diff tests/test-grep.out @ 8849:80cc4b1a62d0

compare grep result between target and its parent

I found that typical case is that grep target is added at (*) revision
in the tree shown below.

     +--- 1(*) --- 3
     0
     +--- 2 ------ 4

Now, I expect 'hg grep --all' to show only rev:1 which is first
appearance of target line.

But 'hg grep --all' will tell:

  target line dis-appeared at 3 => 4
  target line     appeared at 2 => 3
  target line dis-appeared at 1 => 2
  target line     appeared at 0 => 1

because current 'hg grep' implementation compares not between target
revision and its parent, but between neighbor revisions in walkthrough
order.

I checked performance of this patch by "hg grep --follow --all
walkchangerevs" on whole Mercurial repo, and patched version could
complete as fast as un-patched one.

--- a/tests/test-grep.out	Sat Jun 20 17:09:49 2009 +0200
+++ b/tests/test-grep.out	Tue May 19 16:49:54 2009 +0900
@@ -38,6 +38,13 @@
 noeol:4:no infinite loo
 % issue 685
 adding color
+colour:1:octarine
 color:0:octarine
 colour:1:octarine
-colour:1:octarine
+% issue 337
+adding color
+1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+created new head
+1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+color:3:-:red
+color:1:+:red