Simple version bumper using node-semver

bump-version.sh

#!/bin/bash

##
## Bumps semantic version using node-semver.
##
## Usage:
##   ./bump-version.sh <level> <file>
##
## <level> can be:  major, minor, patch,
##                  premajor, preminor,
##                  prepatch, prerelease
## Defaults to:  patch
##
## <file> is path to plain-text version file.
## Defaults to:  version
##

set -euo pipefail

alias semver=/usr/local/bin/semver

LEVEL=${1:-patch}
VERSION_FILE=${2:-version}

VERSION=$(cat "$VERSION_FILE")

set +e
semver "$VERSION" > /dev/null
if [ $? -ne 0 ]; then
    echo "Bad semver value: $VERSION"
    exit 1
fi
set -e

NEW_VERSION=$(semver -i "$LEVEL" "$VERSION")

echo "$NEW_VERSION" > "$VERSION_FILE"

echo "Bumped version:"
echo "    $VERSION -> $NEW_VERSION"