From: Junio C Hamano <gitster@pobox.com>
Date: Thu, 20 Feb 2020 17:49:17 GMT
Subject: Re: [GSoC PATCH v2 1/2] lib-log-graph: consolidate test_cmp_graph logic
Message-ID: <xmqqsgj5b142.fsf@gitster-ct.c.googlers.com>
In-Reply-To: <20200220091528.28472-2-abhishekkumar8222@gmail.com>

Abhishek Kumar <abhishekkumar8222@gmail.com> writes:

> Logic for comparing log graphs is duplicated across test scripts.
>
> This patch consolidates such logic into lib-log-graph.

The proposed log message is a bit thin.  It does a bit more than
"conslidates", doesn't it?

> Signed-off-by: Abhishek Kumar <abhishekkumar8222@gmail.com>
> ---
>  t/lib-log-graph.sh           | 22 +++++++++++++++
>  t/t3430-rebase-merges.sh     |  5 ++--
>  t/t4202-log.sh               | 53 ++++++++++--------------------------
>  t/t4214-log-graph-octopus.sh | 46 ++++++++++---------------------
>  t/t4215-log-skewed-merges.sh |  5 ++--
>  5 files changed, 54 insertions(+), 77 deletions(-)
>  create mode 100755 t/lib-log-graph.sh
>
> diff --git a/t/lib-log-graph.sh b/t/lib-log-graph.sh
> new file mode 100755
> index 0000000000..97cde44dc7
> --- /dev/null
> +++ b/t/lib-log-graph.sh
> @@ -0,0 +1,22 @@
> +# Helps shared by the test scripts for comparing log graphs.
> +
> +sanitize_log_output () {
> +	sed -e 's/ *$//' \
> +	    -e 's/commit [0-9a-f]*$/commit COMMIT_OBJECT_NAME/' \
> +	    -e 's/Merge: [ 0-9a-f]*$/Merge: MERGE_PARENTS/' \
> +	    -e 's/Merge tag.*/Merge HEADS DESCRIPTION/' \
> +	    -e 's/Merge commit.*/Merge HEADS DESCRIPTION/' \
> +	    -e 's/index [0-9a-f]*\.\.[0-9a-f]*/index BEFORE..AFTER/'
> +}

For example, discarding the singular/plural compat stuff from the
t4202's version is OK, but we should record that is what we did in
the log message to allow readers to notice.

> +lib_test_cmp_graph () {

Nicely named.

> +	git log --graph "$@" >output &&
> +	sed 's/ *$//' >output.sanitized < output &&

Lose SP not just on the output redirection but also on the input
redirection.  I.e.

	sed 's/ *$//' >output.sanitized <output &&

Or you can lose the input redirection altogether as "sed" knows to
treat remaining command line arguments as names of its input files,
i.e.

	sed 's/ *$//' output >output.sanitized &&

People may find the latter easier to read.  I personally do not have
strong preference either way as long as it is consistent.

> +	test_i18ncmp expect output.sanitized
> +}
> +
> +lib_test_cmp_short_graph () {
> +	git log --graph --pretty=short "$@" >output &&
> +	sanitize_log_output >output.sanitized < output &&

	sanitize_log_output <output >output.sanitized &&

(I won't repeat)


>  check_graph () {
>  	cat >expect &&
> -	git log --graph --pretty=tformat:%s "$@" >actual.raw &&
> -	sed "s/ *$//" actual.raw >actual &&
> -	test_cmp expect actual
> +	lib_test_cmp_graph --format=%s "$@"
>  }

Hmm, is this correct?  The input goes to expect but the new helper
you wrote, lib_test_cmp_graph, won't see it.