m00natic pushed a commit to branch master
in repository elpa.
commit de361827d8f40ee471163a029c28e833f094869f
Author: Andrey Kotlarski <m00nati...@gmail.com>
Date: Sun Feb 23 17:33:35 2014 +0200
* packages/vlf: Version 1.5. Add hexl-mode integration and hook
extensibility.
* vlf.el: (vlf-before-batch-functions, vlf-after-batch-functions):
New hooks.
(vlf-mode): Play well with hexl-mode. Don't disable mode in case
user has declined to reload whole file.
(vlf-keep-alive, vlf-hexl-before, vlf-hexl-after): New functions.
Use them in hooks.
(vlf-hexl-save, vlf-hexl-scroll-up, vlf-hexl-scroll-down): New
advices.
* vlf-write.el (vlf-write): Run batch hooks. Check if tramp is
loaded.
* vlf-search.el (vlf-re-search, vlf-goto-line): Run batch hooks.
Check if tramp is loaded.
* vlf-occur.el (vlf-occur): Run batch hooks.
(vlf-build-occur): Check if tramp is loaded.
* vlf-integrate.el: Minor whitespace adjustment.
* vlf-ediff.el: Enable lexical scoping.
(vlf-ediff-next): Run batch hooks. Check if tramp is loaded.
* vlf-base.el (vlf-before-chunk-update, vlf-after-chunk-update):
New hooks.
(vlf-move-to-chunk-1, vlf-move-to-chunk-2): Run them.
(vlf-move-to-chunk-2): Delete undo info only in case it's not
disabled.
(vlf-insert-file-contents-1): Use insert-file-contents instead of
manual decoding and remove position parameter.
(vlf-insert-file-contents, vlf-adjust-start): Adjust calls.
---
packages/vlf/vlf-base.el | 55 +++++++---------
packages/vlf/vlf-ediff.el | 21 ++++---
packages/vlf/vlf-integrate.el | 18 ++---
packages/vlf/vlf-occur.el | 11 +++-
packages/vlf/vlf-search.el | 17 ++++--
packages/vlf/vlf-write.el | 70 +++++++++++----------
packages/vlf/vlf.el | 135 +++++++++++++++++++++++++++++++----------
7 files changed, 202 insertions(+), 125 deletions(-)
diff --git a/packages/vlf/vlf-base.el b/packages/vlf/vlf-base.el
index 2a530f8..98b6831 100644
--- a/packages/vlf/vlf-base.el
+++ b/packages/vlf/vlf-base.el
@@ -27,17 +27,19 @@
;;; 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)
+ :group 'vlf :type 'integer)
(put 'vlf-batch-size 'permanent-local t)
+(defcustom vlf-before-chunk-update nil
+ "Hook that runs before chunk update."
+ :group 'vlf :type 'hook)
+
+(defcustom vlf-after-chunk-update nil
+ "Hook that runs after chunk update."
+ :group 'vlf :type 'hook)
+
;;; Keep track of file position.
(defvar vlf-start-pos 0
"Absolute position of the visible chunk start.")
@@ -142,6 +144,7 @@ bytes added to the end."
((or (and (<= start vlf-start-pos) (<= edit-end end))
(not modified)
(y-or-n-p "Chunk modified, are you sure? "))
+ (run-hooks 'vlf-before-chunk-update)
(let ((shift-start 0)
(shift-end 0))
(let ((pos (+ (position-bytes (point)) vlf-start-pos))
@@ -200,12 +203,14 @@ bytes added to the end."
(setq vlf-start-pos start))
(set-buffer-modified-p modified)
(set-visited-file-modtime)
+ (run-hooks 'vlf-after-chunk-update)
(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."
+ (run-hooks 'vlf-before-chunk-update)
(vlf-verify-size t)
(setq vlf-start-pos (max 0 start)
vlf-end-pos (min end vlf-file-size))
@@ -221,14 +226,16 @@ bytes added to the end."
(goto-char (or (byte-to-position (+ pos (car shifts)))
(point-max)))))
(set-buffer-modified-p nil)
- (setq buffer-undo-list nil)
+ (or (eq buffer-undo-list t)
+ (setq buffer-undo-list nil))
+ (run-hooks 'vlf-after-chunk-update)
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.
+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."
@@ -245,7 +252,7 @@ bytes added to the end."
(setq shift-start (vlf-adjust-start start safe-end position
adjust-end)
start (- start shift-start))
- (vlf-insert-file-contents-1 start safe-end position))
+ (vlf-insert-file-contents-1 start safe-end))
(if adjust-end
(setq shift-end (- (car (vlf-delete-region position start
safe-end end
@@ -254,23 +261,9 @@ bytes added to the end."
end)))
(cons shift-start shift-end)))
-(defun vlf-insert-file-contents-1 (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)))
- (when (eq (detect-coding-region position (min (+ position
- vlf-sample-size)
- (point-max)) t)
- 'no-conversion)
- (delete-region position (point-max))
- (insert-file-contents-literally buffer-file-name nil start end)
- (let ((coding-system-for-read nil))
- (decode-coding-inserted-region position (point-max)
- buffer-file-name nil start end)))
- (setq buffer-file-coding-system last-coding-system-used))
+(defun vlf-insert-file-contents-1 (start end)
+ "Extract decoded file bytes START to END."
+ (insert-file-contents buffer-file-name nil start end))
(defun vlf-adjust-start (start end position adjust-end)
"Adjust chunk beginning at absolute START to END till content can\
@@ -283,8 +276,8 @@ Return number of bytes moved back for proper decoding."
(strict (or (= sample-end vlf-file-size)
(and (not adjust-end) (= sample-end end))))
(shift 0))
- (while (and (progn (vlf-insert-file-contents-1
- safe-start sample-end position)
+ (while (and (progn (vlf-insert-file-contents-1 safe-start
+ sample-end)
(not (zerop safe-start)))
(< shift 3)
(let ((diff (- chunk-size
@@ -304,7 +297,7 @@ Return number of bytes moved back for proper decoding."
position t 'start)))
(unless (= sample-end end)
(delete-region position (point-max))
- (vlf-insert-file-contents-1 safe-start end position))
+ (vlf-insert-file-contents-1 safe-start end))
(- start safe-start)))
(defun vlf-delete-region (position start end border cut-point from-start
diff --git a/packages/vlf/vlf-ediff.el b/packages/vlf/vlf-ediff.el
index 51c8aec..2b7c63f 100644
--- a/packages/vlf/vlf-ediff.el
+++ b/packages/vlf/vlf-ediff.el
@@ -1,4 +1,4 @@
-;;; vlf-ediff.el --- VLF ediff functionality
+;;; vlf-ediff.el --- VLF ediff functionality -*- lexical-binding: t -*-
;; Copyright (C) 2014 Free Software Foundation, Inc.
@@ -154,6 +154,7 @@ beginning of difference list."
governed by EDIFF-BUFFER. NEXT-FUNC is used to jump to the next
logical chunks in case there is no difference at the current ones."
(set-buffer buffer-A)
+ (run-hook-with-args 'vlf-before-batch-functions 'ediff)
(setq buffer-A (current-buffer)) ;names change, so reference by buffer object
(let ((end-A (= vlf-start-pos vlf-end-pos))
(chunk-A (cons vlf-start-pos vlf-end-pos))
@@ -163,9 +164,11 @@ logical chunks in case there is no difference at the
current ones."
(forward-p (eq next-func 'vlf-next-chunk)))
(font-lock-mode 0)
(set-buffer buffer-B)
+ (run-hook-with-args 'vlf-before-batch-functions 'ediff)
(setq buffer-B (current-buffer)
min-file-size (min min-file-size vlf-file-size))
- (let ((tramp-verbose (min 2 tramp-verbose))
+ (let ((tramp-verbose (if (boundp 'tramp-verbose)
+ (min tramp-verbose 2)))
(end-B (= vlf-start-pos vlf-end-pos))
(chunk-B (cons vlf-start-pos vlf-end-pos))
(font-lock-B font-lock-mode)
@@ -222,12 +225,6 @@ logical chunks in case there is no difference at the
current ones."
(and (not end-A) (not end-B)))
(vlf-ediff-refine buffer-A buffer-B)))
(setq done t))
- (when font-lock-A
- (set-buffer buffer-A)
- (font-lock-mode 1))
- (when font-lock-B
- (set-buffer buffer-B)
- (font-lock-mode 1))
(unless done
(set-buffer buffer-A)
(set-buffer-modified-p nil)
@@ -237,7 +234,13 @@ logical chunks in case there is no difference at the
current ones."
(vlf-move-to-chunk (car chunk-B) (cdr chunk-B))
(set-buffer ediff-buffer)
(ediff-update-diffs)
- (vlf-ediff-refine buffer-A buffer-B))))))
+ (vlf-ediff-refine buffer-A buffer-B))
+ (set-buffer buffer-A)
+ (if font-lock-A (font-lock-mode 1))
+ (run-hook-with-args 'vlf-after-batch-functions 'ediff)
+ (set-buffer buffer-B)
+ (if font-lock-B (font-lock-mode 1))
+ (run-hook-with-args 'vlf-after-batch-functions 'ediff)))))
(defun vlf-ediff-refine (buffer-A buffer-B)
"Try to minimize differences between BUFFER-A and BUFFER-B.
diff --git a/packages/vlf/vlf-integrate.el b/packages/vlf/vlf-integrate.el
index c072398..435ac45 100644
--- a/packages/vlf/vlf-integrate.el
+++ b/packages/vlf/vlf-integrate.el
@@ -26,10 +26,8 @@
;;; Code:
-(defgroup vlf nil
- "View Large Files in Emacs."
- :prefix "vlf-"
- :group 'files)
+(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.
@@ -37,18 +35,16 @@ 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)))
+ :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))
+ :group 'vlf :type '(list symbol))
(unless (fboundp 'file-size-human-readable)
(defun file-size-human-readable (file-size)
diff --git a/packages/vlf/vlf-occur.el b/packages/vlf/vlf-occur.el
index 3b7be85..cea885e 100644
--- a/packages/vlf/vlf-occur.el
+++ b/packages/vlf/vlf-occur.el
@@ -131,8 +131,11 @@ Prematurely ending indexing will still show what's found
so far."
(set (make-local-variable 'vlf-batch-size) batch-size)
(vlf-mode 1)
(goto-char (point-min))
+ (run-hook-with-args 'vlf-before-batch-functions 'occur)
(vlf-with-undo-disabled
- (vlf-build-occur regexp vlf-buffer))))
+ (vlf-build-occur regexp vlf-buffer))
+ (run-hook-with-args 'vlf-after-batch-functions 'occur)))
+ (run-hook-with-args 'vlf-before-batch-functions 'occur)
(let ((start-pos vlf-start-pos)
(end-pos vlf-end-pos)
(pos (point)))
@@ -141,11 +144,13 @@ Prematurely ending indexing will still show what's found
so far."
(goto-char (point-min))
(unwind-protect (vlf-build-occur regexp (current-buffer))
(vlf-move-to-chunk start-pos end-pos)
- (goto-char pos))))))
+ (goto-char pos))))
+ (run-hook-with-args 'vlf-after-batch-functions 'occur)))
(defun vlf-build-occur (regexp vlf-buffer)
"Build occur style index for REGEXP over VLF-BUFFER."
- (let ((tramp-verbose (min 2 tramp-verbose))
+ (let ((tramp-verbose (if (boundp 'tramp-verbose)
+ (min tramp-verbose 2)))
(case-fold-search t)
(line 1)
(last-match-line 0)
diff --git a/packages/vlf/vlf-search.el b/packages/vlf/vlf-search.el
index 8fa2ce4..0462cb2 100644
--- a/packages/vlf/vlf-search.el
+++ b/packages/vlf/vlf-search.el
@@ -34,7 +34,9 @@
BATCH-STEP is amount of overlap between successive chunks."
(if (<= count 0)
(error "Count must be positive"))
- (let* ((tramp-verbose (min 2 tramp-verbose))
+ (run-hook-with-args 'vlf-before-batch-functions 'search)
+ (let* ((tramp-verbose (if (boundp 'tramp-verbose)
+ (min tramp-verbose 2)))
(case-fold-search t)
(match-chunk-start vlf-start-pos)
(match-chunk-end vlf-end-pos)
@@ -118,13 +120,14 @@ BATCH-STEP is amount of overlap between successive
chunks."
count to-find)
(vlf-goto-match match-chunk-start match-chunk-end
match-start-pos match-end-pos
- count to-find))))))
+ count to-find))
+ (run-hook-with-args 'vlf-after-batch-functions 'search)))))
(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 \
+ "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."
@@ -179,8 +182,10 @@ Search is performed chunk by chunk in `vlf-batch-size'
memory."
"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: "))))
+ (run-hook-with-args 'vlf-before-batch-functions 'goto-line)
(vlf-verify-size)
- (let ((tramp-verbose (min 2 tramp-verbose))
+ (let ((tramp-verbose (if (boundp 'tramp-verbose)
+ (min tramp-verbose 2)))
(start-pos vlf-start-pos)
(end-pos vlf-end-pos)
(pos (point))
@@ -243,8 +248,10 @@ Search is performed chunk by chunk in `vlf-batch-size'
memory."
(unless success
(vlf-with-undo-disabled
(vlf-move-to-chunk-2 start-pos end-pos))
+ (vlf-update-buffer-name)
(goto-char pos)
- (message "Unable to find line")))))
+ (message "Unable to find line"))
+ (run-hook-with-args 'vlf-after-batch-functions 'goto-line))))
(provide 'vlf-search)
diff --git a/packages/vlf/vlf-write.el b/packages/vlf/vlf-write.el
index e8549a7..1c5db49 100644
--- a/packages/vlf/vlf-write.el
+++ b/packages/vlf/vlf-write.el
@@ -33,40 +33,42 @@
"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 ((tramp-verbose (min 2 tramp-verbose))
- (pos (point))
- (font-lock font-lock-mode))
- (font-lock-mode 0)
- (if (< 0 size-change)
- (vlf-file-shift-back size-change)
- (vlf-file-shift-forward (- size-change)))
- (if font-lock (font-lock-mode 1))
- (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))))))
+ (when (and (buffer-modified-p)
+ (or (verify-visited-file-modtime (current-buffer))
+ (y-or-n-p "File has changed since visited or saved.\
+ Save anyway? ")))
+ (run-hook-with-args 'vlf-before-batch-functions 'write)
+ (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 ((tramp-verbose (if (boundp 'tramp-verbose)
+ (min tramp-verbose 2)))
+ (pos (point))
+ (font-lock font-lock-mode))
+ (font-lock-mode 0)
+ (if (< 0 size-change)
+ (vlf-file-shift-back size-change)
+ (vlf-file-shift-forward (- size-change)))
+ (if font-lock (font-lock-mode 1))
+ (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)))))
+ (run-hook-with-args 'vlf-after-batch-functions 'write))
t)
(defun vlf-file-shift-back (size-change)
diff --git a/packages/vlf/vlf.el b/packages/vlf/vlf.el
index 18f274b..f90b770 100644
--- a/packages/vlf/vlf.el
+++ b/packages/vlf/vlf.el
@@ -2,7 +2,7 @@
;; Copyright (C) 2006, 2012-2014 Free Software Foundation, Inc.
-;; Version: 1.4
+;; Version: 1.5
;; Keywords: large files, utilities
;; Maintainer: Andrey Kotlarski <m00nati...@gmail.com>
;; Authors: 2006 Mathias Dahl <mathias.d...@gmail.com>
@@ -39,6 +39,21 @@
;;; Code:
+(defgroup vlf nil "View Large Files in Emacs."
+ :prefix "vlf-" :group 'files)
+
+(defcustom vlf-before-batch-functions nil
+ "Hook that runs before multiple batch operations.
+One argument is supplied that specifies current action. Possible
+values are: `write', `ediff', `occur', `search', `goto-line'."
+ :group 'vlf :type 'hook)
+
+(defcustom vlf-after-batch-functions nil
+ "Hook that runs after multiple batch operations.
+One argument is supplied that specifies current action. Possible
+values are: `write', `ediff', `occur', `search', `goto-line'."
+ :group 'vlf :type 'hook)
+
(require 'vlf-base)
(autoload 'vlf-write "vlf-write" "Write current chunk to file." t)
@@ -86,37 +101,48 @@
(define-minor-mode vlf-mode
"Mode to browse large files in."
- :lighter " VLF"
- :group 'vlf
- :keymap vlf-prefix-map
- (if vlf-mode
- (progn
- (set (make-local-variable 'require-final-newline) nil)
- (add-hook 'write-file-functions 'vlf-write nil t)
- (set (make-local-variable 'revert-buffer-function)
- 'vlf-revert)
- (make-local-variable 'vlf-batch-size)
- (setq vlf-file-size (vlf-get-file-size buffer-file-truename)
- vlf-start-pos 0
- vlf-end-pos 0)
- (let* ((pos (position-bytes (point)))
- (start (* (/ pos vlf-batch-size) vlf-batch-size)))
- (goto-char (byte-to-position (- pos start)))
- (vlf-move-to-batch start)))
- (kill-local-variable 'revert-buffer-function)
- (vlf-stop-follow)
- (when (or (not large-file-warning-threshold)
- (< vlf-file-size large-file-warning-threshold)
- (y-or-n-p (format "Load whole file (%s)? "
- (file-size-human-readable
- vlf-file-size))))
- (kill-local-variable 'require-final-newline)
- (remove-hook 'write-file-functions 'vlf-write t)
- (let ((pos (+ vlf-start-pos (position-bytes (point)))))
- (vlf-with-undo-disabled
- (insert-file-contents buffer-file-name t nil nil t))
- (goto-char (byte-to-position pos)))
- (rename-buffer (file-name-nondirectory buffer-file-name) t))))
+ :lighter " VLF" :group 'vlf :keymap vlf-prefix-map
+ (cond (vlf-mode
+ (set (make-local-variable 'require-final-newline) nil)
+ (add-hook 'write-file-functions 'vlf-write nil t)
+ (set (make-local-variable 'revert-buffer-function)
+ 'vlf-revert)
+ (make-local-variable 'vlf-batch-size)
+ (setq vlf-file-size (vlf-get-file-size buffer-file-truename)
+ vlf-start-pos 0
+ vlf-end-pos 0)
+ (let* ((pos (position-bytes (point)))
+ (start (* (/ pos vlf-batch-size) vlf-batch-size)))
+ (goto-char (byte-to-position (- pos start)))
+ (vlf-move-to-batch start))
+ (add-hook 'after-change-major-mode-hook 'vlf-keep-alive t t)
+ (vlf-keep-alive))
+ ((or (not large-file-warning-threshold)
+ (< vlf-file-size large-file-warning-threshold)
+ (y-or-n-p (format "Load whole file (%s)? "
+ (file-size-human-readable
+ vlf-file-size))))
+ (kill-local-variable 'revert-buffer-function)
+ (vlf-stop-follow)
+ (kill-local-variable 'require-final-newline)
+ (remove-hook 'write-file-functions 'vlf-write t)
+ (remove-hook 'after-change-major-mode-hook
+ 'vlf-keep-alive t)
+ (let ((hexl (eq major-mode 'hexl-mode)))
+ (if hexl (hexl-mode-exit))
+ (let ((pos (+ vlf-start-pos (position-bytes (point)))))
+ (vlf-with-undo-disabled
+ (insert-file-contents buffer-file-name t nil nil t))
+ (goto-char (byte-to-position pos)))
+ (if hexl (hexl-mode)))
+ (rename-buffer (file-name-nondirectory buffer-file-name) t))
+ (t (setq vlf-mode t))))
+
+(defun vlf-keep-alive ()
+ "Keep `vlf-mode' on major mode change."
+ (if (eq major-mode 'hexl-mode)
+ (set (make-local-variable 'revert-buffer-function) 'vlf-revert))
+ (setq vlf-mode t))
;;;###autoload
(defun vlf (file)
@@ -180,6 +206,51 @@ When prefix argument is negative
(goto-char (point-max)))
ad-do-it))
+;; hexl mode integration
+(defun vlf-hexl-before (&optional operation)
+ "Temporarily disable `hexl-mode' for OPERATION."
+ (when (eq major-mode 'hexl-mode)
+ (hexl-mode-exit)
+ (set (make-local-variable 'vlf-restore-hexl-mode) operation)))
+
+(defun vlf-hexl-after (&optional operation)
+ "Re-enable `hexl-mode' if active before OPERATION."
+ (when (and (boundp 'vlf-restore-hexl-mode)
+ (eq vlf-restore-hexl-mode operation))
+ (hexl-mode)
+ (kill-local-variable 'vlf-restore-hexl-mode)))
+
+(add-hook 'vlf-before-batch-functions 'vlf-hexl-before)
+(add-hook 'vlf-after-batch-functions 'vlf-hexl-after)
+(add-hook 'vlf-before-chunk-update 'vlf-hexl-before)
+(add-hook 'vlf-after-chunk-update 'vlf-hexl-after)
+
+(eval-after-load "hexl"
+ '(progn
+ (defadvice hexl-save-buffer (around vlf-hexl-save
+ activate compile)
+ "Prevent hexl save if `vlf-mode' is active."
+ (if vlf-mode
+ (vlf-write)
+ ad-do-it))
+
+ (defadvice hexl-scroll-up (around vlf-hexl-scroll-up
+ activate compile)
+ "Slide to next batch if at end of buffer in `vlf-mode'."
+ (if (and vlf-mode (pos-visible-in-window-p (point-max))
+ (or (not (numberp arg)) (< 0 arg)))
+ (progn (vlf-next-batch 1)
+ (goto-char (point-min)))
+ ad-do-it))
+
+ (defadvice hexl-scroll-down (around vlf-hexl-scroll-down
+ activate compile)
+ "Slide to previous batch if at beginning of buffer in `vlf-mode'."
+ (if (and vlf-mode (pos-visible-in-window-p (point-min)))
+ (progn (vlf-prev-batch 1)
+ (goto-char (point-max)))
+ ad-do-it))))
+
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; utilities
