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From: K Jayatheerth <jayatheerthkulkarni2005@gmail•com>
To: ericsalem@gmail•com
Cc: git@vger•kernel.org
Subject: Re Behavior of git log --diff-filter=d
Date: Thu,  3 Jul 2025 19:12:20 +0530	[thread overview]
Message-ID: <20250703134220.31638-1-jayatheerthkulkarni2005@gmail.com> (raw)
In-Reply-To: <64308d3f-281b-49a3-bc10-57878903bf4c@gmail.com>

Hi Eric,

Nice question

Yes, this is expected behavior
You're seeing a difference because

--diff-filter=d tells Git to exclude commits that have deleted files in their diffs.
However, this filter only applies if there is a diff to filter.

In other words, 
if you run git log --format="%H" --diff-filter=d, 
Git doesn't show any output unless 
the diff logic is actually invoked. 
But --format="%H" alone does not invoke diff generation...
so --diff-filter silently does nothing.

When you add --stat or --name-only, 
you're explicitly telling Git: 
"Please compute the diff". 

Now Git has something to filter, 
and it applies --diff-filter=d 
to exclude those diffs that involve deletions.

If you want to exclude deletion commits and get just commit hashes
This is something I think should work
probably set this up with an alias if you use this many times

git log --format="%H" --diff-filter=d --name-only | grep -v '^$'

This should work just fine...

Or perhaps if you wanna tinker more
git log --format="%H" --diff-filter=d --stat | grep -B1 -v "delete mode"

But if you're just trying to filter commits 
by file change type and want to see 
only those hashes where a deleted file is not present, 
you'll need some way to trigger the diff 
even if you discard the output later.

Hope that helps :)

Thank you,

- Jayatheerth

next prev parent reply	other threads:[~2025-07-03 13:42 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-07-02 20:28 Behavior of git log --diff-filter=d Eric Salem
2025-07-03 13:42 ` K Jayatheerth [this message]
2025-07-03 15:36   ` Re " Jeff King
2025-07-03 21:30   ` Eric Salem
2025-07-03 15:34 ` Jeff King
2025-07-03 22:44   ` [PATCH] setup_revisions(): turn on diffs for all-negative diff filter Jeff King
2025-07-03 23:42     ` Eric Salem
2025-07-04 13:30     ` Karthik Nayak
2025-07-07  5:31     ` Junio C Hamano

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