first commit

.gitignore

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+/node_modules/
+package-lock.json

.travis.yml

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+language: node_js
+node_js:
+  - "7"

README.md

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+# fx [![Build Status](https://travis-ci.org/antonmedv/fx.svg?branch=master)](https://travis-ci.org/antonmedv/fx)
+
+Command-line JSON processing tool
+
+## Features
+
+* Don't need to learn new syntax
+* Plain JavaScript
+* Formatting and highlighting
+
+## Install
+
+```
+$ npm install -g fx
+```
+
+## Usage
+
+Pipe into `fx` any JSON and anonymous function for reducing it.
+
+```
+$ fx [code ...]
+```
+
+Pretty print JSON:
+```
+$ echo '{"key":"value"}' | fx
+{
+    "key": "value"
+}
+```
+
+Use anonymous function:
+```
+$ echo '{"foo": [{"bar": "value"}]}' | fx "x => x.foo[0].bar"
+"value"
+```
+
+If you don't pass anonymous function `param => ...`, code will be automatically transformed into anonymous function.
+And you can get access to JSON by `this` keyword:
+```
+$ echo '{"foo": [{"bar": "value"}]}' | fx "this.foo[0].bar"
+"value"
+```
+
+You can pass any number of anonymous functions for reducing JSON:
+```
+$ echo '{"foo": [{"bar": "value"}]}' | fx "x => x.foo" "this[0]" "this.bar"
+"value"
+```
+
+If passed code contains `yield` keyword, [generator expression](https://github.com/sebmarkbage/ecmascript-generator-expression)
+will be used:
+```
+$ curl ... | fx "for (let user of this) if (user.login.startsWith('a')) yield user"
+```
+
+Access to JSON through `this` keyword:
+```
+$ echo '["a", "b"]' | fx "yield* this"
+[
+    "a",
+    "b"
+]
+```
+
+```
+$ echo '["a", "b"]' | fx "yield* this; yield 'c';"
+[
+    "a",
+    "b",
+    "c"
+]
+```
+
+You can update existing JSON using spread operator:
+
+```
+$ echo '{"count": 0}' | fx "{...this, count: 1}"
+{
+    "count": 1
+}
+```
+
+
+## Related
+
+* [jq](https://github.com/stedolan/jq) – cli JSON processor on C
+* [jsawk](https://github.com/micha/jsawk) – like awk, but for JSON
+* [json](https://github.com/trentm/json) – another JSON manipulating cli library
+
+## License
+
+MIT

index.js

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+#!/usr/bin/env node
+'use strict';
+const meow = require('meow')
+const stdin = require('get-stdin')
+const cardinal = require('cardinal')
+const theme = require('cardinal/themes/tomorrow-night')
+
+const cli = meow(`
+  Usage
+    $ fx [code ...]
+
+  Examples
+    $ echo '{"key": "value"}' | fx "x => x.key"
+    "value"
+
+    $ echo '[1,2,3]' | fx "this.map(x => x * 2)"
+    [2, 4, 6]
+
+    $ echo '{"items": ["one", "two"]}' | fx "this.items" "this[1]"
+    "two"
+
+    $ echo '{"count": 0}' | fx "{...this, count: 1}"
+    {"count": 1}
+`)
+
+
+
+const highlight = process.stdout.isTTY ? cardinal.highlight : x => x
+
+async function main() {
+  const text = await stdin()
+
+  if (text === '') {
+    cli.showHelp()
+  }
+
+  const json = JSON.parse(text)
+  const result = cli.input.reduce(reduce, json)
+
+  if (typeof result === 'undefined') {
+    console.log(undefined)
+  } else {
+    const text = JSON.stringify(result, null, 4)
+    console.log(highlight(text, {theme}))
+  }
+}
+
+function reduce(json, code) {
+  if (/^\w+\s*=>/.test(code)) {
+    const fx = eval(code)
+    return fx(json)
+  } else if (/yield/.test(code)) {
+    const fx = eval(`
+      function fn() {
+        const gen = (function*(){ 
+          ${code.replace(/\\\n/g, '')} 
+        }).call(this)
+        return [...gen]
+      }; fn
+    `)
+    return fx.call(json)
+  } else {
+    const fx = eval(`function fn() { return ${code} }; fn`)
+    return fx.call(json)
+  }
+}
+
+main()

package.json

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+{
+  "name": "fx",
+  "version": "0.0.0",
+  "description": "Command-line JSON processing tool",
+  "repository": "antonmedv/fx",
+  "author": "Anton Medvedev <anton@medv.io>",
+  "license": "MIT",
+  "bin": {
+    "fx": "index.js"
+  },
+  "files": [
+    "index.js"
+  ],
+  "scripts": {
+    "test": "bash test.sh"
+  },
+  "keywords": [
+    "json",
+    "cli"
+  ],
+  "engines": {
+    "node": ">=9"
+  },
+  "dependencies": {
+    "cardinal": "^1.0.0",
+    "get-stdin": "^5.0.1",
+    "meow": "^4.0.0"
+  }
+}

test.sh

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+#!/usr/bin/env bash
+set -euxo pipefail
+alias fx='node index.js'
+echo '[{"greeting": "hello world"}]' | fx
+echo '{"key": "value"}' | fx "x => x.key"
+echo '[1, 2, 3, 4, 5]' | fx "this.map(x => x * this.length)"
+echo '[1, 2, 3, 4, 5]' | fx "for (let i of this) if (i % 2 == 0) yield i"
+echo '{"items": ["foo", "bar"]}' | fx "this.items" "yield* this; yield 'baz'"