Support installing as an executable via npm.

README.md

@@ -4,6 +4,8 @@ A simple Node.JS application that uses REST APIs to update a Google calendar bas
 
 It was written for a very specific use case (that of a spreadsheet used to track availability of volunteers for a code club) so it's unlikely to be generally useful, but it can hopefully serve as a reference or starting-point for anyone looking to do something similar.
 
+## Developing ##
+
 ### Setup ###
 
 Run `npm install` to install dependencies.
@@ -13,41 +15,47 @@ Follow the linked instructions to enable both the [Google Calendar](https://deve
 Edit [environment.ts](src/environment/environment.ts) to configure the locations of your Google calendar and spreadsheet
 and other aspects of the application.
 
-Tested on node 10.3.0.
+Tested on node 10.15.3.
 
-### Run once ###
+### Running ###
 
 * `npm run start` - update the calendar with data from the spreadsheet
 * `npm run dry-run` - log the updates that would have been made, without actually making them
 
 The first time you run the application it will prompt you to visit a web site to authenticate - simply follow the instructions
 in the console.  The credentials are save to disk and re-used for future runs.
 
-### Run on a schedule ###
+## Installation ##
+
+Run `npm install -g` to install the application globally.  This will add a `google-sheets-calendar-connector` executable to the path.
+
+You can use the `TOKEN_DIR` environment variable to control where the API token is stored.
+
+### Running on a schedule ###
 
 The application does not provide support for scheduling - use an OS provided system such as `cron` (linux) or `launchd` (MacOS).
 
-### Docker ###
+## Docker ##
 
-##### Build #####
+#### Build ####
 
     docker build -t google-sheets-calendar-connector .
     docker volume create google-api-token
     docker create -i -v google-api-token:/var/token --name google-sheets-calendar-connector google-sheets-calendar-connector
 
-##### First run #####
+#### First run ####
 
     docker start -i google-sheets-calendar-connector
 
 Follow the instructions to authenticate and then press `Ctrl+D` to stop the container.
 
-##### Subsequent runs #####
+#### Subsequent runs ####
 
     docker start google-sheets-calendar-connector
 
 The application will run once and the container will stop  on completion.
 
-### Licensing
+## Licensing
 
 Portions of this code were taken from https://developers.google.com/google-apps/calendar/quickstart/nodejs,
 licensed under the Apache 2.0 License (http://www.apache.org/licenses/LICENSE-2.0).

index.js

@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+require('./dist/app/cli.js')

package.json

@@ -2,7 +2,10 @@
   "name": "google-sheets-calendar-connector",
   "version": "1.0.2",
   "description": "Updates a Google calendar with events from a Google sheet.",
-  "main": "calendar.js",
+  "main": "cli.js",
+  "bin": {
+    "google-sheets-calendar-connector": "./index.js"
+  },
   "dependencies": {
     "@types/backoff": "^2.5.0",
     "@types/moment": "^2.13.0",