Setup a repo pre-commit hook to use scalafmt

pre-commit

#!/bin/sh
# Licensed under CC0 in jurisdictions where this is not directly in the Public Domain
# Authored by Santiago Saavedra (github.com/ssaavedra)


git scalafmt --test || exit 1

# If there are whitespace errors, print the offending file names and fail.
exec git diff-index --check --cached $against --

setup-repo.sh

#!/bin/bash
# Licensed under CC0 in jurisdictions where this is not directly in the Public Domain
# Authored by Santiago Saavedra (github.com/ssaavedra)

scalafmt="$(git rev-parse --git-path bin/scalafmt)"

download-scalafmt () {
    if [[ -x "$scalafmt" ]]; then
	echo "scalafmt is already downloaded"
	return 0
    fi

    mkdir -p "$(git rev-parse --git-path bin)"

    if which scalafmt >/dev/null 2>&1; then
	echo "There is a scalafmt on the PATH. We will use that, but you can customize it at:"
	echo "$scalafmt"
	ln -s "$(which scalafmt)" "$scalafmt"
	return 0
    fi

    if [[ $(uname -s) == "Linux" && $(uname -i) == "x86_64" ]]; then
	echo "Downloading binary-image of scalafmt..."
	curl -L -o "$scalafmt" https://github.com/ssaavedra/scalafmt/releases/download/v1.6.0-RC4-graalvm1/scalafmt-1.6.0-rc4-graalvm1-linux-x86_64-stripped-static
    else
	echo "Could not find a binary scalafmt available for your platform. Falling back to using sbt scalafmtCheck"
	echo "#!/bin/bash\nexec sbt scalafmtCheck\n" > "$scalafmt"
    fi
    chmod +x "$scalafmt"
}

setup-hooks () {
    ln -fsv "$PWD/_git-hooks/pre-commit" "$(git rev-parse --git-path hooks/pre-commit)"
}

setup-config-alias () {
    git config --replace-all alias.scalafmt '! $(git rev-parse --git-path bin/scalafmt) -Xmn1g --git 1'
}

download-scalafmt
setup-hooks
setup-config-alias