On Aug 18, 2008, at 9:37 AM, Thomas Harning wrote:
On Aug 18, 2008, at 12:41 AM, Junio C Hamano wrote:
If you have bunch of commits A B C D E F and if you would want to
know
which one of them is reachable from X, you could of course run
merge-base
once for each of A..F. Another way to do this would be to run:
git rev-list A B C D E F ^X
and look at the output. The ones among A..F that appear in the
output are
not reachable from X. The ones that are reachable from X do not
appear in
the output.
This is because "rev-list" outputs everything reachable from the
given
commits without ^ prefix, excluding the ones that are reacahble
from the
ones prefixed with ^.
Perfect! Now... is there built-in way to invert this to list those
that 'are' reachable..... Or would the inverse really end up
calculating the difference between input list and output list?
Hmm... looking at this, git rev-list will also spit out tons of
'unimportant' commits so bulk handling could be messy.
Given the following general feature/function specifications.. perhaps
new functionality to git needs to be coded.... or somehow external
code linking into git needs to be coded (best way to do this?...)
1) Given list of X references, which are in the ancestry of Y?
2) Given list of X references, which are in the ancestry of set Y
references? (multi-map X->Y)
3) Given reference X, which of set Y are descendants?
Example tree:
B--o--F
/
A--o--O--C--o--o
\ \
D--o--o--E
1) X = (A B C D E F)
Y = F
OUTPUT: A B F
Y = E
OUTPUT: A C D E
2) X = (A B C D E F)
Y = (A B C D E F)
OUTPUT:
A->A
B->A, B
C->A, C
D->A, D
E->A, C, D, E
F->A, B, F
3) X = A
Y = (A B C D E F)
OUTPUT:
A B C D E F
X = C
OUTPUT:
C E
It looks like one could calculate these using git rev-list.. but the
path list could either get quite full of items to handle..
You could also calculate M*N git rev-list/merge-base to check
ancestry/decendency...
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