New feature: Add a way to specify boolean value as an argument about command-line-args

[75lb]

Hi, could you post an example so I can more accurately visualise what you're trying to achieve? Something like this?

$ example file1.txt file2.txt --terms-accepted true

It would be very useful if one was able to configure command-line-args so that a Boolean option can take it's value as an argument, just like a String option.

If a boolean flag option requires an argument then it's no longer a boolean flag option. Could you define an option which accepts an input argument and then process the result with a custom function? Something like..

const commandLineArgs = require('command-line-args')

function activeDecision (userInput) {
  return userInput === 'true' || userInput === 'yes'
}

const optionDefinitions = [
  { name: 'accept-terms', type: activeDecision }
]

const options = commandLineArgs(optionDefinitions, { camelCase: true })
console.log('activeDecision result:', options.acceptTerms)

if (options.acceptTerms) {
  console.log('Thanks for accepting the terms.')
} else {
  console.log('Please accept the terms to continue.')
}

Example usage:

$ node active-decision.js
activeDecision result: undefined
Please accept the terms to continue.

$ node active-decision.js --accept-terms
activeDecision result: null
Please accept the terms to continue.

$ node active-decision.js --accept-terms no
activeDecision result: false
Please accept the terms to continue.

$ node active-decision.js --accept-terms yes
activeDecision result: true
Thanks for accepting the terms.

$ node active-decision.js --accept-terms true
activeDecision result: true
Thanks for accepting the terms.

[jihu]

This feature would also make it possible to have a Boolean option to be required. That is currently impossible.

The use case for having a required boolean could be that one want's to force the user to make an active decision, ie yes/no, true/false. But since the user can't actively choose 'false' then this can't be done currently.