#!/bin/bash

set -euo pipefail

main() {
    git remote --verbose | grep -qE "^upstream\s" \
        || git remote add upstream https://github.com/rust-lang/rust/

    git fetch --no-tags upstream

    local lastest_commit=$(cat upstream)
    local commits=$(git rev-list upstream/master ${lastest_commit}.. -- compiler/rustc_graphviz)

    if [ -z "$commits" ]
    then
        echo "Already up to date"
        return 0
    fi

    for commit in $commits
    do
        echo "Apply commit $commit"
        git format-patch -1 "$commit" --stdout -- compiler/rustc_graphviz | git am -p3
        echo "$commit" > upstream
    done
}

main