;;; company-dabbrev.el --- dabbrev-like company-mode completion backend -*- lexical-binding: t -*-
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;; Copyright (C) 2009, 2011, 2014, 2015, 2016 Free Software Foundation, Inc.
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;; Author: Nikolaj Schumacher
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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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;;
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;;; Code:
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(require 'company)
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(require 'cl-lib)
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(defgroup company-dabbrev nil
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"dabbrev-like completion backend."
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:group 'company)
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(defcustom company-dabbrev-other-buffers 'all
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"Determines whether `company-dabbrev' should search other buffers.
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If `all', search all other buffers, except the ignored ones. If t, search
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buffers with the same major mode. See also `company-dabbrev-time-limit'."
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:type '(choice (const :tag "Off" nil)
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(const :tag "Same major mode" t)
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(const :tag "All" all)))
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(defcustom company-dabbrev-ignore-buffers "\\`[ *]"
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"Regexp matching the names of buffers to ignore.
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Or a function that returns non-nil for such buffers."
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:type '(choice (regexp :tag "Regexp")
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(function :tag "Predicate"))
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:package-version '(company . "0.9.0"))
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(defcustom company-dabbrev-time-limit .1
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"Determines how many seconds `company-dabbrev' should look for matches."
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:type '(choice (const :tag "Off" nil)
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(number :tag "Seconds")))
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(defcustom company-dabbrev-char-regexp "\\sw"
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"A regular expression matching the characters `company-dabbrev' looks for."
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:type 'regexp)
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(defcustom company-dabbrev-ignore-case 'keep-prefix
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"Non-nil to ignore case when collecting completion candidates.
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When it's `keep-prefix', the text before point will remain unchanged after
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candidate is inserted, even some of its characters have different case."
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:type '(choice
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(const :tag "Don't ignore case" nil)
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(const :tag "Ignore case" t)
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(const :tag "Keep case before point" keep-prefix)))
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(defcustom company-dabbrev-downcase 'case-replace
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"Whether to downcase the returned candidates.
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The value of nil means keep them as-is.
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`case-replace' means use the value of `case-replace'.
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Any other value means downcase.
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If you set this value to nil, you may also want to set
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`company-dabbrev-ignore-case' to any value other than `keep-prefix'."
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:type '(choice
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(const :tag "Keep as-is" nil)
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(const :tag "Downcase" t)
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(const :tag "Use case-replace" case-replace)))
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(defcustom company-dabbrev-minimum-length 4
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"The minimum length for the completion candidate to be included.
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This variable affects both `company-dabbrev' and `company-dabbrev-code'."
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:type 'integer
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:package-version '(company . "0.8.3"))
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(defcustom company-dabbrev-ignore-invisible nil
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"Non-nil to skip invisible text."
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:type 'boolean
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:package-version '(company . "0.9.0"))
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(defmacro company-dabbrev--time-limit-while (test start limit freq &rest body)
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(declare (indent 3) (debug t))
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`(let ((company-time-limit-while-counter 0))
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(catch 'done
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(while ,test
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,@body
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(and ,limit
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(= (cl-incf company-time-limit-while-counter) ,freq)
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(setq company-time-limit-while-counter 0)
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(> (float-time (time-since ,start)) ,limit)
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(throw 'done 'company-time-out))))))
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(defun company-dabbrev--make-regexp ()
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(concat "\\(?:" company-dabbrev-char-regexp "\\)+"))
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(defun company-dabbrev--search-buffer (regexp pos symbols start limit
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ignore-comments)
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(save-excursion
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(cl-labels ((maybe-collect-match
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()
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(let ((match (match-string-no-properties 0)))
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(when (and (>= (length match) company-dabbrev-minimum-length)
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(not (and company-dabbrev-ignore-invisible
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(invisible-p (match-beginning 0)))))
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(push match symbols)))))
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(goto-char (if pos (1- pos) (point-min)))
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;; Search before pos.
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(let ((tmp-end (point)))
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(company-dabbrev--time-limit-while (and (not (input-pending-p))
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(> tmp-end (point-min)))
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start limit 1
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(ignore-errors
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(forward-char -10000))
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(forward-line 0)
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(save-excursion
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;; Before, we used backward search, but it matches non-greedily, and
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;; that forced us to use the "beginning/end of word" anchors in
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;; `company-dabbrev--make-regexp'. It's also about 2x slower.
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(while (and (not (input-pending-p))
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(re-search-forward regexp tmp-end t))
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(if (and ignore-comments (save-match-data (company-in-string-or-comment)))
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(re-search-forward "\\s>\\|\\s!\\|\\s\"" tmp-end t)
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(maybe-collect-match))))
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(setq tmp-end (point))))
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(goto-char (or pos (point-min)))
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;; Search after pos.
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(company-dabbrev--time-limit-while (and (not (input-pending-p))
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(re-search-forward regexp nil t))
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start limit 25
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(if (and ignore-comments (save-match-data (company-in-string-or-comment)))
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(re-search-forward "\\s>\\|\\s!\\|\\s\"" nil t)
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(maybe-collect-match)))
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symbols)))
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(defun company-dabbrev--search (regexp &optional limit other-buffer-modes
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ignore-comments)
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(let* ((start (current-time))
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(symbols (company-dabbrev--search-buffer regexp (point) nil start limit
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ignore-comments)))
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(when other-buffer-modes
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(cl-dolist (buffer (delq (current-buffer) (buffer-list)))
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(unless (if (stringp company-dabbrev-ignore-buffers)
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(string-match-p company-dabbrev-ignore-buffers
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(buffer-name buffer))
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(funcall company-dabbrev-ignore-buffers buffer))
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(with-current-buffer buffer
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(when (or (eq other-buffer-modes 'all)
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(apply #'derived-mode-p other-buffer-modes))
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(setq symbols
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(company-dabbrev--search-buffer regexp nil symbols start
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limit ignore-comments)))))
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(and limit
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(> (float-time (time-since start)) limit)
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(cl-return))))
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symbols))
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(defun company-dabbrev--prefix ()
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;; Not in the middle of a word.
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(unless (looking-at company-dabbrev-char-regexp)
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;; Emacs can't do greedy backward-search.
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(company-grab-line (format "\\(?:^\\| \\)[^ ]*?\\(\\(?:%s\\)*\\)"
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company-dabbrev-char-regexp)
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1)))
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(defun company-dabbrev--filter (prefix candidates)
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(let ((completion-ignore-case company-dabbrev-ignore-case))
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(all-completions prefix candidates)))
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;;;###autoload
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(defun company-dabbrev (command &optional arg &rest ignored)
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"dabbrev-like `company-mode' completion backend."
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(interactive (list 'interactive))
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(cl-case command
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(interactive (company-begin-backend 'company-dabbrev))
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(prefix (company-dabbrev--prefix))
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(candidates
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(let* ((case-fold-search company-dabbrev-ignore-case)
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(words (company-dabbrev--search (company-dabbrev--make-regexp)
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company-dabbrev-time-limit
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(pcase company-dabbrev-other-buffers
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(`t (list major-mode))
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(`all `all))))
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(downcase-p (if (eq company-dabbrev-downcase 'case-replace)
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case-replace
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company-dabbrev-downcase)))
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(setq words (company-dabbrev--filter arg words))
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(if downcase-p
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(mapcar 'downcase words)
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words)))
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(ignore-case company-dabbrev-ignore-case)
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(duplicates t)))
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(provide 'company-dabbrev)
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;;; company-dabbrev.el ends here
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