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2009-10-18"checkout A...B" switches to the merge base between A and BLibravatar Junio C Hamano1-1/+26
When flipping commits around on topic branches, I often end up doing this sequence: * Run "log --oneline next..jc/frotz" to find out the first commit on 'jc/frotz' branch not yet merged to 'next'; * Run "checkout $that_commit^" to detach HEAD to the parent of it; * Rebuild the series on top of that commit; and * "show-branch jc/frotz HEAD" and "diff jc/frotz HEAD" to verify. Introduce a new syntax to "git checkout" to name the commit to switch to, to make the first two steps easier. When the branch to switch to is specified as A...B (you can omit either A or B but not both, and HEAD is used instead of the omitted side), the merge base between these two commits are computed, and if there is one unique one, we detach the HEAD at that commit. With this, I can say "checkout next...jc/frotz". Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-01-19interpret_nth_last_branch(): avoid traversing the reflog twiceLibravatar Junio C Hamano1-0/+44
You can have quite a many reflog entries, but you typically won't recall which branch you were on after switching branches for more than several times. Instead of reading the reflog twice, this reads the branch switching event and keeps as many entries as the user asked from the latest such entries, which is the minimum required to be able to switch back to the branch we were recently on. [jc: improvements from Dscho squashed in] Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-01-17checkout: implement "-" abbreviation, add docs and testsLibravatar Thomas Rast1-0/+50
Have '-' mean the same as '@{-1}', i.e., the last branch we were on. Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>