Short index for TLDR project

index.json

{
  "commands": [
    {
      "name": "ab",
      "platform": [
        "common"
      ]
    },
    {
      "name": "ack",
      "platform": [
        "common"
      ]
    },
    {
      "name": "ag",
      "platform": [
        "common"
      ]
    },
    {
      "name": "airport",
      "platform": [
        "osx"
      ]
    },
    {
      "name": "alias",
      "platform": [
        "common"
      ]
    },
    {
      "name": "apropos",
      "platform": [
        "common"
      ]
    },
    {
      "name": "apt-get",
      "platform": [
        "linux"
      ]
    },
    {
      "name": "aptitude",
      "platform": [
        "linux"
      ]
    }
  ]
}

shortIndex.json

{
  "ab": [
    "common"
  ],
  "ack": [
    "common"
  ],
  "ag": [
    "common"
  ],
  "airport": [
    "osx"
  ],
  "alias": [
    "common"
  ],
  "apropos": [
    "common"
  ],
  "apt-get": [
    "linux"
  ],
  "aptitude": [
    "linux"
  ]
}

transform.js

var _ = require('lodash');
var fs = require('fs');

var indexContent = fs.readFileSync('assets/index.json');
var index = JSON.parse(indexContent).commands;

var shortIndex = _.zipObject(
  _.map(index, 'name'),
  _.map(index, 'platform'));

console.log(JSON.stringify(shortIndex));