#!/bin/bash
set -e

WORK_DIR=`mktemp -d`

# deletes the temp directory
function cleanup {
  cd $HOME
  rm -rf "$WORK_DIR"
}

trap cleanup EXIT

# clone ModernFix repo

echo "downloading temporary modernfix..."
cd $WORK_DIR
git clone https://github.com/embeddedt/ModernFix mfix &>/dev/null
cd mfix

# gather version list
readarray -t all_versions < <(git ls-remote --heads origin | awk '{print $2}' | sed 's:.*/::' | sort -V)
echo "found versions: ${all_versions[@]}"

# checkout base version
git checkout -b propagations/${all_versions[0]} origin/${all_versions[0]} &>/dev/null

our_version=${all_versions[0]}
restore_version=$our_version

for version in "${all_versions[@]}"; do
    if ! { echo "$version"; echo "$our_version"; } | sort --version-sort --check &>/dev/null; then
        echo -n "merging $our_version into ${version}... "
        git checkout -b propagations/$version origin/$version &>/dev/null
        if git merge -m "Merge $our_version into $version" propagations/$our_version >/dev/null; then
            echo "done"
            git push -u origin propagations/$version:$version &>/dev/null
        else
            echo "failed, this merge must be done manually"
            exit 1
        fi
        our_version=$version
    fi
done