Re: How do I specify a revision for "git blame" by date?

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Jeff King <peff@xxxxxxxx> writes:

> But that still doesn't address the issue that (a) is not well-defined.
> Imagine I have this history:
>
>   A--B--C---G--H
>    \       /
>     D--E--F
>
> that is, two lines of development splitting at A and merging at H. And
> imagine the commit timestamps are (let's just refer to them as integers
> for the sake of simplicity, but they are representing days or seconds or
> whatever):
>
>   A(1)--B(2)--C(3)--G(7)--H(8)
>    \               /
>     D(2)--E(4)--F(6)
>
> What does it mean to ask for the commit at time=5?
> ...
> Git-blame expects you to give it a well-defined point (as it must, since
> it is a backwards walk down history showing what led to a particular set
> of content; it wouldn't make sense to feed it multiple starting points).
> You could do so by asking rev-list to walk the graph according to your
> requirements and feeding the result to blame, like:
>
>   # most recent on any line of development that is merged to HEAD
>   git blame `git rev-list -1 --until=5 HEAD`
>
>   # most recent on any line of development in the whole repo
>   git blame `git rev-list -1 --until=5 --all`
>
>   # most recent version on the first-parent; if you follow a
>   # topic-branch workflow and always merge up into "master", then this
>   # will blame what was on master at time=5
>   git blame `git rev-list -1 --until=5 --first-parent HEAD`

Very well explained.  Thanks.

The short answer to the question on "Subject:" line is "You don't".
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