From: Stefan Beller <sbeller@google.com>
To: Jonathan Nieder <jrnieder@gmail.com>
Cc: git <git@vger.kernel.org>, Junio C Hamano <gitster@pobox.com>,
Jeff King <peff@peff.net>
Subject: Re: [PATCH] diffcore: add a filter to find a specific blob
Date: Thu, 14 Dec 2017 14:30:22 -0800 [thread overview]
Message-ID: <CAGZ79kZdUuoM79n09ziG0F7WCWNLpZ2AiFA6fb_qgND1b3_F9A@mail.gmail.com> (raw)
In-Reply-To: <20171214212234.GC32842@aiede.mtv.corp.google.com>
On Thu, Dec 14, 2017 at 1:22 PM, Jonathan Nieder <jrnieder@gmail.com> wrote:
> - what about mode changes? If the file became executable but the
> blob content didn't change, does that commit match?
./git log --find-object=$(git rev-parse ba67504f:t/perf/p3400-rebase.sh)
claims it does find the mode change (commit ba67504f is just a mode
change)
> - are copies and renames shown (if I am passing -M -C)?
It restricts the commits shown, not the renamed files. But I assume
you mean it the same way as with mode changes.
I did not find a good commit in gits history to demonstrate, but as
it is orthogonal to the object id restrictions, I would think it works
> Nit, not related to this change: it would be nice to have a long
> option to go along with the short name '-t' --- e.g. --include-trees.
follow up patches welcome. :)
>
> Another nit: s/gitlink entry/submodule commit/, perhaps. The commit
> object is not a gitlink entry: it is pointed to by a gitlink entry.
Well, what if the user doesn't have a submodule, but uses gitlinks
for other purposes? We do inspect the gitlink, so it is correct IMHO.
> Another documentation idea: it may be nice to point out that this
> is only about the preimage and postimage submodule commit and that
> it doesn't look at the history in between.
That is sensible. One might be tempted to ask: "Which superproject
commit contains a submodule pointer, that has commit $X in the
submodule history?", but this new option is totally not answering this.
>> The
>> reason why these commits both occur prior to v2.0.0 are evil
>> merges that are not found using this new mechanism.
>
> Would it be worth the doc mentioning that this doesn't look at merges
> unless you use one of the -m/-c/--cc options, or does that go without
> saying?
I assumed it goes without saying, just like the lacking -t could mean
to ignore trees. ;)
>
> [...]
>> --- a/Documentation/diff-options.txt
>> +++ b/Documentation/diff-options.txt
>> @@ -500,6 +500,12 @@ information.
>> --pickaxe-regex::
>> Treat the <string> given to `-S` as an extended POSIX regular
>> expression to match.
>> +
>> +--find-object=<object-id>::
>> + Restrict the output such that one side of the diff
>> + matches the given object id. The object can be a blob,
>> + gitlink entry or tree (when `-t` is given).
>
> I like this name --find-object more than --blobfind! I am not sure it
> quite matches what the user is looking for, though. We are not
> looking for all occurences of the object; we only care about when the
> object appears (was added or removed) in the diff.
Thanks! Yes, but the 'edges' are so few commits that a further walk
will reveal all you need to know?
>
> Putting it in context, we have:
>
> pickaxe options:
> -S: detect changes in occurence count of a string
> -G: grep lines in diff for a string
>
> --pickaxe-all:
> do not filter the diff when the patch matches pickaxe
> conditions.
>
> kind of like log --full-diff, but restricted to pickaxe
> options.
> --pickaxe-regex: treat -S argument as a regex, not a string
>
> Is this another kind of pickaxe option? It feels similar to -S, but
> at an object level instead of a substring level, so in a way it would
> be appealing to call it --pickaxe-object. Does --pickaxe-all affect
> it like it affects -S and -G?
>
> Another context to put it in is:
>
> --diff-filter:
> limit paths (but not commits?) to those with a change
> matching optarg
>
> If I understand correctly, then --diff-filter does not interact with
> --pickaxe-all, or in other words it is a different filtering
> condition. Is this another kind of diff filter? In that context, it
> may be appealing to call it something like --object-filter.
>
> --diff-filter is an example where it seems appealing to have a
> --full-diff option to diff-tree that could apply to all filters and
> not just pickaxe.
>
> [... implementation snipped ...]
>
> The implementation looks lovely and I'm especially happy about the
> tests. Thanks for writing it.
>
> Thoughts?
> Jonathan
Regarding finding a better name, I would want to hear from others,
I am happy with --find-object, though I can see --pickaxe-object
or --object--filter to be a good narrative as well.
Stefan
next prev parent reply other threads:[~2017-12-14 22:30 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-08 0:24 [PATCH 0/1] diffcore-blobfind Stefan Beller
2017-12-08 0:24 ` [PATCH 1/1] diffcore: add a filter to find a specific blob Stefan Beller
2017-12-08 9:34 ` Jeff King
2017-12-08 16:28 ` Ramsay Jones
2017-12-08 20:19 ` Jeff King
2017-12-08 20:39 ` Stefan Beller
2017-12-08 21:38 ` Jeff King
2017-12-08 15:04 ` Junio C Hamano
2017-12-08 17:21 ` Junio C Hamano
2017-12-08 21:11 ` Stefan Beller
2017-12-08 21:15 ` Junio C Hamano
2017-12-11 19:58 ` [PATCH 0/1] diff-core blobfind Stefan Beller
2017-12-11 19:58 ` [PATCH 1/1] diffcore: add a filter to find a specific blob Stefan Beller
2017-12-11 23:17 ` Junio C Hamano
2017-12-12 0:21 ` Stefan Beller
2017-12-12 1:24 ` [PATCH] " Stefan Beller
2017-12-12 18:36 ` Junio C Hamano
2017-12-14 21:22 ` Jonathan Nieder
2017-12-14 22:30 ` Stefan Beller [this message]
2017-12-14 22:52 ` Jonathan Nieder
2017-12-15 2:18 ` Junio C Hamano
2017-12-27 18:49 ` Stefan Beller
2017-12-27 18:59 ` Jonathan Nieder
2017-12-27 19:57 ` Junio C Hamano
2017-12-14 22:44 ` Junio C Hamano
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAGZ79kZdUuoM79n09ziG0F7WCWNLpZ2AiFA6fb_qgND1b3_F9A@mail.gmail.com \
--to=sbeller@google.com \
--cc=git@vger.kernel.org \
--cc=gitster@pobox.com \
--cc=jrnieder@gmail.com \
--cc=peff@peff.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).