Scan a list of assigns in nodejs

Question

My starting point is a file like so:

# Default environment to run the app locally.
# In production, the app will probably run on NginX,
# which will act as a reverse proxy
export NODE_ENV='development'
export APPNAME='gigsnet'
export DBHOST='192.168.1.13'
export DBNAME='gigsnet-development'
export IPADDRESS='localhost'
export PORT='8080'

This is a simple bash file that sets and exports some environment variables. I want some nodeJs scripts to use the same file to set the same variables. The idea is to require this file, and have process.env magically enriched.

So, I wrote this:

var fs = require('fs')
var p = require('path')

fs.readFileSync(p.join(__dirname, 'localEnv.sh')).toString().split('\n').forEach(line => {
  var tokens = line.split(' ')
  if (tokens[0] === 'export') {
    var [ name, value ] = tokens[1].split('=')
    process.env[name] = value.match(/["'](.*?)["']/)[1]
  }
})

Problems I have:

That first line is way too long for my own likings
The variable token could and should have a better name

Looks clunky.

How would you improve it?

I wrestled a bear once. · Accepted Answer · 2017-12-19 20:58:53Z

The fact that you're parsing BASH means you're probably not worried about portability, which means you probably don't need the path module since the directory separator will always be /. So, you can replace p.join(__dirname, 'localEnv.sh') with __dirname+'/localEnv.sh'
There's a module for reading stuff line by line already, no need to home-roll it.
This is a better regex because it takes escaped quotes into account: "(?:[^"\\]|\\.)*"|'(?:[^'\\]|\\.)*' see here.

require('readline').createInterface({
  input: require('fs').createReadStream(__dirname+'/localEnv.sh')
}).on('line', function (line) {
  var tokens = line.split(' ')
  if (tokens[0] === 'export') {
    var [ name, value ] = tokens[1].split('=')
    process.env[name] = value.match(/"(?:[^"\\]|\\.)*"|'(?:[^'\\]|\\.)*'/)[1]
  }
});

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