Further simplify `script/brew-publish`

#!/bin/bash

# Usage: script/brew-publish <name> <version> [<gh-project>]

#

# Updates the `<name>.rb` Homebrew formula to `<version>` and sends a pull

# request with the change.

set -e

# Usage: script/brew-publish <formula-name> <repo> <version>

set -euo pipefail

brew_name="${1?}"

version="${2?}"

if [ -n "$3" ]; then

  gh_project="github.com/${3}"

else

  gh_project="$(git remote -v | grep '^origin' | grep -oE 'github.com[:/][^/]+/[^/ ]+' | head -1)"

  gh_project="${gh_project%.git}"

fi

url="https://${gh_project/:/\/}/archive/${version}.tar.gz"

repo="${2?}"

version="${3?}"

shift 3

url="https://github.com/${repo}/archive/${version}.tar.gz"

checksum="$(curl -fsSL "$url" | shasum -a 256 -b | awk '{print $1}')"

if [ -z "$checksum" ]; then

  echo "ERROR: calculating the checksum failed for $url" >&2

  exit 1

fi

brew bump-formula-pr --url=$url --sha256=$checksum $brew_name

brew bump-formula-pr --url="$url" --sha256="$checksum" "$brew_name" "$@"

{ echo "ruby-build ${new_version}"

  echo

  git log --no-merges --format='%w(0,0,2)* %B' --reverse "${previous_tag}..HEAD^" -- bin share

} | hub release create -dF - -c "$(git rev-parse HEAD)" "$version_tag" || true

hub browse -- "releases/${version_tag}"

} | hub release create -dF - "$version_tag" || true

script/brew-publish ruby-build "$version_tag"

script/brew-publish ruby-build rbenv/ruby-build "$version_tag"