bump-package-version.sh

LABEL="$1"

# @latest version on npm
latestVersionNPM=$(npm show . dist-tags.latest --json)
echo "Latest dist-tag version on npm: $latestVersionNPM"

# Initial package.json version
initialPackageJSON=$(sed -nE 's/^\s*"version": "([0-9]+.[0-9]+.[0-9]+).*?",$/\1/p' package.json)
echo "Initial package.json version: $initialPackageJSON"

# Set package.json to @latest version on npm
sed -i 's/\("version": \)\("[0-9]\+.[0-9]\+.[0-9]\+"\)/\1\'$latestVersionNPM'/' package.json
echo "Updated local package.json: $latestVersionNPM"

# Bump the package.json version, accordingly to the label.
case "$LABEL" in
    *"major"*)
        echo "Bumping pre-major version"
        echo "$(npm version --no-git-tag-version premajor --preid alpha)"
        ;;
    *"minor"*)
        echo "Bumping pre-minor version"
        echo "$(npm version --no-git-tag-version preminor --preid alpha)"
        ;;
    *"patch"*)
        echo "Bumping pre-patch version"
        echo "$(npm version --no-git-tag-version prepatch --preid alpha)"
        ;;
    *)
        echo "No [major, minor, patch] label has been set"
        exit 1
        ;;
esac

# Bumped package.json version
bumpedPackageJSONVersion=$(sed -nE 's/^\s*"version": "([0-9]+.[0-9]+.[0-9]+).*?",$/\1/p' package.json)

# Get all published versions on npm.
allVersionsArray=$(npm show . versions)

# Get the current version from the package.json
upToDatePackageJSON=$(sed -nE 's/^\s*"version": "([0-9]+.[0-9]+.[0-9]+).*?",$/\1/p' package.json)

# Identify the latest published alpha (if any) on npm, of the upToDatePackageJSON.
for i in ${allVersionsArray[@]}
do
    if [[ $i == *$upToDatePackageJSON* ]]; then
        latestAlphaVersion=$(echo $i)
    fi
done

# Get the alpha counter value of the latest alpha version (for the upToDatePackageJSON version).
alphaVersionCounter="$(echo "$latestAlphaVersion" | grep -oP '(?:-alpha.)\K\d+')"

# Bumping the alphaVersionCounter by 1.
if [[ "$alphaVersionCounter" != "" ]];
    then
        alphaVersionCounter="$((alphaVersionCounter+1))"
    else
        alphaVersionCounter="0"
fi

# Set alpha tag to the correspondent version
echo "Setting alpha version to $alphaVersionCounter"
sed -i 's/\("version": "[0-9]\+.[0-9]\+.[0-9]\+\)\(-alpha.\)\([0-9]\)/\1\'-alpha.$alphaVersionCounter'/' package.json

# If there was a version bump, commit changes with [skip ci]
if [[ "$initialPackageJSON" != "$upToDatePackageJSON" ]];
    then
        git add package.json
        git commit -m "Version autobumped to $upToDatePackageJSON [skip ci]"
fi