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Mini Shell
Mini Shell
'use strict'
// this file handles outputting usage instructions,
// failures, etc. keeps logging in one place.
const decamelize = require('decamelize')
const stringWidth = require('string-width')
const objFilter = require('./obj-filter')
const path = require('path')
const setBlocking = require('set-blocking')
const YError = require('./yerror')
module.exports = function usage (yargs, y18n) {
const __ = y18n.__
const self = {}
// methods for ouputting/building failure message.
const fails = []
self.failFn = function failFn (f) {
fails.push(f)
}
let failMessage = null
let showHelpOnFail = true
self.showHelpOnFail = function showHelpOnFailFn (enabled, message) {
if (typeof enabled === 'string') {
message = enabled
enabled = true
} else if (typeof enabled === 'undefined') {
enabled = true
}
failMessage = message
showHelpOnFail = enabled
return self
}
let failureOutput = false
self.fail = function fail (msg, err) {
const logger = yargs._getLoggerInstance()
if (fails.length) {
for (let i = fails.length - 1; i >= 0; --i) {
fails[i](msg, err, self)
}
} else {
if (yargs.getExitProcess()) setBlocking(true)
// don't output failure message more than once
if (!failureOutput) {
failureOutput = true
if (showHelpOnFail) {
yargs.showHelp('error')
logger.error()
}
if (msg || err) logger.error(msg || err)
if (failMessage) {
if (msg || err) logger.error('')
logger.error(failMessage)
}
}
err = err || new YError(msg)
if (yargs.getExitProcess()) {
return yargs.exit(1)
} else if (yargs._hasParseCallback()) {
return yargs.exit(1, err)
} else {
throw err
}
}
}
// methods for ouputting/building help (usage) message.
let usages = []
let usageDisabled = false
self.usage = (msg, description) => {
if (msg === null) {
usageDisabled = true
usages = []
return
}
usageDisabled = false
usages.push([msg, description || ''])
return self
}
self.getUsage = () => {
return usages
}
self.getUsageDisabled = () => {
return usageDisabled
}
self.getPositionalGroupName = () => {
return __('Positionals:')
}
let examples = []
self.example = (cmd, description) => {
examples.push([cmd, description || ''])
}
let commands = []
self.command = function command (cmd, description, isDefault, aliases) {
// the last default wins, so cancel out any previously set default
if (isDefault) {
commands = commands.map((cmdArray) => {
cmdArray[2] = false
return cmdArray
})
}
commands.push([cmd, description || '', isDefault, aliases])
}
self.getCommands = () => commands
let descriptions = {}
self.describe = function describe (key, desc) {
if (typeof key === 'object') {
Object.keys(key).forEach((k) => {
self.describe(k, key[k])
})
} else {
descriptions[key] = desc
}
}
self.getDescriptions = () => descriptions
let epilogs = []
self.epilog = (msg) => {
epilogs.push(msg)
}
let wrapSet = false
let wrap
self.wrap = (cols) => {
wrapSet = true
wrap = cols
}
function getWrap () {
if (!wrapSet) {
wrap = windowWidth()
wrapSet = true
}
return wrap
}
const deferY18nLookupPrefix = '__yargsString__:'
self.deferY18nLookup = str => deferY18nLookupPrefix + str
const defaultGroup = 'Options:'
self.help = function help () {
if (cachedHelpMessage) return cachedHelpMessage
normalizeAliases()
// handle old demanded API
const base$0 = yargs.customScriptName ? yargs.$0 : path.basename(yargs.$0)
const demandedOptions = yargs.getDemandedOptions()
const demandedCommands = yargs.getDemandedCommands()
const groups = yargs.getGroups()
const options = yargs.getOptions()
let keys = []
keys = keys.concat(Object.keys(descriptions))
keys = keys.concat(Object.keys(demandedOptions))
keys = keys.concat(Object.keys(demandedCommands))
keys = keys.concat(Object.keys(options.default))
keys = keys.filter(filterHiddenOptions)
keys = Object.keys(keys.reduce((acc, key) => {
if (key !== '_') acc[key] = true
return acc
}, {}))
const theWrap = getWrap()
const ui = require('cliui')({
width: theWrap,
wrap: !!theWrap
})
// the usage string.
if (!usageDisabled) {
if (usages.length) {
// user-defined usage.
usages.forEach((usage) => {
ui.div(`${usage[0].replace(/\$0/g, base$0)}`)
if (usage[1]) {
ui.div({ text: `${usage[1]}`, padding: [1, 0, 0, 0] })
}
})
ui.div()
} else if (commands.length) {
let u = null
// demonstrate how commands are used.
if (demandedCommands._) {
u = `${base$0} <${__('command')}>\n`
} else {
u = `${base$0} [${__('command')}]\n`
}
ui.div(`${u}`)
}
}
// your application's commands, i.e., non-option
// arguments populated in '_'.
if (commands.length) {
ui.div(__('Commands:'))
const context = yargs.getContext()
const parentCommands = context.commands.length ? `${context.commands.join(' ')} ` : ''
if (yargs.getParserConfiguration()['sort-commands'] === true) {
commands = commands.sort((a, b) => a[0].localeCompare(b[0]))
}
commands.forEach((command) => {
const commandString = `${base$0} ${parentCommands}${command[0].replace(/^\$0 ?/, '')}` // drop $0 from default commands.
ui.span(
{
text: commandString,
padding: [0, 2, 0, 2],
width: maxWidth(commands, theWrap, `${base$0}${parentCommands}`) + 4
},
{ text: command[1] }
)
const hints = []
if (command[2]) hints.push(`[${__('default:').slice(0, -1)}]`) // TODO hacking around i18n here
if (command[3] && command[3].length) {
hints.push(`[${__('aliases:')} ${command[3].join(', ')}]`)
}
if (hints.length) {
ui.div({ text: hints.join(' '), padding: [0, 0, 0, 2], align: 'right' })
} else {
ui.div()
}
})
ui.div()
}
// perform some cleanup on the keys array, making it
// only include top-level keys not their aliases.
const aliasKeys = (Object.keys(options.alias) || [])
.concat(Object.keys(yargs.parsed.newAliases) || [])
keys = keys.filter(key => !yargs.parsed.newAliases[key] && aliasKeys.every(alias => (options.alias[alias] || []).indexOf(key) === -1))
// populate 'Options:' group with any keys that have not
// explicitly had a group set.
if (!groups[defaultGroup]) groups[defaultGroup] = []
addUngroupedKeys(keys, options.alias, groups)
// display 'Options:' table along with any custom tables:
Object.keys(groups).forEach((groupName) => {
if (!groups[groupName].length) return
// if we've grouped the key 'f', but 'f' aliases 'foobar',
// normalizedKeys should contain only 'foobar'.
const normalizedKeys = groups[groupName].filter(filterHiddenOptions).map((key) => {
if (~aliasKeys.indexOf(key)) return key
for (let i = 0, aliasKey; (aliasKey = aliasKeys[i]) !== undefined; i++) {
if (~(options.alias[aliasKey] || []).indexOf(key)) return aliasKey
}
return key
})
if (normalizedKeys.length < 1) return
ui.div(__(groupName))
// actually generate the switches string --foo, -f, --bar.
const switches = normalizedKeys.reduce((acc, key) => {
acc[key] = [ key ].concat(options.alias[key] || [])
.map(sw => {
// for the special positional group don't
// add '--' or '-' prefix.
if (groupName === self.getPositionalGroupName()) return sw
else return (sw.length > 1 ? '--' : '-') + sw
})
.join(', ')
return acc
}, {})
normalizedKeys.forEach((key) => {
const kswitch = switches[key]
let desc = descriptions[key] || ''
let type = null
if (~desc.lastIndexOf(deferY18nLookupPrefix)) desc = __(desc.substring(deferY18nLookupPrefix.length))
if (~options.boolean.indexOf(key)) type = `[${__('boolean')}]`
if (~options.count.indexOf(key)) type = `[${__('count')}]`
if (~options.string.indexOf(key)) type = `[${__('string')}]`
if (~options.normalize.indexOf(key)) type = `[${__('string')}]`
if (~options.array.indexOf(key)) type = `[${__('array')}]`
if (~options.number.indexOf(key)) type = `[${__('number')}]`
const extra = [
type,
(key in demandedOptions) ? `[${__('required')}]` : null,
options.choices && options.choices[key] ? `[${__('choices:')} ${
self.stringifiedValues(options.choices[key])}]` : null,
defaultString(options.default[key], options.defaultDescription[key])
].filter(Boolean).join(' ')
ui.span(
{ text: kswitch, padding: [0, 2, 0, 2], width: maxWidth(switches, theWrap) + 4 },
desc
)
if (extra) ui.div({ text: extra, padding: [0, 0, 0, 2], align: 'right' })
else ui.div()
})
ui.div()
})
// describe some common use-cases for your application.
if (examples.length) {
ui.div(__('Examples:'))
examples.forEach((example) => {
example[0] = example[0].replace(/\$0/g, base$0)
})
examples.forEach((example) => {
if (example[1] === '') {
ui.div(
{
text: example[0],
padding: [0, 2, 0, 2]
}
)
} else {
ui.div(
{
text: example[0],
padding: [0, 2, 0, 2],
width: maxWidth(examples, theWrap) + 4
}, {
text: example[1]
}
)
}
})
ui.div()
}
// the usage string.
if (epilogs.length > 0) {
const e = epilogs.map(epilog => epilog.replace(/\$0/g, base$0)).join('\n')
ui.div(`${e}\n`)
}
// Remove the trailing white spaces
return ui.toString().replace(/\s*$/, '')
}
// return the maximum width of a string
// in the left-hand column of a table.
function maxWidth (table, theWrap, modifier) {
let width = 0
// table might be of the form [leftColumn],
// or {key: leftColumn}
if (!Array.isArray(table)) {
table = Object.keys(table).map(key => [table[key]])
}
table.forEach((v) => {
width = Math.max(
stringWidth(modifier ? `${modifier} ${v[0]}` : v[0]),
width
)
})
// if we've enabled 'wrap' we should limit
// the max-width of the left-column.
if (theWrap) width = Math.min(width, parseInt(theWrap * 0.5, 10))
return width
}
// make sure any options set for aliases,
// are copied to the keys being aliased.
function normalizeAliases () {
// handle old demanded API
const demandedOptions = yargs.getDemandedOptions()
const options = yargs.getOptions()
;(Object.keys(options.alias) || []).forEach((key) => {
options.alias[key].forEach((alias) => {
// copy descriptions.
if (descriptions[alias]) self.describe(key, descriptions[alias])
// copy demanded.
if (alias in demandedOptions) yargs.demandOption(key, demandedOptions[alias])
// type messages.
if (~options.boolean.indexOf(alias)) yargs.boolean(key)
if (~options.count.indexOf(alias)) yargs.count(key)
if (~options.string.indexOf(alias)) yargs.string(key)
if (~options.normalize.indexOf(alias)) yargs.normalize(key)
if (~options.array.indexOf(alias)) yargs.array(key)
if (~options.number.indexOf(alias)) yargs.number(key)
})
})
}
// if yargs is executing an async handler, we take a snapshot of the
// help message to display on failure:
let cachedHelpMessage
self.cacheHelpMessage = function () {
cachedHelpMessage = this.help()
}
// given a set of keys, place any keys that are
// ungrouped under the 'Options:' grouping.
function addUngroupedKeys (keys, aliases, groups) {
let groupedKeys = []
let toCheck = null
Object.keys(groups).forEach((group) => {
groupedKeys = groupedKeys.concat(groups[group])
})
keys.forEach((key) => {
toCheck = [key].concat(aliases[key])
if (!toCheck.some(k => groupedKeys.indexOf(k) !== -1)) {
groups[defaultGroup].push(key)
}
})
return groupedKeys
}
function filterHiddenOptions (key) {
return yargs.getOptions().hiddenOptions.indexOf(key) < 0 || yargs.parsed.argv[yargs.getOptions().showHiddenOpt]
}
self.showHelp = (level) => {
const logger = yargs._getLoggerInstance()
if (!level) level = 'error'
const emit = typeof level === 'function' ? level : logger[level]
emit(self.help())
}
self.functionDescription = (fn) => {
const description = fn.name ? decamelize(fn.name, '-') : __('generated-value')
return ['(', description, ')'].join('')
}
self.stringifiedValues = function stringifiedValues (values, separator) {
let string = ''
const sep = separator || ', '
const array = [].concat(values)
if (!values || !array.length) return string
array.forEach((value) => {
if (string.length) string += sep
string += JSON.stringify(value)
})
return string
}
// format the default-value-string displayed in
// the right-hand column.
function defaultString (value, defaultDescription) {
let string = `[${__('default:')} `
if (value === undefined && !defaultDescription) return null
if (defaultDescription) {
string += defaultDescription
} else {
switch (typeof value) {
case 'string':
string += `"${value}"`
break
case 'object':
string += JSON.stringify(value)
break
default:
string += value
}
}
return `${string}]`
}
// guess the width of the console window, max-width 80.
function windowWidth () {
const maxWidth = 80
if (typeof process === 'object' && process.stdout && process.stdout.columns) {
return Math.min(maxWidth, process.stdout.columns)
} else {
return maxWidth
}
}
// logic for displaying application version.
let version = null
self.version = (ver) => {
version = ver
}
self.showVersion = () => {
const logger = yargs._getLoggerInstance()
logger.log(version)
}
self.reset = function reset (localLookup) {
// do not reset wrap here
// do not reset fails here
failMessage = null
failureOutput = false
usages = []
usageDisabled = false
epilogs = []
examples = []
commands = []
descriptions = objFilter(descriptions, (k, v) => !localLookup[k])
return self
}
let frozens = []
self.freeze = function freeze () {
let frozen = {}
frozens.push(frozen)
frozen.failMessage = failMessage
frozen.failureOutput = failureOutput
frozen.usages = usages
frozen.usageDisabled = usageDisabled
frozen.epilogs = epilogs
frozen.examples = examples
frozen.commands = commands
frozen.descriptions = descriptions
}
self.unfreeze = function unfreeze () {
let frozen = frozens.pop()
failMessage = frozen.failMessage
failureOutput = frozen.failureOutput
usages = frozen.usages
usageDisabled = frozen.usageDisabled
epilogs = frozen.epilogs
examples = frozen.examples
commands = frozen.commands
descriptions = frozen.descriptions
}
return self
}
Zerion Mini Shell 1.0