Gradle util to extract a GitHub based dependency's hash from package.json

readHashedVersion.gradle

import groovy.json.JsonSlurper

def readHashedVersion(packagejson, packageName, section) {
    def packageSlurper = new JsonSlurper()
    def packageJson = packageSlurper.parse file(packagejson)
    def dep = packageJson.get(section).get(packageName)
    def hash = dep.substring(dep.lastIndexOf('#') + 1)
    return hash;
}

ext {
    readHashedVersion = this.&readHashedVersion
}