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[ELPA-diffs] /srv/bzr/emacs/elpa r233: View Large Files from Mathias Dah
[ELPA-diffs] /srv/bzr/emacs/elpa r233: View Large Files from Mathias Dahl
Thu, 14 Jun 2012 16:32:31 -0400
committer: Sam Steingold <address@hidden>
branch nick: elpa
timestamp: Thu 2012-06-14 16:32:31 -0400
View Large Files from Mathias Dahl
=== added directory 'packages/vlf'
=== added file 'packages/vlf/vlf.el'
--- a/packages/vlf/vlf.el 1970-01-01 00:00:00 +0000
+++ b/packages/vlf/vlf.el 2012-06-14 20:32:31 +0000
@@ -0,0 +1,218 @@
+;;; vlf.el --- View Large Files
+;; Copyright (C) 2006 Mathias Dahl
+;; Version: 0.1.2
+;; Keywords: files, helpers, utilities
+;; Author: Mathias Dahl <address@hidden>
+;; Maintainer: Mathias Dahl
+;; URL: http://www.emacswiki.org/cgi-bin/wiki/VLF
+;; 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 2, 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.
+;; After reading the Nth post on Gnu Emacs Help about Viewing Large
+;; Files in Emacs, it itched so much that I decided to make a try. It
+;; helped quite a lot when Kevin Rodgers posted a snippet on how to
+;; use `insert-file-contents' to extract part of a file. At first I
+;; made a try using head and tail and that worked too, but using
+;; internal Emacs commands is nicer. Here is the code to extract data
+;; using head and tail in case someone wanna try that out in the
+;; (defun vlf-extract-part-of-file (file from to)
+;; "Returns bytes in FILE from FROM to TO."
+;; (let ((size (vlf-file-size file)))
+;; (if (or (> from size)
+;; (> to size))
+;; (error "From or to is larger that the file size"))
+;; (format "head --bytes %d %s | tail --bytes %d"
+;; to file (+ (- to from) 1)) t)
+;; (buffer-substring (point-min) (point-max)))))
+;; - Wed Jan 10 00:13:45 2007
+;; First version created and released into the wild.
+;; - Wed Jan 10 18:58:47 2007
+;; Added option to use external tools (head and tail) for
+;; extracting the data from the file.
+;; Refactored buffer name format code into a new function.
+;; Started to fiddle with float/integer conversions.
+;; Probably some. Feel free to fix them :)
+(defgroup vlf nil
+ "Browse large files in Emacs"
+ :prefix "vlf-"
+ :group 'files)
+(defcustom vlf-batch-size 1000
+ "Defines how large each batch of file data is."
+ :type 'integer
+ :group 'vlf)
+(defcustom vlf-external-extraction nil
+ "How to extract the data from a file.
+`nil' means to use internal extraction, using
+`insert-file-contents'. `t' means to use external `head' and
+ :type 'boolean
+ :group 'vlf)
+(defvar vlf-current-start-pos 1
+ "Keeps track of file position.")
+(defvar vlf-current-batch-size nil
+ "Keeps track of current batch size.")
+(defvar vlf-current-file nil
+ "File that is currently viewed.")
+(defvar vlf-current-file-size 0
+ "Size of current file.")
+(defvar vlf-mode-map (make-sparse-keymap)
+ "Keymap for `vlf-mode'.")
+(defun vlf-define-keymap ()
+ "Define keymap for `vlf-mode'."
+ (define-key vlf-mode-map [next] 'vlf-next)
+ (define-key vlf-mode-map [prior] 'vlf-prev)
+ (define-key vlf-mode-map "q" 'vlf-quit))
+ fundamental-mode "vlf-mode"
+ "Mode to browse large files in.
+See `vlf' for details."
+ (toggle-read-only 1)
+ (message "vlf-mode enabled"))
+(defun vlf-file-size (file)
+ "Get size of FILE."
+ (nth 7 (file-attributes file)))
+(defun vlf-quit ()
+ "Quit vlf."
+ (kill-buffer (current-buffer)))
+(defun vlf-extract-with-head-and-tail (file from to)
+ "Returns bytes in FILE from FROM to TO."
+ (let ((size (vlf-file-size file)))
+ (if (or (> from size)
+ (> to size))
+ (error "From or to is larger that the file size"))
+ (format "head --bytes %.0f \"%s\" | tail --bytes %.0f"
+ (float to) (expand-file-name file)
+ (float (+ (- to from) 1))) t)
+ (buffer-substring (point-min) (point-max)))))
+(defun vlf-insert-batch ()
+ "Insert current batch of data."
+ (let* ((beg (1- vlf-current-start-pos))
+ (end (+ beg vlf-current-batch-size)))
+ (if vlf-external-extraction
+ vlf-current-file (1+ beg) end))
+ vlf-current-file nil
+ (floor beg) (floor end)))))
+(defun vlf-format-buffer-name ()
+ "Return format for vlf buffer name."
+ (format "%s[%.0f,%.0f(%.0f)]"
+ (file-name-nondirectory vlf-current-file)
+ (1- (+ vlf-current-start-pos
+(defun vlf-next ()
+ "Display the next batch of file data."
+ (let ((inhibit-read-only t)
+ left next-start-pos
+ (size (vlf-file-size vlf-current-file)))
+ (setq next-start-pos (float (+ vlf-current-start-pos
+ (if (> next-start-pos size)
+ (message "End of file")
+ (setq vlf-current-batch-size
+ vlf-current-start-pos next-start-pos
+ left (1+ (- size vlf-current-start-pos)))
+ (if (< left vlf-current-batch-size)
+ (setq vlf-current-batch-size left))
+(defun vlf-prev ()
+ "Display the previous batch of file data."
+ (if (= 1 vlf-current-start-pos)
+ (message "At beginning of file")
+ (let ((inhibit-read-only t))
+ (setq vlf-current-start-pos (- vlf-current-start-pos
+ vlf-current-batch-size vlf-batch-size)
+(defun vlf (file)
+ "View a large file in Emacs 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 amount of bytes to
+display by customizing `vlf-batch-size'."
+ (interactive "fFile to open: ")
+ (setq vlf-current-file file
+ vlf-current-start-pos 1
+ vlf-current-file-size (vlf-file-size file)
+ (1- (+ vlf-current-start-pos
+ (generate-new-buffer (vlf-format-buffer-name)))
+;;; vlf.el ends here
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