lisp/pcmpl-linux.el

   1 ;;; pcmpl-linux.el --- functions for dealing with GNU/Linux completions
   2
   3 ;; Copyright (C) 1999-2013 Free Software Foundation, Inc.
   4
   5 ;; Package: pcomplete
   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 ;;; Commentary:
  23
  24 ;; These functions are for use with GNU/Linux.  Since they depend on a
  25 ;; certain knowledge of the layout of such systems, they probably
  26 ;; won't work very well on other operating systems.
  27
  28 ;;; Code:
  29
  30 (provide 'pcmpl-linux)
  31
  32 (require 'pcomplete)
  33
  34 (defgroup pcmpl-linux nil
  35   "Functions for dealing with GNU/Linux completions."
  36   :group 'pcomplete)
  37
  38 ;; Functions:
  39
  40 ;;;###autoload
  41 (defun pcomplete/kill ()
  42   "Completion for GNU/Linux `kill', using /proc filesystem."
  43   (if (pcomplete-match "^-\\(.*\\)" 0)
  44       (pcomplete-here
  45        (pcomplete-uniqify-list
  46         (split-string
  47          (pcomplete-process-result "kill" "-l")))
  48        (pcomplete-match-string 1 0)))
  49   (while (pcomplete-here
  50           (if (file-directory-p "/proc")
  51               (directory-files "/proc" nil "\\`[0-9]+\\'"))
  52           nil 'identity)))
  53
  54 ;;;###autoload
  55 (defun pcomplete/umount ()
  56   "Completion for GNU/Linux `umount'."
  57   (pcomplete-opt "hVafrnvt(pcmpl-linux-fs-types)")
  58   (while (pcomplete-here (pcmpl-linux-mounted-directories)
  59                          nil 'identity)))
  60
  61 ;;;###autoload
  62 (defun pcomplete/mount ()
  63   "Completion for GNU/Linux `mount'."
  64   (pcomplete-opt "hVanfFrsvwt(pcmpl-linux-fs-types)o?L?U?")
  65   (while (pcomplete-here (pcomplete-entries) nil 'identity)))
  66
  67 (defun pcmpl-linux-fs-types ()
  68   "Return a list of available fs modules on GNU/Linux systems."
  69   (let ((kernel-ver (pcomplete-process-result "uname" "-r")))
  70     (directory-files
  71      (concat "/lib/modules/" kernel-ver "/kernel/fs/"))))
  72
  73 (defun pcmpl-linux-mounted-directories ()
  74   "Return a list of mounted directory names."
  75   (let (points)
  76     (when (file-readable-p "/etc/mtab")
  77       (with-temp-buffer
  78         (insert-file-contents-literally "/etc/mtab")
  79         (while (not (eobp))
  80           (let* ((line (buffer-substring (point) (line-end-position)))
  81                  (args (split-string line " ")))
  82             (setq points (cons (nth 1 args) points)))
  83           (forward-line)))
  84       (pcomplete-uniqify-list points))))
  85
  86 (defun pcomplete-pare-list (l r)
  87   "Destructively remove from list L all elements matching any in list R.
  88 Test is done using `equal'."
  89   (while (and l (and r (member (car l) r)))
  90     (setq l (cdr l)))
  91   (let ((m l))
  92     (while m
  93       (while (and (cdr m)
  94                   (and r (member (cadr m) r)))
  95         (setcdr m (cddr m)))
  96       (setq m (cdr m))))
  97   l)
  98
  99 (defun pcmpl-linux-mountable-directories ()
 100   "Return a list of mountable directory names."
 101   (let (points)
 102     (when (file-readable-p "/etc/fstab")
 103       (with-temp-buffer
 104         (insert-file-contents-literally "/etc/fstab")
 105         (while (not (eobp))
 106           (let* ((line (buffer-substring (point) (line-end-position)))
 107                  (args (split-string line "\\s-+")))
 108             (setq points (cons (nth 1 args) points)))
 109           (forward-line)))
 110       (pcomplete-pare-list
 111        (pcomplete-uniqify-list points)
 112        (cons "swap" (pcmpl-linux-mounted-directories))))))
 113
 114 ;;; pcmpl-linux.el ends here