|
|
"Complete a set of OPTIONS, each beginning with PREFIX (?- by default).
|
|
PREFIX may be t, in which case no PREFIX character is necessary.
|
|
If NO-GANGING is non-nil, each option is separate (-xy is not allowed).
|
|
If ARGS-FOLLOW is non-nil, then options which take arguments may have
|
|
the argument appear after a ganged set of options. This is how tar
|
|
behaves, for example.
|
|
Arguments NO-GANGING and ARGS-FOLLOW are currently ignored."
|
|
(if (and (= pcomplete-index pcomplete-last)
|
|
(string= (pcomplete-arg) "-"))
|
|
(let ((len (length options))
|
|
(index 0)
|
|
char choices)
|
|
(while (< index len)
|
|
(setq char (aref options index))
|
|
(if (eq char ?\()
|
|
(let ((result (read-from-string options index)))
|
|
(setq index (cdr result)))
|
|
(unless (memq char '(?/ ?* ?? ?.))
|
|
(push (char-to-string char) choices))
|
|
(setq index (1+ index))))
|
|
(throw 'pcomplete-completions
|
|
(mapcar
|
|
(lambda (opt)
|
|
(concat "-" opt))
|
|
(pcomplete-uniquify-list choices))))
|
|
(let ((arg (pcomplete-arg)))
|
|
(when (and (> (length arg) 1)
|
|
(stringp arg)
|
|
(eq (aref arg 0) (or prefix ?-)))
|
|
(pcomplete-next-arg)
|
|
(let ((char (aref arg 1))
|
|
(len (length options))
|
|
(index 0)
|
|
opt-char arg-char result)
|
|
(while (< (1+ index) len)
|
|
(setq opt-char (aref options index)
|
|
arg-char (aref options (1+ index)))
|
|
(if (eq arg-char ?\()
|
|
(setq result
|
|
(read-from-string options (1+ index))
|
|
index (cdr result)
|
|
result (car result))
|
|
(setq result nil))
|
|
(when (and (eq char opt-char)
|
|
(memq arg-char '(?\( ?/ ?* ?? ?.)))
|
|
(if (< pcomplete-index pcomplete-last)
|
|
(pcomplete-next-arg)
|
|
(throw 'pcomplete-completions
|
|
(cond ((eq arg-char ?/) (pcomplete-dirs))
|
|
((eq arg-char ?*) (pcomplete-executables))
|
|
((eq arg-char ??) nil)
|
|
((eq arg-char ?.) (pcomplete-entries))
|
|
((eq arg-char ?\() (eval result t))))))
|
|
(setq index (1+ index))))))))
|
|
|
|
(defun pcomplete--here (&optional form stub paring form-only)
|
|
"Complete against the current argument, if at the end.
|
|
See the documentation for `pcomplete-here'."
|
|
(if (< pcomplete-index pcomplete-last)
|
|
(progn
|
|
(if (eq paring 0)
|
|
(setq pcomplete-seen nil)
|
|
(unless (eq paring t)
|
|
(let ((arg (pcomplete-arg)))
|
|
(when (stringp arg)
|
|
(push (if paring
|
|
(funcall paring arg)
|
|
(file-truename arg))
|
|
pcomplete-seen)))))
|
|
(pcomplete-next-arg)
|
|
t)
|
|
(when pcomplete-show-help
|
|
(pcomplete--help)
|
|
(throw 'pcompleted t))
|
|
(if stub
|
|
(setq pcomplete-stub stub))
|
|
(if (or (eq paring t) (eq paring 0))
|
|
(setq pcomplete-seen nil)
|
|
(setq pcomplete-norm-func (or paring #'file-truename)))
|
|
(unless form-only
|
|
(run-hooks 'pcomplete-try-first-hook))
|
|
(throw 'pcomplete-completions
|
|
(if (functionp form)
|
|
(funcall form)
|
|
;; Old calling convention, might still be used by files
|
|
;; byte-compiled with the older code.
|
|
(eval form t)))))
|
|
|
|
|
|
(defmacro pcomplete-here* (&optional form stub form-only)
|
|
"An alternate form which does not participate in argument paring."
|
|
(declare (debug t))
|
|
`(pcomplete-here ,form ,stub t ,form-only))
|
|
|
|
;; display support
|
|
|
|
(defun pcomplete-restore-windows ()
|
|
"If the only window change was due to Completions, restore things."
|
|
(if pcomplete-last-window-config
|
|
(let* ((cbuf (get-buffer "*Completions*"))
|
|
(cwin (and cbuf (get-buffer-window cbuf))))
|
|
(when (window-live-p cwin)
|
|
(bury-buffer cbuf)
|
|
(set-window-configuration pcomplete-last-window-config))))
|
|
(setq pcomplete-last-window-config nil
|
|
pcomplete-window-restore-timer nil))
|
|
|
|
(define-obsolete-function-alias 'pcomplete-event-matches-key-specifier-p
|
|
#'eq "27.1")
|
|
|
|
(define-obsolete-function-alias 'pcomplete-read-event #'read-event "27.1")
|
|
|
|
(defun pcomplete-show-completions (completions)
|
|
"List in help buffer sorted COMPLETIONS.
|
|
Typing SPC flushes the help buffer."
|
|
(when pcomplete-window-restore-timer
|
|
(cancel-timer pcomplete-window-restore-timer)
|
|
(setq pcomplete-window-restore-timer nil))
|
|
(unless pcomplete-last-window-config
|
|
(setq pcomplete-last-window-config (current-window-configuration)))
|
|
(with-output-to-temp-buffer "*Completions*"
|
|
(display-completion-list completions))
|
|
(minibuffer-message "Hit space to flush")
|
|
(let (event)
|
|
(prog1
|
|
(catch 'done
|
|
(while (with-current-buffer (get-buffer "*Completions*")
|
|
(setq event (read-event)))
|
|
(cond
|
|
((eq event ?\s)
|
|
(set-window-configuration pcomplete-last-window-config)
|
|
(setq pcomplete-last-window-config nil)
|
|
(throw 'done nil))
|
|
((or (eq event 'tab)
|
|
;; Needed on a terminal
|
|
(eq event 9))
|
|
(let ((win (or (get-buffer-window "*Completions*" 0)
|
|
(display-buffer "*Completions*"
|
|
'not-this-window))))
|
|
(with-selected-window win
|
|
(if (pos-visible-in-window-p (point-max))
|
|
(goto-char (point-min))
|
|
(scroll-up))))
|
|
(message ""))
|
|
(t
|
|
(push event unread-command-events)
|
|
(throw 'done nil)))))
|
|
(if (and pcomplete-last-window-config
|
|
pcomplete-restore-window-delay)
|
|
(setq pcomplete-window-restore-timer
|
|
(run-with-timer pcomplete-restore-window-delay nil
|
|
#'pcomplete-restore-windows))))))
|
|
|
|
;; insert completion at point
|
|
|
|
(defun pcomplete-insert-entry (stub entry &optional addsuffix raw-p)
|
|
"Insert a completion entry at point.
|
|
Returns non-nil if a space was appended at the end."
|
|
(let ((here (point)))
|
|
(if (not completion-ignore-case)
|
|
(insert-and-inherit (if raw-p
|
|
(substring entry (length stub))
|
|
(comint-quote-filename
|
|
(substring entry (length stub)))))
|
|
;; the stub is not quoted at this time, so to determine the
|
|
;; length of what should be in the buffer, we must quote it
|
|
;; FIXME: Here we presume that quoting `stub' gives us the exact
|
|
;; text in the buffer before point, which is not guaranteed;
|
|
;; e.g. it is not the case in eshell when completing ${FOO}tm[TAB].
|
|
(delete-char (- (length (comint-quote-filename stub))))
|
|
;; if there is already a backslash present to handle the first
|
|
;; character, don't bother quoting it
|
|
(when (eq (char-before) ?\\)
|
|
(insert-and-inherit (substring entry 0 1))
|
|
(setq entry (substring entry 1)))
|
|
(insert-and-inherit (if raw-p
|
|
entry
|
|
(comint-quote-filename entry))))
|
|
(let (space-added)
|
|
(when (and (not (memq (char-before) pcomplete-suffix-list))
|
|
addsuffix)
|
|
(insert-and-inherit pcomplete-termination-string)
|
|
(setq space-added t))
|
|
(setq pcomplete-last-completion-length (- (point) here)
|
|
pcomplete-last-completion-stub stub)
|
|
space-added)))
|
|
|
|
;; Selection of completions.
|
|
|
|
(defun pcomplete-do-complete (stub completions)
|
|
"Dynamically complete at point using STUB and COMPLETIONS.
|
|
This is basically just a wrapper for `pcomplete-stub' which does some
|
|
extra checking, and munging of the COMPLETIONS list."
|
|
(unless (stringp stub)
|
|
(message "Cannot complete argument")
|
|
(throw 'pcompleted nil))
|
|
(if (null completions)
|
|
(ignore
|
|
(if (and stub (> (length stub) 0))
|
|
(message "No completions of %s" stub)
|
|
(message "No completions")))
|
|
;; pare it down, if applicable
|
|
(when (and pcomplete-use-paring pcomplete-seen)
|
|
(setq pcomplete-seen
|
|
(mapcar #'directory-file-name pcomplete-seen))
|
|
(dolist (p pcomplete-seen)
|
|
(add-to-list 'pcomplete-seen
|
|
(funcall pcomplete-norm-func p)))
|
|
(setq completions
|
|
(apply-partially #'completion-table-with-predicate
|
|
completions
|
|
(when pcomplete-seen
|
|
(lambda (f)
|
|
(not (member
|
|
(funcall pcomplete-norm-func
|
|
(directory-file-name f))
|
|
pcomplete-seen))))
|
|
'strict)))
|
|
;; OK, we've got a list of completions.
|
|
(if pcomplete-show-list
|
|
;; FIXME: pay attention to boundaries.
|
|
(pcomplete-show-completions (all-completions stub completions))
|
|
(pcomplete-stub stub completions))))
|
|
|
|
(defun pcomplete-stub (stub candidates &optional cycle-p)
|
|
"Dynamically complete STUB from CANDIDATES list.
|
|
This function inserts completion characters at point by completing
|
|
STUB from the strings in CANDIDATES. A completions listing may be
|
|
shown in a help buffer if completion is ambiguous.
|
|
|
|
Returns nil if no completion was inserted.
|
|
Returns `sole' if completed with the only completion match.
|
|
Returns `shortest' if completed with the shortest of the matches.
|
|
Returns `partial' if completed as far as possible with the matches.
|
|
Returns `listed' if a completion listing was shown.
|
|
|
|
See also `pcomplete-filename'."
|
|
(let* ((completion-ignore-case completion-ignore-case)
|
|
(completions (all-completions stub candidates))
|
|
(entry (try-completion stub candidates))
|
|
result)
|
|
(cond
|
|
((null entry)
|
|
(if (and stub (> (length stub) 0))
|
|
(message "No completions of %s" stub)
|
|
(message "No completions")))
|
|
((eq entry t)
|
|
(setq entry stub)
|
|
(message "Sole completion")
|
|
(setq result 'sole))
|
|
((= 1 (length completions))
|
|
(setq result 'sole))
|
|
((and pcomplete-cycle-completions
|
|
(or cycle-p
|
|
(not pcomplete-cycle-cutoff-length)
|
|
(<= (length completions)
|
|
pcomplete-cycle-cutoff-length)))
|
|
(let ((bound (car (completion-boundaries stub candidates nil ""))))
|
|
(unless (zerop bound)
|
|
(setq completions (mapcar (lambda (c) (concat (substring stub 0 bound) c))
|
|
completions)))
|
|
(setq entry (car completions)
|
|
pcomplete-current-completions completions)))
|
|
((and pcomplete-recexact
|
|
(string-equal stub entry)
|
|
(member entry completions))
|
|
;; It's not unique, but user wants shortest match.
|
|
(message "Completed shortest")
|
|
(setq result 'shortest))
|
|
((or pcomplete-autolist
|
|
(string-equal stub entry))
|
|
;; It's not unique, list possible completions.
|
|
;; FIXME: pay attention to boundaries.
|
|
(pcomplete-show-completions completions)
|
|
(setq result 'listed))
|
|
(t
|
|
(message "Partially completed")
|
|
(setq result 'partial)))
|
|
(cons result entry)))
|
|
|
|
;; context sensitive help
|
|
|
|
(defun pcomplete--help ()
|
|
"Produce context-sensitive help for the current argument.
|
|
If specific documentation can't be given, be generic."
|
|
(if (and pcomplete-help
|
|
(or (and (stringp pcomplete-help)
|
|
(fboundp 'Info-goto-node))
|
|
(listp pcomplete-help)))
|
|
(if (listp pcomplete-help)
|
|
(message "%s" (eval pcomplete-help t))
|
|
(save-window-excursion (info))
|
|
(declare-function Info-goto-node
|
|
"info" (nodename &optional fork strict-case))
|
|
(switch-to-buffer-other-window "*info*")
|
|
(funcall #'Info-goto-node pcomplete-help))
|
|
(if pcomplete-man-function
|
|
(let ((cmd (funcall pcomplete-command-name-function)))
|
|
(if (and cmd (> (length cmd) 0))
|
|
(funcall pcomplete-man-function cmd)))
|
|
(message "No context-sensitive help available"))))
|
|
|
|
;; general utilities
|
|
|
|
(defun pcomplete-uniquify-list (l)
|
|
"Sort and remove multiples in L."
|
|
(setq l (sort l #'string-lessp))
|
|
(seq-uniq l))
|
|
(define-obsolete-function-alias 'pcomplete-uniqify-list #'pcomplete-uniquify-list "27.1")
|
|
|
|
(defun pcomplete-process-result (cmd &rest args)
|
|
"Call CMD using `call-process' and return the simplest result."
|
|
(with-temp-buffer
|
|
(apply #'call-process cmd nil t nil args)
|
|
(skip-chars-backward "\n")
|
|
(buffer-substring (point-min) (point))))
|
|
|
|
;; hostname completion
|
|
|
|
(defvar pcomplete--host-name-cache nil
|
|
"A cache the names of frequently accessed hosts.")
|
|
|
|
(defvar pcomplete--host-name-cache-timestamp nil
|
|
"A timestamp of when the hosts file was read.")
|
|
|
|
(defun pcomplete-read-hosts-file (filename)
|
|
"Read in the hosts from FILENAME, default `pcomplete-hosts-file'."
|
|
(let (hosts)
|
|
(with-temp-buffer
|
|
(insert-file-contents (or filename pcomplete-hosts-file))
|
|
(goto-char (point-min))
|
|
(while (re-search-forward
|
|
;; "^ \t\\([^# \t\n]+\\)[ \t]+\\([^ \t\n]+\\)\\([ \t]*\\([^ \t\n]+\\)\\)?"
|
|
"^[ \t]*\\([^# \t\n]+\\)[ \t]+\\([^ \t\n].+\\)" nil t)
|
|
(push (cons (match-string 1)
|
|
(split-string (match-string 2)))
|
|
hosts)))
|
|
(nreverse hosts)))
|
|
|
|
(defun pcomplete-read-hosts (file result-var timestamp-var)
|
|
"Read the contents of /etc/hosts for host names."
|
|
(if (or (not (symbol-value result-var))
|
|
(not (symbol-value timestamp-var))
|
|
(time-less-p
|
|
(symbol-value timestamp-var)
|
|
(file-attribute-modification-time (file-attributes file))))
|
|
(progn
|
|
(set result-var (apply #'nconc (pcomplete-read-hosts-file file)))
|
|
(set timestamp-var (current-time))))
|
|
(symbol-value result-var))
|
|
|
|
(defun pcomplete-read-host-names ()
|
|
"Read the contents of /etc/hosts for host names."
|
|
(if pcomplete-hosts-file
|
|
(pcomplete-read-hosts pcomplete-hosts-file 'pcomplete--host-name-cache
|
|
'pcomplete--host-name-cache-timestamp)))
|
|
|
|
(provide 'pcomplete)
|
|
|
|
;;; pcomplete.el ends here
|