#!/bin/sh

# Make all local branches match the remote branch they track,
# discarding local-only commits and, on the current branch,
# uncommitted changes as well
#
# Branches without an upstream are left alone
#
# Usage: git match-remote

set -eu


git fetch --all --prune


current="$(git branch --show-current)"


git for-each-ref --format='%(refname:short) %(upstream:short)' refs/heads/ |
while read -r branch upstream; do

    [ -n "$upstream" ] || continue

    git rev-parse --verify --quiet "$upstream" >/dev/null || continue

    if [ "$branch" = "$current" ]; then
        git reset --hard "$upstream"
        continue
    fi

    git branch -f "$branch" "$upstream"
    echo "Moved $branch to $upstream"

done