tree be6de693adb7e9b21e95e9409dc06a7d341d9133
parent 696acf45f9638b014c7132508de26d1a571c8a33
author Junio C Hamano <gitster@pobox.com> 1232352265 -0800
committer Junio C Hamano <gitster@pobox.com> 1232408121 -0800

interpret_nth_last_branch(): avoid traversing the reflog twice

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>