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Break VLF into components.
This commit is contained in:
Andrey Kotlarski
13
README.org
13
README.org
@@ -36,8 +36,8 @@ editing, search and indexing.
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** 32-bit GNU Emacs
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Regular Emacs integers are used, so if you use 32-bit Emacs without
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bignum support and have really huge file (with size beyond the maximum
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integer value), VLF will probably not quite work.
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bignum support, VLF will not work with files over 512 MB (maximum
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integer value).
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** Memory control
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@@ -98,13 +98,8 @@ the end.
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** Follow point
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Intelligent continuous recenter around point in current buffer can be
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enabled with:
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*M-x vlf-start-following*
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You are asked for number of idle seconds interval for automatic
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update. To cancel following invoke *M-x vlf-stop-following*.
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Continuous chunk recenter around point in current buffer can be
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toggled with *C-c C-v f*.
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** Search whole file
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328
vlf-base.el
Normal file
328
vlf-base.el
Normal file
@@ -0,0 +1,328 @@
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;;; vlf-base.el --- VLF primitive operations -*- lexical-binding: t -*-
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;; Copyright (C) 2014 Free Software Foundation, Inc.
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;; Keywords: large files, chunk
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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 basic chunk operations for VLF
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;;; Code:
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(defconst vlf-min-chunk-size 16
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"Minimal number of bytes that can be properly decoded.")
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(defconst vlf-partial-decode-shown
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(cond ((< emacs-major-version 24) t)
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((< 24 emacs-major-version) nil)
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(t ;; TODO: use (< emacs-minor-version 4) after 24.4 release
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(string-lessp emacs-version "24.3.5")))
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"Indicates whether partial decode codes are displayed.")
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(defun vlf-move-to-chunk (start end &optional minimal)
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"Move to chunk determined by START END.
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When given MINIMAL flag, skip non important operations.
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If same as current chunk is requested, do nothing.
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Return number of bytes moved back for proper decoding and number of
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bytes added to the end."
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(unless (and (= start vlf-start-pos)
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(= end vlf-end-pos))
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(vlf-verify-size)
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(let ((shifts (vlf-move-to-chunk-1 start end)))
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(and shifts (not minimal)
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(vlf-update-buffer-name))
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shifts)))
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(defun vlf-move-to-chunk-1 (start end)
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"Move to chunk determined by START END keeping as much edits if any.
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Return number of bytes moved back for proper decoding and number of
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bytes added to the end."
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(let* ((modified (buffer-modified-p))
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(start (max 0 start))
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(end (min end vlf-file-size))
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(edit-end (if modified
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(+ vlf-start-pos
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(length (encode-coding-region
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(point-min) (point-max)
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buffer-file-coding-system t)))
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vlf-end-pos)))
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(cond
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((and (= start vlf-start-pos) (= end edit-end))
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(or modified (vlf-move-to-chunk-2 start end)))
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((or (<= edit-end start) (<= end vlf-start-pos))
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(when (or (not modified)
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(y-or-n-p "Chunk modified, are you sure? ")) ;full chunk renewal
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(set-buffer-modified-p nil)
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(vlf-move-to-chunk-2 start end)))
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((or (and (<= start vlf-start-pos) (<= edit-end end))
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(not modified)
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(y-or-n-p "Chunk modified, are you sure? "))
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(let ((shift-start 0)
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(shift-end 0))
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(let ((pos (+ (position-bytes (point)) vlf-start-pos))
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(inhibit-read-only t))
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(cond ((< end edit-end)
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(let* ((del-pos (1+ (byte-to-position
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(- end vlf-start-pos))))
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(del-len (length (encode-coding-region
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del-pos (point-max)
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buffer-file-coding-system
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t))))
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(setq end (- (if (zerop vlf-end-pos)
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vlf-file-size
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vlf-end-pos)
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del-len))
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(vlf-with-undo-disabled
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(delete-region del-pos (point-max)))))
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((< edit-end end)
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(if (and (not vlf-partial-decode-shown)
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(< (- end vlf-end-pos) 4))
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(setq end vlf-end-pos)
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(vlf-with-undo-disabled
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(setq shift-end (cdr (vlf-insert-file-contents
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vlf-end-pos end nil t
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(point-max))))))))
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(cond ((< vlf-start-pos start)
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(let* ((del-pos (1+ (byte-to-position
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(- start vlf-start-pos))))
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(del-len (length (encode-coding-region
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(point-min) del-pos
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buffer-file-coding-system
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t))))
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(setq start (+ vlf-start-pos del-len))
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(vlf-with-undo-disabled
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(delete-region (point-min) del-pos))
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(vlf-shift-undo-list (- 1 del-pos))))
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((< start vlf-start-pos)
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(if (and (not vlf-partial-decode-shown)
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(< (- vlf-start-pos start) 4))
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(setq start vlf-start-pos)
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(let ((edit-end-pos (point-max)))
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(vlf-with-undo-disabled
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(setq shift-start (car (vlf-insert-file-contents
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start vlf-start-pos
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t nil edit-end-pos)))
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(goto-char (point-min))
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(insert (delete-and-extract-region
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edit-end-pos (point-max))))
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(vlf-shift-undo-list (- (point-max) edit-end-pos))))))
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(setq start (- start shift-start))
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(goto-char (or (byte-to-position (- pos start))
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(byte-to-position (- pos vlf-start-pos))
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(point-max)))
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(setq vlf-start-pos start
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vlf-end-pos (+ end shift-end)))
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(set-buffer-modified-p modified)
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(cons shift-start shift-end))))))
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(defun vlf-move-to-chunk-2 (start end)
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"Unconditionally move to chunk determined by START END.
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Return number of bytes moved back for proper decoding and number of
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bytes added to the end."
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(setq vlf-start-pos (max 0 start)
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vlf-end-pos (min end vlf-file-size))
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(let (shifts)
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(let ((inhibit-read-only t)
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(pos (position-bytes (point))))
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(vlf-with-undo-disabled
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(erase-buffer)
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(setq shifts (vlf-insert-file-contents vlf-start-pos
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vlf-end-pos t t)
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vlf-start-pos (- vlf-start-pos (car shifts))
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vlf-end-pos (+ vlf-end-pos (cdr shifts)))
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(goto-char (or (byte-to-position (+ pos (car shifts)))
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(point-max)))))
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(set-buffer-modified-p nil)
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(setq buffer-undo-list nil)
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(set-visited-file-modtime)
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shifts))
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(defun vlf-insert-file-contents (start end adjust-start adjust-end
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&optional position)
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"Adjust chunk at absolute START to END till content can be\
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properly decoded. ADJUST-START determines if trying to prepend bytes\
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to the beginning, ADJUST-END - append to the end.
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Use buffer POSITION as start if given.
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Return number of bytes moved back for proper decoding and number of
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bytes added to the end."
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(setq adjust-start (and adjust-start (not (zerop start)))
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adjust-end (and adjust-end (< end vlf-file-size))
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position (or position (point-min)))
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(let ((shift-start 0)
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(shift-end 0))
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(if adjust-start
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(setq shift-start (vlf-adjust-start start end position
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adjust-end)
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start (- start shift-start))
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(setq shift-end (vlf-insert-content-safe start end position)
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end (+ end shift-end)))
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(if adjust-end
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(setq shift-end (+ shift-end
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(vlf-adjust-end start end position))))
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(cons shift-start shift-end)))
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(defun vlf-adjust-start (start end position adjust-end)
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"Adjust chunk beginning at absolute START to END till content can\
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be properly decoded. Use buffer POSITION as start.
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ADJUST-END is non-nil if end would be adjusted later.
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Return number of bytes moved back for proper decoding."
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(let* ((min-end (min end (+ start vlf-min-chunk-size)))
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(chunk-size (- min-end start))
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(strict (and (not adjust-end) (= min-end end)))
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(shift (vlf-insert-content-safe start min-end position t)))
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(setq start (- start shift))
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(while (and (not (zerop start))
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(< shift 3)
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(let ((diff (- chunk-size
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(length
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(encode-coding-region
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position (point-max)
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buffer-file-coding-system t)))))
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(cond (strict (not (zerop diff)))
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(vlf-partial-decode-shown
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(or (< diff -3) (< 0 diff)))
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(t (or (< diff 0) (< 3 diff))))))
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(setq shift (1+ shift)
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start (1- start)
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chunk-size (1+ chunk-size))
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(delete-region position (point-max))
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(insert-file-contents buffer-file-name nil start min-end))
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(unless (= min-end end)
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(delete-region position (point-max))
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(insert-file-contents buffer-file-name nil start end))
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shift))
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(defun vlf-adjust-end (start end position)
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"Adjust chunk end at absolute START to END till content can be\
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properly decoded starting at POSITION.
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Return number of bytes added for proper decoding."
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(let ((shift 0))
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(if vlf-partial-decode-shown
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(let ((new-pos (max position
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(- (point-max) vlf-min-chunk-size))))
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(if (< position new-pos)
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(setq start (+ start (length (encode-coding-region
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position new-pos
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buffer-file-coding-system
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t)))
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position new-pos))))
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(let ((chunk-size (- end start)))
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(goto-char (point-max))
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(while (and (< shift 3)
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(< end vlf-file-size)
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(or (eq (char-charset (preceding-char)) 'eight-bit)
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(/= chunk-size
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(length (encode-coding-region
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position (point-max)
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buffer-file-coding-system t)))))
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(setq shift (1+ shift)
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end (1+ end)
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chunk-size (1+ chunk-size))
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(delete-region position (point-max))
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(insert-file-contents buffer-file-name nil start end)
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(goto-char (point-max))))
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shift))
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(defun vlf-insert-content-safe (start end position &optional shift-start)
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"Insert file content from absolute START to END of file at\
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POSITION. Adjust start if SHIFT-START is non nil, end otherwise.
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Clean up if no characters are inserted."
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(goto-char position)
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(let ((shift 0))
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(while (and (< shift 3)
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(zerop (cadr (insert-file-contents buffer-file-name
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nil start end)))
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(if shift-start
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(not (zerop start))
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(< end vlf-file-size)))
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;; TODO: this seems like regression after Emacs 24.3
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(message "Buffer content may be broken")
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(setq shift (1+ shift))
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(if shift-start
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(setq start (1- start))
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(setq end (1+ end)))
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(delete-region position (point-max)))
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shift))
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(defun vlf-shift-undo-list (n)
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"Shift undo list element regions by N."
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(or (eq buffer-undo-list t)
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(setq buffer-undo-list
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(nreverse
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(let ((min (point-min))
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undo-list)
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(catch 'end
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(dolist (el buffer-undo-list undo-list)
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(push
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(cond
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((null el) nil)
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((numberp el) (let ((pos (+ el n)))
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(if (< pos min)
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(throw 'end undo-list)
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pos)))
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(t (let ((head (car el)))
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(cond ((numberp head)
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(let ((beg (+ head n)))
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(if (< beg min)
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(throw 'end undo-list)
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(cons beg (+ (cdr el) n)))))
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((stringp head)
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(let* ((pos (cdr el))
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(positive (< 0 pos))
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(new (+ (abs pos) n)))
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(if (< new min)
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(throw 'end undo-list)
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(cons head (if positive
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new
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(- new))))))
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((null head)
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(let ((beg (+ (nth 3 el) n)))
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(if (< beg min)
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(throw 'end undo-list)
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(cons
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nil
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(cons
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(cadr el)
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(cons
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(nth 2 el)
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(cons beg
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(+ (cddr
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(cddr el)) n))))))))
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((and (eq head 'apply)
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(numberp (cadr el)))
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(let ((beg (+ (nth 2 el) n)))
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(if (< beg min)
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(throw 'end undo-list)
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(cons
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'apply
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(cons
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(cadr el)
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(cons
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beg
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||||
(cons
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(+ (nth 3 el) n)
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(cons (nth 4 el)
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(cdr (last el))))))))))
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(t el)))))
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undo-list))))))))
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(provide 'vlf-base)
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;;; vlf-base.el ends here
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81
vlf-follow.el
Normal file
81
vlf-follow.el
Normal file
@@ -0,0 +1,81 @@
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;;; vlf-follow.el --- VLF chunk follows point functionality -*- lexical-binding: t -*-
|
||||
|
||||
;; Copyright (C) 2014 Free Software Foundation, Inc.
|
||||
|
||||
;; Keywords: large files, follow, recenter
|
||||
;; Author: Andrey Kotlarski <m00naticus@gmail.com>
|
||||
;; URL: https://github.com/m00natic/vlfi
|
||||
|
||||
;; This file 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, or (at your option)
|
||||
;; any later version.
|
||||
|
||||
;; This file 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; see the file COPYING. If not, write to
|
||||
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||||
;; Boston, MA 02111-1307, USA.
|
||||
|
||||
;;; Commentary:
|
||||
;; This package provides `vlf-toggle-follow' command which toggles
|
||||
;; continuous recenter of chunk around current point.
|
||||
|
||||
;;; Code:
|
||||
|
||||
(defvar vlf-follow-timer nil
|
||||
"Contains timer if vlf buffer is set to continuously recenter.")
|
||||
(put 'vlf-follow-timer 'permanent-local t)
|
||||
|
||||
(defun vlf-recenter (vlf-buffer)
|
||||
"Recenter chunk around current point in VLF-BUFFER."
|
||||
(and vlf-follow-timer
|
||||
(eq (current-buffer) vlf-buffer)
|
||||
(or (pos-visible-in-window-p (point-min))
|
||||
(pos-visible-in-window-p (point-max)))
|
||||
(let ((current-pos (+ vlf-start-pos (position-bytes (point))))
|
||||
(half-batch (/ vlf-batch-size 2)))
|
||||
(if (buffer-modified-p)
|
||||
(progn
|
||||
(let ((edit-end (+ (position-bytes (point-max))
|
||||
vlf-start-pos)))
|
||||
(vlf-move-to-chunk (min vlf-start-pos
|
||||
(- current-pos half-batch))
|
||||
(max edit-end
|
||||
(+ current-pos half-batch))))
|
||||
(goto-char (byte-to-position (- current-pos
|
||||
vlf-start-pos))))
|
||||
(vlf-move-to-batch (- current-pos half-batch))
|
||||
(and (< half-batch current-pos)
|
||||
(< half-batch (- vlf-file-size current-pos))
|
||||
(goto-char (byte-to-position (- current-pos
|
||||
vlf-start-pos))))))))
|
||||
|
||||
(defun vlf-stop-follow ()
|
||||
"Stop continuous recenter."
|
||||
(cancel-timer vlf-follow-timer)
|
||||
(setq vlf-follow-timer nil))
|
||||
|
||||
(defun vlf-start-follow (interval)
|
||||
"Continuously recenter chunk around point every INTERVAL seconds."
|
||||
(setq vlf-follow-timer (run-with-idle-timer interval interval
|
||||
'vlf-recenter
|
||||
(current-buffer)))
|
||||
(add-hook 'kill-buffer-hook 'vlf-stop-follow nil t))
|
||||
|
||||
(defun vlf-toggle-follow ()
|
||||
"Toggle continuous chunk recenter around current point."
|
||||
(interactive)
|
||||
(if vlf-mode
|
||||
(if vlf-follow-timer
|
||||
(progn (vlf-stop-follow)
|
||||
(message "Following stopped"))
|
||||
(vlf-start-follow (read-number "Number of seconds: " 1)))))
|
||||
|
||||
(provide 'vlf-follow)
|
||||
|
||||
;;; vlf-follow.el ends here
|
||||
151
vlf-integrate.el
Normal file
151
vlf-integrate.el
Normal file
@@ -0,0 +1,151 @@
|
||||
;;; vlf-integrate.el --- VLF integration with other packages -*- lexical-binding: t -*-
|
||||
|
||||
;; Copyright (C) 2014 Free Software Foundation, Inc.
|
||||
|
||||
;; Keywords: large files, integration
|
||||
;; Author: Andrey Kotlarski <m00naticus@gmail.com>
|
||||
;; URL: https://github.com/m00natic/vlfi
|
||||
|
||||
;; This file 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, or (at your option)
|
||||
;; any later version.
|
||||
|
||||
;; This file 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; see the file COPYING. If not, write to
|
||||
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||||
;; Boston, MA 02111-1307, USA.
|
||||
|
||||
;;; Commentary:
|
||||
;; This package enables VLF play seamlessly with rest of Emacs.
|
||||
|
||||
;;; Code:
|
||||
|
||||
(defgroup vlf nil
|
||||
"View Large Files in Emacs."
|
||||
:prefix "vlf-"
|
||||
:group 'files)
|
||||
|
||||
(defcustom vlf-application 'ask
|
||||
"Determines when `vlf' will be offered on opening files.
|
||||
Possible values are: nil to never use it;
|
||||
`ask' offer `vlf' when file size is beyond `large-file-warning-threshold';
|
||||
`dont-ask' automatically use `vlf' for large files;
|
||||
`always' use `vlf' for all files."
|
||||
:group 'vlf
|
||||
:type '(radio (const :format "%v " nil)
|
||||
(const :format "%v " ask)
|
||||
(const :format "%v " dont-ask)
|
||||
(const :format "%v" always)))
|
||||
|
||||
(defcustom vlf-forbidden-modes-list
|
||||
'(archive-mode tar-mode jka-compr git-commit-mode image-mode
|
||||
doc-view-mode doc-view-mode-maybe ebrowse-tree-mode)
|
||||
"Major modes which VLF will not be automatically applied to."
|
||||
:group 'vlf
|
||||
:type '(list symbol))
|
||||
|
||||
(unless (fboundp 'file-size-human-readable)
|
||||
(defun file-size-human-readable (file-size)
|
||||
"Print FILE-SIZE in MB."
|
||||
(format "%.3fMB" (/ file-size 1048576.0))))
|
||||
|
||||
(defun vlf-determine-major-mode (filename)
|
||||
"Determine major mode from FILENAME."
|
||||
(let ((name filename)
|
||||
(remote-id (file-remote-p filename))
|
||||
mode)
|
||||
;; Remove backup-suffixes from file name.
|
||||
(setq name (file-name-sans-versions name))
|
||||
;; Remove remote file name identification.
|
||||
(and (stringp remote-id)
|
||||
(string-match (regexp-quote remote-id) name)
|
||||
(setq name (substring name (match-end 0))))
|
||||
(setq mode
|
||||
(if (memq system-type '(windows-nt cygwin))
|
||||
;; System is case-insensitive.
|
||||
(let ((case-fold-search t))
|
||||
(assoc-default name auto-mode-alist 'string-match))
|
||||
;; System is case-sensitive.
|
||||
(or ;; First match case-sensitively.
|
||||
(let ((case-fold-search nil))
|
||||
(assoc-default name auto-mode-alist 'string-match))
|
||||
;; Fallback to case-insensitive match.
|
||||
(and auto-mode-case-fold
|
||||
(let ((case-fold-search t))
|
||||
(assoc-default name auto-mode-alist
|
||||
'string-match))))))
|
||||
(if (and mode (consp mode))
|
||||
(cadr mode)
|
||||
mode)))
|
||||
|
||||
(defadvice abort-if-file-too-large (around vlf-if-file-too-large
|
||||
compile activate)
|
||||
"If file SIZE larger than `large-file-warning-threshold', \
|
||||
allow user to view file with `vlf', open it normally, or abort.
|
||||
OP-TYPE specifies the file operation being performed over FILENAME."
|
||||
(cond
|
||||
((or (not size) (zerop size)))
|
||||
((or (not vlf-application)
|
||||
(not filename)
|
||||
(memq (vlf-determine-major-mode filename)
|
||||
vlf-forbidden-modes-list))
|
||||
ad-do-it)
|
||||
((eq vlf-application 'always)
|
||||
(vlf filename)
|
||||
(error ""))
|
||||
((and large-file-warning-threshold
|
||||
(< large-file-warning-threshold size))
|
||||
(if (eq vlf-application 'dont-ask)
|
||||
(progn (vlf filename)
|
||||
(error ""))
|
||||
(let ((char nil))
|
||||
(while (not (memq (setq char
|
||||
(read-event
|
||||
(propertize
|
||||
(format
|
||||
"File %s is large (%s): \
|
||||
%s normally (o), %s with vlf (v) or abort (a)"
|
||||
(if filename
|
||||
(file-name-nondirectory filename)
|
||||
"")
|
||||
(file-size-human-readable size)
|
||||
op-type op-type)
|
||||
'face 'minibuffer-prompt)))
|
||||
'(?o ?O ?v ?V ?a ?A))))
|
||||
(cond ((memq char '(?v ?V))
|
||||
(vlf filename)
|
||||
(error ""))
|
||||
((memq char '(?a ?A))
|
||||
(error "Aborted"))))))))
|
||||
|
||||
(eval-after-load "etags"
|
||||
'(progn
|
||||
(defadvice tags-verify-table (around vlf-tags-verify-table
|
||||
compile activate)
|
||||
"Temporarily disable `vlf-mode'."
|
||||
(let ((vlf-application nil))
|
||||
ad-do-it))
|
||||
|
||||
(defadvice tag-find-file-of-tag-noselect
|
||||
(around vlf-tag-find-file-of-tag compile activate)
|
||||
"Temporarily disable `vlf-mode'."
|
||||
(let ((vlf-application nil))
|
||||
ad-do-it))))
|
||||
|
||||
(defun dired-vlf ()
|
||||
"In Dired, visit the file on this line in VLF mode."
|
||||
(interactive)
|
||||
(vlf (dired-get-file-for-visit)))
|
||||
|
||||
(eval-after-load "dired"
|
||||
'(define-key dired-mode-map "V" 'dired-vlf))
|
||||
|
||||
(provide 'vlf-integrate)
|
||||
|
||||
;;; vlf-integrate.el ends here
|
||||
248
vlf-occur.el
Normal file
248
vlf-occur.el
Normal file
@@ -0,0 +1,248 @@
|
||||
;;; vlf-occur.el --- Occur-like functionality for VLF -*- lexical-binding: t -*-
|
||||
|
||||
;; Copyright (C) 2014 Free Software Foundation, Inc.
|
||||
|
||||
;; Keywords: large files, indexing, occur
|
||||
;; Author: Andrey Kotlarski <m00naticus@gmail.com>
|
||||
;; URL: https://github.com/m00natic/vlfi
|
||||
|
||||
;; This file 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, or (at your option)
|
||||
;; any later version.
|
||||
|
||||
;; This file 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; see the file COPYING. If not, write to
|
||||
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||||
;; Boston, MA 02111-1307, USA.
|
||||
|
||||
;;; Commentary:
|
||||
;; This package provides the `vlf-occur' command which builds
|
||||
;; index of search occurrences in large file just like occur.
|
||||
|
||||
;;; Code:
|
||||
|
||||
(defvar vlf-occur-mode-map
|
||||
(let ((map (make-sparse-keymap)))
|
||||
(define-key map "n" 'vlf-occur-next-match)
|
||||
(define-key map "p" 'vlf-occur-prev-match)
|
||||
(define-key map "\C-m" 'vlf-occur-visit)
|
||||
(define-key map "\M-\r" 'vlf-occur-visit-new-buffer)
|
||||
(define-key map [mouse-1] 'vlf-occur-visit)
|
||||
(define-key map "o" 'vlf-occur-show)
|
||||
map)
|
||||
"Keymap for command `vlf-occur-mode'.")
|
||||
|
||||
(define-derived-mode vlf-occur-mode special-mode "VLF[occur]"
|
||||
"Major mode for showing occur matches of VLF opened files.")
|
||||
|
||||
(defun vlf-occur-next-match ()
|
||||
"Move cursor to next match."
|
||||
(interactive)
|
||||
(if (eq (get-char-property (point) 'face) 'match)
|
||||
(goto-char (next-single-property-change (point) 'face)))
|
||||
(goto-char (or (text-property-any (point) (point-max) 'face 'match)
|
||||
(text-property-any (point-min) (point)
|
||||
'face 'match))))
|
||||
|
||||
(defun vlf-occur-prev-match ()
|
||||
"Move cursor to previous match."
|
||||
(interactive)
|
||||
(if (eq (get-char-property (point) 'face) 'match)
|
||||
(goto-char (previous-single-property-change (point) 'face)))
|
||||
(while (not (eq (get-char-property (point) 'face) 'match))
|
||||
(goto-char (or (previous-single-property-change (point) 'face)
|
||||
(point-max)))))
|
||||
|
||||
(defun vlf-occur-show (&optional event)
|
||||
"Visit current `vlf-occur' link in a vlf buffer but stay in the \
|
||||
occur buffer. If original VLF buffer has been killed,
|
||||
open new VLF session each time.
|
||||
EVENT may hold details of the invocation."
|
||||
(interactive (list last-nonmenu-event))
|
||||
(let ((occur-buffer (if event
|
||||
(window-buffer (posn-window
|
||||
(event-end event)))
|
||||
(current-buffer))))
|
||||
(vlf-occur-visit event)
|
||||
(pop-to-buffer occur-buffer)))
|
||||
|
||||
(defun vlf-occur-visit-new-buffer ()
|
||||
"Visit `vlf-occur' link in new vlf buffer."
|
||||
(interactive)
|
||||
(let ((current-prefix-arg t))
|
||||
(vlf-occur-visit)))
|
||||
|
||||
(defun vlf-occur-visit (&optional event)
|
||||
"Visit current `vlf-occur' link in a vlf buffer.
|
||||
With prefix argument or if original VLF buffer has been killed,
|
||||
open new VLF session.
|
||||
EVENT may hold details of the invocation."
|
||||
(interactive (list last-nonmenu-event))
|
||||
(when event
|
||||
(set-buffer (window-buffer (posn-window (event-end event))))
|
||||
(goto-char (posn-point (event-end event))))
|
||||
(let* ((pos (point))
|
||||
(pos-relative (- pos (line-beginning-position) 1))
|
||||
(file (get-char-property pos 'file)))
|
||||
(if file
|
||||
(let ((chunk-start (get-char-property pos 'chunk-start))
|
||||
(chunk-end (get-char-property pos 'chunk-end))
|
||||
(vlf-buffer (get-char-property pos 'buffer))
|
||||
(occur-buffer (current-buffer))
|
||||
(match-pos (+ (get-char-property pos 'line-pos)
|
||||
pos-relative)))
|
||||
(cond (current-prefix-arg
|
||||
(setq vlf-buffer (vlf file))
|
||||
(switch-to-buffer occur-buffer))
|
||||
((not (buffer-live-p vlf-buffer))
|
||||
(or (catch 'found
|
||||
(dolist (buf (buffer-list))
|
||||
(set-buffer buf)
|
||||
(and vlf-mode (equal file buffer-file-name)
|
||||
(setq vlf-buffer buf)
|
||||
(throw 'found t))))
|
||||
(setq vlf-buffer (vlf file)))
|
||||
(switch-to-buffer occur-buffer)))
|
||||
(pop-to-buffer vlf-buffer)
|
||||
(vlf-move-to-chunk chunk-start chunk-end)
|
||||
(goto-char match-pos)))))
|
||||
|
||||
(defun vlf-occur (regexp)
|
||||
"Make whole file occur style index for REGEXP.
|
||||
Prematurely ending indexing will still show what's found so far."
|
||||
(interactive (list (read-regexp "List lines matching regexp"
|
||||
(if regexp-history
|
||||
(car regexp-history)))))
|
||||
(if (buffer-modified-p) ;use temporary buffer not to interfere with modifications
|
||||
(let ((vlf-buffer (current-buffer))
|
||||
(file buffer-file-name)
|
||||
(batch-size vlf-batch-size))
|
||||
(with-temp-buffer
|
||||
(setq buffer-file-name file)
|
||||
(set-buffer-modified-p nil)
|
||||
(set (make-local-variable 'vlf-batch-size) batch-size)
|
||||
(vlf-mode 1)
|
||||
(goto-char (point-min))
|
||||
(vlf-with-undo-disabled
|
||||
(vlf-build-occur regexp vlf-buffer))))
|
||||
(let ((start-pos vlf-start-pos)
|
||||
(end-pos vlf-end-pos)
|
||||
(pos (point)))
|
||||
(vlf-beginning-of-file)
|
||||
(goto-char (point-min))
|
||||
(vlf-with-undo-disabled
|
||||
(unwind-protect (vlf-build-occur regexp (current-buffer))
|
||||
(vlf-move-to-chunk start-pos end-pos)
|
||||
(goto-char pos))))))
|
||||
|
||||
(defun vlf-build-occur (regexp vlf-buffer)
|
||||
"Build occur style index for REGEXP over VLF-BUFFER."
|
||||
(let ((case-fold-search t)
|
||||
(line 1)
|
||||
(last-match-line 0)
|
||||
(last-line-pos (point-min))
|
||||
(file buffer-file-name)
|
||||
(total-matches 0)
|
||||
(match-end-pos (+ vlf-start-pos (position-bytes (point))))
|
||||
(occur-buffer (generate-new-buffer
|
||||
(concat "*VLF-occur " (file-name-nondirectory
|
||||
buffer-file-name)
|
||||
"*")))
|
||||
(line-regexp (concat "\\(?5:[\n\C-m]\\)\\|\\(?10:"
|
||||
regexp "\\)"))
|
||||
(batch-step (/ vlf-batch-size 8))
|
||||
(end-of-file nil)
|
||||
(reporter (make-progress-reporter
|
||||
(concat "Building index for " regexp "...")
|
||||
vlf-start-pos vlf-file-size)))
|
||||
(unwind-protect
|
||||
(progn
|
||||
(while (not end-of-file)
|
||||
(if (re-search-forward line-regexp nil t)
|
||||
(progn
|
||||
(setq match-end-pos (+ vlf-start-pos
|
||||
(position-bytes
|
||||
(match-end 0))))
|
||||
(if (match-string 5)
|
||||
(setq line (1+ line) ; line detected
|
||||
last-line-pos (point))
|
||||
(let* ((chunk-start vlf-start-pos)
|
||||
(chunk-end vlf-end-pos)
|
||||
(line-pos (line-beginning-position))
|
||||
(line-text (buffer-substring
|
||||
line-pos (line-end-position))))
|
||||
(with-current-buffer occur-buffer
|
||||
(unless (= line last-match-line) ;new match line
|
||||
(insert "\n:") ; insert line number
|
||||
(let* ((overlay-pos (1- (point)))
|
||||
(overlay (make-overlay
|
||||
overlay-pos
|
||||
(1+ overlay-pos))))
|
||||
(overlay-put overlay 'before-string
|
||||
(propertize
|
||||
(number-to-string line)
|
||||
'face 'shadow)))
|
||||
(insert (propertize line-text ; insert line
|
||||
'file file
|
||||
'buffer vlf-buffer
|
||||
'chunk-start chunk-start
|
||||
'chunk-end chunk-end
|
||||
'mouse-face '(highlight)
|
||||
'line-pos line-pos
|
||||
'help-echo
|
||||
(format "Move to line %d"
|
||||
line))))
|
||||
(setq last-match-line line
|
||||
total-matches (1+ total-matches))
|
||||
(let ((line-start (1+
|
||||
(line-beginning-position)))
|
||||
(match-pos (match-beginning 10)))
|
||||
(add-text-properties ; mark match
|
||||
(+ line-start match-pos (- last-line-pos))
|
||||
(+ line-start (match-end 10)
|
||||
(- last-line-pos))
|
||||
(list 'face 'match
|
||||
'help-echo
|
||||
(format "Move to match %d"
|
||||
total-matches))))))))
|
||||
(setq end-of-file (= vlf-end-pos vlf-file-size))
|
||||
(unless end-of-file
|
||||
(let ((batch-move (- vlf-end-pos batch-step)))
|
||||
(vlf-move-to-batch (if (< batch-move match-end-pos)
|
||||
match-end-pos
|
||||
batch-move) t))
|
||||
(goto-char (if (< vlf-start-pos match-end-pos)
|
||||
(or (byte-to-position (- match-end-pos
|
||||
vlf-start-pos))
|
||||
(point-min))
|
||||
(point-min)))
|
||||
(setq last-match-line 0
|
||||
last-line-pos (line-beginning-position))
|
||||
(progress-reporter-update reporter vlf-end-pos))))
|
||||
(progress-reporter-done reporter))
|
||||
(set-buffer-modified-p nil)
|
||||
(if (zerop total-matches)
|
||||
(progn (with-current-buffer occur-buffer
|
||||
(set-buffer-modified-p nil))
|
||||
(kill-buffer occur-buffer)
|
||||
(message "No matches for \"%s\"" regexp))
|
||||
(with-current-buffer occur-buffer
|
||||
(goto-char (point-min))
|
||||
(insert (propertize
|
||||
(format "%d matches in %d lines for \"%s\" \
|
||||
in file: %s" total-matches line regexp file)
|
||||
'face 'underline))
|
||||
(set-buffer-modified-p nil)
|
||||
(forward-char 2)
|
||||
(vlf-occur-mode))
|
||||
(display-buffer occur-buffer)))))
|
||||
|
||||
(provide 'vlf-occur)
|
||||
|
||||
;;; vlf-occur.el ends here
|
||||
196
vlf-search.el
Normal file
196
vlf-search.el
Normal file
@@ -0,0 +1,196 @@
|
||||
;;; vlf-search.el --- Search functionality for VLF -*- lexical-binding: t -*-
|
||||
|
||||
;; Copyright (C) 2014 Free Software Foundation, Inc.
|
||||
|
||||
;; Keywords: large files, search
|
||||
;; Author: Andrey Kotlarski <m00naticus@gmail.com>
|
||||
;; URL: https://github.com/m00natic/vlfi
|
||||
|
||||
;; This file 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, or (at your option)
|
||||
;; any later version.
|
||||
|
||||
;; This file 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; see the file COPYING. If not, write to
|
||||
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||||
;; Boston, MA 02111-1307, USA.
|
||||
|
||||
;;; Commentary:
|
||||
;; This package provides search utilities for dealing with large files
|
||||
;; in constant memory.
|
||||
|
||||
;;; Code:
|
||||
|
||||
(defun vlf-re-search (regexp count backward batch-step)
|
||||
"Search for REGEXP COUNT number of times forward or BACKWARD.
|
||||
BATCH-STEP is amount of overlap between successive chunks."
|
||||
(if (<= count 0)
|
||||
(error "Count must be positive"))
|
||||
(let* ((case-fold-search t)
|
||||
(match-chunk-start vlf-start-pos)
|
||||
(match-chunk-end vlf-end-pos)
|
||||
(match-start-pos (+ vlf-start-pos (position-bytes (point))))
|
||||
(match-end-pos match-start-pos)
|
||||
(to-find count)
|
||||
(reporter (make-progress-reporter
|
||||
(concat "Searching for " regexp "...")
|
||||
(if backward
|
||||
(- vlf-file-size vlf-end-pos)
|
||||
vlf-start-pos)
|
||||
vlf-file-size)))
|
||||
(vlf-with-undo-disabled
|
||||
(unwind-protect
|
||||
(catch 'end-of-file
|
||||
(if backward
|
||||
(while (not (zerop to-find))
|
||||
(cond ((re-search-backward regexp nil t)
|
||||
(setq to-find (1- to-find)
|
||||
match-chunk-start vlf-start-pos
|
||||
match-chunk-end vlf-end-pos
|
||||
match-start-pos (+ vlf-start-pos
|
||||
(position-bytes
|
||||
(match-beginning 0)))
|
||||
match-end-pos (+ vlf-start-pos
|
||||
(position-bytes
|
||||
(match-end 0)))))
|
||||
((zerop vlf-start-pos)
|
||||
(throw 'end-of-file nil))
|
||||
(t (let ((batch-move (- vlf-start-pos
|
||||
(- vlf-batch-size
|
||||
batch-step))))
|
||||
(vlf-move-to-batch
|
||||
(if (< match-start-pos batch-move)
|
||||
(- match-start-pos vlf-batch-size)
|
||||
batch-move) t))
|
||||
(goto-char (if (< match-start-pos
|
||||
vlf-end-pos)
|
||||
(or (byte-to-position
|
||||
(- match-start-pos
|
||||
vlf-start-pos))
|
||||
(point-max))
|
||||
(point-max)))
|
||||
(progress-reporter-update
|
||||
reporter (- vlf-file-size
|
||||
vlf-start-pos)))))
|
||||
(while (not (zerop to-find))
|
||||
(cond ((re-search-forward regexp nil t)
|
||||
(setq to-find (1- to-find)
|
||||
match-chunk-start vlf-start-pos
|
||||
match-chunk-end vlf-end-pos
|
||||
match-start-pos (+ vlf-start-pos
|
||||
(position-bytes
|
||||
(match-beginning 0)))
|
||||
match-end-pos (+ vlf-start-pos
|
||||
(position-bytes
|
||||
(match-end 0)))))
|
||||
((= vlf-end-pos vlf-file-size)
|
||||
(throw 'end-of-file nil))
|
||||
(t (let ((batch-move (- vlf-end-pos batch-step)))
|
||||
(vlf-move-to-batch
|
||||
(if (< batch-move match-end-pos)
|
||||
match-end-pos
|
||||
batch-move) t))
|
||||
(goto-char (if (< vlf-start-pos match-end-pos)
|
||||
(or (byte-to-position
|
||||
(- match-end-pos
|
||||
vlf-start-pos))
|
||||
(point-min))
|
||||
(point-min)))
|
||||
(progress-reporter-update reporter
|
||||
vlf-end-pos)))))
|
||||
(progress-reporter-done reporter))
|
||||
(set-buffer-modified-p nil)
|
||||
(if backward
|
||||
(vlf-goto-match match-chunk-start match-chunk-end
|
||||
match-end-pos match-start-pos
|
||||
count to-find)
|
||||
(vlf-goto-match match-chunk-start match-chunk-end
|
||||
match-start-pos match-end-pos
|
||||
count to-find))))))
|
||||
|
||||
(defun vlf-goto-match (match-chunk-start match-chunk-end
|
||||
match-pos-start
|
||||
match-pos-end
|
||||
count to-find)
|
||||
"Move to MATCH-CHUNK-START MATCH-CHUNK-END surrounding \
|
||||
MATCH-POS-START and MATCH-POS-END.
|
||||
According to COUNT and left TO-FIND, show if search has been
|
||||
successful. Return nil if nothing found."
|
||||
(if (= count to-find)
|
||||
(progn (vlf-move-to-chunk match-chunk-start match-chunk-end)
|
||||
(goto-char (or (byte-to-position (- match-pos-start
|
||||
vlf-start-pos))
|
||||
(point-max)))
|
||||
(message "Not found")
|
||||
nil)
|
||||
(let ((success (zerop to-find)))
|
||||
(if success
|
||||
(vlf-update-buffer-name)
|
||||
(vlf-move-to-chunk match-chunk-start match-chunk-end))
|
||||
(let* ((match-end (or (byte-to-position (- match-pos-end
|
||||
vlf-start-pos))
|
||||
(point-max)))
|
||||
(overlay (make-overlay (byte-to-position
|
||||
(- match-pos-start
|
||||
vlf-start-pos))
|
||||
match-end)))
|
||||
(overlay-put overlay 'face 'match)
|
||||
(unless success
|
||||
(goto-char match-end)
|
||||
(message "Moved to the %d match which is last"
|
||||
(- count to-find)))
|
||||
(unwind-protect (sit-for 3)
|
||||
(delete-overlay overlay))
|
||||
t))))
|
||||
|
||||
(defun vlf-re-search-forward (regexp count)
|
||||
"Search forward for REGEXP prefix COUNT number of times.
|
||||
Search is performed chunk by chunk in `vlf-batch-size' memory."
|
||||
(interactive (if (vlf-no-modifications)
|
||||
(list (read-regexp "Search whole file"
|
||||
(if regexp-history
|
||||
(car regexp-history)))
|
||||
(or current-prefix-arg 1))))
|
||||
(vlf-re-search regexp count nil (/ vlf-batch-size 8)))
|
||||
|
||||
(defun vlf-re-search-backward (regexp count)
|
||||
"Search backward for REGEXP prefix COUNT number of times.
|
||||
Search is performed chunk by chunk in `vlf-batch-size' memory."
|
||||
(interactive (if (vlf-no-modifications)
|
||||
(list (read-regexp "Search whole file backward"
|
||||
(if regexp-history
|
||||
(car regexp-history)))
|
||||
(or current-prefix-arg 1))))
|
||||
(vlf-re-search regexp count t (/ vlf-batch-size 8)))
|
||||
|
||||
(defun vlf-goto-line (n)
|
||||
"Go to line N. If N is negative, count from the end of file."
|
||||
(interactive (if (vlf-no-modifications)
|
||||
(list (read-number "Go to line: "))))
|
||||
(let ((start-pos vlf-start-pos)
|
||||
(end-pos vlf-end-pos)
|
||||
(pos (point))
|
||||
(success nil))
|
||||
(unwind-protect
|
||||
(if (< 0 n)
|
||||
(progn (vlf-beginning-of-file)
|
||||
(goto-char (point-min))
|
||||
(setq success (vlf-re-search "[\n\C-m]" (1- n)
|
||||
nil 0)))
|
||||
(vlf-end-of-file)
|
||||
(goto-char (point-max))
|
||||
(setq success (vlf-re-search "[\n\C-m]" (- n) t 0)))
|
||||
(if success
|
||||
(message "Onto line %s" n)
|
||||
(vlf-move-to-chunk start-pos end-pos)
|
||||
(goto-char pos)))))
|
||||
|
||||
(provide 'vlf-search)
|
||||
|
||||
;;; vlf-search.el ends here
|
||||
145
vlf-write.el
Normal file
145
vlf-write.el
Normal file
@@ -0,0 +1,145 @@
|
||||
;;; vlf-write.el --- Saving functionality for VLF -*- lexical-binding: t -*-
|
||||
|
||||
;; Copyright (C) 2014 Free Software Foundation, Inc.
|
||||
|
||||
;; Keywords: large files, saving
|
||||
;; Author: Andrey Kotlarski <m00naticus@gmail.com>
|
||||
;; URL: https://github.com/m00natic/vlfi
|
||||
|
||||
;; This file 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, or (at your option)
|
||||
;; any later version.
|
||||
|
||||
;; This file 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; see the file COPYING. If not, write to
|
||||
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||||
;; Boston, MA 02111-1307, USA.
|
||||
|
||||
;;; Commentary:
|
||||
;; This package provides the `vlf-write' command which takes care of
|
||||
;; saving changes where only part of file is viewed and updated.
|
||||
|
||||
;;; Code:
|
||||
|
||||
(defun vlf-write ()
|
||||
"Write current chunk to file. Always return true to disable save.
|
||||
If changing size of chunk, shift remaining file content."
|
||||
(interactive)
|
||||
(and (buffer-modified-p)
|
||||
(or (verify-visited-file-modtime (current-buffer))
|
||||
(y-or-n-p "File has changed since visited or saved. \
|
||||
Save anyway? "))
|
||||
(if (zerop vlf-file-size) ;new file
|
||||
(progn
|
||||
(write-region nil nil buffer-file-name vlf-start-pos t)
|
||||
(setq vlf-file-size (vlf-get-file-size
|
||||
buffer-file-truename)
|
||||
vlf-end-pos vlf-file-size)
|
||||
(vlf-update-buffer-name))
|
||||
(let* ((region-length (length (encode-coding-region
|
||||
(point-min) (point-max)
|
||||
buffer-file-coding-system t)))
|
||||
(size-change (- vlf-end-pos vlf-start-pos
|
||||
region-length)))
|
||||
(if (zerop size-change)
|
||||
(write-region nil nil buffer-file-name vlf-start-pos t)
|
||||
(let ((pos (point)))
|
||||
(if (< 0 size-change)
|
||||
(vlf-file-shift-back size-change)
|
||||
(vlf-file-shift-forward (- size-change))
|
||||
(vlf-verify-size))
|
||||
(vlf-move-to-chunk-2 vlf-start-pos
|
||||
(if (< (- vlf-end-pos vlf-start-pos)
|
||||
vlf-batch-size)
|
||||
(+ vlf-start-pos vlf-batch-size)
|
||||
vlf-end-pos))
|
||||
(vlf-update-buffer-name)
|
||||
(goto-char pos))))))
|
||||
t)
|
||||
|
||||
(defun vlf-file-shift-back (size-change)
|
||||
"Shift file contents SIZE-CHANGE bytes back."
|
||||
(write-region nil nil buffer-file-name vlf-start-pos t)
|
||||
(let ((read-start-pos vlf-end-pos)
|
||||
(coding-system-for-write 'no-conversion)
|
||||
(reporter (make-progress-reporter "Adjusting file content..."
|
||||
vlf-end-pos
|
||||
vlf-file-size)))
|
||||
(vlf-with-undo-disabled
|
||||
(while (vlf-shift-batch read-start-pos (- read-start-pos
|
||||
size-change))
|
||||
(setq read-start-pos (+ read-start-pos vlf-batch-size))
|
||||
(progress-reporter-update reporter read-start-pos))
|
||||
;; pad end with space
|
||||
(erase-buffer)
|
||||
(vlf-verify-size)
|
||||
(insert-char 32 size-change))
|
||||
(write-region nil nil buffer-file-name (- vlf-file-size
|
||||
size-change) t)
|
||||
(progress-reporter-done reporter)))
|
||||
|
||||
(defun vlf-shift-batch (read-pos write-pos)
|
||||
"Read `vlf-batch-size' bytes from READ-POS and write them \
|
||||
back at WRITE-POS. Return nil if EOF is reached, t otherwise."
|
||||
(erase-buffer)
|
||||
(vlf-verify-size)
|
||||
(let ((read-end (+ read-pos vlf-batch-size)))
|
||||
(insert-file-contents-literally buffer-file-name nil
|
||||
read-pos
|
||||
(min vlf-file-size read-end))
|
||||
(write-region nil nil buffer-file-name write-pos 0)
|
||||
(< read-end vlf-file-size)))
|
||||
|
||||
(defun vlf-file-shift-forward (size-change)
|
||||
"Shift file contents SIZE-CHANGE bytes forward.
|
||||
Done by saving content up front and then writing previous batch."
|
||||
(let ((read-size (max (/ vlf-batch-size 2) size-change))
|
||||
(read-pos vlf-end-pos)
|
||||
(write-pos vlf-start-pos)
|
||||
(reporter (make-progress-reporter "Adjusting file content..."
|
||||
vlf-start-pos
|
||||
vlf-file-size)))
|
||||
(vlf-with-undo-disabled
|
||||
(when (vlf-shift-batches read-size read-pos write-pos t)
|
||||
(setq write-pos (+ read-pos size-change)
|
||||
read-pos (+ read-pos read-size))
|
||||
(progress-reporter-update reporter write-pos)
|
||||
(let ((coding-system-for-write 'no-conversion))
|
||||
(while (vlf-shift-batches read-size read-pos write-pos nil)
|
||||
(setq write-pos (+ read-pos size-change)
|
||||
read-pos (+ read-pos read-size))
|
||||
(progress-reporter-update reporter write-pos)))))
|
||||
(progress-reporter-done reporter)))
|
||||
|
||||
(defun vlf-shift-batches (read-size read-pos write-pos hide-read)
|
||||
"Append READ-SIZE bytes of file starting at READ-POS.
|
||||
Then write initial buffer content to file at WRITE-POS.
|
||||
If HIDE-READ is non nil, temporarily hide literal read content.
|
||||
Return nil if EOF is reached, t otherwise."
|
||||
(vlf-verify-size)
|
||||
(let ((read-more (< read-pos vlf-file-size))
|
||||
(start-write-pos (point-min))
|
||||
(end-write-pos (point-max)))
|
||||
(when read-more
|
||||
(goto-char end-write-pos)
|
||||
(insert-file-contents-literally buffer-file-name nil read-pos
|
||||
(min vlf-file-size
|
||||
(+ read-pos read-size))))
|
||||
;; write
|
||||
(if hide-read ; hide literal region if user has to choose encoding
|
||||
(narrow-to-region start-write-pos end-write-pos))
|
||||
(write-region start-write-pos end-write-pos
|
||||
buffer-file-name write-pos 0)
|
||||
(delete-region start-write-pos end-write-pos)
|
||||
(if hide-read (widen))
|
||||
read-more))
|
||||
|
||||
(provide 'vlf-write)
|
||||
|
||||
;;; vlf-write.el ends here
|
||||
Reference in New Issue
Block a user