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JavaScript

// fancy-pants parsing of argv, originally forked
// from minimist: https://www.npmjs.com/package/minimist
var camelCase = require('camelcase'),
path = require('path')
function increment (orig) {
return orig !== undefined ? orig + 1 : 0
}
module.exports = function (args, opts) {
if (!opts) opts = {}
var flags = { arrays: {}, bools: {}, strings: {}, counts: {}, normalize: {}, configs: {} }
;[].concat(opts['array']).filter(Boolean).forEach(function (key) {
flags.arrays[key] = true
})
;[].concat(opts['boolean']).filter(Boolean).forEach(function (key) {
flags.bools[key] = true
})
;[].concat(opts.string).filter(Boolean).forEach(function (key) {
flags.strings[key] = true
})
;[].concat(opts.count).filter(Boolean).forEach(function (key) {
flags.counts[key] = true
})
;[].concat(opts.normalize).filter(Boolean).forEach(function (key) {
flags.normalize[key] = true
})
;[].concat(opts.config).filter(Boolean).forEach(function (key) {
flags.configs[key] = true
})
var aliases = {},
newAliases = {}
extendAliases(opts.key)
extendAliases(opts.alias)
var defaults = opts['default'] || {}
Object.keys(defaults).forEach(function (key) {
if (/-/.test(key) && !opts.alias[key]) {
aliases[key] = aliases[key] || []
}
(aliases[key] || []).forEach(function (alias) {
defaults[alias] = defaults[key]
})
})
var argv = { _: [] }
Object.keys(flags.bools).forEach(function (key) {
setArg(key, !(key in defaults) ? false : defaults[key])
})
var notFlags = []
if (args.indexOf('--') !== -1) {
notFlags = args.slice(args.indexOf('--') + 1)
args = args.slice(0, args.indexOf('--'))
}
for (var i = 0; i < args.length; i++) {
var arg = args[i],
broken,
key,
letters,
m,
next,
value
// -- seperated by =
if (arg.match(/^--.+=/)) {
// Using [\s\S] instead of . because js doesn't support the
// 'dotall' regex modifier. See:
// http://stackoverflow.com/a/1068308/13216
m = arg.match(/^--([^=]+)=([\s\S]*)$/)
// nargs format = '--f=monkey washing cat'
if (checkAllAliases(m[1], opts.narg)) {
args.splice(i + 1, m[1], m[2])
i = eatNargs(i, m[1], args)
// arrays format = '--f=a b c'
} else if (checkAllAliases(m[1], flags.arrays) && args.length > i + 1) {
args.splice(i + 1, m[1], m[2])
i = eatArray(i, m[1], args)
} else {
setArg(m[1], m[2])
}
} else if (arg.match(/^--no-.+/)) {
key = arg.match(/^--no-(.+)/)[1]
setArg(key, false)
// -- seperated by space.
} else if (arg.match(/^--.+/)) {
key = arg.match(/^--(.+)/)[1]
// nargs format = '--foo a b c'
if (checkAllAliases(key, opts.narg)) {
i = eatNargs(i, key, args)
// array format = '--foo a b c'
} else if (checkAllAliases(key, flags.arrays) && args.length > i + 1) {
i = eatArray(i, key, args)
} else {
next = args[i + 1]
if (next !== undefined && !next.match(/^-/)
&& !checkAllAliases(key, flags.bools)
&& !checkAllAliases(key, flags.counts)) {
setArg(key, next)
i++
} else if (/^(true|false)$/.test(next)) {
setArg(key, next)
i++
} else {
setArg(key, defaultForType(guessType(key, flags)))
}
}
// dot-notation flag seperated by '='.
} else if (arg.match(/^-.\..+=/)) {
m = arg.match(/^-([^=]+)=([\s\S]*)$/)
setArg(m[1], m[2])
// dot-notation flag seperated by space.
} else if (arg.match(/^-.\..+/)) {
next = args[i + 1]
key = arg.match(/^-(.\..+)/)[1]
if (next !== undefined && !next.match(/^-/)
&& !checkAllAliases(key, flags.bools)
&& !checkAllAliases(key, flags.counts)) {
setArg(key, next)
i++
} else {
setArg(key, defaultForType(guessType(key, flags)))
}
} else if (arg.match(/^-[^-]+/)) {
letters = arg.slice(1, -1).split('')
broken = false
for (var j = 0; j < letters.length; j++) {
next = arg.slice(j + 2)
if (letters[j + 1] && letters[j + 1] === '=') {
value = arg.slice(j + 3)
key = letters[j]
// nargs format = '-f=monkey washing cat'
if (checkAllAliases(letters[j], opts.narg)) {
args.splice(i + 1, 0, value)
i = eatNargs(i, key, args)
// array format = '-f=a b c'
} else if (checkAllAliases(key, flags.arrays) && args.length > i + 1) {
args.splice(i + 1, 0, value)
i = eatArray(i, key, args)
} else {
setArg(key, value)
}
broken = true
break
}
if (next === '-') {
setArg(letters[j], next)
continue
}
if (/[A-Za-z]/.test(letters[j])
&& /-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) {
setArg(letters[j], next)
broken = true
break
}
if (letters[j + 1] && letters[j + 1].match(/\W/)) {
setArg(letters[j], arg.slice(j + 2))
broken = true
break
} else {
setArg(letters[j], defaultForType(guessType(letters[j], flags)))
}
}
key = arg.slice(-1)[0]
if (!broken && key !== '-') {
// nargs format = '-f a b c'
if (checkAllAliases(key, opts.narg)) {
i = eatNargs(i, key, args)
// array format = '-f a b c'
} else if (checkAllAliases(key, flags.arrays) && args.length > i + 1) {
i = eatArray(i, key, args)
} else {
if (args[i + 1] && !/^(-|--)[^-]/.test(args[i + 1])
&& !checkAllAliases(key, flags.bools)
&& !checkAllAliases(key, flags.counts)) {
setArg(key, args[i + 1])
i++
} else if (args[i + 1] && /true|false/.test(args[i + 1])) {
setArg(key, args[i + 1])
i++
} else {
setArg(key, defaultForType(guessType(key, flags)))
}
}
}
} else {
argv._.push(
flags.strings['_'] || !isNumber(arg) ? arg : Number(arg)
)
}
}
setConfig(argv)
applyDefaultsAndAliases(argv, aliases, defaults)
Object.keys(flags.counts).forEach(function (key) {
setArg(key, defaults[key])
})
notFlags.forEach(function (key) {
argv._.push(key)
})
// how many arguments should we consume, based
// on the nargs option?
function eatNargs (i, key, args) {
var toEat = checkAllAliases(key, opts.narg)
if (args.length - (i + 1) < toEat) throw Error('not enough arguments following: ' + key)
for (var ii = i + 1; ii < (toEat + i + 1); ii++) {
setArg(key, args[ii])
}
return (i + toEat)
}
// if an option is an array, eat all non-hyphenated arguments
// following it... YUM!
// e.g., --foo apple banana cat becomes ["apple", "banana", "cat"]
function eatArray (i, key, args) {
for (var ii = i + 1; ii < args.length; ii++) {
if (/^-/.test(args[ii])) break
i = ii
setArg(key, args[ii])
}
return i
}
function setArg (key, val) {
// handle parsing boolean arguments --foo=true --bar false.
if (checkAllAliases(key, flags.bools) || checkAllAliases(key, flags.counts)) {
if (typeof val === 'string') val = val === 'true'
}
if (/-/.test(key) && !(aliases[key] && aliases[key].length)) {
var c = camelCase(key)
aliases[key] = [c]
newAliases[c] = true
}
var value = !checkAllAliases(key, flags.strings) && isNumber(val) ? Number(val) : val
if (checkAllAliases(key, flags.counts)) {
value = increment
}
var splitKey = key.split('.')
setKey(argv, splitKey, value)
;(aliases[splitKey[0]] || []).forEach(function (x) {
x = x.split('.')
// handle populating dot notation for both
// the key and its aliases.
if (splitKey.length > 1) {
var a = [].concat(splitKey)
a.shift() // nuke the old key.
x = x.concat(a)
}
setKey(argv, x, value)
})
var keys = [key].concat(aliases[key] || [])
for (var i = 0, l = keys.length; i < l; i++) {
if (flags.normalize[keys[i]]) {
keys.forEach(function (key) {
argv.__defineSetter__(key, function (v) {
val = path.normalize(v)
})
argv.__defineGetter__(key, function () {
return typeof val === 'string' ?
path.normalize(val) : val
})
})
break
}
}
}
// set args from config.json file, this should be
// applied last so that defaults can be applied.
function setConfig (argv) {
var configLookup = {}
// expand defaults/aliases, in-case any happen to reference
// the config.json file.
applyDefaultsAndAliases(configLookup, aliases, defaults)
Object.keys(flags.configs).forEach(function (configKey) {
var configPath = argv[configKey] || configLookup[configKey]
if (configPath) {
try {
var config = require(path.resolve(process.cwd(), configPath))
Object.keys(config).forEach(function (key) {
// setting arguments via CLI takes precedence over
// values within the config file.
if (argv[key] === undefined) {
delete argv[key]
setArg(key, config[key])
}
})
} catch (ex) {
throw Error('invalid json config file: ' + configPath)
}
}
})
}
function applyDefaultsAndAliases (obj, aliases, defaults) {
Object.keys(defaults).forEach(function (key) {
if (!hasKey(obj, key.split('.'))) {
setKey(obj, key.split('.'), defaults[key])
;(aliases[key] || []).forEach(function (x) {
setKey(obj, x.split('.'), defaults[key])
})
}
})
}
function hasKey (obj, keys) {
var o = obj
keys.slice(0, -1).forEach(function (key) {
o = (o[key] || {})
})
var key = keys[keys.length - 1]
return key in o
}
function setKey (obj, keys, value) {
var o = obj
keys.slice(0, -1).forEach(function (key) {
if (o[key] === undefined) o[key] = {}
o = o[key]
})
var key = keys[keys.length - 1]
if (value === increment) {
o[key] = increment(o[key])
} else if (o[key] === undefined && checkAllAliases(key, flags.arrays)) {
o[key] = Array.isArray(value) ? value : [value]
} else if (o[key] === undefined || typeof o[key] === 'boolean') {
o[key] = value
} else if (Array.isArray(o[key])) {
o[key].push(value)
} else {
o[key] = [ o[key], value ]
}
}
// extend the aliases list with inferred aliases.
function extendAliases (obj) {
Object.keys(obj || {}).forEach(function (key) {
aliases[key] = [].concat(opts.alias[key] || [])
// For "--option-name", also set argv.optionName
aliases[key].concat(key).forEach(function (x) {
if (/-/.test(x)) {
var c = camelCase(x)
aliases[key].push(c)
newAliases[c] = true
}
})
aliases[key].forEach(function (x) {
aliases[x] = [key].concat(aliases[key].filter(function (y) {
return x !== y
}))
})
})
}
// check if a flag is set for any of a key's aliases.
function checkAllAliases (key, flag) {
var isSet = false,
toCheck = [].concat(aliases[key] || [], key)
toCheck.forEach(function (key) {
if (flag[key]) isSet = flag[key]
})
return isSet
}
// return a default value, given the type of a flag.,
// e.g., key of type 'string' will default to '', rather than 'true'.
function defaultForType (type) {
var def = {
boolean: true,
string: '',
array: []
}
return def[type]
}
// given a flag, enforce a default type.
function guessType (key, flags) {
var type = 'boolean'
if (flags.strings && flags.strings[key]) type = 'string'
else if (flags.arrays && flags.arrays[key]) type = 'array'
return type
}
function isNumber (x) {
if (typeof x === 'number') return true
if (/^0x[0-9a-f]+$/i.test(x)) return true
return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x)
}
return {
argv: argv,
aliases: aliases,
newAliases: newAliases
}
}