code.delx.au - gnu-emacs-elpa/blob - company-files.el

   1 ;;; company-files.el --- company-mode completion back-end for file paths
   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 (defun company-files--directory-files (dir prefix)
  32   (ignore-errors
  33     (if (equal prefix "")
  34         (directory-files dir nil "\\`[^.]\\|\\`.[^.]")
  35       (file-name-all-completions prefix dir))))
  36
  37 (defvar company-files--regexps
  38   (let* ((root (if (eq system-type 'windows-nt)
  39                    "[a-zA-Z]:/"
  40                  "/"))
  41          (begin (concat "\\(?:\\.\\{1,2\\}/\\|~/\\|" root "\\)")))
  42     (list (concat "\"\\(" begin "[^\"\n]*\\)")
  43           (concat "\'\\(" begin "[^\'\n]*\\)")
  44           (concat "\\(?:[ \t]\\|^\\)\\(" begin "[^ \t\n]*\\)"))))
  45
  46 (defun company-files--grab-existing-name ()
  47   ;; Grab the file name.
  48   ;; When surrounded with quotes, it can include spaces.
  49   (let (file dir)
  50     (and (cl-dolist (regexp company-files--regexps)
  51            (when (setq file (company-grab-line regexp 1))
  52              (cl-return file)))
  53          (or (not (file-remote-p file))
  54              (file-remote-p file nil t))
  55          (setq dir (file-name-directory file))
  56          (not (string-match "//" dir))
  57          (file-exists-p dir)
  58          (file-name-all-completions (file-name-nondirectory file) dir)
  59          file)))
  60
  61 (defvar company-files--completion-cache nil)
  62
  63 (defun company-files--complete (prefix)
  64   (let* ((dir (file-name-directory prefix))
  65          (key (list (file-name-nondirectory prefix)
  66                     (expand-file-name dir)
  67                     (nth 5 (file-attributes dir))))
  68          (file (file-name-nondirectory prefix))
  69          (completion-ignore-case read-file-name-completion-ignore-case)
  70          candidates directories)
  71     (unless (company-file--keys-match-p key (car company-files--completion-cache))
  72       (dolist (file (company-files--directory-files dir file))
  73         (setq file (concat dir file))
  74         (push file candidates)
  75         (when (file-directory-p file)
  76           (push file directories)))
  77       (dolist (directory (reverse directories))
  78         ;; Add one level of children.
  79         (dolist (child (company-files--directory-files directory ""))
  80           (push (concat directory
  81                         (unless (eq (aref directory (1- (length directory))) ?/) "/")
  82                         child) candidates)))
  83       (setq company-files--completion-cache (cons key (nreverse candidates))))
  84     (all-completions prefix
  85                      (cdr company-files--completion-cache))))
  86
  87 (defun company-file--keys-match-p (new old)
  88   (and (equal (cdr old) (cdr new))
  89        (string-prefix-p (car old) (car new))))
  90
  91 ;;;###autoload
  92 (defun company-files (command &optional arg &rest ignored)
  93   "`company-mode' completion back-end existing file names.
  94 Completions works for proper absolute and relative files paths.
  95 File paths with spaces are only supported inside strings."
  96   (interactive (list 'interactive))
  97   (cl-case command
  98     (interactive (company-begin-backend 'company-files))
  99     (prefix (company-files--grab-existing-name))
 100     (candidates (company-files--complete arg))
 101     (location (cons (dired-noselect
 102                      (file-name-directory (directory-file-name arg))) 1))
 103     (sorted t)
 104     (no-cache t)))
 105
 106 (provide 'company-files)
 107 ;;; company-files.el ends here