#!/bin/bash
set -eu

if [ $# -lt 1 ] ; then
STR="$(cat)"
else
echo "No options yet!"
exit 1
fi

# 1. Collect URL of the incoming repo
URL="$(echo "$STR" | sed -n -e '/^are available in the Git repository at:/,+2 {
s/[[:space:]]\+//
s/\(=[[:digit:]]\{2\}\)\+$//
/^\(http\|git\)/p
}')"

# 2. Check it is in our remotes
mapfile REMOTES < <(git remote -v|awk '{print $1,$2;}')
REMOTE=''
for rem in "${REMOTES[@]}" ; do
    if [[ ${rem} =~ $URL ]] ; then
        REMOTE="$(echo "${rem}" | awk -F ' ' '{print $1;}' )"
        break
    fi
done

# 3. Find the tip of the offered branch
END="$(echo "$STR" | awk '/^for you to fetch changes up to / { print $NF }' | sed -e 's/[=:]*$//')"

# 4. Fetch the remote
if [[ -n "$REMOTE" ]] ; then
    git fetch "$REMOTE" "$END"
else
    git fetch "$URL" "$END"
fi

# 5. open new branch
git checkout -B _4review FETCH_HEAD