Implement a basic CLI

Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

Author: jviotti

README.markdown

@@ -113,6 +113,23 @@ console.log(taxonomy(value))
 // [ 'tier 1', 'numeric', 'non-redundant', 'flat' ]
 ```
 
+Usage (CLI)
+-----------
+
+The published [npm](https://www.npmjs.com) package includes a simple
+command-line interface program that can be globally installed as follows:
+
+```sh
+npm install --global @sourcemeta/json-taxonomy
+```
+
+The CLI program takes the path to a JSON document as an argument and outputs
+the taxonomy to standard output:
+
+```sh
+json-taxonomy path/to/document.json
+```
+
 License
 -------
 

js/cli.js

@@ -0,0 +1,17 @@
+#!/usr/bin/env node
+
+const fs = require('fs')
+const taxonomy = require('..')
+const INPUT = process.argv[2]
+
+if (!INPUT) {
+  console.error(`${process.argv[0]} ${process.argv[1]} <document.json>`)
+  process.exit(1)
+}
+
+fs.accessSync(INPUT, fs.constants.R_OK)
+const value = JSON.parse(fs.readFileSync(INPUT, 'utf8'))
+
+console.log(taxonomy(value).map((qualifier) => {
+  return qualifier[0].toUpperCase() + qualifier.slice(1)
+}).join(', '))

package-lock.json

@@ -1,8 +1,11 @@
 {
   "name": "@sourcemeta/json-taxonomy",
-  "version": "1.0.1",
+  "version": "1.1.0",
   "description": "A formal taxonomy to classify JSON documents based on their size, type of content, characteristics of their structure and redundancy criteria",
   "main": "js/index.js",
+  "bin": {
+    "json-taxonomy": "./js/cli.js"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/sourcemeta/json-taxonomy.git"