Re: [PATCH v3] git{,-blame}.el: remove old bitrotting Emacs code

[Jonathan Nieder <jrnieder@gmail.com>]

Hi,

Ævar Arnfjörð Bjarmason wrote[1]:

> The git-blame.el mode has been superseded by Emacs's own
> vc-annotate (invoked by C-x v g). Users of the git.el mode are now
> much better off using either Magit or the Git backend for Emacs's own
> VC mode.
>
> These modes were added over 10 years ago when Emacs's own Git support
> was much less mature, and there weren't other mature modes in the wild
> or shipped with Emacs itself.
>
> These days these modes have few if any users, and users of git aren't
> well served by us shipping these (some OS's install them alongside git
> by default, which is confusing and leads users astray).
>
> So let's remove these per Alexandre Julliard's message to the
> ML[1]. If someone still wants these for some reason they're better
> served by hosting these elsewhere (e.g. on ELPA), instead of us
> distributing them with git.

The trouble with removing these so abruptly is that it makes for a bad
user experience.

  Warning (initialization): An error occurred while loading ‘/home/jrn/.emacs’:

  File error: Cannot open load file, No such file or directory, git

In some sense that is the distributor's fault: just because Git
upstream stops removing the git.el file doesn't mean that the
distributor needs to.  But the same thing would happen if the user
symlinked git.el into a place that emacs could find when using
upstream Git directly.  And we are putting the distributor in a bad
place.

Ami Fischman (cc-ed) writes:

| IMO a placeholder git.el that did something like:
|
|   (error "git.el is no more; replace (require 'git) with (require 'magit) or
|   simply delete the former in your initialization file(s)")
|
| ideally with a pointer to a short URL explaining the rationale would have
| been fine.
| (note that though I've seen
| https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=893734 I'm _still_ unclear
| as to why the change was made; you might want to clarify in that bug and
| point to it from this, or something else)

What do you think?  Would adding such a placeholder during a
transitional period work well for you?

Thanks,
Jonathan

[1] https://public-inbox.org/git/20180310184545.16950-1-avarab@gmail.com/