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;;; sunrise-x-popviewer.el --- floating viewer window for the Sunrise Commander -*- lexical-binding: t -*-
;; Copyright (C) 2008-2012 José Alfredo Romero L.
;; Author: José Alfredo Romero L. <escherdragon@gmail.com>
;; Štěpán Němec <stepnem@gmail.com>
;; Maintainer: José Alfredo Romero L. <escherdragon@gmail.com>
;; Created: 20 Aug 2008
;; Version: 3
;; RCS Version: $Rev: 444 $
;; Keywords: sunrise commander, windows, accessibility, viewer
;; URL: http://www.emacswiki.org/emacs/sunrise-x-popviewer.el
;; Compatibility: GNU Emacs 22+
;; This file is not part of GNU Emacs.
;; 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 de-
;; tails.
;; 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 extension advises several Sunrise Commander functions in order to make
;; the viewer window "float", i.e. instead of having a dedicated window sitting
;; under the panes all the time, a new frame is displayed whenever the user
;; requests to view a file (by pressing "o" or "v") or to open a command line in
;; the current directory.
;; WARNING: This code and the Buttons extension (sunrise-x-buttons) do NOT mix
;; together, if you're using the Buttons extension remove it first from your
;; .emacs file.
;;; Installation and Usage:
;; 1) Put this file somewhere in your Emacs `load-path'.
;; 2) If you are currently using the Buttons extension (sunrise-x-buttons),
;; remove it first from your .emacs file.
;; 2) Add a (require 'sunrise-x-popviewer) expression to your .emacs file
;; somewhere after the (require 'sunrise-commander) one.
;; 3) Evaluate the new expression, or reload your .emacs file, or restart Emacs.
;; 4) Use `sr-popviewer-mode' to toggle the functionality.
;; 5) The next time you invoke the Sunrise Commander, only two panes will be
;; displayed. If you press o (or v) on a file inside any of them, it will be
;; displayed in a new frame. If you press C-c t to open a terminal in the
;; current directory, it'll be opened in a new frame too.
;; 6) Enjoy ;-)
;;; Code:
(require 'sunrise-commander)
(eval-when-compile (require 'cl))
(defcustom sr-popviewer-enabled nil
"Whether the popviewer extension should be active at startup."
:group 'sunrise
:type 'boolean)
(defcustom sr-popviewer-style 'dedicated-frames
"Determines the way frames are used for quick viewing files:
* Single Frame: reuse the same frame whenever possible.
* Single Dedicated Frame: reuse and close frame when its last buffer is killed.
* Multiple Frames: use a new frame for every new file (or terminal) displayed.
* Dedicated Frames: use a new frame and close it whenever its buffer is killed."
:group 'sunrise
:type '(choice
(const single-frame)
(const single-dedicated-frame)
(const multiple-frames)
(const dedicated-frames)))
(defcustom sr-popviewer-select-viewer-action nil
"Alternative function for selecting a viewer window"
:group 'sunrise
:type 'function)
(defvar sr-popviewer-frame-name "Sunrise Viewer"
"Name of the frame being currently used as the viewer.")
(defun sr-popviewer-setup-windows ()
"`sr-setup-windows' replacement for `sr-popviewer-mode'."
(interactive)
(bury-buffer)
(delete-other-windows)
(case sr-window-split-style
(horizontal (split-window-horizontally))
(vertical (split-window-vertically))
(top (ignore))
(t (error "Sunrise: don't know how to split this window: %s" sr-window-split-style)))
(sr-setup-visible-panes)
(sr-select-window sr-selected-window)
(sr-restore-panes-width)
(setq other-window-scroll-buffer nil)
(run-hooks 'sr-start-hook))
(defadvice sr-setup-windows
(around sr-popviewer-advice-setup-windows)
"Set up the Sunrise window configuration (two windows in `sr-mode')."
(sr-popviewer-setup-windows))
(defun sr-popviewer-get-frame ()
"Return the frame being currently used as the viewer, if any."
(cdr (assoc sr-popviewer-frame-name (make-frame-names-alist))))
(defun sr-popviewer-pop-frame ()
"Bring forward the viewer frame, create a new one if necessary."
(let* ((vframe (sr-popviewer-get-frame)) (target-frame))
(when vframe
(select-frame vframe)
(if (memq sr-popviewer-style '(single-frame single-dedicated-frame))
(setq target-frame vframe)
(set-frame-name (buffer-name))))
(unless target-frame
(setq other-window-scroll-buffer nil)
(setq target-frame (make-frame `((name . ,sr-popviewer-frame-name)))))
(select-frame target-frame)
(raise-frame)))
(defun sr-popviewer-dedicate-frame ()
"Take care of dedicating the current window as to its frame, if necessary."
(let ((vframe (sr-popviewer-get-frame)))
(when vframe
(select-frame vframe)
(set-window-dedicated-p
(frame-first-window vframe)
(memq sr-popviewer-style '(single-dedicated-frame dedicated-frames))))
(add-hook
'kill-buffer-hook (lambda () (sr-select-window sr-selected-window)) t t)))
(defun sr-popviewer-quick-view (&optional arg)
"Quickly view the currently selected item.
On regular files, it opens the file in a separate frame, on
directories visits the selected directory in the passive pane,
and on symlinks follows the file the link points to in the
passive pane."
(interactive "P")
(setq
other-window-scroll-buffer
(let ((other-window-scroll-buffer
(if (memq sr-popviewer-style '(single-frame single-dedicated-frame))
other-window-scroll-buffer
nil)))
(sr-quick-view arg)
(sr-popviewer-dedicate-frame)
other-window-scroll-buffer)))
(defadvice sr-term
(around sr-popviewer-advice-term (&optional cd newterm program))
"Make terminal windows dedicated when using multiple viewers."
(let ((sr-popviewer-style (if (or newterm program)
sr-popviewer-style
'single-frame)))
ad-do-it)
(sr-popviewer-dedicate-frame))
(defun sr-popviewer-select-viewer-window ()
"Popviewer replacement for `sr-select-viewer-window'."
(interactive)
(cond (sr-popviewer-select-viewer-action
(funcall sr-popviewer-select-viewer-action))
((null window-system) (other-window 1))
(t (sr-popviewer-pop-frame))))
(defadvice sr-select-viewer-window
(around sr-popviewer-advice-select-viewer-window)
"Try to select a window that is not a SC pane in a separate frame."
(sr-popviewer-select-viewer-window))
(defadvice sunrise-cd
(around sr-popviewer-advice-sunrise-cd (&optional norestore))
"Redefine `sunrise-cd' not to disable Sunrise in PopViewer mode."
(if sr-running
(sr-popviewer-setup-windows)
ad-do-it))
(define-minor-mode sr-popviewer-mode "Use an alternative viewer window."
:global t
:group 'sunrise
:lighter ""
(let ((hookfun (if sr-popviewer-mode 'remove-hook 'add-hook))
(adfun (if sr-popviewer-mode 'sr-ad-enable 'sr-ad-disable))
(viewerfun (if sr-popviewer-mode
'sr-popviewer-select-viewer-window
'sr-select-viewer-window))
(quickviewfun (if sr-popviewer-mode
'sr-popviewer-quick-view
'sr-quick-view))
(panelockfun (if sr-popviewer-mode
'sr-popviewer-setup-windows
'sr-lock-panes)))
(funcall hookfun 'window-size-change-functions 'sr-lock-window)
(define-key sr-mode-map "o" quickviewfun)
(define-key sr-mode-map "v" quickviewfun)
(define-key sr-mode-map "\C-c\t" viewerfun)
(define-key sr-mode-map [(control tab)] viewerfun)
(define-key sr-mode-map "\\" panelockfun)
(funcall adfun "^sr-popviewer-")
(if sr-running (sr-setup-windows))))
(defun sunrise-x-popviewer-unload-function ()
(sr-popviewer-mode -1)
(sr-ad-disable "^sr-popviewer-"))
(sr-popviewer-mode (if sr-popviewer-enabled 1 -1))
(provide 'sunrise-x-popviewer)
;;;###autoload (eval-after-load 'sunrise-commander '(sr-extend-with 'sunrise-x-popviewer))
;;; sunrise-x-popviewer.el ends here
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