- don't nullify default buffer coding system

- make vlf return the newly created VLF buffer
- simplify beginning and end jumps

README.org

@@ -36,8 +36,8 @@ editing, search and indexing.
 ** 32-bit GNU Emacs
 
 Regular Emacs integers are used, so if you use 32-bit Emacs without
-bignum support and have really huge file (with size beyond the maximum
+bignum support, VLF will not work with files over 512 MB (maximum
-integer value), VLF will probably not quite work.
+integer value).
 
 ** Memory control
 
@@ -47,7 +47,13 @@ integer value), VLF will probably not quite work.
 
 ** Applicability
 
-You can control when vlf-mode is invoked or offered as choice with the
+To have *vlf* offered as choice when opening large files:
+
+#+BEGIN_EXAMPLE
+(require 'vlf-integrate)
+#+END_EXAMPLE
+
+You can control when vlf-mode is invoked or offered with the
 *vlf-application* customization option.  By default it will offer VLF
 when opening large files.  There are also options to never use it (you
 can still call *vlf* command explicitly); to use it without asking for
@@ -59,6 +65,20 @@ that vlf-mode automatically launches for large files:
  '(vlf-application 'dont-ask))
 #+END_EXAMPLE
 
+*** Disable for specific mode
+
+To disable automatic usage of VLF for a major mode, add it to
+*vlf-forbidden-modes-list*.
+
+*** Disable for specific function
+
+To disable automatic usage of VLF for a function, for example named
+*func* defined in file *file.el*:
+
+#+BEGIN_EXAMPLE
+(vlf-disable-for-function func "file")
+#+END_EXAMPLE
+
 ** Keymap
 
 All VLF operations are grouped under the *C-c C-v* prefix by default.
@@ -79,6 +99,9 @@ refresh with *C-c C-v g*.
 
 ** Move around
 
+Scrolling automatically triggers moving to previous or next chunk at
+the beginning or end respectively of the current one.
+
 *C-c C-v n* and *C-c C-v p* move batch by batch.  With positive
 prefix argument they move prefix number of batches.  With negative -
 append prefix number of batches.
@@ -93,6 +116,11 @@ how many chunks there are (using the current batch size), look at the
 parenthesized part of the buffer name, batch size is also indicated at
 the end.
 
+** Follow point
+
+Continuous chunk recenter around point in current buffer can be
+toggled with *C-c C-v f*.
+
 ** Search whole file
 
 *C-c C-v s* and *C-c C-v r* search forward and backward respectively

vlf-base.el

@@ -0,0 +1,374 @@
+;;; vlf-base.el --- VLF primitive operations  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2014 Free Software Foundation, Inc.
+
+;; Keywords: large files, chunk
+;; 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 basic chunk operations for VLF,
+;; most notable being the `vlf-move-to-chunk' function.
+
+;;; Code:
+
+(defgroup vlf nil
+  "View Large Files in Emacs."
+  :prefix "vlf-"
+  :group 'files)
+
+(defcustom vlf-batch-size 1024
+  "Defines how large each batch of file data is (in bytes)."
+  :group 'vlf
+  :type 'integer)
+(put 'vlf-batch-size 'permanent-local t)
+
+;;; Keep track of file position.
+(defvar vlf-start-pos 0
+  "Absolute position of the visible chunk start.")
+(make-variable-buffer-local 'vlf-start-pos)
+(put 'vlf-start-pos 'permanent-local t)
+
+(defvar vlf-end-pos 0 "Absolute position of the visible chunk end.")
+(make-variable-buffer-local 'vlf-end-pos)
+(put 'vlf-end-pos 'permanent-local t)
+
+(defvar vlf-file-size 0 "Total size of presented file.")
+(make-variable-buffer-local 'vlf-file-size)
+(put 'vlf-file-size 'permanent-local t)
+
+(defconst vlf-sample-size 24
+  "Minimal number of bytes that can be properly decoded.")
+
+(defun vlf-get-file-size (file)
+  "Get size in bytes of FILE."
+  (or (nth 7 (file-attributes file)) 0))
+
+(defun vlf-verify-size (&optional update-visited-time)
+  "Update file size information if necessary and visited file time.
+If non-nil, UPDATE-VISITED-TIME."
+  (unless (verify-visited-file-modtime (current-buffer))
+    (setq vlf-file-size (vlf-get-file-size buffer-file-truename))
+    (if update-visited-time
+        (set-visited-file-modtime))))
+
+(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-update-buffer-name ()
+  "Update the current buffer name."
+  (rename-buffer (format "%s(%d/%d)[%s]"
+                         (file-name-nondirectory buffer-file-name)
+                         (/ vlf-end-pos vlf-batch-size)
+                         (/ vlf-file-size vlf-batch-size)
+                         (file-size-human-readable vlf-batch-size))
+                 t))
+
+(defmacro vlf-with-undo-disabled (&rest body)
+  "Execute BODY with temporarily disabled undo."
+  `(let ((undo-list buffer-undo-list))
+     (setq buffer-undo-list t)
+     (unwind-protect (progn ,@body)
+       (setq buffer-undo-list undo-list))))
+
+(defun vlf-move-to-chunk (start end &optional minimal)
+  "Move to chunk enclosed by START END bytes.
+When given MINIMAL flag, skip non important operations.
+If same as current chunk is requested, do nothing.
+Return number of bytes moved back for proper decoding and number of
+bytes added to the end."
+  (unless (and (= start vlf-start-pos)
+               (= end vlf-end-pos))
+    (vlf-verify-size)
+    (let ((shifts (vlf-move-to-chunk-1 start end)))
+      (and shifts (not minimal)
+           (vlf-update-buffer-name))
+      shifts)))
+
+(defun vlf-move-to-chunk-1 (start end)
+  "Move to chunk enclosed by START END keeping as much edits if any.
+Return number of bytes moved back for proper decoding and number of
+bytes added to the end."
+  (widen)
+  (let* ((modified (buffer-modified-p))
+         (start (max 0 start))
+         (end (min end vlf-file-size))
+         (edit-end (if modified
+                       (+ vlf-start-pos
+                          (length (encode-coding-region
+                                   (point-min) (point-max)
+                                   buffer-file-coding-system t)))
+                     vlf-end-pos)))
+    (cond
+     ((or (< edit-end start) (< end vlf-start-pos)
+          (not (verify-visited-file-modtime (current-buffer))))
+      (when (or (not modified)
+                (y-or-n-p "Chunk modified, are you sure? ")) ;full chunk renewal
+        (set-buffer-modified-p nil)
+        (vlf-move-to-chunk-2 start end)))
+     ((and (= start vlf-start-pos) (= end edit-end))
+      (or modified (vlf-move-to-chunk-2 start end)))
+     ((or (and (<= start vlf-start-pos) (<= edit-end end))
+          (not modified)
+          (y-or-n-p "Chunk modified, are you sure? "))
+      (let ((shift-start 0)
+            (shift-end 0))
+        (let ((pos (+ (position-bytes (point)) vlf-start-pos))
+              (inhibit-read-only t))
+          (cond ((< end edit-end)
+                 (let* ((del-pos (1+ (or (byte-to-position
+                                          (- end vlf-start-pos))
+                                         0)))
+                        (del-len (length (encode-coding-region
+                                          del-pos (point-max)
+                                          buffer-file-coding-system
+                                          t))))
+                   (setq end (- (if (zerop vlf-end-pos)
+                                    vlf-file-size
+                                  vlf-end-pos)
+                                del-len))
+                   (vlf-with-undo-disabled
+                    (delete-region del-pos (point-max)))))
+                ((< edit-end end)
+                 (vlf-with-undo-disabled
+                  (setq shift-end (cdr (vlf-insert-file-contents
+                                        vlf-end-pos end
+                                        (/= start vlf-end-pos) t
+                                        (point-max)))))))
+          (cond ((< vlf-start-pos start)
+                 (let* ((del-pos (1+ (byte-to-position
+                                      (- start vlf-start-pos))))
+                        (del-len (length (encode-coding-region
+                                          (point-min) del-pos
+                                          buffer-file-coding-system
+                                          t))))
+                   (setq start (+ vlf-start-pos del-len))
+                   (vlf-with-undo-disabled
+                    (delete-region (point-min) del-pos))
+                   (vlf-shift-undo-list (- (point-min) del-pos))))
+                ((< start vlf-start-pos)
+                 (let ((edit-end-pos (point-max)))
+                   (vlf-with-undo-disabled
+                    (setq shift-start (car (vlf-insert-file-contents
+                                            start vlf-start-pos t
+                                            (/= end vlf-start-pos)
+                                            edit-end-pos)))
+                    (goto-char (point-min))
+                    (insert (delete-and-extract-region
+                             edit-end-pos (point-max))))
+                   (vlf-shift-undo-list (- (point-max) edit-end-pos)))))
+          (setq start (- start shift-start))
+          (goto-char (or (byte-to-position (- pos start))
+                         (byte-to-position (- pos vlf-start-pos))
+                         (point-max)))
+          (setq vlf-start-pos start
+                vlf-end-pos (+ end shift-end)))
+        (set-buffer-modified-p modified)
+        (set-visited-file-modtime)
+        (cons shift-start shift-end))))))
+
+(defun vlf-move-to-chunk-2 (start end)
+  "Unconditionally move to chunk enclosed by START END bytes.
+Return number of bytes moved back for proper decoding and number of
+bytes added to the end."
+  (vlf-verify-size t)
+  (setq vlf-start-pos (max 0 start)
+        vlf-end-pos (min end vlf-file-size))
+  (let (shifts)
+    (let ((inhibit-read-only t)
+          (pos (position-bytes (point))))
+      (vlf-with-undo-disabled
+       (erase-buffer)
+       (setq shifts (vlf-insert-file-contents vlf-start-pos
+                                              vlf-end-pos t t)
+             vlf-start-pos (- vlf-start-pos (car shifts))
+             vlf-end-pos (+ vlf-end-pos (cdr shifts)))
+       (goto-char (or (byte-to-position (+ pos (car shifts)))
+                      (point-max)))))
+    (set-buffer-modified-p nil)
+    (setq buffer-undo-list nil)
+    shifts))
+
+(defun vlf-insert-file-contents (start end adjust-start adjust-end
+                                       &optional position)
+  "Adjust chunk at absolute START to END till content can be\
+properly decoded.  ADJUST-START determines if trying to prepend bytes\
+ to the beginning, ADJUST-END - append to the end.
+Use buffer POSITION as start if given.
+Return number of bytes moved back for proper decoding and number of
+bytes added to the end."
+  (setq adjust-start (and adjust-start (not (zerop start)))
+        adjust-end (and adjust-end (< end vlf-file-size))
+        position (or position (point-min)))
+  (goto-char position)
+  (let ((shift-start 0)
+        (shift-end 0)
+        (safe-end (if adjust-end
+                      (min vlf-file-size (+ end 4))
+                    end)))
+    (if adjust-start
+        (setq shift-start (vlf-adjust-start start safe-end position
+                                            adjust-end)
+              start (- start shift-start))
+      (vlf-insert-file-contents-safe start safe-end position))
+    (if adjust-end
+        (setq shift-end (vlf-adjust-end start end position)))
+    (cons shift-start shift-end)))
+
+(defun vlf-adjust-start (start end position adjust-end)
+  "Adjust chunk beginning at absolute START to END till content can\
+be properly decoded.  Use buffer POSITION as start.
+ADJUST-END is non-nil if end would be adjusted later.
+Return number of bytes moved back for proper decoding."
+  (let* ((safe-start (max 0 (- start 4)))
+         (sample-end (min end (+ safe-start vlf-sample-size)))
+         (chunk-size (- sample-end safe-start))
+         (strict (or (= sample-end vlf-file-size)
+                     (and (not adjust-end) (= sample-end end))))
+         (shift 0))
+    (while (and (progn (vlf-insert-file-contents-safe
+                        safe-start sample-end position)
+                       (not (zerop safe-start)))
+                (< shift 3)
+                (let ((diff (- chunk-size
+                               (length
+                                (encode-coding-region
+                                 position (point-max)
+                                 buffer-file-coding-system t)))))
+                  (if strict
+                      (not (zerop diff))
+                    (or (< diff -3) (< 0 diff)))))
+      (setq shift (1+ shift)
+            safe-start (1- safe-start)
+            chunk-size (1+ chunk-size))
+      (delete-region position (point-max)))
+    (let ((cut-pos position)
+          (cut-len 0))
+      (while (< safe-start start)
+        (setq cut-len (length (encode-coding-region
+                               cut-pos (1+ cut-pos)
+                               buffer-file-coding-system t))
+              cut-pos (1+ cut-pos)
+              safe-start (+ safe-start cut-len)))
+      (if (< start safe-start)
+          (setq safe-start (- safe-start cut-len)
+                cut-pos (1- cut-pos)))
+      (if (= sample-end end)
+          (delete-region position cut-pos)
+        (delete-region position (point-max))
+        (vlf-insert-file-contents-safe safe-start end position)))
+    (- start safe-start)))
+
+(defun vlf-adjust-end (start end position)
+  "Adjust chunk end at absolute START to END starting at POSITION.
+Remove characters from the end until length is closest to expected.
+Return number of bytes added over expected."
+  (let ((expected-size (- end start))
+        (current-size (length (encode-coding-region
+                               position (point-max)
+                               buffer-file-coding-system t)))
+        (cut-point (point-max))
+        (cut-len 0))
+    (while (< expected-size current-size)
+      (setq cut-len (length (encode-coding-region
+                             (1- cut-point) cut-point
+                             buffer-file-coding-system t))
+            cut-point (1- cut-point)
+            current-size (- current-size cut-len)))
+    (if (< current-size expected-size)
+        (setq cut-point (1+ cut-point)
+              current-size (+ current-size cut-len)))
+    (delete-region cut-point (point-max))
+    (- current-size expected-size)))
+
+(defun vlf-insert-file-contents-safe (start end position)
+  "Extract decoded file bytes START to END at POSITION."
+  (let ((coding buffer-file-coding-system))
+    (insert-file-contents-literally buffer-file-name nil start end)
+    (let ((coding-system-for-read coding))
+      (decode-coding-inserted-region position (point-max)
+                                     buffer-file-name nil start end)))
+  (setq buffer-file-coding-system last-coding-system-used))
+
+(defun vlf-shift-undo-list (n)
+  "Shift undo list element regions by N."
+  (or (eq buffer-undo-list t)
+      (setq buffer-undo-list
+            (nreverse
+             (let ((min (point-min))
+                   undo-list)
+               (catch 'end
+                 (dolist (el buffer-undo-list undo-list)
+                   (push
+                    (cond
+                     ((null el) nil)
+                     ((numberp el) (let ((pos (+ el n)))
+                                     (if (< pos min)
+                                         (throw 'end undo-list)
+                                       pos)))
+                     (t (let ((head (car el)))
+                          (cond ((numberp head)
+                                 (let ((beg (+ head n)))
+                                   (if (< beg min)
+                                       (throw 'end undo-list)
+                                     (cons beg (+ (cdr el) n)))))
+                                ((stringp head)
+                                 (let* ((pos (cdr el))
+                                        (positive (< 0 pos))
+                                        (new (+ (abs pos) n)))
+                                   (if (< new min)
+                                       (throw 'end undo-list)
+                                     (cons head (if positive
+                                                    new
+                                                  (- new))))))
+                                ((null head)
+                                 (let ((beg (+ (nth 3 el) n)))
+                                   (if (< beg min)
+                                       (throw 'end undo-list)
+                                     (cons
+                                      nil
+                                      (cons
+                                       (cadr el)
+                                       (cons
+                                        (nth 2 el)
+                                        (cons beg
+                                              (+ (cddr
+                                                  (cddr el)) n))))))))
+                                ((and (eq head 'apply)
+                                      (numberp (cadr el)))
+                                 (let ((beg (+ (nth 2 el) n)))
+                                   (if (< beg min)
+                                       (throw 'end undo-list)
+                                     (cons
+                                      'apply
+                                      (cons
+                                       (cadr el)
+                                       (cons
+                                        beg
+                                        (cons
+                                         (+ (nth 3 el) n)
+                                         (cons (nth 4 el)
+                                               (cdr (last el))))))))))
+                                (t el)))))
+                    undo-list))))))))
+
+(provide 'vlf-base)
+
+;;; vlf-base.el ends here

vlf-follow.el

@@ -0,0 +1,85 @@
+;;; 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:
+
+(require 'vlf)
+
+(defvar vlf-follow-timer nil
+  "Contains timer if vlf buffer is set to continuously recenter.")
+(make-variable-buffer-local 'vlf-follow-timer)
+(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."
+  (when vlf-follow-timer
+    (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

vlf-integrate.el

@@ -0,0 +1,156 @@
+;;; 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)))
+
+(autoload 'vlf "vlf" "View Large FILE in batches." t)
+
+(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"))))))))
+
+;; disable for some functions
+(defmacro vlf-disable-for-function (func file)
+  "Build advice to disable VLF during execution of FUNC\
+defined in FILE."
+  `(eval-after-load ,file
+     '(defadvice ,func (around ,(intern (concat "vlf-"
+                                                (symbol-name func)))
+                               compile activate)
+        "Temporarily disable `vlf-mode'."
+        (let ((vlf-application nil))
+          ad-do-it))))
+
+(vlf-disable-for-function tags-verify-table "etags")
+(vlf-disable-for-function tag-find-file-of-tag-noselect "etags")
+(vlf-disable-for-function helm-etags-create-buffer "helm-tags")
+
+;; dired
+(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

vlf-occur.el

@@ -0,0 +1,250 @@
+;;; 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:
+
+(require 'vlf)
+
+(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

vlf-search.el

@@ -0,0 +1,198 @@
+;;; 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:
+
+(require 'vlf)
+
+(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

vlf-write.el

@@ -0,0 +1,147 @@
+;;; 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:
+
+(require 'vlf-base)
+
+(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))
+         (widen)
+         (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-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 t)
+     (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 t)
+  (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 t)
+  (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