#!/usr/bin/env bash
#
# Updates the changelog and version in the package.json
# Will also create a commit with these changes locally
# Run `git commit --amend` after that if you wish to make changes
#
# Usage:
# ./changelog "7.0.0"
#
# Prerequisites:
# - On master branch
# - No uncommitted changes
#
# Dependencies:
# - git-extras https://github.com/tj/git-extras/blob/master/Installation.md

set -eo pipefail

# Checks if we are on the master branch
BRANCH=$(git rev-parse --abbrev-ref HEAD)
if [[ "$BRANCH" != 'master' ]]; then
  echo 'ERROR: not on master branch' >&2
  exit 1;
fi

# Checks if there are uncommitted changes
git diff-index --quiet HEAD -- || (echo 'ERROR: there are uncommitted changes' >&2 && exit 1)

VERSION="$1"

# Validates the $VERSION
SEMVER_REGEX='^([0-9]+\.){2}([0-9]+)$'
if ! [[ $VERSION =~ $SEMVER_REGEX ]]; then
 echo "ERROR: Version '$VERSION' is invalid " >&2
 exit 1
fi

# Change the version in the package.json
cat package.json | jq ".version = \"$VERSION\"" > package.json.tmp

# Workaround for inplace jq editing
mv package.json.tmp package.json

# Unset the editor so that git changelog does not open a editor
EDITOR=:
git changelog CHANGELOG.md --tag "$VERSION"

# Commit these changes
git add CHANGELOG.md
git add package.json
git commit -m "Update changelog for \`v$VERSION\`"