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Optimize vlf-goto-line not to decode batches as long as possible.

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This commit is contained in:
Andrey Kotlarski 2014-01-22 02:42:52 +02:00
parent 0fa8e8d6bf
commit 5c604c48a4
1 changed files with 41 additions and 10 deletions
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51
vlf-search.el
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@ -175,22 +175,53 @@ Search is performed chunk by chunk in `vlf-batch-size' memory."
"Go to line N. If N is negative, count from the end of file."
(interactive (if (vlf-no-modifications)
(list (read-number "Go to line: "))))
(vlf-verify-size)
(let ((start-pos vlf-start-pos)
(end-pos vlf-end-pos)
(pos (point))
(success nil))
(unwind-protect
(if (< 0 n)
(progn (vlf-beginning-of-file)
(goto-char (point-min))
(setq success (vlf-re-search "[\n\C-m]" (1- n)
nil 0)))
(vlf-end-of-file)
(goto-char (point-max))
(setq success (vlf-re-search "[\n\C-m]" (- n) t 0)))
(if success
(message "Onto line %s" n)
(vlf-move-to-chunk start-pos end-pos)
(let ((start 0)
(end (min vlf-batch-size vlf-file-size))
(inhibit-read-only t))
(setq n (1- n))
(vlf-with-undo-disabled
(while (and (< (- end start) n)
(< n (- vlf-file-size start)))
(erase-buffer)
(insert-file-contents-literally buffer-file-name
nil start end)
(goto-char (point-min))
(while (re-search-forward "[\n\C-m]" nil t)
(setq n (1- n)))
(vlf-verify-size)
(setq start end
end (min vlf-file-size
(+ start vlf-batch-size))))
(when (< n (- vlf-file-size end))
(vlf-move-to-chunk-2 start end)
(goto-char (point-min))
(setq success (vlf-re-search "[\n\C-m]" n nil 0)))))
(let ((start (max 0 (- vlf-file-size vlf-batch-size)))
(end vlf-file-size)
(inhibit-read-only t))
(vlf-with-undo-disabled
(while (and (< (- end) n) (< n (- start end)))
(erase-buffer)
(insert-file-contents-literally buffer-file-name nil
start end)
(goto-char (point-max))
(while (re-search-backward "[\n\C-m]" nil t)
(setq n (1+ n)))
(setq end start
start (max 0 (- end vlf-batch-size))))
(when (< (- end) n)
(vlf-move-to-chunk-2 start end)
(goto-char (point-max))
(setq success (vlf-re-search "[\n\C-m]" (- n) t 0))))))
(unless success
(vlf-move-to-chunk-2 start-pos end-pos)
(goto-char pos)))))
(provide 'vlf-search)