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;;; desktop-registry.el --- Keep a central registry of desktop files -*- lexical-binding: t -*-
;; Copyright (C) 2013 Tom Willemse
;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords: convenience
;; Version: 1.1.0
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This module provides functions and a global minor mode that lets
;; you track a central registry of desktop files. This is useful when
;; you use desktop files as project files and want to be able to
;; switch between them quickly.
(require 'desktop)
;;; Code:
(defgroup desktop-registry nil
"Customization group for desktop-registry."
:group 'desktop
:prefix 'desktop-registry)
(defcustom desktop-registry-registry nil
"The registry of desktop files."
:group 'desktop-registry
:type '(repeat (cons string directory)))
(defvar desktop-registry--history nil
"History variable for `desktop-registry'.")
(defun desktop-registry--canonicalize-dir (dir)
"Canonicalize DIR for use."
(directory-file-name (expand-file-name dir)))
;;;###autoload
(defun desktop-registry-current-desktop (&optional default)
"Get the name of the currently loaded desktop.
Returns DEFAULT when `desktop-dirname' is nil."
(if desktop-dirname
(let ((canonical
(desktop-registry--canonicalize-dir desktop-dirname)))
(car (cl-find-if (lambda (d) (equal (cdr d) canonical))
desktop-registry-registry)))
default))
;;;###autoload
(defun desktop-registry-add-directory (dir &optional name)
"Add DIR to the desktop registry, possibly using NAME."
(interactive (list (read-directory-name "Directory: ")
(if (equal current-prefix-arg '(4))
(read-string "Name: "))))
(let* ((clean-dir (desktop-registry--canonicalize-dir dir))
(label (or name (file-name-base clean-dir))))
(cond
((cl-find clean-dir desktop-registry-registry
:key 'cdr :test 'equal)
(message "Directory %s already registered" clean-dir))
((cl-find label desktop-registry-registry :key 'car :test 'equal)
(error "Name %s already used" label))
(t (customize-save-variable
'desktop-registry-registry
(cons (cons label clean-dir) desktop-registry-registry))))))
;;;###autoload
(defun desktop-registry-add-current-desktop (&optional name)
"Add the currently opened desktop file to `desktop-registry-registry'.
If NAME is specified use that as the name for the registry entry."
(interactive (list (if (equal current-prefix-arg '(4))
(read-string "Name: "))))
(unless desktop-dirname
(error "No desktop loaded"))
(desktop-registry-add-directory desktop-dirname name))
(defun desktop-registry--completing-read (&optional prompt
default-current)
"Ask the user to pick a desktop directory.
PROMPT specifies the prompt to use when asking, which defaults to
\"Desktop: \". DEFAULT-CURRENT specifies whether to use the
current desktop as default value."
(let ((prompt (or prompt "Desktop: "))
(default (and default-current
(desktop-registry-current-desktop))))
(completing-read prompt desktop-registry-registry nil nil nil
'desktop-registry--history default)))
;;;###autoload
(defun desktop-registry-remove-desktop (desktop)
"Remove DESKTOP from the desktop registry."
(interactive (list (desktop-registry--completing-read "Remove: " t)))
(let ((spec (assoc desktop desktop-registry-registry)))
(if spec
(customize-save-variable
'desktop-registry-registry
(delete spec desktop-registry-registry))
(error "Unknown desktop: %s" desktop))))
;;;###autoload
(defun desktop-registry-rename-desktop (old new)
"Rename desktop OLD to NEW."
(interactive (list (desktop-registry--completing-read "Rename: " t)
(read-string "to: ")))
(let ((spec (assoc old desktop-registry-registry)))
(if (not spec)
(error "Unknown desktop: %s" old)
(setf (car spec) new)
(customize-save-variable 'desktop-registry-registry
desktop-registry-registry))))
;;;###autoload
(defun desktop-registry-change-desktop (name)
"Change to the desktop named NAME."
(interactive (list (desktop-registry--completing-read "Switch to: ")))
(desktop-change-dir (cdr (assoc name desktop-registry-registry))))
;;;###autoload
(define-minor-mode desktop-registry-auto-register
"Automatically add saved desktops to the registry."
:global t
(if desktop-registry-auto-register
(add-hook 'desktop-save-hook
'desktop-registry-add-current-desktop)
(remove-hook 'desktop-save-hook
'desktop-registry-add-current-desktop)))
(provide 'desktop-registry)
;;; desktop-registry.el ends here
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