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Add vlf as an option when opening large files.

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Andrey Kotlarski 2013-01-12 18:12:45 +02:00
parent 2d0709beca
commit 2edbb6b3c7
2 changed files with 49 additions and 14 deletions
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10
README.org
View File

@ -2,3 +2,13 @@
An Emacs mode that allows viewing files in chunks. This is a fork
that builds on the GNU ELPA vlf.el.
* Usage tips
When opening file, by default Emacs checks its size against
`large-file-warning-threshold' and if larger asks for confirmation.
To add vlf as an option in these cases:
#+BEGIN_SRC emacs-lisp
(fset 'abort-if-file-too-large 'vlf-if-file-too-large)
#+END_SRC

53
vlf.el
View File

@ -1,6 +1,6 @@
;;; vlf.el --- View Large Files
;; Copyright (C) 2006, 2012 Free Software Foundation, Inc.
;; Copyright (C) 2006, 2012, 2013 Free Software Foundation, Inc.
;; Version: 0.3
;; Keywords: large files, utilities
@ -57,8 +57,8 @@
(let ((map (make-sparse-keymap)))
(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--")
(define-key map (kbd "M-+") 'vlf-change-batch-size)
(define-key map (kbd "M--")
(lambda () "Decrease vlf batch size by factor of 2."
(interactive)
(vlf-change-batch-size t)))
@ -174,7 +174,7 @@ You can customize the number of bytes to
(insert-file-contents buffer-file-name nil
vlf-start-pos vlf-end-pos)
(vlf-mode)
(display-buffer (current-buffer))))
(switch-to-buffer (current-buffer))))
(defun dired-vlf (from-end)
"In Dired, visit the file on this line in VLF mode.
@ -185,28 +185,53 @@ With FROM-END prefix, view from the back."
(eval-after-load "dired"
'(define-key dired-mode-map "V" 'dired-vlf))
;;; use this to hijack `abort-if-file-too-large'
;;;###autoload
(defun vlf-if-file-too-large (size op-type filename)
"If file SIZE larger than `large-file-warning-threshold', \
allow user to view file with `vlf', open it normally or abort.
OP-TYPE specifies the file operation being performed over FILENAME."
(when (and large-file-warning-threshold size
(> size large-file-warning-threshold))
(let ((char nil))
(while (not (memq (setq char
(read-event
(propertize
(format "File %s is large (%s): %s normally (o), %s with vlf (v) or abort (a)"
(file-name-nondirectory filename)
(file-size-human-readable size)
op-type op-type)
'face 'minibuffer-prompt)))
'(?o ?O ?v ?V ?a ?A))))
(cond ((memq char '(?o ?O)))
((memq char '(?v ?V))
(vlf nil filename)
(error ""))
((memq char '(?a ?A))
(error "Aborted"))))))
;;;; ChangeLog:
;; 2012-11-29 Sam Steingold <sds@gnu.org>
;;
;;
;; hook into dired
;;
;;
;; 2012-06-17 Chong Yidong <cyd@gnu.org>
;;
;;
;; vlf.el: Improve commentary.
;;
;;
;; 2012-06-15 Sam Steingold <sds@gnu.org>
;;
;;
;; fix vlf-change-batch-size binding
;;
;;
;; 2012-06-14 Sam Steingold <sds@gnu.org>
;;
;;
;; complete rewrite by Sam Steingold
;;
;;
;; 2012-06-14 Sam Steingold <sds@gnu.org>
;;
;;
;; View Large Files from Mathias Dahl
;;
;;
(provide 'vlf)