On 6/4/06, Junio C Hamano <junkio@xxxxxxx> wrote:
"Marco Costalba" <mcostalba@xxxxxxxxx> writes:
> As example given a selected revision with id <sha> is it possible to
> do something like this to fond the ancestor?
>
> 1) get the tag list with git-peek-remote or something similar if tags
> are not already loaded
>
> 2) given the tagList vector with n elements run
>
> git-rev-list --topo-order <sha> ^tagList[0] ^tagList[1] ....
> ^tagList[n-1]
>
> 3) take the last sha spit out by git-rev-list, be it <lastSha>.
>
> 4) Previous nearest tag is the parent of lastSha
Sorry, I do not understand what you are doing here at all.
Suppose you have this simple history.
(root)
a---b---d---e---f---g
t1 \ / t3
---c
t2
and <sha1> in (2) is "e". When tagList = (t1, t2, t3), the
above rev-list would return empty.
This is enough!
Empty list is an useful and enough information.
It means:
1) Parent of current revision ("e" in our case) is a tag, indeed our seeked tag.
2) If previous point is not true then there are no previous tags.
In a less corner case, just to better explaing my idea, consider this:
a---b---d---e---f---g---h
t1 \ / t3
---c
t2
Where our sha1 is still "e", in this case
git-rev-list --topo-order <e> ^a ^c ^g
gives, as last revision in output list, "f"
Then parentOf(<f>) is <g> and our looked for tag is t3
Marco
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