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

   1 ;;; company-files.el --- company-mode completion back-end for file names
   2
   3 ;; Copyright (C) 2009-2011, 2013  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* ((begin (if (eq system-type 'windows-nt)
  39                     "[a-zA-Z]:/"
  40                   "/"))
  41          (begin (concat "\\(?:\\.\\{1,2\\}/\\|~/\\|" begin "\\)")))
  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 file names with spaces, only when they include quotes.
  48   (let (file dir)
  49     (and (cl-dolist (regexp company-files-regexps)
  50            (when (setq file (company-grab-line regexp 1))
  51              (cl-return file)))
  52          (setq dir (file-name-directory file))
  53          (not (string-match "//" dir))
  54          (file-exists-p dir)
  55          (file-name-all-completions (file-name-nondirectory file) dir)
  56          file)))
  57
  58 (defvar company-files-completion-cache nil)
  59
  60 (defun company-files-complete (prefix)
  61   (let* ((dir (file-name-directory prefix))
  62          (dir-exp (expand-file-name dir))
  63          (file (file-name-nondirectory prefix))
  64          candidates directories)
  65     (unless (equal dir-exp (car company-files-completion-cache))
  66       (dolist (file (company-files-directory-files dir file))
  67         (setq file (concat dir file))
  68         (push file candidates)
  69         (when (file-directory-p file)
  70           (push file directories)))
  71       (dolist (directory (reverse directories))
  72         ;; Add one level of children.
  73         (dolist (child (company-files-directory-files directory ""))
  74           (push (concat directory
  75                         (unless (eq (aref directory (1- (length directory))) ?/) "/")
  76                         child) candidates)))
  77       (setq company-files-completion-cache (cons dir-exp (nreverse candidates))))
  78     (all-completions prefix
  79                      (cdr company-files-completion-cache))))
  80
  81 ;;;###autoload
  82 (defun company-files (command &optional arg &rest ignored)
  83   "`company-mode' completion back-end existing file names.
  84 Completions are triggered when the text inside quotes starts with any of
  85 the following: ./, ../, ~/, or root drive"
  86   (interactive (list 'interactive))
  87   (cl-case command
  88     (interactive (company-begin-backend 'company-files))
  89     (prefix (company-files-grab-existing-name))
  90     (candidates (company-files-complete arg))
  91     (location (cons (dired-noselect
  92                      (file-name-directory (directory-file-name arg))) 1))
  93     (sorted t)
  94     (no-cache t)))
  95
  96 (provide 'company-files)
  97 ;;; company-files.el ends here