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2018-11-21 e75a20334813452c6912c090d70a0de2c805f94d

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5cb5f7	1	;;; company-files.el --- company-mode completion backend for file names
C	2
	3	;; Copyright (C) 2009-2011, 2014-2015 Free Software Foundation, Inc.
	4
	5	;; Author: Nikolaj Schumacher
	6
	7	;; This file is part of GNU Emacs.
	8
	9	;; GNU Emacs is free software: you can redistribute it and/or modify
	10	;; it under the terms of the GNU General Public License as published by
	11	;; the Free Software Foundation, either version 3 of the License, or
	12	;; (at your option) any later version.
	13
	14	;; GNU Emacs is distributed in the hope that it will be useful,
	15	;; but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	;; GNU General Public License for more details.
	18
	19	;; You should have received a copy of the GNU General Public License
	20	;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
	21
	22
	23	;;; Commentary:
	24	;;
	25
	26	;;; Code:
	27
	28	(require 'company)
	29	(require 'cl-lib)
	30
	31	(defgroup company-files nil
	32	"Completion backend for file names."
	33	:group 'company)
	34
	35	(defcustom company-files-exclusions nil
	36	"File name extensions and directory names to ignore.
	37	The values should use the same format as `completion-ignored-extensions'."
	38	:type '(const string)
	39	:package-version '(company . "0.9.1"))
	40
	41	(defun company-files--directory-files (dir prefix)
	42	;; Don't use directory-files. It produces directories without trailing /.
	43	(condition-case err
	44	(let ((comp (sort (file-name-all-completions prefix dir)
	45	(lambda (s1 s2) (string-lessp (downcase s1) (downcase s2))))))
	46	(when company-files-exclusions
	47	(setq comp (company-files--exclusions-filtered comp)))
	48	(if (equal prefix "")
	49	(delete "../" (delete "./" comp))
	50	comp))
	51	(file-error nil)))
	52
	53	(defun company-files--exclusions-filtered (completions)
	54	(let* ((dir-exclusions (cl-delete-if-not #'company-files--trailing-slash-p
	55	company-files-exclusions))
	56	(file-exclusions (cl-set-difference company-files-exclusions
	57	dir-exclusions)))
	58	(cl-loop for c in completions
	59	unless (if (company-files--trailing-slash-p c)
	60	(member c dir-exclusions)
	61	(cl-find-if (lambda (exclusion)
	62	(string-suffix-p exclusion c))
	63	file-exclusions))
	64	collect c)))
	65
	66	(defvar company-files--regexps
	67	(let* ((root (if (eq system-type 'windows-nt)
	68	"[a-zA-Z]:/"
	69	"/"))
	70	(begin (concat "\\(?:\\.\\{1,2\\}/\\\|~/\\\|" root "\\)")))
	71	(list (concat "\"\\(" begin "[^\"\n]*\\)")
	72	(concat "\'\\(" begin "[^\'\n]*\\)")
	73	(concat "\\(?:[ \t=]\\\|^\\)\\(" begin "[^ \t\n]*\\)"))))
	74
	75	(defun company-files--grab-existing-name ()
	76	;; Grab the file name.
	77	;; When surrounded with quotes, it can include spaces.
	78	(let (file dir)
	79	(and (cl-dolist (regexp company-files--regexps)
	80	(when (setq file (company-grab-line regexp 1))
	81	(cl-return file)))
	82	(company-files--connected-p file)
	83	(setq dir (file-name-directory file))
	84	(not (string-match "//" dir))
	85	(file-exists-p dir)
	86	file)))
	87
	88	(defun company-files--connected-p (file)
	89	(or (not (file-remote-p file))
	90	(file-remote-p file nil t)))
	91
	92	(defun company-files--trailing-slash-p (file)
	93	;; `file-directory-p' is very expensive on remotes. We are relying on
	94	;; `file-name-all-completions' returning directories with trailing / instead.
	95	(let ((len (length file)))
	96	(and (> len 0) (eq (aref file (1- len)) ?/))))
	97
	98	(defvar company-files--completion-cache nil)
	99
	100	(defun company-files--complete (prefix)
	101	(let* ((dir (file-name-directory prefix))
	102	(file (file-name-nondirectory prefix))
	103	(key (list file
	104	(expand-file-name dir)
	105	(nth 5 (file-attributes dir))))
	106	(completion-ignore-case read-file-name-completion-ignore-case))
	107	(unless (company-file--keys-match-p key (car company-files--completion-cache))
	108	(let* ((candidates (mapcar (lambda (f) (concat dir f))
	109	(company-files--directory-files dir file)))
	110	(directories (unless (file-remote-p dir)
	111	(cl-remove-if-not (lambda (f)
	112	(and (company-files--trailing-slash-p f)
	113	(not (file-remote-p f))
	114	(company-files--connected-p f)))
	115	candidates)))
	116	(children (and directories
	117	(cl-mapcan (lambda (d)
	118	(mapcar (lambda (c) (concat d c))
	119	(company-files--directory-files d "")))
	120	directories))))
	121	(setq company-files--completion-cache
	122	(cons key (append candidates children)))))
	123	(all-completions prefix
	124	(cdr company-files--completion-cache))))
	125
	126	(defun company-file--keys-match-p (new old)
	127	(and (equal (cdr old) (cdr new))
	128	(string-prefix-p (car old) (car new))))
	129
	130	;;;###autoload
	131	(defun company-files (command &optional arg &rest ignored)
	132	"`company-mode' completion backend existing file names.
	133	Completions works for proper absolute and relative files paths.
	134	File paths with spaces are only supported inside strings."
	135	(interactive (list 'interactive))
	136	(cl-case command
	137	(interactive (company-begin-backend 'company-files))
	138	(prefix (company-files--grab-existing-name))
	139	(candidates (company-files--complete arg))
	140	(location (cons (dired-noselect
	141	(file-name-directory (directory-file-name arg))) 1))
	142	(post-completion (when (company-files--trailing-slash-p arg)
	143	(delete-char -1)))
	144	(sorted t)
	145	(no-cache t)))
	146
	147	(provide 'company-files)
	148	;;; company-files.el ends here