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'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 }
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