- (if (eq (get-char-property (point) 'face) 'match)
- (goto-char (previous-single-property-change (point) 'face)))
- (while (not (eq (get-char-property (point) 'face) 'match))
- (goto-char (or (previous-single-property-change (point) 'face)
- (point-max)))))
-
-(defun vlf-occur-show (&optional event)
- "Visit current `vlf-occur' link in a vlf buffer but stay in the \
-occur buffer. If original VLF buffer has been killed,
-open new VLF session each time.
-EVENT may hold details of the invocation."
- (interactive (list last-nonmenu-event))
- (let ((occur-buffer (if event
- (window-buffer (posn-window
- (event-end event)))
- (current-buffer))))
- (vlf-occur-visit event)
- (pop-to-buffer occur-buffer)))
-
-(defun vlf-occur-visit (&optional event)
- "Visit current `vlf-occur' link in a vlf buffer.
-If original VLF buffer has been killed,
-open new VLF session each time.
-EVENT may hold details of the invocation."
- (interactive (list last-nonmenu-event))
- (when event
- (set-buffer (window-buffer (posn-window (event-end event))))
- (goto-char (posn-point (event-end event))))
- (let* ((pos (point))
- (pos-relative (- pos (line-beginning-position) 1))
- (file (get-char-property pos 'file)))
- (if file
- (let ((chunk-start (get-char-property pos 'chunk-start))
- (chunk-end (get-char-property pos 'chunk-end))
- (buffer (get-char-property pos 'buffer))
- (match-pos (+ (get-char-property pos 'line-pos)
- pos-relative)))
- (or (buffer-live-p buffer)
- (let ((occur-buffer (current-buffer)))
- (setq buffer (vlf file))
- (switch-to-buffer occur-buffer)))
- (pop-to-buffer buffer)
- (if (buffer-modified-p)
- (cond ((and (= vlf-start-pos chunk-start)
- (= vlf-end-pos chunk-end))
- (goto-char match-pos))
- ((y-or-n-p "VLF buffer has been modified. \
-Really jump to new chunk? ")
- (vlf-move-to-chunk chunk-start chunk-end)
- (goto-char match-pos)))
- (vlf-move-to-chunk chunk-start chunk-end)
- (goto-char match-pos))))))
-
-(defun vlf-occur (regexp)
- "Make whole file occur style index for REGEXP.
-Prematurely ending indexing will still show what's found so far."
- (interactive (list (read-regexp "List lines matching regexp"
- (if regexp-history
- (car regexp-history)))))
- (let ((start-pos vlf-start-pos)
- (end-pos vlf-end-pos)
- (pos (point)))
- (vlf-beginning-of-file)
- (goto-char (point-min))
- (unwind-protect (vlf-build-occur regexp)
- (vlf-move-to-chunk start-pos end-pos)
- (goto-char pos))))
-
-(defun vlf-build-occur (regexp)
- "Build occur style index for REGEXP."
- (let ((line 1)
- (last-match-line 0)
- (last-line-pos (point-min))
- (file buffer-file-name)
- (total-matches 0)
- (match-end-pos (+ vlf-start-pos (position-bytes (point))))
- (occur-buffer (generate-new-buffer
- (concat "*VLF-occur " (file-name-nondirectory
- buffer-file-name)
- "*")))
- (line-regexp (concat "\\(?5:[\n\C-m]\\)\\|\\(?10:"
- regexp "\\)"))
- (batch-step (/ vlf-batch-size 8))
- (end-of-file nil)
- (reporter (make-progress-reporter
- (concat "Building index for " regexp "...")
- vlf-start-pos vlf-file-size)))
- (unwind-protect
- (progn
- (while (not end-of-file)
- (if (re-search-forward line-regexp nil t)
- (progn
- (setq match-end-pos (+ vlf-start-pos
- (position-bytes
- (match-end 0))))
- (if (match-string 5)
- (setq line (1+ line) ; line detected
- last-line-pos (point))
- (let* ((chunk-start vlf-start-pos)
- (chunk-end vlf-end-pos)
- (vlf-buffer (current-buffer))
- (line-pos (line-beginning-position))
- (line-text (buffer-substring
- line-pos (line-end-position))))
- (with-current-buffer occur-buffer
- (unless (= line last-match-line) ;new match line
- (insert "\n:") ; insert line number
- (let* ((overlay-pos (1- (point)))
- (overlay (make-overlay
- overlay-pos
- (1+ overlay-pos))))
- (overlay-put overlay 'before-string
- (propertize
- (number-to-string line)
- 'face 'shadow)))
- (insert (propertize line-text ; insert line
- 'file file
- 'buffer vlf-buffer
- 'chunk-start chunk-start
- 'chunk-end chunk-end
- 'mouse-face '(highlight)
- 'line-pos line-pos
- 'help-echo
- (format "Move to line %d"
- line))))
- (setq last-match-line line
- total-matches (1+ total-matches))
- (let ((line-start (1+
- (line-beginning-position)))
- (match-pos (match-beginning 10)))
- (add-text-properties ; mark match
- (+ line-start match-pos (- last-line-pos))
- (+ line-start (match-end 10)
- (- last-line-pos))
- (list 'face 'match
- 'help-echo
- (format "Move to match %d"
- total-matches))))))))
- (setq end-of-file (= vlf-end-pos vlf-file-size))
- (unless end-of-file
- (let ((batch-move (- vlf-end-pos batch-step)))
- (vlf-move-to-batch (if (< batch-move match-end-pos)
- match-end-pos
- batch-move) t))
- (goto-char (if (< vlf-start-pos match-end-pos)
- (or (byte-to-position (- match-end-pos
- vlf-start-pos))
- (point-min))
- (point-min)))
- (setq last-match-line 0
- last-line-pos (line-beginning-position))
- (progress-reporter-update reporter vlf-end-pos))))
- (progress-reporter-done reporter))
- (if (zerop total-matches)
- (progn (with-current-buffer occur-buffer
- (set-buffer-modified-p nil))
- (kill-buffer occur-buffer)
- (message "No matches for \"%s\"" regexp))
- (with-current-buffer occur-buffer
- (goto-char (point-min))
- (insert (propertize
- (format "%d matches from %d lines for \"%s\" \
-in file: %s" total-matches line regexp file)
- 'face 'underline))
- (set-buffer-modified-p nil)
- (forward-char 2)
- (vlf-occur-mode))
- (display-buffer occur-buffer)))))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;;; editing
-
-(defvar vlf-edit-mode-map
- (let ((map (make-sparse-keymap)))
- (set-keymap-parent map text-mode-map)
- (define-key map "\C-c\C-c" 'vlf-write)
- (define-key map "\C-c\C-q" 'vlf-discard-edit)
- (define-key map "\C-v" vlf-mode-map)
- map)
- "Keymap for command `vlf-edit-mode'.")
-
-(define-derived-mode vlf-edit-mode vlf-mode "VLF[edit]"
- "Major mode for editing large file chunks."
- (setq buffer-read-only nil)
- (buffer-enable-undo)
- (message (substitute-command-keys
- "Editing: Type \\[vlf-write] to write chunk \
-or \\[vlf-discard-edit] to discard changes.")))
-
-(defun vlf-discard-edit ()
- "Discard edit and refresh chunk from file."
- (interactive)
- (set-buffer-modified-p nil)
- (vlf-move-to-chunk vlf-start-pos vlf-end-pos)
- (vlf-mode)
- (message "Switched to VLF mode."))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;;; saving
-
-(defun vlf-write ()
- "Write current chunk to file. Always return true to disable save.
-If changing size of chunk, shift remaining file content."
- (interactive)
- (when (and (buffer-modified-p)
- (or (verify-visited-file-modtime (current-buffer))
- (y-or-n-p "File has changed since visited or saved. \
-Save anyway? ")))
- (let ((pos (point))
- (size-change (- vlf-encode-size
- (setq vlf-encode-size
- (length (encode-coding-region
- (point-min) (point-max)
- buffer-file-coding-system
- t))))))
- (cond ((zerop size-change)
- (write-region nil nil buffer-file-name vlf-start-pos t))
- ((< 0 size-change)
- (vlf-file-shift-back size-change))
- (t (vlf-file-shift-forward (- size-change))))
- (vlf-move-to-chunk vlf-start-pos vlf-end-pos)
- (goto-char pos))
- (vlf-mode))
- t)
-
-(defun vlf-file-shift-back (size-change)
- "Shift file contents SIZE-CHANGE bytes back."
- (write-region nil nil buffer-file-name vlf-start-pos t)
- (buffer-disable-undo)
- (let ((read-start-pos vlf-end-pos)
- (coding-system-for-write 'no-conversion)
- (reporter (make-progress-reporter "Adjusting file content..."
- vlf-end-pos
- vlf-file-size)))
- (while (vlf-shift-batch read-start-pos (- read-start-pos
- size-change))
- (setq read-start-pos (+ read-start-pos vlf-batch-size))
- (progress-reporter-update reporter read-start-pos))
- ;; pad end with space
- (erase-buffer)
- (vlf-verify-size)
- (insert-char 32 size-change)
- (write-region nil nil buffer-file-name (- vlf-file-size
- size-change) t)
- (progress-reporter-done reporter)))
-
-(defun vlf-shift-batch (read-pos write-pos)
- "Read `vlf-batch-size' bytes from READ-POS and write them \
-back at WRITE-POS. Return nil if EOF is reached, t otherwise."
- (erase-buffer)
- (vlf-verify-size)
- (let ((read-end (+ read-pos vlf-batch-size)))
- (insert-file-contents-literally buffer-file-name nil
- read-pos
- (min vlf-file-size read-end))
- (write-region nil nil buffer-file-name write-pos 0)
- (< read-end vlf-file-size)))
-
-(defun vlf-file-shift-forward (size-change)
- "Shift file contents SIZE-CHANGE bytes forward.
-Done by saving content up front and then writing previous batch."
- (buffer-disable-undo)
- (let ((size (+ vlf-batch-size size-change))
- (read-pos vlf-end-pos)
- (write-pos vlf-start-pos)
- (reporter (make-progress-reporter "Adjusting file content..."
- vlf-start-pos
- vlf-file-size)))
- (when (vlf-shift-batches size read-pos write-pos t)
- (setq write-pos (+ read-pos size-change)
- read-pos (+ read-pos size))
- (progress-reporter-update reporter write-pos)
- (let ((coding-system-for-write 'no-conversion))
- (while (vlf-shift-batches size read-pos write-pos nil)
- (setq write-pos (+ read-pos size-change)
- read-pos (+ read-pos size))
- (progress-reporter-update reporter write-pos))))
- (progress-reporter-done reporter)))
-
-(defun vlf-shift-batches (size read-pos write-pos hide-read)
- "Append SIZE bytes of file starting at READ-POS.
-Then write initial buffer content to file at WRITE-POS.
-If HIDE-READ is non nil, temporarily hide literal read content.
-Return nil if EOF is reached, t otherwise."
- (vlf-verify-size)
- (let ((read-more (< read-pos vlf-file-size))
- (start-write-pos (point-min))
- (end-write-pos (point-max)))
- (when read-more
- (goto-char end-write-pos)
- (insert-file-contents-literally buffer-file-name nil read-pos
- (min vlf-file-size (+ read-pos
- size))))
- ;; write
- (if hide-read ; hide literal region if user has to choose encoding
- (narrow-to-region start-write-pos end-write-pos))
- (write-region start-write-pos end-write-pos
- buffer-file-name write-pos 0)
- (delete-region start-write-pos end-write-pos)
- (if hide-read (widen))
- read-more))