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[elpa] externals/vlf 2d0709b 003/310: Improvements to the existing funct
From: |
Stefan Monnier |
Subject: |
[elpa] externals/vlf 2d0709b 003/310: Improvements to the existing functionality: |
Date: |
Sat, 28 Nov 2020 00:32:35 -0500 (EST) |
branch: externals/vlf
commit 2d0709beca09c1547a1cc1781c6a67fb0db15f73
Author: Andrey Kotlarski <m00naticus@gmail.com>
Commit: Andrey Kotlarski <m00naticus@gmail.com>
Improvements to the existing functionality:
- option to start viewing from the end of file
- ability to jump/insert given number of batches at once
- ability to view newly added content if the file has grown meanwhile
---
README.org | 3 +-
vlf.el | 129 ++++++++++++++++++++++++++++++++++++++-----------------------
2 files changed, 82 insertions(+), 50 deletions(-)
diff --git a/README.org b/README.org
index 58fbcdd..8b174c5 100644
--- a/README.org
+++ b/README.org
@@ -1,3 +1,4 @@
* View Large File
-An Emacs mode that allows viewing files in chunks.
+An Emacs mode that allows viewing files in chunks. This is a fork
+that builds on the GNU ELPA vlf.el.
diff --git a/vlf.el b/vlf.el
index e7150e9..33d1d37 100644
--- a/vlf.el
+++ b/vlf.el
@@ -2,10 +2,11 @@
;; Copyright (C) 2006, 2012 Free Software Foundation, Inc.
-;; Version: 0.2
+;; Version: 0.3
;; Keywords: large files, utilities
;; Authors: 2006 Mathias Dahl <mathias.dahl@gmail.com>
;; 2012 Sam Steingold <sds@gnu.org>
+;; 2013 Andrey Kotlarski <m00naticus@gmail.com>
;; 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
@@ -57,6 +58,10 @@
(define-key map [M-next] 'vlf-next-batch)
(define-key map [M-prior] 'vlf-prev-batch)
(define-key map (kbd "C-+") 'vlf-change-batch-size)
+ (define-key map (kbd "C--")
+ (lambda () "Decrease vlf batch size by factor of 2."
+ (interactive)
+ (vlf-change-batch-size t)))
map)
"Keymap for `vlf-mode'.")
@@ -71,22 +76,22 @@
(defun vlf-change-batch-size (decrease)
"Change the buffer-local value of `vlf-batch-size'.
Normally, the value is doubled;
-with the prefix argument it is halved."
+with the prefix argument DECREASE it is halved."
(interactive "P")
(or (assq 'vlf-batch-size (buffer-local-variables))
(error "%s is not local in this buffer" 'vlf-batch-size))
(setq vlf-batch-size
- (if decrease
- (/ vlf-batch-size 2)
- (* vlf-batch-size 2)))
+ (if decrease
+ (/ vlf-batch-size 2)
+ (* vlf-batch-size 2)))
(vlf-update-buffer-name))
(defun vlf-format-buffer-name ()
"Return format for vlf buffer name."
(format "%s(%s)[%d,%d](%d)"
- (file-name-nondirectory buffer-file-name)
- (file-size-human-readable vlf-file-size)
- vlf-start-pos vlf-end-pos vlf-batch-size))
+ (file-name-nondirectory buffer-file-name)
+ (file-size-human-readable vlf-file-size)
+ vlf-start-pos vlf-end-pos vlf-batch-size))
(defun vlf-update-buffer-name ()
"Update the current buffer name."
@@ -94,65 +99,91 @@ with the prefix argument it is halved."
(defun vlf-next-batch (append)
"Display the next batch of file data.
-Append to the existing buffer when the prefix argument is supplied."
- (interactive "P")
- (when (= vlf-end-pos vlf-file-size)
- (error "Already at EOF"))
- (let ((inhibit-read-only t)
- (end (min vlf-file-size (+ vlf-end-pos vlf-batch-size))))
- (goto-char (point-max))
- ;; replacing `erase-buffer' with replace arg to `insert-file-contents'
- ;; hangs emacs
- (unless append (erase-buffer))
- (insert-file-contents buffer-file-name nil vlf-end-pos end)
- (unless append
- (setq vlf-start-pos vlf-end-pos))
- (setq vlf-end-pos end)
- (set-buffer-modified-p nil)
- (vlf-update-buffer-name)))
+When prefix argument is supplied and positive
+ jump over APPEND number of batches.
+When prefix argument is negative
+ append next APPEND number of batches to the existing buffer."
+ (interactive "p")
+ (let ((end (+ vlf-end-pos (* vlf-batch-size
+ (abs append)))))
+ (when (< vlf-file-size end) ; re-check file size
+ (setq vlf-file-size (nth 7 (file-attributes buffer-file-name)))
+ (cond ((= vlf-end-pos vlf-file-size)
+ (error "Already at EOF"))
+ ((< vlf-file-size end)
+ (setq end vlf-file-size))))
+ (let ((inhibit-read-only t)
+ (do-append (< append 0)))
+ (if do-append
+ (goto-char (point-max))
+ (setq vlf-start-pos (- end vlf-batch-size))
+ (erase-buffer))
+ (insert-file-contents buffer-file-name nil
+ (if do-append
+ vlf-end-pos
+ vlf-start-pos)
+ end))
+ (setq vlf-end-pos end))
+ (set-buffer-modified-p nil)
+ (vlf-update-buffer-name))
(defun vlf-prev-batch (prepend)
"Display the previous batch of file data.
-Prepend to the existing buffer when the prefix argument is supplied."
- (interactive "P")
- (when (= vlf-start-pos 0)
- (error "Already at BOF"))
+When prefix argument is supplied and positive
+ jump over PREPEND number of batches.
+When prefix argument is negative
+ append previous PREPEND number of batches to the existing buffer."
+ (interactive "p")
+ (if (zerop vlf-start-pos)
+ (error "Already at BOF"))
(let ((inhibit-read-only t)
- (start (max 0 (- vlf-start-pos vlf-batch-size))))
- (goto-char (point-min))
- (unless prepend (erase-buffer))
- (insert-file-contents buffer-file-name nil start vlf-start-pos)
- (unless prepend
- (setq vlf-end-pos vlf-start-pos))
- (setq vlf-start-pos start)
- (set-buffer-modified-p nil)
- (vlf-update-buffer-name)))
-
-(defun vlf (file)
+ (start (max 0 (- vlf-start-pos (* vlf-batch-size
+ (abs prepend)))))
+ (do-prepend (< prepend 0)))
+ (if do-prepend
+ (goto-char (point-min))
+ (setq vlf-end-pos (+ start vlf-batch-size))
+ (erase-buffer))
+ (insert-file-contents buffer-file-name nil start
+ (if do-prepend
+ vlf-start-pos
+ vlf-end-pos))
+ (setq vlf-start-pos start))
+ (set-buffer-modified-p nil)
+ (vlf-update-buffer-name))
+
+;;;###autoload
+(defun vlf (from-end file)
"View a Large File in Emacs.
+With FROM-END prefix, view from the back.
FILE is the file to open.
Batches of the file data from FILE will be displayed in a
read-only buffer.
You can customize the number of bytes to
display by customizing `vlf-batch-size'."
- (interactive "fFile to open: ")
+ (interactive "P\nfFile to open: ")
(with-current-buffer (generate-new-buffer "*vlf*")
(setq buffer-file-name file
- vlf-start-pos 0
- vlf-end-pos vlf-batch-size
- vlf-file-size (nth 7 (file-attributes file)))
+ vlf-file-size (nth 7 (file-attributes file)))
+ (if from-end
+ (setq vlf-start-pos (max 0 (- vlf-file-size vlf-batch-size))
+ vlf-end-pos vlf-file-size)
+ (setq vlf-start-pos 0
+ vlf-end-pos (min vlf-batch-size vlf-file-size)))
(vlf-update-buffer-name)
(insert-file-contents buffer-file-name nil
- vlf-start-pos vlf-end-pos nil)
+ vlf-start-pos vlf-end-pos)
(vlf-mode)
(display-buffer (current-buffer))))
-(defun dired-vlf ()
- "In Dired, visit the file on this line in VLF mode."
- (interactive)
- (vlf (dired-get-file-for-visit)))
+(defun dired-vlf (from-end)
+ "In Dired, visit the file on this line in VLF mode.
+With FROM-END prefix, view from the back."
+ (interactive "P")
+ (vlf from-end (dired-get-file-for-visit)))
-(eval-after-load "dired" '(define-key dired-mode-map "V" 'dired-vlf))
+(eval-after-load "dired"
+ '(define-key dired-mode-map "V" 'dired-vlf))
;;;; ChangeLog:
- [elpa] externals/vlf ca13bea 101/310: Try utf-8 and if not successful, auto detect when adjusting chunk for, (continued)
- [elpa] externals/vlf ca13bea 101/310: Try utf-8 and if not successful, auto detect when adjusting chunk for, Stefan Monnier, 2020/11/28
- [elpa] externals/vlf ae775f8 107/310: Extend vlfi-goto-line to count lines from the end with negative, Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 36d2ed4 109/310: Update README., Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 3c2fb6b 111/310: Merge branch 'master' into chunk-opt2, Stefan Monnier, 2020/11/28
- [elpa] externals/vlf a0b8d5f 115/310: Merge pull request #3 from danlamanna/master, Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 8ed9192 117/310: Review fixes:, Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 298d8f5 118/310: Keep track of current batch encoded size and allow fluctuation when, Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 563d9ca 119/310: Fix vlfi-revert to revert on user confirmation., Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 34dfbd2 121/310: Use set-visited-file-name and abstract getting current file size and, Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 6a1919d 001/310: Initial commit - original state of GNU ELPA vlf.el., Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 2d0709b 003/310: Improvements to the existing functionality:,
Stefan Monnier <=
- [elpa] externals/vlf 59d5d2c 008/310: Add lexical-bind declaration., Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 782b7e4 009/310: Make filename argument of `vlf-if-file-too-large' optional so it at, Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 375c96f 018/310: Add backward whole file search., Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 30e4959 019/310: Add direct jumps to first and last chunks., Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 42693f6 026/310: Update README., Stefan Monnier, 2020/11/28
- [elpa] externals/vlf ac382e9 032/310: Add temporary highlight of match., Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 9abee04 038/310: Merge branch 'master' into edit, Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 0ff2f3e 040/310: Merge branch 'master' into edit, Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 1948f3e 041/310: Make VLFI edit mode actually working., Stefan Monnier, 2020/11/28
- [elpa] externals/vlf 5405a30 045/310: Intercept buffer saving with vlfi-write., Stefan Monnier, 2020/11/28