Allow PIDUSAGE_USE_PS to have string type of "true" (#141)

Author: basiam

index.js

@@ -22,7 +22,7 @@ function pidusage (pids, options, callback) {
  }
 
  options = Object.assign({
- usePs: process.env.PIDUSAGE_USE_PS,
+ usePs: /^true$/i.test(process.env.PIDUSAGE_USE_PS),
  maxage: process.env.PIDUSAGE_MAXAGE
  }, options)
 

test/ps.js

@@ -158,11 +158,11 @@ test('should be able to set usePs from env var', async t => {
  let usePsFromStats
 
  mockery.registerMock('./lib/stats', (_, options) => {
- usePsFromStats = !!options.usePs
+ usePsFromStats = options.usePs
  })
 
  const beforeValue = process.env.PIDUSAGE_USE_PS
- process.env.PIDUSAGE_USE_PS = '1'
+ process.env.PIDUSAGE_USE_PS = 'true'
 
  const pidusage = require('../')
  pidusage(1, () => {})