RE: Proposal: tell git a file has been renamed

[<rsbecker@nexbridge.com>]

On Saturday, April 22, 2023 3:54 PM, Jeremy Morton wrote:
>Subject: Re: Proposal: tell git a file has been renamed
>
>https://stackoverflow.com/a/1094392/178757
>
>says:
>
>git mv oldname newname
>
>is just shorthand for:
>
>mv oldname newname
>git add newname
>git rm oldname

The above stackoverflow topic is from 2009. A lot has changed since then. My test follows. Please note the status and git log contents indicating the rename.

$ mkdir test2
$ cd test2
$ git init
$ echo "Initial" > file1
$ git add file1
$ commit -m "Commit 1"
$ git mv file1 file2
$ git status
On branch master
Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
        renamed:    file1 -> file2
$ git commit -m "Rename"
$ git log --patch
commit 014068fcedaf361f45c356046cf513b79537f53f (HEAD -> master)
Author: Randall S. Becker <rsbecker@nexbridge.com>
Date:   Sat Apr 22 18:02:07 2023 -0400

    Rename

diff --git a/file1 b/file2
similarity index 100%
rename from file1
rename to file2

commit 235a33801b82eac67e25c57e512ca428f2d49cea
Author: Randall S. Becker <rsbecker@nexbridge.com>
Date:   Sat Apr 22 18:01:48 2023 -0400

    Commit 1

diff --git a/file1 b/file1
new file mode 100644
index 0000000..a77fa51
--- /dev/null
+++ b/file1
@@ -0,0 +1 @@
+Initial

>
>On 22/04/2023 20:47, rsbecker@nexbridge.com wrote:
>> No, history is preserved in the rename.
>>
>>> -----Original Message-----
>>> From: Jeremy Morton <admin@game-point.net>
>>> Sent: Saturday, April 22, 2023 3:45 PM
>>> To: rsbecker@nexbridge.com; git@vger.kernel.org
>>> Subject: Re: Proposal: tell git a file has been renamed
>>>
>>> I read that git mv is basically the equivalent to deleting the old
>>> file, creating the new file, and adding the changes.  Isn't it?  If
>>> so it's gonna have the same problem as I have now.
>>>
>>> --
>>> Best regards,
>>> Jeremy Morton (Jez)
>>>
>>> On 22/04/2023 19:54, rsbecker@nexbridge.com wrote:
>>>> On Saturday, April 22, 2023 2:02 PM, Jeremy Morton wrote:
>>>>> Yes, I know Linus specifically doesn't store file rename info in Git.
>>>>> The trouble is, every now and then, I'll come across a situation
>>>>> where Git doesn't successfully detect that I've renamed a file
>>>>> because I'm doing something like renaming a class at the same time.
>>>>> So I'll have a file OldClassNameTests.cs and a NewClassNameTests.cs
>>>>> but a bunch of lines in that file have also changed from
>>>>> OldClassName.DoThing() to NewClassName.DoThing().  I can clearly
>>>>> see that this is a rename, but Git sees enough changed content that
>>>>> it doesn't realize it, and puts it in as a delete/add, losing the content history.
>>>>>
>>>>> The standard answer for this is to rename the file in one commit,
>>>>> then make the changes.  That's fine if you know ahead of time
>>>>> you'll want to do this.  However it's a total PITA if you have a
>>>>> bunch of changes and you realize that a rename has caused this
>>>>> problem.  You now have to back out your changes to the renamed
>>>>> file, add the rename, commit
>>> it, then re-apply the changes.
>>>>>
>>>>> Could a command be added to git that means you tell Git that counts
>>>>> as a file rename?  Git would add a marker to the staging area that
>>>>> the file has been renamed, and upon commit, would first generate an
>>>>> additional commit for each rename before generating the main
>>>>> commit, ensuring the rename operation counts as an actual rename,
>>>>> and the content's
>>> history is maintained.
>>>>
>>>> Would git mv work in your situation? You can stage changes to the
>>>> original file,
>>> then use git mv. Or use git mv first. The rename shows as staged in any event.
>>>> --Randall
>>>>
>>>>
>>
>>