Re: [PATCH] shortlog: pass the mailmap into the revision walker

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

On Wed, Dec 12 2018, CB Bailey wrote:

> From: CB Bailey <cbailey32@bloomberg.net>
>
> shortlog always respects the mailmap in its output. Pass the mailmap
> into the revision walker to allow the mailmap to be used with revision
> limiting options such as '--author'.
>
> This removes some apparently inconsistent behaviors when using
> '--author', such as not finding some or all commits for a given author
> which do appear under that author in an unrestricted invocation of
> shortlog or commits being summarized under a different author than the
> specified author.
>
> Signed-off-by: CB Bailey <cbailey32@bloomberg.net>
> ---
>
> Resending with omitted s-o-b.
>
>  builtin/shortlog.c |  2 ++
>  t/t4203-mailmap.sh | 28 ++++++++++++++++++++++++++++
>  2 files changed, 30 insertions(+)
>
> diff --git a/builtin/shortlog.c b/builtin/shortlog.c
> index 88f88e97b2..a6fb00ade8 100644
> --- a/builtin/shortlog.c
> +++ b/builtin/shortlog.c
> @@ -188,6 +188,8 @@ static void get_from_rev(struct rev_info *rev, struct shortlog *log)
>  {
>  	struct commit *commit;
>
> +	rev->mailmap = &log->mailmap;
> +
>  	if (prepare_revision_walk(rev))
>  		die(_("revision walk setup failed"));
>  	while ((commit = get_revision(rev)) != NULL)
> diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
> index 43b1522ea2..9bee35b06c 100755
> --- a/t/t4203-mailmap.sh
> +++ b/t/t4203-mailmap.sh
> @@ -383,6 +383,34 @@ test_expect_success 'Shortlog output (complex mapping)' '
>
>  '
>
> +test_expect_success 'Shortlog output (complex mapping, filtered)' '
> +
> +	printf "     1\tA U Thor <author@example.com>\n" >expect &&
> +
> +	git shortlog -es --author="A U Thor" HEAD >actual &&
> +	test_cmp expect actual &&
> +
> +	printf "     1\tCTO <cto@company.xx>\n" >expect &&
> +
> +	git shortlog -es --author=CTO HEAD >actual &&
> +	test_cmp expect actual &&
> +
> +	printf "     2\tOther Author <other@author.xx>\n" >expect &&
> +
> +	git shortlog -es --author="Other Author" HEAD >actual &&
> +	test_cmp expect actual &&
> +
> +	printf "     2\tSanta Claus <santa.claus@northpole.xx>\n" >expect &&
> +
> +	git shortlog -es --author="Santa Claus" HEAD >actual &&
> +	test_cmp expect actual &&
> +
> +	printf "     1\tSome Dude <some@dude.xx>\n" >expect &&
> +
> +	git shortlog -es --author="Some Dude" HEAD >actual &&
> +	test_cmp expect actual
> +'
> +
>  # git log with --pretty format which uses the name and email mailmap placemarkers
>  cat >expect <<\EOF
>  Author CTO <cto@coompany.xx> maps to CTO <cto@company.xx>

Makes sense. Not saying this is how it should be, just an equivalently
working patch that I came up with on top while poing at this:

    diff --git a/builtin/shortlog.c b/builtin/shortlog.c
    index a6fb00ade8..ad84d70d07 100644
    --- a/builtin/shortlog.c
    +++ b/builtin/shortlog.c
    @@ -188,10 +188,9 @@ static void get_from_rev(struct rev_info *rev, struct shortlog *log)
     {
     	struct commit *commit;

    -	rev->mailmap = &log->mailmap;
    -
     	if (prepare_revision_walk(rev))
     		die(_("revision walk setup failed"));
    +	rev->mailmap = &log->mailmap;
     	while ((commit = get_revision(rev)) != NULL)
     		shortlog_add_commit(log, commit);
     }
    diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
    index 9bee35b06c..74a269052d 100755
    --- a/t/t4203-mailmap.sh
    +++ b/t/t4203-mailmap.sh
    @@ -384,17 +384,6 @@ test_expect_success 'Shortlog output (complex mapping)' '
     '

     test_expect_success 'Shortlog output (complex mapping, filtered)' '
    -
    -	printf "     1\tA U Thor <author@example.com>\n" >expect &&
    -
    -	git shortlog -es --author="A U Thor" HEAD >actual &&
    -	test_cmp expect actual &&
    -
    -	printf "     1\tCTO <cto@company.xx>\n" >expect &&
    -
    -	git shortlog -es --author=CTO HEAD >actual &&
    -	test_cmp expect actual &&
    -
     	printf "     2\tOther Author <other@author.xx>\n" >expect &&

     	git shortlog -es --author="Other Author" HEAD >actual &&

I.e. we just need the assignment after prepare_revision_walk() and the
first 2x tests were things that passed before this change.

So that's not a "let's squash that on top" but "I was poking at this and
here's stuff that I fiddled with or surprised me slightly".