#!/usr/bin/env bash

# Unoffical Bash "strict mode"
# http://redsymbol.net/articles/unofficial-bash-strict-mode/
set -euo pipefail
#ORIGINAL_IFS=$IFS
IFS=$'\t\n' # Stricter IFS settings

usage() {
    cat <<EOF

Usage: release.sh [new version]

This script is only intended for use by asdf maintainers when releasing new
versions of asdf. Plugin developers and asdf users do not need this script.

This script updates the hardcoded versions in the source code and README and
then commits them on the current branch. It then tags that commit with the
specified version.

EOF
}

error_exit() {
    usage
    exit 1
}

new_version="${1:-}"
new_tag_name="v$new_version"

# Make sure the user provides a version
if [[ -z "$new_version" ]]
then
    echo "ERROR: no new version specified"
    error_exit
fi

# Make sure version passed in is a plain semantic version to guard against
# leading 'v'.
if ! [[ "${new_version:0:1}" =~ ^[0-9]+$ ]]; then
    echo >&2 "ERROR: semantic version should not start with a letter"
    error_exit
fi

# Make sure the version the user provided hasn't already been tagged
if git tag | grep "$new_tag_name" > /dev/null; then
    echo >&2 "ERROR: git tag with that version already exists"
    exit 1
fi

echo "INFO: Checking that all changes are commited and pushed"
git pull

# Disallow unstaged changes in the working tree
if ! git diff-files --check --exit-code --ignore-submodules -- >&2; then
    echo >&2 "ERROR: You have unstaged changes."
    exit 1
fi

# Disallow uncommitted changes in the index
if ! git diff-index --cached --exit-code -r --ignore-submodules HEAD -- >&2; then
    echo >&2 "ERROR: Your index contains uncommitted changes."
    exit 1
fi

# Update version in README
sed -i.bak "s|^\(git clone.*--branch \).*$|\1$new_tag_name|" README.md

# Update version in utils.sh
# TODO: Hardcode version until.sh since not all asdf will include the Git repo

echo "INFO: Committing and tagging new version"

# Commit the changed files before tagging the new release
git add README.md
git add lib/utils.sh
git commit -m "Update version to $new_version"

git tag -a "$new_tag_name" -m "Version ${new_version}"

echo "INFO: done."
echo "INFO: Now you can push this local branch to the GitHub repository."