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From: Jonathan Tan <jonathantanmy@google.com>
To: emilyshaffer@google.com
Cc: git@vger.kernel.org, gitster@pobox.com, sunshine@sunshineco.com,
	Jonathan Tan <jonathantanmy@google.com>
Subject: Re: [PATCH v3] documentation: add tutorial for revision walking
Date: Wed, 24 Jul 2019 16:32:53 -0700	[thread overview]
Message-ID: <20190724233253.208318-1-jonathantanmy@google.com> (raw)
In-Reply-To: <20190701201934.30321-1-emilyshaffer@google.com>

Thanks - I think this is a useful guide to what can be a complicated
topic. It looks good overall; I just have some minor comments below.

> diff --git a/Documentation/Makefile b/Documentation/Makefile
> index 76f2ecfc1b..91e5da67c4 100644
> --- a/Documentation/Makefile
> +++ b/Documentation/Makefile
> @@ -78,6 +78,7 @@ SP_ARTICLES += $(API_DOCS)
>  
>  TECH_DOCS += MyFirstContribution
>  TECH_DOCS += SubmittingPatches
> +TECH_DOCS += MyFirstRevWalk

Any reason why this is not in alphabetical order?

> +Also add the relevant line in `builtin.h` near `cmd_whatchanged()`:
> +
> +----
> +extern int cmd_walken(int argc, const char **argv, const char *prefix);
> +----

builtin.h no longer has "extern", so we can delete it.

> +Add it to the `Makefile` near the line for `builtin\worktree.o`:
> +
> +----
> +BUILTIN_OBJS += builtin/walken.o
> +----

In the first line, change the backslash to a slash. (The line in
Makefile for "builtin/worktree.o" uses a forward slash as expected.)

> +NOTE: For a more exhaustive overview of the new command process, take a look at
> +`Documentation/MyFirstContribution.txt`.
> +
> +NOTE: A reference implementation can be found at TODO LINK.

I think you have a reference implementation at
https://github.com/nasamuffin/git/tree/revwalk?

> +We'll start by enabling all types of objects in the `struct rev_info`. Unless
> +you cloned or fetched your repository earlier with a filter,
> +`exclude_promisor_objects` is unlikely to make a difference, but we'll turn it
> +on just to make sure our lives are simple. We'll also turn on
> +`tree_blobs_in_commit_order`, which means that we will walk a commit's tree and
> +everything it points to immediately after we find each commit, as opposed to
> +waiting for the end and walking through all trees after the commit history has
> +been discovered. With the appropriate settings configured, we are ready to call
> +`prepare_revision_walk()`.
> +
> +----
> +static void walken_object_walk(struct rev_info *rev)
> +{
> +	rev->tree_objects = 1;
> +	rev->blob_objects = 1;
> +	rev->tag_objects = 1;
> +	rev->tree_blobs_in_commit_order = 1;
> +	rev->exclude_promisor_objects = 1;

Optional: I think we should not bother with exclude_promisor_objects. If
the user really cloned with a filter, then every object would be a
promisor object and the revision walk should output nothing, which is
very confusing.

  parent reply	other threads:[~2019-07-24 23:32 UTC|newest]

Thread overview: 102+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-07  1:07 [PATCH] documentation: add tutorial for revision walking Emily Shaffer
2019-06-07  1:07 ` [RFC PATCH 00/13] example implementation of revwalk tutorial Emily Shaffer
2019-06-07  1:07   ` [RFC PATCH 01/13] walken: add infrastructure for revwalk demo Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 02/13] walken: add usage to enable -h Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 03/13] walken: add placeholder to initialize defaults Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 04/13] walken: add handler to git_config Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 05/13] walken: configure rev_info and prepare for walk Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 06/13] walken: perform our basic revision walk Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 07/13] walken: filter for authors from gmail address Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 08/13] walken: demonstrate various topographical sorts Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 09/13] walken: demonstrate reversing a revision walk list Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 10/13] walken: add unfiltered object walk from HEAD Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 11/13] walken: add filtered object walk Emily Shaffer
2019-06-07 19:15     ` Jeff Hostetler
2019-06-17 20:30       ` Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 12/13] walken: count omitted objects Emily Shaffer
2019-06-07  1:08   ` [RFC PATCH 13/13] walken: reverse the object walk order Emily Shaffer
2019-06-07  6:21 ` [PATCH] documentation: add tutorial for revision walking Eric Sunshine
2019-06-10 21:26   ` Junio C Hamano
2019-06-10 21:38     ` Eric Sunshine
2019-06-17 23:19   ` Emily Shaffer
2019-06-19  8:13     ` Eric Sunshine
2019-06-19 23:35       ` Emily Shaffer
2019-06-23 18:54         ` Eric Sunshine
2019-06-10 20:25 ` Junio C Hamano
2019-06-17 23:50   ` Emily Shaffer
2019-06-19 15:17     ` Junio C Hamano
2019-06-20 21:06       ` Emily Shaffer
2019-07-13  0:39         ` Josh Steadmon
2019-07-16  0:06           ` Emily Shaffer
2019-07-16 17:24             ` Junio C Hamano
2019-06-10 20:49 ` Junio C Hamano
2019-06-17 23:33   ` Emily Shaffer
2019-06-26 23:49 ` [PATCH v2] " Emily Shaffer
2019-06-26 23:50   ` [RFC PATCH v2 00/13] example implementation of revwalk tutorial Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 01/13] walken: add infrastructure for revwalk demo Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 02/13] walken: add usage to enable -h Emily Shaffer
2019-06-27  4:47       ` Eric Sunshine
2019-06-27 18:40         ` Emily Shaffer
2019-06-27  4:50       ` Eric Sunshine
2019-06-26 23:50     ` [RFC PATCH v2 03/13] walken: add placeholder to initialize defaults Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 04/13] walken: add handler to git_config Emily Shaffer
2019-06-27  4:54       ` Eric Sunshine
2019-06-27 18:47         ` Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 05/13] walken: configure rev_info and prepare for walk Emily Shaffer
2019-06-27  5:06       ` Eric Sunshine
2019-06-27 18:56         ` Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 06/13] walken: perform our basic revision walk Emily Shaffer
2019-06-27  5:16       ` Eric Sunshine
2019-06-27 20:54         ` Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 07/13] walken: filter for authors from gmail address Emily Shaffer
2019-06-27  5:20       ` Eric Sunshine
2019-06-27 20:58         ` Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 08/13] walken: demonstrate various topographical sorts Emily Shaffer
2019-06-27  5:22       ` Eric Sunshine
2019-06-27 22:12         ` Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 09/13] walken: demonstrate reversing a revision walk list Emily Shaffer
2019-06-27  5:26       ` Eric Sunshine
2019-06-27 22:20         ` Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 10/13] walken: add unfiltered object walk from HEAD Emily Shaffer
2019-06-27  5:37       ` Eric Sunshine
2019-06-27 22:31         ` Emily Shaffer
2019-06-28  0:48           ` Eric Sunshine
2019-07-01 19:19             ` Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 11/13] walken: add filtered object walk Emily Shaffer
2019-06-27  5:42       ` Eric Sunshine
2019-06-27 22:33         ` Emily Shaffer
2019-06-26 23:50     ` [RFC PATCH v2 12/13] walken: count omitted objects Emily Shaffer
2019-06-27  5:44       ` Eric Sunshine
2019-06-26 23:50     ` [RFC PATCH v2 13/13] walken: reverse the object walk order Emily Shaffer
2019-06-27 22:56     ` [RFC PATCH v2 00/13] example implementation of revwalk tutorial Emily Shaffer
2019-07-01 20:19   ` [PATCH v3] documentation: add tutorial for revision walking Emily Shaffer
2019-07-01 20:20     ` [RFC PATCH v3 00/13] example implementation of revwalk tutorial Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 01/13] walken: add infrastructure for revwalk demo Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 02/13] walken: add usage to enable -h Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 03/13] walken: add placeholder to initialize defaults Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 04/13] walken: add handler to git_config Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 05/13] walken: configure rev_info and prepare for walk Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 06/13] walken: perform our basic revision walk Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 07/13] walken: filter for authors from gmail address Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 08/13] walken: demonstrate various topographical sorts Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 09/13] walken: demonstrate reversing a revision walk list Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 10/13] walken: add unfiltered object walk from HEAD Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 11/13] walken: add filtered object walk Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 12/13] walken: count omitted objects Emily Shaffer
2019-07-01 20:20       ` [RFC PATCH v3 13/13] walken: reverse the object walk order Emily Shaffer
2019-07-25  9:25       ` [RFC PATCH v3 00/13] example implementation of revwalk tutorial Johannes Schindelin
2019-08-06 23:13         ` Emily Shaffer
2019-08-08 19:19           ` Johannes Schindelin
2019-07-24 23:11     ` [PATCH v3] documentation: add tutorial for revision walking Josh Steadmon
2019-07-24 23:32     ` Jonathan Tan [this message]
2019-08-06 23:10       ` Emily Shaffer
2019-08-06 23:19     ` [PATCH v4] " Emily Shaffer
2019-08-07 19:19       ` Junio C Hamano
2019-08-14 18:33         ` Emily Shaffer
2019-08-14 19:18           ` Junio C Hamano
2019-10-10 15:19       ` [PATCH v5] documentation: add tutorial for object walking Emily Shaffer
2019-10-11  5:50         ` Junio C Hamano
2019-10-11 23:26           ` Emily Shaffer
2019-10-11 17:50         ` SZEDER Gábor
2019-10-11 23:33           ` Emily Shaffer
2019-10-11 23:55         ` [PATCH v6] " Emily Shaffer

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