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  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          (setq dir (file-name-directory file))
  54          (not (string-match "//" dir))
  55          (file-exists-p dir)
  56          (file-name-all-completions (file-name-nondirectory file) dir)
  57          file)))
  58
  59 (defvar company-files--completion-cache nil)
  60
  61 (defun company-files--complete (prefix)
  62   (let* ((dir (file-name-directory prefix))
  63          (key (list (file-name-nondirectory prefix)
  64                     (expand-file-name dir)
  65                     (nth 5 (file-attributes dir))))
  66          (file (file-name-nondirectory prefix))
  67          candidates directories)
  68     (unless (company-file--keys-match-p key (car company-files--completion-cache))
  69       (dolist (file (company-files--directory-files dir file))
  70         (setq file (concat dir file))
  71         (push file candidates)
  72         (when (file-directory-p file)
  73           (push file directories)))
  74       (dolist (directory (reverse directories))
  75         ;; Add one level of children.
  76         (dolist (child (company-files--directory-files directory ""))
  77           (push (concat directory
  78                         (unless (eq (aref directory (1- (length directory))) ?/) "/")
  79                         child) candidates)))
  80       (setq company-files--completion-cache (cons key (nreverse candidates))))
  81     (all-completions prefix
  82                      (cdr company-files--completion-cache))))
  83
  84 (defun company-file--keys-match-p (new old)
  85   (and (string-prefix-p (car old) (car new))
  86        (equal (cdr old) (cdr new))))
  87
  88 ;;;###autoload
  89 (defun company-files (command &optional arg &rest ignored)
  90   "`company-mode' completion back-end existing file names.
  91 Completions works for proper absolute and relative files paths.
  92 File paths with spaces are only supported inside strings."
  93   (interactive (list 'interactive))
  94   (cl-case command
  95     (interactive (company-begin-backend 'company-files))
  96     (prefix (company-files--grab-existing-name))
  97     (candidates (company-files--complete arg))
  98     (location (cons (dired-noselect
  99                      (file-name-directory (directory-file-name arg))) 1))
 100     (sorted t)
 101     (no-cache t)))
 102
 103 (provide 'company-files)
 104 ;;; company-files.el ends here