[PATCH 1 of 2] test-grep: document that trivially moved lines might not be detected

[Augie Fackler]

queued, thanks

> On Sep 9, 2020, at 08:20, Yuya Nishihara <yuya at tcha.org> wrote:
> 
> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1599568690 -32400
> #      Tue Sep 08 21:38:10 2020 +0900
> # Node ID cc233fb2375feef75d3f9619ed69cd5d5dea89dd
> # Parent  89d2c8f8bb4f5bfda272d2665ebcacd98e273d25
> test-grep: document that trivially moved lines might not be detected
> 
> I'm not going to fix this. I just learned "grep --diff" does clever thing
> than a simple grep(patch.diff(context=0)), and I think it's better to
> document how things work.
> 
> diff --git a/tests/test-grep.t b/tests/test-grep.t
> --- a/tests/test-grep.t
> +++ b/tests/test-grep.t
> @@ -640,6 +640,49 @@ revisions printed, just their order.
> 
>   $ cd ..
> 
> +Moved line may not be collected by "grep --diff" since it first filters
> +the contents to be diffed by the pattern. (i.e.
> +"diff <(grep pat a) <(grep pat b)", not "diff a b | grep pat".)
> +This is much faster than generating full diff per revision.
> +
> +  $ hg init moved-line
> +  $ cd moved-line
> +  $ cat <<'EOF' > a
> +  > foo
> +  > bar
> +  > baz
> +  > EOF
> +  $ hg ci -Am initial
> +  adding a
> +  $ cat <<'EOF' > a
> +  > bar
> +  > baz
> +  > foo
> +  > EOF
> +  $ hg ci -m reorder
> +
> +  $ hg diff -c 1
> +  diff -r a593cc55e81b -r 69789a3b6e80 a
> +  --- a/a	Thu Jan 01 00:00:00 1970 +0000
> +  +++ b/a	Thu Jan 01 00:00:00 1970 +0000
> +  @@ -1,3 +1,3 @@
> +  -foo
> +   bar
> +   baz
> +  +foo
> +
> + can't find the move of "foo" at the revision 1:
> +
> +  $ hg grep --diff foo -r1
> +  [1]
> +
> + "bar" isn't moved at the revisoin 1:
> +
> +  $ hg grep --diff bar -r1
> +  [1]
> +
> +  $ cd ..
> +
> Test for showing working of allfiles flag
> 
>   $ hg init sng
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