Re: Keep original author with git merge --squash?

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Jeff King <peff@xxxxxxxx> writes:

> What happens if there is no "Author:" line in the output?

I've been assuming that we would do what the current code does.
"git commit --amend" for example internally remembers who the
original author was and uses that, without paying any attention to
the result from the editor.  If there is no "Author:", that would
not change.

And I do not think we need to be able to say "Oops, I forgot to pass
the --reset-author option from the command line", personally, so...

> So probably a saner thing is that a missing "Author:" line does nothing,

yes and

> and using "Author: " (with no text) does a reset.

no (I do not think it is wrong per-se, but I do not think such a
good idea).

> Also, on the topic of "merge --squash". I never use it myself, but
> having experimented with it due to this thread, I found the template it
> sticks into COMMIT_EDITMSG to be horribly unfriendly for munging. For
> example, with two simple commits, I get:
>
>     Squashed commit of the following:
>     
>     commit 6821a8ac920ed00675e4aec10dcef705211105cd
>     Author: Jeff King <peff@xxxxxxxx>
>     Date:   Thu Feb 12 17:39:28 2015 -0500
>     
>         commit subject 2
>     
>         commit body 2
>     
>     commit b0840bb4bbfe00b6ed8c7c4d483f11d126fa2d69
>     Author: Jeff King <peff@xxxxxxxx>
>     Date:   Thu Feb 12 17:39:28 2015 -0500
>     
>         commit subject 1
>     
>         commit body 1
>
> I guess that is helpful if you want to keep a complete log of what got
> squashed, but I doubt that is the common case (if you did, then doing a
> real merge would probably be in order).

I think it should show exactly the same thing as "rebase -i" squash
insn would give you.  People already know how to munge that, right?

> It also raises a question for the proposal in this thread: if there are
> multiple "Author:" lines, which one do we take? The first, or the last?

I was siding with David's "pay attention to in-buffer Author: only
when all of them agree".  When squash-merging a branch with two or
more authors, we would attribute the authorship silently and
automatically to you if you do not do anything special otherwise.

Possible alternatives when multiple "Author:"s do not agree are:

 - use you who is playing the integrator;

 - use the tip;

 - use the one that most often appears; or

 - error out and ask the user to leave only one (or zero--if you
   want to take the authorship) by re-attempting "git commit".

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