From: Tino Calancha <tino.calancha@gmail.com>
To: 25410@debbugs.gnu.org
Subject: bug#25410: 26.0.50; Refine an unified diff hunk only if adds lines
Date: Tue, 10 Jan 2017 19:08:20 +0900 [thread overview]
Message-ID: <8737grz0q3.fsf@gmail.com> (raw)
After deletion of a large file from CVS, a diff shows
a very large hunk with just deleted lines. Then, for unified diffs, a call
to `diff-refine-hunk' on that hunk takes a huge time.
Instead, it's better to first check if the hunk adds new lines: only when
this is true, then proceed with the hunk refinement.
emacs -Q
M-! git diff ef8c9f8^ ef8c9f8 RET
C-x o
M-x diff-mode RET
C-c C-b
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
From b3252092f8fdfc03c02d23022d901a625d183d89 Mon Sep 17 00:00:00 2001
From: Tino Calancha <tino.calancha@gmail.com>
Date: Tue, 10 Jan 2017 18:46:00 +0900
Subject: [PATCH] Refine an unified diff hunk only if adds lines
* lisp/vc/diff-mode.el (diff-refine-hunk): Refine the hunk
only when adds some new lines (Bug#25410).
---
lisp/vc/diff-mode.el | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/lisp/vc/diff-mode.el b/lisp/vc/diff-mode.el
index 9dfcd944bb..e045a5d974 100644
--- a/lisp/vc/diff-mode.el
+++ b/lisp/vc/diff-mode.el
@@ -2075,22 +2075,23 @@ diff-refine-hunk
(props-c '((diff-mode . fine) (face diff-refine-changed)))
(props-r '((diff-mode . fine) (face diff-refine-removed)))
(props-a '((diff-mode . fine) (face diff-refine-added))))
-
(remove-overlays beg end 'diff-mode 'fine)
-
(goto-char beg)
(pcase style
(`unified
- (while (re-search-forward
- (eval-when-compile
- (let ((no-LF-at-eol-re "\\(?:\\\\.*\n\\)?"))
- (concat "^\\(?:-.*\n\\)+" no-LF-at-eol-re
- "\\(\\)"
- "\\(?:\\+.*\n\\)+" no-LF-at-eol-re)))
- end t)
- (smerge-refine-subst (match-beginning 0) (match-end 1)
- (match-end 1) (match-end 0)
- nil 'diff-refine-preproc props-r props-a)))
+ ;; Refine hunk only when it adds lines (Bug#25410).
+ (when (re-search-forward "^\\(?:\\+.*\n\\)+" end t)
+ (goto-char beg)
+ (while (re-search-forward
+ (eval-when-compile
+ (let ((no-LF-at-eol-re "\\(?:\\\\.*\n\\)?"))
+ (concat "^\\(?:-.*\n\\)+" no-LF-at-eol-re
+ "\\(\\)"
+ "\\(?:\\+.*\n\\)+" no-LF-at-eol-re)))
+ end t)
+ (smerge-refine-subst (match-beginning 0) (match-end 1)
+ (match-end 1) (match-end 0)
+ nil 'diff-refine-preproc props-r props-a))))
(`context
(let* ((middle (save-excursion (re-search-forward "^---")))
(other middle))
--
2.11.0
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
In GNU Emacs 26.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.5)
of 2017-01-09
Repository revision: ef8c9f8fc922b615aca91b47820d1f1900fddc96
next reply other threads:[~2017-01-10 10:08 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-10 10:08 Tino Calancha [this message]
2017-01-10 14:22 ` bug#25410: 26.0.50; Refine an unified diff hunk only if adds lines npostavs
2017-01-10 15:07 ` Tino Calancha
2017-01-11 2:49 ` Tino Calancha
2017-01-11 8:13 ` Tino Calancha
[not found] ` <87wpe0zz0s.fsf@users.sourceforge.net>
2017-01-12 5:32 ` Tino Calancha
2017-01-13 4:50 ` npostavs
2017-01-13 6:14 ` Tino Calancha
2017-01-13 12:11 ` Tino Calancha
2017-01-13 16:31 ` Noam Postavsky
2017-01-14 5:38 ` Tino Calancha
2017-01-19 1:55 ` npostavs
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