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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
This commit is contained in:
Andrey Kotlarski
parent
78cd8fc143
commit
2d0709beca
@ -1,3 +1,4 @@
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* View Large File
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An Emacs mode that allows viewing files in chunks.
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An Emacs mode that allows viewing files in chunks. This is a fork
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that builds on the GNU ELPA vlf.el.
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127
vlf.el
127
vlf.el
@ -2,10 +2,11 @@
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;; Copyright (C) 2006, 2012 Free Software Foundation, Inc.
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;; Version: 0.2
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;; Version: 0.3
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;; Keywords: large files, utilities
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;; Authors: 2006 Mathias Dahl <mathias.dahl@gmail.com>
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;; 2012 Sam Steingold <sds@gnu.org>
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;; 2013 Andrey Kotlarski <m00naticus@gmail.com>
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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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@ -57,6 +58,10 @@
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(define-key map [M-next] 'vlf-next-batch)
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(define-key map [M-prior] 'vlf-prev-batch)
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(define-key map (kbd "C-+") 'vlf-change-batch-size)
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(define-key map (kbd "C--")
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(lambda () "Decrease vlf batch size by factor of 2."
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(interactive)
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(vlf-change-batch-size t)))
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map)
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"Keymap for `vlf-mode'.")
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@ -71,22 +76,22 @@
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(defun vlf-change-batch-size (decrease)
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"Change the buffer-local value of `vlf-batch-size'.
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Normally, the value is doubled;
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with the prefix argument it is halved."
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with the prefix argument DECREASE it is halved."
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(interactive "P")
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(or (assq 'vlf-batch-size (buffer-local-variables))
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(error "%s is not local in this buffer" 'vlf-batch-size))
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(setq vlf-batch-size
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(if decrease
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(/ vlf-batch-size 2)
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(* vlf-batch-size 2)))
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(if decrease
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(/ vlf-batch-size 2)
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(* vlf-batch-size 2)))
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(vlf-update-buffer-name))
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(defun vlf-format-buffer-name ()
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"Return format for vlf buffer name."
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(format "%s(%s)[%d,%d](%d)"
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(file-name-nondirectory buffer-file-name)
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(file-size-human-readable vlf-file-size)
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vlf-start-pos vlf-end-pos vlf-batch-size))
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(file-name-nondirectory buffer-file-name)
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(file-size-human-readable vlf-file-size)
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vlf-start-pos vlf-end-pos vlf-batch-size))
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(defun vlf-update-buffer-name ()
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"Update the current buffer name."
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@ -94,65 +99,91 @@ with the prefix argument it is halved."
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(defun vlf-next-batch (append)
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"Display the next batch of file data.
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Append to the existing buffer when the prefix argument is supplied."
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(interactive "P")
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(when (= vlf-end-pos vlf-file-size)
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(error "Already at EOF"))
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(let ((inhibit-read-only t)
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(end (min vlf-file-size (+ vlf-end-pos vlf-batch-size))))
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(goto-char (point-max))
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;; replacing `erase-buffer' with replace arg to `insert-file-contents'
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;; hangs emacs
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(unless append (erase-buffer))
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(insert-file-contents buffer-file-name nil vlf-end-pos end)
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(unless append
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(setq vlf-start-pos vlf-end-pos))
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(setq vlf-end-pos end)
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(set-buffer-modified-p nil)
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(vlf-update-buffer-name)))
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When prefix argument is supplied and positive
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jump over APPEND number of batches.
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When prefix argument is negative
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append next APPEND number of batches to the existing buffer."
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(interactive "p")
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(let ((end (+ vlf-end-pos (* vlf-batch-size
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(abs append)))))
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(when (< vlf-file-size end) ; re-check file size
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(setq vlf-file-size (nth 7 (file-attributes buffer-file-name)))
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(cond ((= vlf-end-pos vlf-file-size)
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(error "Already at EOF"))
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((< vlf-file-size end)
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(setq end vlf-file-size))))
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(let ((inhibit-read-only t)
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(do-append (< append 0)))
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(if do-append
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(goto-char (point-max))
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(setq vlf-start-pos (- end vlf-batch-size))
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(erase-buffer))
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(insert-file-contents buffer-file-name nil
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(if do-append
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vlf-end-pos
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vlf-start-pos)
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end))
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(setq vlf-end-pos end))
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(set-buffer-modified-p nil)
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(vlf-update-buffer-name))
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(defun vlf-prev-batch (prepend)
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"Display the previous batch of file data.
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Prepend to the existing buffer when the prefix argument is supplied."
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(interactive "P")
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(when (= vlf-start-pos 0)
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(error "Already at BOF"))
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When prefix argument is supplied and positive
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jump over PREPEND number of batches.
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When prefix argument is negative
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append previous PREPEND number of batches to the existing buffer."
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(interactive "p")
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(if (zerop vlf-start-pos)
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(error "Already at BOF"))
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(let ((inhibit-read-only t)
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(start (max 0 (- vlf-start-pos vlf-batch-size))))
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(goto-char (point-min))
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(unless prepend (erase-buffer))
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(insert-file-contents buffer-file-name nil start vlf-start-pos)
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(unless prepend
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(setq vlf-end-pos vlf-start-pos))
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(setq vlf-start-pos start)
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(set-buffer-modified-p nil)
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(vlf-update-buffer-name)))
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(start (max 0 (- vlf-start-pos (* vlf-batch-size
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(abs prepend)))))
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(do-prepend (< prepend 0)))
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(if do-prepend
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(goto-char (point-min))
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(setq vlf-end-pos (+ start vlf-batch-size))
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(erase-buffer))
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(insert-file-contents buffer-file-name nil start
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(if do-prepend
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vlf-start-pos
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vlf-end-pos))
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(setq vlf-start-pos start))
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(set-buffer-modified-p nil)
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(vlf-update-buffer-name))
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(defun vlf (file)
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;;;###autoload
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(defun vlf (from-end file)
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"View a Large File in Emacs.
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With FROM-END prefix, view from the back.
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FILE is the file to open.
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Batches of the file data from FILE will be displayed in a
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read-only buffer.
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You can customize the number of bytes to
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display by customizing `vlf-batch-size'."
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(interactive "fFile to open: ")
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(interactive "P\nfFile to open: ")
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(with-current-buffer (generate-new-buffer "*vlf*")
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(setq buffer-file-name file
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vlf-start-pos 0
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vlf-end-pos vlf-batch-size
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vlf-file-size (nth 7 (file-attributes file)))
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vlf-file-size (nth 7 (file-attributes file)))
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(if from-end
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(setq vlf-start-pos (max 0 (- vlf-file-size vlf-batch-size))
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vlf-end-pos vlf-file-size)
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(setq vlf-start-pos 0
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vlf-end-pos (min vlf-batch-size vlf-file-size)))
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(vlf-update-buffer-name)
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(insert-file-contents buffer-file-name nil
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vlf-start-pos vlf-end-pos nil)
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vlf-start-pos vlf-end-pos)
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(vlf-mode)
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(display-buffer (current-buffer))))
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(defun dired-vlf ()
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"In Dired, visit the file on this line in VLF mode."
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(interactive)
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(vlf (dired-get-file-for-visit)))
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(defun dired-vlf (from-end)
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"In Dired, visit the file on this line in VLF mode.
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With FROM-END prefix, view from the back."
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(interactive "P")
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(vlf from-end (dired-get-file-for-visit)))
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(eval-after-load "dired" '(define-key dired-mode-map "V" 'dired-vlf))
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(eval-after-load "dired"
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'(define-key dired-mode-map "V" 'dired-vlf))
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;;;; ChangeLog:
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