feat: add basic cli (#206)

Co-authored-by: Brett Zamir <brettz9@yahoo.com>

README.md

@@ -368,6 +368,10 @@ from 0), whereas in XPath, they are 1-based.
 1. In JSONPath, equality tests utilize (as per JavaScript) multiple equal signs
 whereas in XPath, they use a single equal sign.
 
+## Command line interface
+
+A basic command line interface (CLI) is provided. Access it using `npx jsonpath-plus <json-file> <jsonpath-query>`.
+
 ## Ideas
 
 1. Support OR outside of filters (as in XPath `|`) and grouping.
@@ -396,3 +400,4 @@ npm run browser-test
 ## License
 
 [MIT License](https://opensource.org/license/mit/).
+

bin/jsonpath-cli.js

@@ -0,0 +1,36 @@
+#!/usr/bin/env node
+import {readFile} from 'fs/promises';
+import {JSONPath as jsonpath} from '../dist/index-node-esm.js';
+
+const file = process.argv[2];
+const path = process.argv[3];
+
+try {
+    const json = JSON.parse(await readFile(file, 'utf8'));
+    runQuery(json, path);
+} catch (e) {
+    /* eslint-disable no-console -- CLI */
+    console.error(`usage: ${process.argv[1]} <file> <path>\n`);
+    console.error(e);
+    /* eslint-enable no-console -- CLI */
+    process.exit(1);
+}
+
+/**
+ * @typedef {any} JSON
+ */
+
+/**
+ * @param {JSON} json
+ * @param {string} pth
+ * @returns {void}
+ */
+function runQuery (json, pth) {
+    const result = jsonpath({
+        json,
+        path: pth
+    });
+
+    // eslint-disable-next-line no-console -- CLI
+    console.log(result);
+}

package.json

@@ -3,6 +3,10 @@
   "name": "jsonpath-plus",
   "version": "8.0.0",
   "type": "module",
+  "bin": {
+    "jsonpath": "./bin/jsonpath-cli.js",
+    "jsonpath-plus": "./bin/jsonpath-cli.js"
+  },
   "main": "dist/index-node-cjs.cjs",
   "exports": {
     "./package.json": "./package.json",
@@ -137,6 +141,7 @@
     "node-import-test": "node --experimental-modules demo/node-import-test.mjs",
     "open": "open-cli http://localhost:8084/demo/ && npm start",
     "start": "http-server -p 8084",
+    "cli": "./bin/jsonpath-cli.js package.json name",
     "typescript": "tsc -p src",
     "mocha": "mocha --require test-helpers/node-env.js --reporter-options configFile=mocha-multi-reporters.json test",
     "c8": "rm -Rf ./coverage && rm -Rf ./node_modules/.cache && c8 --all npm run mocha && npm run coverage-badge",

rollup.config.js

@@ -42,7 +42,7 @@ function getRollupObject ({
             babel({
                 babelrc: false,
                 presets: [
-                    environment === 'node'
+                    environment === 'node' || environment === 'cli'
                         ? ['@babel/preset-env', {
                             targets: [
                                 `node ${pkg.engines.node}`
@@ -90,6 +90,11 @@ function getRollupObjectByEnv ({minifying, environment}) {
 export default [
     ...getRollupObjectByEnv({minifying: false, environment: 'node'}),
     // ...getRollupObjectByEnv({minifying: true, environment: 'node'}),
+    // getRollupObject({
+    //     input: 'bin/jsonpath-cli.js', format: 'esm',
+    //     minifying: false, environment: 'cli',
+    //     external: ['fs/promises', 'vm']
+    // }),
     ...getRollupObjectByEnv({minifying: false, environment: 'browser'}),
     ...getRollupObjectByEnv({minifying: true, environment: 'browser'})
 ];