Re: [GSoC] Interest in "More Sparse Index Integrations" project idea

[Shaoxuan Yuan <shaoxuan.yuan02@gmail.com>]

On Tue, Feb 15, 2022 at 2:45 AM Philippe Blain
<levraiphilippeblain@gmail.com> wrote:
> Or even better (you do not have to guess the number of commits in
> each series):
>
> git log --oneline --graph 3c0e4178277^-
>
> (see [1]). Why that syntax seems to completely ignore '--graph',
> though is beyond me!

I read the [1] and this "<rev>^-" syntax seems to exclude the first
parent of <rev>.
In another word, it only gets the part of history within the checked-out
new branch, i.e. "This is typically useful for merge commits where you
can just pass <commit>^- to get all the commits in the branch that was
merged in merge commit <commit> (including <commit> itself)."

It seems that the checked-out branch has a linear clean history,
and that's why it looks like "completely ignore '--graph'". Actually, it does
not ignore "--graph", e.g.

with "--graph":

* 3c0e417827 Merge branch 'ds/fetch-pull-with-sparse-index'
* 408c51f0b4 test-read-cache: remove --table, --expand options
* c2a2940510 t1091/t3705: remove 'test-tool read-cache --table'
* 3a9a6ac5d9 t1092: replace 'read-cache --table' with 'ls-files --sparse'
* 78087097b8 ls-files: add --sparse option
* 5a4e0547e2 fetch/pull: use the sparse index

w/out "--graph":

3c0e417827 Merge branch 'ds/fetch-pull-with-sparse-index'
408c51f0b4 test-read-cache: remove --table, --expand options
c2a2940510 t1091/t3705: remove 'test-tool read-cache --table'
3a9a6ac5d9 t1092: replace 'read-cache --table' with 'ls-files --sparse'
78087097b8 ls-files: add --sparse option
5a4e0547e2 fetch/pull: use the sparse index

Look at the asterisks prefixing every commit in the with "--graph" part.
If you init a new repo and add a few commits to form a linear history,
you will get a similar result by "git log --oneline --graph".

> [1] https://git-scm.com/docs/gitrevisions#Documentation/gitrevisions.txt-emltrevgt-ltngtemegemHEAD-HEAD-2em

-- 
Thanks & Regards,
Shaoxuan