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;;; vlfi.el --- View Large Files Improved
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;;; -*- lexical-bind: t -*-
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;; Copyright (C) 2006, 2012, 2013 Free Software Foundation, Inc.
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2013-03-31 18:44:41 +01:00
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;; Version: 0.4
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2013-01-12 15:05:25 +00:00
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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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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; This file is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This package provides the M-x vlfi command, which visits part of a
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;; large file in a read-only buffer without visiting the entire file.
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;; The buffer uses VLFI mode, which defines the commands M-<next>
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;; (vlfi-next-batch) and M-<prior> (vlfi-prev-batch) to visit other
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;; parts of the file. The option `vlfi-batch-size' specifies the size
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;; of each batch, in bytes.
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;; This package is an improved fork of the vlf.el package.
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;;; Code:
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(defgroup vlfi nil
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"View Large Files in Emacs."
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:prefix "vlfi-"
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:group 'files)
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(defcustom vlfi-batch-size 1024
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"Defines how large each batch of file data is (in bytes)."
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:type 'integer
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:group 'vlfi)
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;; Keep track of file position.
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(defvar vlfi-start-pos 0
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"Absolute position of the visible chunk start.")
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(defvar vlfi-end-pos vlfi-batch-size
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"Absolute position of the visible chunk end.")
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(defvar vlfi-file-size 0 "Total size of presented file.")
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(defvar vlfi-mode-map
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(let ((map (make-sparse-keymap)))
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(define-key map [M-next] 'vlfi-next-batch)
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(define-key map [M-prior] 'vlfi-prev-batch)
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(define-key map "+" 'vlfi-change-batch-size)
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(define-key map "-"
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(lambda () "Decrease vlfi batch size by factor of 2."
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(interactive)
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(vlfi-change-batch-size t)))
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(define-key map "s" 'vlfi-re-search-forward)
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(define-key map "r" 'vlfi-re-search-backward)
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(define-key map ">" (lambda () "Jump to end of file content."
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(interactive)
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(vlfi-insert-file buffer-file-name t)))
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(define-key map "<" (lambda () "Jump to beginning of file content."
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(interactive)
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(vlfi-insert-file buffer-file-name)))
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(define-key map "e" 'vlfi-edit-mode)
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map)
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"Keymap for `vlfi-mode'.")
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(define-derived-mode vlfi-mode special-mode "VLFI"
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"Mode to browse large files in."
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(setq buffer-read-only t)
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(set-buffer-modified-p nil)
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(buffer-disable-undo)
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(make-local-variable 'vlfi-batch-size)
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(make-local-variable 'vlfi-start-pos)
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(make-local-variable 'vlfi-end-pos)
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(make-local-variable 'vlfi-file-size)
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;; (vlfi-print-vars)
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)
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(defun vlfi-change-batch-size (decrease)
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"Change the buffer-local value of `vlfi-batch-size'.
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Normally, the value is doubled;
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with the prefix argument DECREASE it is halved."
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(interactive "P")
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(or (assq 'vlfi-batch-size (buffer-local-variables))
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(error "%s is not local in this buffer" 'vlfi-batch-size))
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(setq vlfi-batch-size (if decrease
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(/ vlfi-batch-size 2)
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(* vlfi-batch-size 2)))
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(vlfi-move-to-batch vlfi-start-pos))
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(defun vlfi-format-buffer-name ()
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"Return format for vlfi buffer name."
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(format "%s(%s)[%.2f%%%%](%d)"
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(file-name-nondirectory buffer-file-name)
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(file-size-human-readable vlfi-file-size)
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(/ (* 100 vlfi-end-pos) (float vlfi-file-size))
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vlfi-batch-size))
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(defun vlfi-update-buffer-name ()
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"Update the current buffer name."
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(rename-buffer (vlfi-format-buffer-name) t))
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(defun vlfi-next-batch (append)
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"Display the next batch of file data.
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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 (+ vlfi-end-pos (* vlfi-batch-size
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(abs append)))))
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(when (< vlfi-file-size end) ; re-check file size
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(setq vlfi-file-size (nth 7 (file-attributes buffer-file-name)))
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(cond ((= vlfi-end-pos vlfi-file-size)
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(error "Already at EOF"))
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((< vlfi-file-size end)
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(setq end vlfi-file-size))))
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(let ((inhibit-read-only t)
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(do-append (< append 0))
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(pos (point)))
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(if do-append
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(goto-char (point-max))
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(setq vlfi-start-pos (- end vlfi-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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vlfi-end-pos
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vlfi-start-pos)
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end)
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(goto-char pos))
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(setq vlfi-end-pos end))
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(set-buffer-modified-p nil)
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(vlfi-update-buffer-name))
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(defun vlfi-prev-batch (prepend)
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"Display the previous batch of file data.
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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 vlfi-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 (- vlfi-start-pos (* vlfi-batch-size
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(abs prepend)))))
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(do-prepend (< prepend 0))
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(pos (- (point-max) (point))))
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(if do-prepend
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(goto-char (point-min))
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(setq vlfi-end-pos (+ start vlfi-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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vlfi-start-pos
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vlfi-end-pos))
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(goto-char (- (point-max) pos))
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(setq vlfi-start-pos start))
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(set-buffer-modified-p nil)
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(vlfi-update-buffer-name))
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(defun vlfi-move-to-batch (start)
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"Move to batch determined by START.
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Adjust according to file start/end and show `vlfi-batch-size' bytes."
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(setq vlfi-start-pos (max 0 start)
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vlfi-end-pos (+ vlfi-start-pos vlfi-batch-size))
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(if (< vlfi-file-size vlfi-end-pos) ; re-check file size
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(setq vlfi-file-size
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(nth 7 (file-attributes buffer-file-name))
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vlfi-end-pos (min vlfi-end-pos vlfi-file-size)
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vlfi-start-pos (max 0 (- vlfi-end-pos vlfi-batch-size))))
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(let ((inhibit-read-only t))
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(erase-buffer)
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(insert-file-contents buffer-file-name nil
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vlfi-start-pos vlfi-end-pos))
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(set-buffer-modified-p nil)
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(vlfi-update-buffer-name))
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(defun vlfi-move-to-chunk (start end)
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"Move to chunk determined by START END."
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(if (< vlfi-file-size end) ; re-check file size
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(setq vlfi-file-size (nth 7
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(file-attributes buffer-file-name))))
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(setq vlfi-start-pos (max 0 start)
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vlfi-end-pos (min end vlfi-file-size))
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(let ((inhibit-read-only t))
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(erase-buffer)
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(insert-file-contents buffer-file-name nil
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vlfi-start-pos vlfi-end-pos))
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(set-buffer-modified-p nil)
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(vlfi-update-buffer-name))
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(defun vlfi-insert-file (file &optional from-end)
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"Insert first chunk of FILE contents in current buffer.
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With FROM-END prefix, start from the back."
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(if from-end
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(setq vlfi-start-pos (max 0 (- vlfi-file-size vlfi-batch-size))
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vlfi-end-pos vlfi-file-size)
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(setq vlfi-start-pos 0
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vlfi-end-pos (min vlfi-batch-size vlfi-file-size)))
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(vlfi-move-to-chunk vlfi-start-pos vlfi-end-pos))
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;;;###autoload
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(defun vlfi (file &optional from-end)
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"View Large FILE. With FROM-END prefix, view from the back.
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Batches of the file data from FILE will be displayed in a read-only
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buffer. You can customize number of bytes displayed by customizing
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`vlfi-batch-size'."
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(interactive "fFile to open: \nP")
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(with-current-buffer (generate-new-buffer "*vlfi*")
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(setq buffer-file-name file
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vlfi-file-size (nth 7 (file-attributes file)))
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(vlfi-insert-file file from-end)
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(vlfi-mode)
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(switch-to-buffer (current-buffer))))
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;;;###autoload
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(defun dired-vlfi (from-end)
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"In Dired, visit the file on this line in VLFI mode.
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With FROM-END prefix, view from the back."
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(interactive "P")
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(vlfi (dired-get-file-for-visit) from-end))
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;;;###autoload
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(eval-after-load "dired"
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'(define-key dired-mode-map "V" 'dired-vlfi))
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;;;###autoload
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(defun vlfi-if-file-too-large (size op-type &optional filename)
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"If file SIZE larger than `large-file-warning-threshold', \
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allow user to view file with `vlfi', open it normally or abort.
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OP-TYPE specifies the file operation being performed over FILENAME."
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(and large-file-warning-threshold size
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(> size large-file-warning-threshold)
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(let ((char nil))
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(while (not (memq (setq char
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(read-event
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(propertize
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(format "File %s is large (%s): \
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%s normally (o), %s with vlfi (v) or abort (a)"
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(file-name-nondirectory filename)
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(file-size-human-readable size)
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op-type op-type)
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'face 'minibuffer-prompt)))
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'(?o ?O ?v ?V ?a ?A))))
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|
|
(cond ((memq char '(?o ?O)))
|
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|
|
((memq char '(?v ?V))
|
2013-02-02 14:12:30 +00:00
|
|
|
(vlfi nil filename)
|
2013-01-13 13:45:55 +00:00
|
|
|
(error ""))
|
|
|
|
((memq char '(?a ?A))
|
|
|
|
(error "Aborted"))))))
|
2013-01-12 16:12:45 +00:00
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|
2013-01-13 13:24:56 +00:00
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|
;;; hijack `abort-if-file-too-large'
|
2013-01-13 13:29:51 +00:00
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|
;;;###autoload
|
2013-02-02 14:12:30 +00:00
|
|
|
(fset 'abort-if-file-too-large 'vlfi-if-file-too-large)
|
2013-01-12 15:14:28 +00:00
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|
2013-04-01 01:09:32 +01:00
|
|
|
;;; search
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|
|
(defun vlfi-re-search (regexp count backward)
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|
|
"Search for REGEXP COUNT number of times forward or BACKWARD."
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|
|
(let* ((match-start-pos (+ vlfi-start-pos (point)))
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|
|
(match-end-pos match-start-pos)
|
|
|
|
(to-find count)
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|
|
|
(search-reporter (make-progress-reporter
|
|
|
|
(concat "Searching for " regexp)
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|
|
|
(if backward
|
|
|
|
(- vlfi-file-size vlfi-end-pos)
|
|
|
|
vlfi-start-pos)
|
|
|
|
vlfi-file-size))
|
2013-04-01 12:32:10 +01:00
|
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|
(batch-step (/ vlfi-batch-size 8))) ; amount of chunk overlap
|
2013-04-01 01:09:32 +01:00
|
|
|
(unwind-protect
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|
|
|
(catch 'end-of-file
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|
|
|
(if backward
|
|
|
|
(while (not (zerop to-find))
|
|
|
|
(cond ((re-search-backward regexp nil t)
|
2013-04-01 10:06:48 +01:00
|
|
|
(setq to-find (1- to-find)
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|
|
match-start-pos (+ vlfi-start-pos
|
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|
|
(match-beginning 0))
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|
|
|
match-end-pos (+ vlfi-start-pos
|
|
|
|
(match-end 0))))
|
2013-04-01 01:09:32 +01:00
|
|
|
((zerop vlfi-start-pos)
|
|
|
|
(throw 'end-of-file nil))
|
2013-04-01 12:32:10 +01:00
|
|
|
(t (let ((batch-move (- vlfi-start-pos
|
|
|
|
(- vlfi-batch-size
|
|
|
|
batch-step))))
|
2013-04-01 10:06:48 +01:00
|
|
|
(vlfi-move-to-batch
|
2013-04-01 12:32:10 +01:00
|
|
|
(if (< match-start-pos batch-move)
|
2013-04-01 10:06:48 +01:00
|
|
|
(- match-start-pos vlfi-batch-size)
|
2013-04-01 12:32:10 +01:00
|
|
|
batch-move)))
|
2013-04-01 01:09:32 +01:00
|
|
|
(goto-char (if (< match-start-pos
|
|
|
|
vlfi-end-pos)
|
|
|
|
(- match-start-pos
|
|
|
|
vlfi-start-pos)
|
|
|
|
(point-max)))
|
|
|
|
(progress-reporter-update search-reporter
|
|
|
|
vlfi-start-pos))))
|
|
|
|
(while (not (zerop to-find))
|
|
|
|
(cond ((re-search-forward regexp nil t)
|
2013-04-01 10:06:48 +01:00
|
|
|
(setq to-find (1- to-find)
|
|
|
|
match-start-pos (+ vlfi-start-pos
|
|
|
|
(match-beginning 0))
|
|
|
|
match-end-pos (+ vlfi-start-pos
|
|
|
|
(match-end 0))))
|
2013-04-01 01:09:32 +01:00
|
|
|
((= vlfi-end-pos vlfi-file-size)
|
|
|
|
(throw 'end-of-file nil))
|
2013-04-01 12:32:10 +01:00
|
|
|
(t (let ((batch-move (- vlfi-end-pos batch-step)))
|
2013-04-01 10:06:48 +01:00
|
|
|
(vlfi-move-to-batch
|
2013-04-01 12:32:10 +01:00
|
|
|
(if (< batch-move match-end-pos)
|
2013-04-01 10:06:48 +01:00
|
|
|
match-end-pos
|
2013-04-01 12:32:10 +01:00
|
|
|
batch-move)))
|
2013-04-01 01:09:32 +01:00
|
|
|
(goto-char (if (< vlfi-start-pos match-end-pos)
|
|
|
|
(- match-end-pos vlfi-start-pos)
|
|
|
|
(point-min)))
|
|
|
|
(progress-reporter-update search-reporter
|
|
|
|
vlfi-end-pos)))))
|
|
|
|
(progress-reporter-done search-reporter))
|
2013-04-01 10:57:58 +01:00
|
|
|
(if backward
|
2013-04-01 12:38:50 +01:00
|
|
|
(vlfi-goto-match match-end-pos match-start-pos
|
2013-04-01 10:57:58 +01:00
|
|
|
count to-find)
|
2013-04-01 12:38:50 +01:00
|
|
|
(vlfi-goto-match match-start-pos match-end-pos
|
2013-04-01 10:57:58 +01:00
|
|
|
count to-find)))))
|
|
|
|
|
2013-04-01 12:38:50 +01:00
|
|
|
(defun vlfi-goto-match (match-pos-start match-pos-end count to-find)
|
2013-04-01 10:57:58 +01:00
|
|
|
"Move to chunk surrounding MATCH-POS-START and MATCH-POS-END.
|
2013-04-01 12:38:50 +01:00
|
|
|
According to COUNT and left TO-FIND, show if search has been
|
2013-04-01 01:09:32 +01:00
|
|
|
successful. Return nil if nothing found."
|
2013-04-01 10:57:58 +01:00
|
|
|
(vlfi-move-to-batch (- match-pos-start (/ vlfi-batch-size 2)))
|
|
|
|
(let* ((match-end (- match-pos-end vlfi-start-pos))
|
|
|
|
(overlay (make-overlay (- match-pos-start vlfi-start-pos)
|
|
|
|
match-end)))
|
|
|
|
(overlay-put overlay 'face 'region)
|
|
|
|
(goto-char match-end)
|
2013-04-01 12:38:50 +01:00
|
|
|
(prog1 (cond ((zerop to-find) t)
|
|
|
|
((< to-find count)
|
|
|
|
(message "Moved to the %d match which is last found"
|
|
|
|
(- count to-find))
|
|
|
|
t)
|
|
|
|
(t (message "Not found")
|
|
|
|
nil))
|
|
|
|
(sit-for 0.1)
|
|
|
|
(delete-overlay overlay))))
|
2013-04-01 01:09:32 +01:00
|
|
|
|
2013-03-29 16:12:20 +00:00
|
|
|
(defun vlfi-re-search-forward (regexp count)
|
2013-03-31 18:44:41 +01:00
|
|
|
"Search forward for REGEXP prefix COUNT number of times."
|
|
|
|
(interactive (list (read-regexp "Search whole file"
|
|
|
|
(if regexp-history
|
|
|
|
(car regexp-history))
|
|
|
|
'regexp-history)
|
|
|
|
(or current-prefix-arg 1)))
|
2013-04-01 01:09:32 +01:00
|
|
|
(vlfi-re-search regexp count nil))
|
2013-03-29 16:12:20 +00:00
|
|
|
|
|
|
|
(defun vlfi-re-search-backward (regexp count)
|
2013-03-31 18:44:41 +01:00
|
|
|
"Search backward for REGEXP prefix COUNT number of times."
|
2013-04-01 10:06:48 +01:00
|
|
|
(interactive (list (read-regexp "Search whole file backward"
|
2013-03-31 18:44:41 +01:00
|
|
|
(if regexp-history
|
|
|
|
(car regexp-history))
|
|
|
|
'regexp-history)
|
|
|
|
(or current-prefix-arg 1)))
|
2013-04-01 01:09:32 +01:00
|
|
|
(vlfi-re-search regexp count t))
|
2013-03-29 16:12:20 +00:00
|
|
|
|
2013-04-02 00:55:53 +01:00
|
|
|
;;; editing
|
|
|
|
(defvar vlfi-edit-mode-map
|
|
|
|
(let ((map (make-sparse-keymap)))
|
|
|
|
(set-keymap-parent map text-mode-map)
|
|
|
|
(define-key map "\C-c\C-c" 'vlfi-write)
|
|
|
|
(define-key map "\C-c\C-q" 'vlfi-discard-edit)
|
|
|
|
map)
|
|
|
|
"Keymap for `vlfi-edit-mode'.")
|
|
|
|
|
|
|
|
(define-minor-mode vlfi-edit-mode
|
|
|
|
"Major mode for editing large file chunks." nil "[edit]"
|
|
|
|
vlfi-edit-mode-map
|
|
|
|
(if (or (not arg) (and (numberp arg)
|
|
|
|
(< arg 0)))
|
|
|
|
(progn (setq buffer-read-only t)
|
|
|
|
(set-buffer-modified-p nil)
|
|
|
|
(buffer-disable-undo))
|
|
|
|
(setq buffer-read-only nil)
|
|
|
|
(buffer-enable-undo)
|
|
|
|
(message (substitute-command-keys
|
|
|
|
"Editing: Type \\[vlfi-write] to write chunk \
|
|
|
|
or \\[vlfi-discard-edit] to discard changes."))
|
|
|
|
(vlfi-print-vars)))
|
|
|
|
|
|
|
|
(defun vlfi-print-vars ()
|
|
|
|
(message "vlfi-start-pos: %s; vlfi-end-pos: %s; \
|
|
|
|
vlfi-batch-size: %s; vlfi-file-size: %s"
|
|
|
|
vlfi-start-pos vlfi-end-pos
|
|
|
|
vlfi-batch-size vlfi-file-size))
|
|
|
|
|
|
|
|
(defun vlfi-write ()
|
|
|
|
"Write current chunk to file. May overwrite existing content."
|
|
|
|
(interactive)
|
|
|
|
(when (or (= (buffer-size) (- vlfi-end-pos vlfi-start-pos))
|
|
|
|
(y-or-n-p "Changed size of original chunk. \
|
|
|
|
End of chunk will be garbled. Continue? "))
|
|
|
|
(write-region nil nil buffer-file-name vlfi-start-pos)
|
|
|
|
(vlfi-edit-mode -1)))
|
|
|
|
|
|
|
|
(defun vlfi-discard-edit ()
|
|
|
|
"Discard edit and refresh chunk from file."
|
|
|
|
(interactive)
|
|
|
|
(vlfi-edit-mode -1)
|
|
|
|
(message "Switched to VLFI mode."))
|
|
|
|
|
2013-02-02 14:12:30 +00:00
|
|
|
(provide 'vlfi)
|
2013-01-12 15:05:25 +00:00
|
|
|
|
2013-02-02 14:12:30 +00:00
|
|
|
;;; vlfi.el ends here
|