#!/bin/bash
#
# Yank a given commit out of the current branch
#

if [ "$#" -ne 1 ]; then
        echo "Usage: stable yank <commit sha1>"
        exit 1
fi

# Grab the commit sha1 for the commits before and after the commit we want
# to yank out, we'll just move them together to yank out the commit we want
# to remove.
location=$(git log --pretty="%H" | grep -m1 -C1 $1)
if [ "$location" = "" ]; then
	return
fi

after=$(echo $location | awk {'print $1'})
before=$(echo $location | awk {'print $3'})

# Topmost commit?
if [ "$before" = "" ]; then
	git reset --hard HEAD^
	exit
fi

git rebase -r --onto $before $after^