Re: using rev-list to tell if a branch is behind or ahead

> Tim Harper <timcharper@gmail.com> wrote:
>> I'm implementing a ruby interface to git and am wanting to be able to
>> ask if a branch is ahead or behind.
>>
>> I looked in the builtin-checkout.c file and see this code:
>>
>> /* Run "rev-list --left-right ours...theirs" internally... */
> ...
>> It looks like it's calling rev-parse.  But, when I call it with the
>> same arguments (using branches or commit sha1's), it only will list
>> commits that are in right and not in left.  I need it to show both
>> ways: commits that are in the right and not in left, and commits that
>> are in the left but not in right.
>>
>> Do I need to call rev-parse twice to achieve this?
>
> No.  You need to use the triple dot operator ("...") not the
> double dot operator ("..").
>

>> Here's a sample of what I'm trying currently:
>> ~ $ mkdir test
>> ~ $ cd test/
>> ~/test $ git init
>> Initialized empty Git repository in .git/
>> ~/test $ git
>> ~/test $ echo content > file.txt
>> ~/test $ git add file.txt && git commit -m "Initial commit"
>> Created initial commit f5e4160: Initial commit
>> 1 files changed, 1 insertions(+), 0 deletions(-)
>> create mode 100644 file.txt
>> ~/test master$ git co -b task
>> Switched to a new branch "task"
>> ~/test task$ echo changes >> file.txt
>> ~/test task$ git add file.txt && git commit -m "Some changes"
>> Created commit 96492ee: Some changes
>> 1 files changed, 1 insertions(+), 0 deletions(-)
>> ~/test task$ git rev-list --left-right task..master --
>
> You need an extra "." between task and master, this should be:
>
> git rev-list --left-right task...master --
>
>> ~/test task$ git rev-list --left-right master..task --
>>> 96492ee80143f43417b00699ff29330d0027df7f
>
> -- 
> Shawn.