How to split file with its history?

[k0st1x]

currently we have one code file with deep history.
As code file grown it is necessary to split it.
but this action will drop history for the new extracted file.
how can i split one big code file to small files and save its history for the "blame" action?

or guide me where i should post this question?

[rimrul]

AFAIK, you can't.

There is one thing you can do though:

Let's say you split your file main.c into a part1.c and a part2.c.

At some point you run git blame on part2.c. You find the line(s) you're interested in and see that ist was introduced in 54de6ab "split main.c in two parts". You then checkout 54de6ab~1 and run git blame on main.c and see where your line(s) where introduced.

[k0st1x]

rimrul, thank you for suggestion.
but is there any way to get official answer from git dev team?
is there exist technical limitation for git?
i asked here because https://github.com/git/git repo has no "issues" tab :(

[rimrul]

is there any way to get official answer from git dev team?

i asked here because https://github.com/git/git repo has no "issues" tab :(

Yes, the git project works exclusively via mailing list git@vger.kernel.org (text-only mails, HTML gets automatically rejected). You can send a mail, but they'll likely tell you the same thing.

is there exist technical limitation for git?

git blame works on the change history of the file, but the history of the split file doesn't start until you split the main file.

[k0st1x]

rimrul, thank you for detailed response