2014-01-01 13:43:14 +00:00
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;;; vlf-follow.el --- VLF chunk follows point functionality -*- lexical-binding: t -*-
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;; Copyright (C) 2014 Free Software Foundation, Inc.
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;; Keywords: large files, follow, recenter
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;; Author: Andrey Kotlarski <m00naticus@gmail.com>
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;; URL: https://github.com/m00natic/vlfi
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;; This file is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; any later version.
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;; This file is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This package provides `vlf-toggle-follow' command which toggles
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;; continuous recenter of chunk around current point.
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;;; Code:
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2014-01-07 11:38:24 +00:00
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(require 'vlf)
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2014-01-01 13:43:14 +00:00
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(defvar vlf-follow-timer nil
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"Contains timer if vlf buffer is set to continuously recenter.")
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2014-01-06 23:43:14 +00:00
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(make-variable-buffer-local 'vlf-follow-timer)
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2014-01-01 13:43:14 +00:00
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(put 'vlf-follow-timer 'permanent-local t)
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(defun vlf-recenter (vlf-buffer)
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"Recenter chunk around current point in VLF-BUFFER."
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(and vlf-follow-timer
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(eq (current-buffer) vlf-buffer)
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(or (pos-visible-in-window-p (point-min))
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(pos-visible-in-window-p (point-max)))
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(let ((current-pos (+ vlf-start-pos (position-bytes (point))))
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(half-batch (/ vlf-batch-size 2)))
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(if (buffer-modified-p)
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(progn
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(let ((edit-end (+ (position-bytes (point-max))
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vlf-start-pos)))
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(vlf-move-to-chunk (min vlf-start-pos
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(- current-pos half-batch))
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(max edit-end
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(+ current-pos half-batch))))
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(goto-char (byte-to-position (- current-pos
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vlf-start-pos))))
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(vlf-move-to-batch (- current-pos half-batch))
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(and (< half-batch current-pos)
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(< half-batch (- vlf-file-size current-pos))
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(goto-char (byte-to-position (- current-pos
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vlf-start-pos))))))))
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(defun vlf-stop-follow ()
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"Stop continuous recenter."
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2014-01-06 23:43:14 +00:00
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(when vlf-follow-timer
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(cancel-timer vlf-follow-timer)
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(setq vlf-follow-timer nil)))
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2014-01-01 13:43:14 +00:00
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(defun vlf-start-follow (interval)
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"Continuously recenter chunk around point every INTERVAL seconds."
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(setq vlf-follow-timer (run-with-idle-timer interval interval
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'vlf-recenter
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(current-buffer)))
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(add-hook 'kill-buffer-hook 'vlf-stop-follow nil t))
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(defun vlf-toggle-follow ()
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"Toggle continuous chunk recenter around current point."
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(interactive)
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(if vlf-mode
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(if vlf-follow-timer
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(progn (vlf-stop-follow)
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(message "Following stopped"))
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(vlf-start-follow (read-number "Number of seconds: " 1)))))
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(provide 'vlf-follow)
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;;; vlf-follow.el ends here
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