#!/bin/bash
#
# create a pull request for your branch
#

usage() {
    echo "Usage: "
    echo "$ $0 [-r <relative_to>] [-i <commit_id>] -b <contrib_branch>"
    echo "  <relative_to> is a commit identifier, like branch-name, HEAD, hex-commit-id"
    echo "  <commit_id> is a commit identifier, like branch-name, HEAD, hex-commit-id"
    echo "  <contrib_branch> is the branch-name in the git.pokylinux.org/poky-contrib tree"
    echo "  If <relative_to> is not specified then relative to master is assumed"
    echo "  If <commit_id> is not specified then it is assumed as HEAD"
    echo " For Example:"
    echo "   $0 -r master -i misc -b nitin/misc "
    echo "   $0 -b nitin/misc "
    echo "   $0 -r distro/master -i nitin/distro -b nitin/distro "
    exit 1
}

while [ $# -ne 0 ] # loop over arguments
do

    case $1 in
    -r )
        shift
        RELATIVE_TO=$1
        shift
        ;;
    -i )
        shift
        COMMIT_ID=$1
        shift
        ;;
    -b )
        shift
        CONTRIB_BRANCH=$1
        shift
        ;;
    *)
        usage
        ;;
    esac
done

if [ "${COMMIT_ID}" = "" ]; then
    COMMIT_ID=HEAD
    echo "Note: <commit_id> parameter assumed as 'HEAD'"
fi

if [ "${RELATIVE_TO}" = "" ]; then
    RELATIVE_TO=master
    echo "Note: <relative_to> parameter assumed as 'master'"
fi

if [ "${CONTRIB_BRANCH}" = "" ]; then
    echo "Error: Parameter <contrib_branch> not specified"
    usage
fi

git --no-pager show ${COMMIT_ID} > /dev/null
if [ "$?" != "0" ]; then
    echo "Error: Invalid <commit_id> parameter specified"
    usage
fi

git --no-pager show ${RELATIVE_TO} > /dev/null
if [ "$?" != "0" ]; then
    echo "Error: Invalid <relative_to> parameter specified: ${RELATIVE_TO}" 
    usage
fi

echo ""
git --no-pager diff ${RELATIVE_TO}..${COMMIT_ID} | diffstat -p1
echo ""
git --no-pager log --no-merges ${RELATIVE_TO}..${COMMIT_ID} | git --no-pager shortlog

PULL_URL="http://git.pokylinux.org/cgit.cgi/poky-contrib/log/?h=${CONTRIB_BRANCH}"

echo "Pull URL: ${PULL_URL}"

wget -q ${PULL_URL} -O - | grep -q "Invalid branch:\ ${CONTRIB_BRANCH}"
if [ "$?" == "0" ]; then
    echo "Warning: Branch named '${CONTRIB_BRANCH}' was not found on contrib git tree"
    echo "Check your <contrib-branch> parameter"
fi