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Adjust chunk borders to minimize shift differences and optimize

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detection of identical batches when ediff-ing.
This commit is contained in:
Andrey Kotlarski 2014-01-17 02:55:21 +02:00
parent 27e3bbb320
commit 9646b00215
2 changed files with 99 additions and 26 deletions
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10
vlf-base.el
View File

@ -147,9 +147,9 @@ bytes added to the end."
(let ((pos (+ (position-bytes (point)) vlf-start-pos))
(inhibit-read-only t))
(cond ((< end edit-end)
(let* ((del-pos (1+ (or (byte-to-position
(- end vlf-start-pos))
0)))
(let* ((del-pos (or (byte-to-position
(1+ (- end vlf-start-pos)))
(point-min)))
(del-len (length (encode-coding-region
del-pos (point-max)
buffer-file-coding-system
@ -167,8 +167,8 @@ bytes added to the end."
(/= start vlf-end-pos) t
(point-max)))))))
(cond ((< vlf-start-pos start)
(let* ((del-pos (1+ (byte-to-position
(- start vlf-start-pos))))
(let* ((del-pos (byte-to-position
(- start vlf-start-pos)))
(del-len (length (encode-coding-region
(point-min) del-pos
buffer-file-coding-system

115
vlf-ediff.el
View File

@ -62,8 +62,9 @@ respectively of difference list, runs ediff over the adjacent chunks."
(vlf-ediff-next buffer-A buffer-B 'vlf-next-chunk)
(ediff-buffers buffer-A buffer-B
'((lambda () (setq vlf-ediff-session t)
(if (< 0 ediff-number-of-differences)
(ediff-jump-to-difference 1))))))
(when (< 0 ediff-number-of-differences)
(vlf-ediff-adjust buffer-A buffer-B t)
(ediff-jump-to-difference 1))))))
;;;###autoload
(defun vlf-ediff-files (file-A file-B batch-size)
@ -102,13 +103,11 @@ respectively of difference list, runs ediff over the adjacent chunks."
(defun vlf-next-chunk ()
"Move to next chunk."
(let ((new-start (+ vlf-start-pos vlf-batch-size)))
(vlf-move-to-chunk new-start (+ new-start vlf-batch-size) t)))
(vlf-move-to-chunk vlf-end-pos (+ vlf-end-pos vlf-batch-size) t))
(defun vlf-prev-chunk ()
"Move to previous chunk."
(let ((new-start (- vlf-start-pos vlf-batch-size)))
(vlf-move-to-chunk new-start (+ new-start vlf-batch-size) t)))
(vlf-move-to-chunk (- vlf-start-pos vlf-batch-size) vlf-start-pos t))
(defun vlf-ediff-next (buffer-A buffer-B &optional next-func)
"Find next pair of chunks that differ in BUFFER-A and BUFFER-B.
@ -117,38 +116,37 @@ no difference at the current ones."
(set-buffer buffer-A)
(setq buffer-A (current-buffer)) ;names change, so reference by buffer object
(let ((end-A (= vlf-start-pos vlf-end-pos))
(content (buffer-substring-no-properties (point-min)
(point-max)))
(point-max-A (point-max))
(min-file-size vlf-file-size)
(is-forward (eq next-func 'vlf-next-chunk)))
(forward-p (eq next-func 'vlf-next-chunk)))
(set-buffer buffer-B)
(setq buffer-B (current-buffer)
min-file-size (min min-file-size vlf-file-size))
(let ((end-B (= vlf-start-pos vlf-end-pos))
(reporter (make-progress-reporter
"Searching for difference..."
(if is-forward vlf-start-pos
(if forward-p vlf-start-pos
(- min-file-size vlf-end-pos))
min-file-size)))
(while (and (or (not end-A) (not end-B))
(equal content (buffer-substring-no-properties
(point-min) (point-max))))
(zerop (compare-buffer-substrings
buffer-A (point-min) point-max-A
buffer-B (point-min) (point-max))))
(funcall next-func)
(setq end-B (= vlf-start-pos vlf-end-pos))
(with-current-buffer buffer-A
(funcall next-func)
(setq content (buffer-substring-no-properties (point-min)
(point-max))
end-A (= vlf-start-pos vlf-end-pos)))
(setq end-A (= vlf-start-pos vlf-end-pos)
point-max-A (point-max)))
(progress-reporter-update reporter
(if is-forward vlf-end-pos
(if forward-p vlf-end-pos
(- vlf-file-size vlf-start-pos))))
(progress-reporter-done reporter)
(cond ((or (not end-A) (not end-B))
(vlf-update-buffer-name)
(set-buffer buffer-A)
(vlf-update-buffer-name))
(is-forward ;end of both files
(forward-p ;end of both files
(let ((max-file-size vlf-file-size))
(with-current-buffer buffer-A
(setq max-file-size (max max-file-size vlf-file-size))
@ -176,8 +174,10 @@ of difference list."
(vlf-next-chunk)
(vlf-ediff-next buffer-A buffer-B 'vlf-next-chunk))
(ediff-update-diffs)
(if (< 0 ediff-number-of-differences)
(ediff-jump-to-difference 1)))
(when (< 0 ediff-number-of-differences)
(vlf-ediff-adjust buffer-A buffer-B t)
(vlf-ediff-adjust buffer-A buffer-B)
(ediff-jump-to-difference 1)))
ad-do-it))
(defadvice ediff-previous-difference (around vlf-ediff-prev-difference
@ -195,10 +195,83 @@ beginning of difference list."
(vlf-prev-chunk)
(vlf-ediff-next buffer-A buffer-B 'vlf-prev-chunk))
(ediff-update-diffs)
(if (< 0 ediff-number-of-differences)
(ediff-jump-to-difference -1)))
(when (< 0 ediff-number-of-differences)
(vlf-ediff-adjust buffer-A buffer-B)
(vlf-ediff-adjust buffer-A buffer-B t)
(ediff-jump-to-difference -1)))
ad-do-it))
(defun vlf-ediff-adjust (buf-A buf-B &optional end)
"Additionally adjust buffer borders for BUF-A and BUF-B.
Adjust beginning if END is nil."
(let* ((diff-num (if end (1- ediff-number-of-differences) 0))
(diff-A (ediff-get-diff-overlay diff-num 'A))
(diff-B (ediff-get-diff-overlay diff-num 'B))
diff-A-str diff-B-str adjust-p)
(save-excursion
(set-buffer buf-A)
(setq adjust-p (if end (= (overlay-end diff-A) (point-max))
(= (overlay-start diff-A) (point-min)))
diff-A-str (and adjust-p (buffer-substring-no-properties
(overlay-start diff-A)
(overlay-end diff-A))))
(set-buffer buf-B)
(setq adjust-p (and adjust-p
(if end (= (overlay-end diff-B) (point-max))
(= (overlay-start diff-B) (point-min))))
diff-B-str (and adjust-p (buffer-substring-no-properties
(overlay-start diff-B)
(overlay-end diff-B))))
(if adjust-p
(let ((len-A (length diff-A-str))
(len-B (length diff-B-str))
(adjust-func (if end 'vlf-ediff-adjust-end-1
'vlf-ediff-adjust-start-1)))
(cond
((< len-A len-B)
(or (funcall adjust-func diff-A-str diff-B-str buf-B)
(setq adjust-p nil)))
((< len-B len-A)
(or (funcall adjust-func diff-B-str diff-A-str buf-A)
(setq adjust-p nil)))
(t (setq adjust-p nil))))))
(if adjust-p (ediff-update-diffs))))
(defun vlf-ediff-adjust-start-1 (diff-short diff-long vlf-buffer)
"Remove difference between DIFF-SHORT and DIFF-LONG from beginning\
of VLF-BUFFER."
(when (string-suffix-p diff-short diff-long)
(set-buffer vlf-buffer)
(vlf-move-to-chunk (+ vlf-start-pos
(length (encode-coding-string
(substring diff-long 0
(- (length diff-long)
(length diff-short)))
buffer-file-coding-system t)))
vlf-end-pos)))
(defun vlf-ediff-adjust-end-1 (diff-short diff-long vlf-buffer)
"Remove difference between DIFF-SHORT and DIFF-LONG from the end of\
VLF-BUFFER."
(when (string-prefix-p diff-short diff-long)
(set-buffer vlf-buffer)
(vlf-move-to-chunk vlf-start-pos
(- vlf-end-pos
(length (encode-coding-string
(substring diff-long
(length diff-short))
buffer-file-coding-system t))))))
(unless (fboundp 'string-suffix-p)
(defun string-suffix-p (suffix string &optional ignore-case)
"Return non-nil if SUFFIX is a suffix of STRING.
If IGNORE-CASE is non-nil, the comparison is done without paying
attention to case differences."
(let ((start-pos (- (length string) (length suffix))))
(and (>= start-pos 0)
(eq t (compare-strings suffix nil nil string start-pos nil
ignore-case))))))
(provide 'vlf-ediff)
;;; vlf-ediff.el ends here