bug#60126: 30.0.50; vc-git-checkin: Offer to unstage conflicting changes

[Sean Whitton <spwhitton@spwhitton.name>]

Hello,

On Sat 24 Dec 2022 at 09:26PM +02, Dmitry Gutov wrote:

> On 24/12/2022 20:22, Sean Whitton wrote:
>
>> Now that we understand clearly what we want it to do, I bet the code in
>> vc-checkin-git could be simplified (vc-git--stash-staged-changes is
>> fine).  So I'll see about doing that, with some tests, as you suggest.
>> Let me ask you about the parsing of the 'diff --git' lines.
> ...
>> Do you have any better ideas of how to extract the filename from the git
>> --diff line, or perhaps a proof that my approach can't fail? :)
>
> I don't know. You could try
>
>   (and (looking-at diff-file-header-re) (match-string 1))
>
> instead, but it matches a different line (one that starts with "---").

That seems better, thank you.

>> I wasn't happy with my regexp approach to extracting the filename.
>> I'm not sure it can actually fail, but the current codes assumes it
>> can, and that adds complexity.
>
> Not sure which failure you are referring to, but the process of removing
> already-staged hunks from vc-git-patch-string can indeed fail, because the
> hunks might be staged, or might be not. The idea was to support both
> situations.

I meant that my regexp might fail to correctly parse the 'diff --git'
line, and then the code goes straight to "Index not empty."

>> The --src-prefix, --dst-prefix and --no-prefix options to git-diff(1)
>> might be relevant, but then we couldn't use a simple string-match to
>> find hunks in vc-git-patch-string.
>
> Right.
>

-- 
Sean Whitton