publish.js

#!/usr/bin/env nscript
/* To run this script, nscript is needed: [sudo] npm install -g nscript
/* Publish.js, publish a new version of the npm package as found in the current directory */
module.exports = function(shell, npm, git) {
    npm("test")
    npm("run", "_prepublish")

    var pkg = JSON.parse(shell.read("package.json"))
    npm("run", "build")

    // Bump version number
    var nrs = pkg.version.split(".")
    nrs[2] = 1 + parseInt(nrs[2], 10)
    var version = (pkg.version = shell.prompt(
        "Please specify the new package version of '" + pkg.name + "' (Ctrl^C to abort)",
        nrs.join(".")
    ))
    if (!version.match(/^\d+\.\d+\.\d+$/)) shell.exit(1, "Invalid semantic version: " + version)

    // Check registery data
    if (npm.silent().test("info", pkg.name)) {
        //package is registered in npm?
        var publishedPackageInfo = JSON.parse(npm.get("info", pkg.name, "--json"))
        if (publishedPackageInfo.versions == version || publishedPackageInfo.versions.indexOf(version) != -1)
            shell.exit(2, "Version " + pkg.version + " is already published to npm")

        shell.write("package.json", JSON.stringify(pkg, null, 2))

        // Finally, commit and publish!
        npm("publish")
        git("commit", "-am", "Published version " + version)
        git("tag", version)

        git("push")
        git("push", "--tags")
        console.log("Published!")
    } else shell.exit(1, pkg.name + " is not an existing npm package")
}