mangogrep/bin/mangogrep.bin.js

A tool to filter stdin containing a stream of JSON with a CouchDB mango selector

#!/usr/bin/env node

import { parseArgs } from 'node:util'
import path from 'node:path'
import { readFileSync } from 'node:fs'
import * as mangogrep from '../index.js'

const egSelector = '{"name":"Bob","date":{"$gt":"2022-01-01"}}'
const syntax = 
`Syntax:
--selector/-s            Mango selector e.g. ${egSelector}
--debug                  Output selector to stderr (default: false)
--version/v              Show app version  (default: false)
`
const app = JSON.parse(readFileSync(path.join(import.meta.dirname, '..', 'package.json'), { encoding: 'utf8' }))
const argv = process.argv.slice(2)
const options = {
  selector: {
    type: 'string',
    short: 's'
  },
  where: {
    type: 'string',
    short: 'w'
  },
  debug: {
    type: 'boolean',
    short: 'd',
    default: false
  },
  version: {
    type: 'boolean',
    short: 'v',
    default: false
  },
  help: {
    type: 'boolean',
    short: 'h',
    default: false
  }
}
const { values } = parseArgs({ argv, options })

// version mode
if (values.version) {
  console.log(`${app.name} ${app.version}`)
  process.exit(0)
}

// help mode
if (values.help) {
  console.log(syntax)
  process.exit(0)
}

// start the snapshot
mangogrep.start(values).catch((e) => { console.error(e.toString())})