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;;; pcmpl-linux.el --- functions for dealing with GNU/Linux completions -*- lexical-binding: t -*-
;; Copyright (C) 1999-2021 Free Software Foundation, Inc.
;; Package: pcomplete
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; These functions are for use with GNU/Linux. Since they depend on a
;; certain knowledge of the layout of such systems, they probably
;; won't work very well on other operating systems.
;;; Code:
(provide 'pcmpl-linux)
(require 'pcomplete)
;; Functions:
;;;###autoload
(defun pcomplete/kill ()
"Completion for GNU/Linux `kill', using /proc filesystem."
(if (pcomplete-match "^-\\(.*\\)" 0)
(pcomplete-here
(pcomplete-uniquify-list
(split-string
(pcomplete-process-result "kill" "-l")))
(pcomplete-match-string 1 0)))
(while (pcomplete-here
(if (file-directory-p "/proc")
(directory-files "/proc" nil "\\`[0-9]+\\'"))
nil #'identity)))
;;;###autoload
(defun pcomplete/umount ()
"Completion for GNU/Linux `umount'."
(pcomplete-opt "hVafrnvt(pcmpl-linux-fs-types)")
(while (pcomplete-here (pcmpl-linux-mounted-directories)
nil #'identity)))
;;;###autoload
(defun pcomplete/mount ()
"Completion for GNU/Linux `mount'."
(pcomplete-opt "hVanfFrsvwt(pcmpl-linux-fs-types)o?L?U?")
(while (pcomplete-here (pcomplete-entries) nil #'identity)))
(defconst pcmpl-linux-fs-modules-path-format "/lib/modules/%s/kernel/fs/")
(defun pcmpl-linux-fs-types ()
"Return a list of available fs modules on GNU/Linux systems."
(let ((kernel-ver (pcomplete-process-result "uname" "-r")))
(directory-files
(format pcmpl-linux-fs-modules-path-format kernel-ver))))
(defconst pcmpl-linux-mtab-file "/etc/mtab")
(defun pcmpl-linux-mounted-directories ()
"Return a list of mounted directory names."
(let (points)
(when (file-readable-p pcmpl-linux-mtab-file)
(with-temp-buffer
(insert-file-contents-literally pcmpl-linux-mtab-file)
(while (not (eobp))
(let* ((line (buffer-substring (point) (line-end-position)))
(args (split-string line " ")))
(setq points (cons (nth 1 args) points)))
(forward-line)))
(pcomplete-uniquify-list points))))
(defun pcomplete-pare-list (l r)
"Destructively remove from list L all elements matching any in list R.
Test is done using `equal'."
(while (and l (and r (member (car l) r)))
(setq l (cdr l)))
(let ((m l))
(while m
(while (and (cdr m)
(and r (member (cadr m) r)))
(setcdr m (cddr m)))
(setq m (cdr m))))
l)
(defun pcmpl-linux-mountable-directories ()
"Return a list of mountable directory names."
(let (points)
(when (file-readable-p "/etc/fstab")
(with-temp-buffer
(insert-file-contents-literally "/etc/fstab")
(while (not (eobp))
(let* ((line (buffer-substring (point) (line-end-position)))
(args (split-string line "\\s-+")))
(setq points (cons (nth 1 args) points)))
(forward-line)))
(pcomplete-pare-list
(pcomplete-uniquify-list points)
(cons "swap" (pcmpl-linux-mounted-directories))))))
;;; pcmpl-linux.el ends here
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