Re: [PATCH v4 0/6] Nominating "whatchanged" for removal

>
> "git whatchanged" has outlived its usefulness when "git log" with
> various diff-related options more than 10 years ago.  It is not even
> shorter to type than its rough equivalent "git log --raw".  It is
> high time to start seeing if it is still being used, declare its
> official deprecation, and announce its removal in the future.
>
> This iteration is more complete than the previous two iterations:
>
>  * The first step is to refactor the mechanism to show the message
>    to ask users to contact git@vger that they still use the command,
>    out of "git pack-redundant" implementation.  This message is
>    shown when the "--i-still-use-this" option is not passed to a
>    command that requires it.
>
>  * The second and the third step are to remove unnecessary mentions
>    of "whatchanged" from our documentation and tests.  With these,
>    we have fewer places that we need to adjust when the command gets
>    truly removed.
>
>  * Then we start to require that the "--i-still-use-this" option is
>    passed from the command line.  This requires adjustment for tests
>    that protect the behaviour of the command, as they must now pass
>    the required option just like end-users.
>
>  * The last two steps are for a future.  In order to make sure that
>    we can cleanly ditch the feature at some future date by removing
>    it from the build, test, and documentation when Git is built with
>    WITH_BREAKING_CHANGES.  And finally we add "whatchanged" to the
>    list of features to be removed in the BreakingChanges document.
>
> This iteration incorporates updated log messages, and a missing
> period in the documentation, helped by Elijah.
>
>
> Junio C Hamano (6):
>   you-still-use-that??: help deprecating commands for removal
>   doc: prepare for a world without whatchanged
>   tests: prepare for a world without whatchanged
>   whatchanged: require --i-still-use-this
>   whatchanged: remove when built with WITH_BREAKING_CHANGES
>   whatschanged: list it in BreakingChanges document
>
>  Documentation/BreakingChanges.adoc           |  9 ++++++
>  Documentation/MyFirstObjectWalk.adoc         |  4 +--
>  Documentation/config/format.adoc             |  6 ++++
>  Documentation/config/log.adoc                | 11 +++++--
>  Documentation/git-whatchanged.adoc           | 10 ++++--
>  Documentation/pretty-options.adoc            |  5 +++
>  Documentation/rev-list-options.adoc          |  9 ++++--
>  Documentation/technical/sparse-checkout.adoc |  2 +-
>  Documentation/user-manual.adoc               |  2 +-
>  builtin/log.c                                | 19 +++++++++++
>  builtin/pack-redundant.c                     | 10 ++----
>  git-compat-util.h                            |  2 ++
>  git.c                                        |  2 ++
>  t/t4013-diff-various.sh                      | 27 ++++++++++++++--
>  t/t4202-log.sh                               | 34 ++++++++++++++------
>  t/t5323-pack-redundant.sh                    |  5 +++
>  t/t9300-fast-import.sh                       | 12 +++----
>  t/t9301-fast-import-notes.sh                 |  2 +-
>  usage.c                                      | 12 +++++++
>  19 files changed, 146 insertions(+), 37 deletions(-)
>
> Range-diff against v3: