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const objFilter = require('./obj-filter')
// validation-type-stuff, missing params,
// bad implications, custom checks.
module.exports = function (yargs, usage, y18n) {
const __ = y18n.__
const __n = y18n.__n
const self = {}
// validate appropriate # of non-option
// arguments were provided, i.e., '_'.
self.nonOptionCount = function (argv) {
const demanded = yargs.getDemanded()
// don't count currently executing commands
const _s = argv._.length - yargs.getContext().commands.length
if (demanded._ && (_s < demanded._.count || _s > demanded._.max)) {
if (demanded._.msg !== undefined) {
usage.fail(demanded._.msg)
} else if (_s < demanded._.count) {
usage.fail(
__('Not enough non-option arguments: got %s, need at least %s', _s, demanded._.count)
)
} else {
usage.fail(
__('Too many non-option arguments: got %s, maximum of %s', _s, demanded._.max)
)
}
}
}
// validate the appropriate # of <required>
// positional arguments were provided:
self.positionalCount = function (required, observed) {
if (observed < required) {
usage.fail(
__('Not enough non-option arguments: got %s, need at least %s', observed, required)
)
}
}
// make sure that any args that require an
// value (--foo=bar), have a value.
self.missingArgumentValue = function (argv) {
const defaultValues = [true, false, '']
const options = yargs.getOptions()
if (options.requiresArg.length > 0) {
const missingRequiredArgs = []
options.requiresArg.forEach(function (key) {
const value = argv[key]
// if a value is explicitly requested,
// flag argument as missing if it does not
// look like foo=bar was entered.
if (~defaultValues.indexOf(value) ||
(Array.isArray(value) && !value.length)) {
missingRequiredArgs.push(key)
}
})
if (missingRequiredArgs.length > 0) {
usage.fail(__n(
'Missing argument value: %s',
'Missing argument values: %s',
missingRequiredArgs.length,
missingRequiredArgs.join(', ')
))
}
}
}
// make sure all the required arguments are present.
self.requiredArguments = function (argv) {
const demanded = yargs.getDemanded()
var missing = null
Object.keys(demanded).forEach(function (key) {
if (!argv.hasOwnProperty(key)) {
missing = missing || {}
missing[key] = demanded[key]
}
})
if (missing) {
const customMsgs = []
Object.keys(missing).forEach(function (key) {
const msg = missing[key].msg
if (msg && customMsgs.indexOf(msg) < 0) {
customMsgs.push(msg)
}
})
const customMsg = customMsgs.length ? '\n' + customMsgs.join('\n') : ''
usage.fail(__n(
'Missing required argument: %s',
'Missing required arguments: %s',
Object.keys(missing).length,
Object.keys(missing).join(', ') + customMsg
))
}
}
// check for unknown arguments (strict-mode).
self.unknownArguments = function (argv, aliases) {
const aliasLookup = {}
const descriptions = usage.getDescriptions()
const demanded = yargs.getDemanded()
const commandKeys = yargs.getCommandInstance().getCommands()
const unknown = []
const currentContext = yargs.getContext()
Object.keys(aliases).forEach(function (key) {
aliases[key].forEach(function (alias) {
aliasLookup[alias] = key
})
})
Object.keys(argv).forEach(function (key) {
if (key !== '$0' && key !== '_' &&
!descriptions.hasOwnProperty(key) &&
!demanded.hasOwnProperty(key) &&
!aliasLookup.hasOwnProperty(key)) {
unknown.push(key)
}
})
if (commandKeys.length > 0) {
argv._.slice(currentContext.commands.length).forEach(function (key) {
if (commandKeys.indexOf(key) === -1) {
unknown.push(key)
}
})
}
if (unknown.length > 0) {
usage.fail(__n(
'Unknown argument: %s',
'Unknown arguments: %s',
unknown.length,
unknown.join(', ')
))
}
}
// validate arguments limited to enumerated choices
self.limitedChoices = function (argv) {
const options = yargs.getOptions()
const invalid = {}
if (!Object.keys(options.choices).length) return
Object.keys(argv).forEach(function (key) {
if (key !== '$0' && key !== '_' &&
options.choices.hasOwnProperty(key)) {
[].concat(argv[key]).forEach(function (value) {
// TODO case-insensitive configurability
if (options.choices[key].indexOf(value) === -1) {
invalid[key] = (invalid[key] || []).concat(value)
}
})
}
})
const invalidKeys = Object.keys(invalid)
if (!invalidKeys.length) return
var msg = __('Invalid values:')
invalidKeys.forEach(function (key) {
msg += '\n ' + __(
'Argument: %s, Given: %s, Choices: %s',
key,
usage.stringifiedValues(invalid[key]),
usage.stringifiedValues(options.choices[key])
)
})
usage.fail(msg)
}
// custom checks, added using the `check` option on yargs.
var checks = []
self.check = function (f) {
checks.push(f)
}
self.customChecks = function (argv, aliases) {
for (var i = 0, f; (f = checks[i]) !== undefined; i++) {
var result = null
try {
result = f(argv, aliases)
} catch (err) {
usage.fail(err.message ? err.message : err, err)
continue
}
if (!result) {
usage.fail(__('Argument check failed: %s', f.toString()))
} else if (typeof result === 'string' || result instanceof Error) {
usage.fail(result.toString(), result)
}
}
}
// check implications, argument foo implies => argument bar.
var implied = {}
self.implies = function (key, value) {
if (typeof key === 'object') {
Object.keys(key).forEach(function (k) {
self.implies(k, key[k])
})
} else {
implied[key] = value
}
}
self.getImplied = function () {
return implied
}
self.implications = function (argv) {
const implyFail = []
Object.keys(implied).forEach(function (key) {
var booleanNegation
if (yargs.getOptions().configuration['boolean-negation'] === false) {
booleanNegation = false
} else {
booleanNegation = true
}
var num
const origKey = key
var value = implied[key]
// convert string '1' to number 1
num = Number(key)
key = isNaN(num) ? key : num
if (typeof key === 'number') {
// check length of argv._
key = argv._.length >= key
} else if (key.match(/^--no-.+/) && booleanNegation) {
// check if key doesn't exist
key = key.match(/^--no-(.+)/)[1]
key = !argv[key]
} else {
// check if key exists
key = argv[key]
}
num = Number(value)
value = isNaN(num) ? value : num
if (typeof value === 'number') {
value = argv._.length >= value
} else if (value.match(/^--no-.+/) && booleanNegation) {
value = value.match(/^--no-(.+)/)[1]
value = !argv[value]
} else {
value = argv[value]
}
if (key && !value) {
implyFail.push(origKey)
}
})
if (implyFail.length) {
var msg = __('Implications failed:') + '\n'
implyFail.forEach(function (key) {
msg += (' ' + key + ' -> ' + implied[key])
})
usage.fail(msg)
}
}
self.recommendCommands = function (cmd, potentialCommands) {
const distance = require('./levenshtein')
const threshold = 3 // if it takes more than three edits, let's move on.
potentialCommands = potentialCommands.sort(function (a, b) { return b.length - a.length })
var recommended = null
var bestDistance = Infinity
for (var i = 0, candidate; (candidate = potentialCommands[i]) !== undefined; i++) {
var d = distance(cmd, candidate)
if (d <= threshold && d < bestDistance) {
bestDistance = d
recommended = candidate
}
}
if (recommended) usage.fail(__('Did you mean %s?', recommended))
}
self.reset = function (globalLookup) {
implied = objFilter(implied, function (k, v) {
return globalLookup[k]
})
checks = []
return self
}
var frozen
self.freeze = function () {
frozen = {}
frozen.implied = implied
frozen.checks = checks
}
self.unfreeze = function () {
implied = frozen.implied
checks = frozen.checks
frozen = undefined
}
return self
}