Re: [PATCH v3 1/5] t3701: redefine what is "bogus" output of a diff filter

[Phillip Wood <phillip.wood123@gmail.com>]

Hi Dscho

On 29/08/2022 16:11, Johannes Schindelin via GitGitGadget wrote:
> From: Johannes Schindelin <johannes.schindelin@gmx.de>
> 
> When parsing the colored version of a diff, the interactive `add`
> command really relies on the colored version having the same number of
> lines as the non-colored version. That is an invariant.
> 
> However, in the 'detect bogus diffFilter output' test case in t3701, we
> essentially required a hunk header that contains parseable `@@ ... @@`
> hunk headers, and called all colored diffs without such hunks bogus.
> 
> The reason for this is that we would like to show the users the adjusted
> hunk headers _including_ the extra part after the `@@ ... @@`
> information, which usually contains things like the function name or
> soms such.
> 
> Now, there is a _very_ popular diff colorizer called `diff-so-fancy`
> that does not produce such colored diffs as the built-in `add` command
> expects. Nevertheless, the Perl variant of the `add` command handles
> those nicely, essentially by ignoring the hunk header and saying "there
> is nothing else we can show except the original hunk header, even if we
> had to adjust the line range and the original hunk header might get that
> wrong".
> 
> In preparation for teaching the built-in interactive `add` to be a bit
> more lenient, let's change the 'detect bogus diffFilter output' test
> case so that it verifies that a mismatched number of lines causes the
> command to error out, but not an unparseable hunk header.

The existing test deletes the first line of the diff[1] - so it is 
removing the "diff --git ..." header not the hunk header. This patch 
changes the filter to delete everything except the diff header which 
seems like a less realistic test.

Best Wishes

Phillip

[1] To verify this I changed the filter to  "sed 1d | tee 
filtered-diff". filtered diff-contains
index 0889435..d95f3ad 100644

--- a/test

+++ b/test

@@ -1,6 +1 @@

-10

-20

-30

-40

-50

-60

+content



> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
>   t/t3701-add-interactive.sh | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
> index 3b7df9bed5a..88d8133f38f 100755
> --- a/t/t3701-add-interactive.sh
> +++ b/t/t3701-add-interactive.sh
> @@ -761,7 +761,7 @@ test_expect_success 'detect bogus diffFilter output' '
>   	git reset --hard &&
>   
>   	echo content >test &&
> -	test_config interactive.diffFilter "sed 1d" &&
> +	test_config interactive.diffFilter "sed q" &&
>   	printf y >y &&
>   	force_color test_must_fail git add -p <y
>   '