From: Denton Liu <liu.denton@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Git Mailing List <git@vger.kernel.org>
Subject: Re: [PATCH v3 09/10] builtin/diff-tree: learn --merge-base
Date: Fri, 18 Sep 2020 03:48:33 -0700 [thread overview]
Message-ID: <20200918104833.GB1874074@generichostname> (raw)
In-Reply-To: <xmqq363gs1mt.fsf@gitster.c.googlers.com>
On Thu, Sep 17, 2020 at 11:23:54AM -0700, Junio C Hamano wrote:
> Denton Liu <liu.denton@gmail.com> writes:
>
> > + if (read_stdin && merge_base)
> > + die(_("--stdin and --merge-base are mutually exclusive"));
> > +
> > + if (merge_base) {
> > + struct object_id oid;
> > +
> > + if (opt->pending.nr != 2)
> > + die(_("--merge-base only works with two commits"));
> > +
> > + diff_get_merge_base(opt, &oid);
> > + opt->pending.objects[0].item = lookup_object(the_repository, &oid);
> > + }
> > +
>
> This looks quite straight-forward.
>
> > - /*
> > - * We saw two trees, ent0 and ent1. If ent1 is uninteresting,
> > - * swap them.
> > - */
> > - if (ent1->item->flags & UNINTERESTING)
> > - swap = 1;
> > - oid[swap] = &ent0->item->oid;
> > - oid[1 - swap] = &ent1->item->oid;
> > + if (merge_base) {
> > + diff_get_merge_base(revs, &mb_oid);
> > + oid[0] = &mb_oid;
> > + oid[1] = &revs->pending.objects[1].item->oid;
> > + } else {
> > + int swap = 0;
> > +
> > + /*
> > + * We saw two trees, ent0 and ent1. If ent1 is uninteresting,
> > + * swap them.
> > + */
> > + if (ent1->item->flags & UNINTERESTING)
> > + swap = 1;
> > + oid[swap] = &ent0->item->oid;
> > + oid[1 - swap] = &ent1->item->oid;
> > + }
>
> It is not entirely clear why the original has to become an [else]
> clause here, unlike the change we saw earlier in cmd_diff_tree().
> It feels quite inconsistent.
Since we're only interested in the oids, I thought that it would be
possible to save a lookup_object() and just use the oids directly. If
it's clearer, this can be written as something like this but the lookup
feels unnecessary:
/*
* We saw two trees, ent0 and ent1. If ent1 is uninteresting,
* swap them.
*/
if (ent1->item->flags & UNINTERESTING)
swap = 1;
if (merge_base) {
struct object_id mb_oid;
if (swap)
BUG("swap is unexpectedly set");
if (diff_get_merge_base(revs, &mb_oid))
exit(128);
ent0->item = lookup_object(the_repository, &mb_oid);
}
oid[swap] = &ent0->item->oid;
oid[1 - swap] = &ent1->item->oid;
Thanks,
Denton
next prev parent reply other threads:[~2020-09-18 10:48 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-05 19:08 [PATCH 0/4] builtin/diff: learn --merge-base Denton Liu
2020-09-05 19:08 ` [PATCH 1/4] t4068: remove unnecessary >tmp Denton Liu
2020-09-05 19:08 ` [PATCH 2/4] git-diff.txt: backtick quote command text Denton Liu
2020-09-05 19:08 ` [PATCH 3/4] builtin/diff: parse --no-index using parse_options() Denton Liu
2020-09-05 19:08 ` [PATCH 4/4] builtin/diff: learn --merge-base Denton Liu
2020-09-06 21:58 ` Junio C Hamano
2020-09-10 7:32 ` [PATCH v2 0/4] " Denton Liu
2020-09-10 7:32 ` [PATCH v2 1/4] t4068: remove unnecessary >tmp Denton Liu
2020-09-10 7:32 ` [PATCH v2 2/4] git-diff.txt: backtick quote command text Denton Liu
2020-09-10 7:32 ` [PATCH v2 3/4] builtin/diff: parse --no-index using parse_options() Denton Liu
2020-09-10 18:35 ` Junio C Hamano
2020-09-13 8:31 ` Denton Liu
2020-09-13 21:45 ` Junio C Hamano
2020-09-10 7:32 ` [PATCH v2 4/4] builtin/diff: learn --merge-base Denton Liu
2020-09-17 7:44 ` [PATCH v3 00/10] " Denton Liu
2020-09-17 7:44 ` [PATCH v3 01/10] t4068: remove unnecessary >tmp Denton Liu
2020-09-17 7:44 ` [PATCH v3 02/10] git-diff-index.txt: make --cached description a proper sentence Denton Liu
2020-09-17 7:44 ` [PATCH v3 03/10] git-diff.txt: backtick quote command text Denton Liu
2020-09-17 7:44 ` [PATCH v3 04/10] contrib/completion: extract common diff/difftool options Denton Liu
2020-09-17 7:44 ` [PATCH v3 05/10] diff-lib: accept option flags in run_diff_index() Denton Liu
2020-09-17 17:00 ` Junio C Hamano
2020-09-17 7:44 ` [PATCH v3 06/10] diff-lib: define diff_get_merge_base() Denton Liu
2020-09-17 17:16 ` Junio C Hamano
2020-09-18 10:34 ` Denton Liu
2020-09-19 0:33 ` Junio C Hamano
2020-09-17 7:44 ` [PATCH v3 07/10] t4068: add --merge-base tests Denton Liu
2020-09-17 7:44 ` [PATCH v3 08/10] builtin/diff-index: learn --merge-base Denton Liu
2020-09-17 17:28 ` Junio C Hamano
2020-09-17 18:13 ` Jeff King
2020-09-18 5:11 ` Junio C Hamano
2020-09-18 18:12 ` Jeff King
2020-09-17 7:44 ` [PATCH v3 09/10] builtin/diff-tree: " Denton Liu
2020-09-17 18:23 ` Junio C Hamano
2020-09-18 10:48 ` Denton Liu [this message]
2020-09-18 16:52 ` Junio C Hamano
2020-09-20 11:01 ` Denton Liu
2020-09-21 16:05 ` Junio C Hamano
2020-09-21 17:27 ` Denton Liu
2020-09-21 21:09 ` Junio C Hamano
2020-09-21 21:19 ` Junio C Hamano
2020-09-21 21:54 ` Denton Liu
2020-09-21 22:18 ` Junio C Hamano
2020-09-23 9:47 ` Denton Liu
2020-09-25 21:02 ` Junio C Hamano
2020-09-26 1:52 ` Denton Liu
2020-09-17 7:44 ` [PATCH v3 10/10] contrib/completion: complete `git diff --merge-base` Denton Liu
2020-09-20 11:22 ` [PATCH v4 00/10] builtin/diff: learn --merge-base Denton Liu
2020-09-20 11:22 ` [PATCH v4 01/10] t4068: remove unnecessary >tmp Denton Liu
2020-09-20 11:22 ` [PATCH v4 02/10] git-diff-index.txt: make --cached description a proper sentence Denton Liu
2020-09-20 11:22 ` [PATCH v4 03/10] git-diff.txt: backtick quote command text Denton Liu
2020-09-20 11:22 ` [PATCH v4 04/10] contrib/completion: extract common diff/difftool options Denton Liu
2020-09-20 11:22 ` [PATCH v4 05/10] diff-lib: accept option flags in run_diff_index() Denton Liu
2020-09-20 11:22 ` [PATCH v4 06/10] diff-lib: define diff_get_merge_base() Denton Liu
2020-09-20 11:22 ` [PATCH v4 07/10] t4068: add --merge-base tests Denton Liu
2020-09-20 11:22 ` [PATCH v4 08/10] builtin/diff-index: learn --merge-base Denton Liu
2020-09-29 19:53 ` Martin Ågren
2020-09-20 11:22 ` [PATCH v4 09/10] builtin/diff-tree: " Denton Liu
2020-09-20 11:22 ` [PATCH v4 10/10] contrib/completion: complete `git diff --merge-base` Denton Liu
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