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;;; lui-track-bar.el --- Provides a bar to track the last read position
;; Copyright (C) 2016 Vasilij Schneidermann <v.schneidermann@gmail.com>
;; Author: Vasilij Schneidermann <v.schneidermann@gmail.com>
;; This file is part of LUI.
;; 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, write to the Free Software
;; Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
;; 02110-1301 USA
;;; Commentary:
;; This allows you to track where you've last left off a buffer.
;; Use (enable-lui-track-bar) to enable this mode globally. You can
;; customize `lui-track-bar-behavior' to change when the track bar
;; moves. You can also use M-x lui-track-bar-move to move the track
;; bar manually.
;;; Code:
(require 'lui)
(require 'tracking)
(defgroup lui-track-bar nil
"Last read position tracking for LUI"
:prefix "lui-track-bar-"
:group 'lui)
(defcustom lui-track-bar-behavior 'before-switch-to-buffer
"When to move the track bar.
The following values are possible.
before-switch-to-buffer (default)
Move the bar to the bottom of the buffer when switching away
from a buffer.
before-tracking-next-buffer
Move the bar when switching to the next buffer using
\\[tracking-next-buffer].
after-send
Move the bar after sending a message."
:type '(choice (const :tag "Before switching buffers"
before-switch-to-buffer)
(const :tag "Before tracking switch"
before-tracking-next-buffer)
(const :tag "After sending"
after-send))
:group 'lui-track-bar)
(defface lui-track-bar
'((((type graphic) (background light))
:inherit default :background "dim gray" :height 0.1)
(((type graphic) (background dark))
:inherit default :background "light gray" :height 0.1)
(((type tty))
:inherit (font-lock-comment-face default) :underline t))
"Track bar face"
:group 'lui-track-bar)
(defvar lui-track-bar-overlay nil)
(make-variable-buffer-local 'lui-track-bar-overlay)
;;;###autoload
(defun enable-lui-track-bar ()
"Enable a bar in Lui buffers that shows where you stopped reading."
(interactive)
(defadvice switch-to-buffer (before lui-track-bar activate)
(when (and (eq lui-track-bar-behavior 'before-switch-to-buffer)
;; Do not move the bar if the buffer is displayed still
(<= (length (get-buffer-window-list (current-buffer)))
1))
(lui-track-bar-move)))
(defadvice tracking-next-buffer (before lui-track-bar activate)
(when (eq lui-track-bar-behavior 'before-tracking-next-buffer)
(lui-track-bar-move)))
(add-hook 'lui-pre-input-hook 'lui-track-bar--move-pre-input))
(defun lui-track-bar--move-pre-input ()
(when (eq lui-track-bar-behavior 'after-send)
(lui-track-bar-move)))
(defun lui-track-bar-move ()
"Move the track bar down."
(interactive)
(when (derived-mode-p 'lui-mode)
(when (not lui-track-bar-overlay)
(setq lui-track-bar-overlay (make-overlay (point-min) (point-min)))
(overlay-put lui-track-bar-overlay 'after-string
(propertize "\n" 'face 'lui-track-bar)))
(move-overlay lui-track-bar-overlay
lui-output-marker lui-output-marker)))
(provide 'lui-track-bar)
;;; lui-track-bar.el ends here
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