3 const inspect = require('util').inspect
4 const path = require('path')
5 const Parser = require('yargs-parser')
7 const DEFAULT_MARKER = /(^\*)|(^\$0)/
9 // handles parsing positional arguments,
10 // and populating argv with said positional
12 module.exports = function command (yargs, usage, validation) {
17 self.addHandler = function addHandler (cmd, description, builder, handler, middlewares) {
19 handler = handler || (() => {})
20 middlewares = middlewares || []
21 if (Array.isArray(cmd)) {
22 aliases = cmd.slice(1)
24 } else if (typeof cmd === 'object') {
25 let command = (Array.isArray(cmd.command) || typeof cmd.command === 'string') ? cmd.command : moduleName(cmd)
26 if (cmd.aliases) command = [].concat(command).concat(cmd.aliases)
27 self.addHandler(command, extractDesc(cmd), cmd.builder, cmd.handler, cmd.middlewares)
31 // allow a module to be provided instead of separate builder and handler
32 if (typeof builder === 'object' && builder.builder && typeof builder.handler === 'function') {
33 self.addHandler([cmd].concat(aliases), description, builder.builder, builder.handler, builder.middlewares)
37 // parse positionals out of cmd string
38 const parsedCommand = self.parseCommand(cmd)
40 // remove positional args from aliases only
41 aliases = aliases.map(alias => self.parseCommand(alias).cmd)
43 // check for default and filter out '*''
45 const parsedAliases = [parsedCommand.cmd].concat(aliases).filter((c) => {
46 if (DEFAULT_MARKER.test(c)) {
53 // standardize on $0 for default command.
54 if (parsedAliases.length === 0 && isDefault) parsedAliases.push('$0')
56 // shift cmd and aliases after filtering out '*'
58 parsedCommand.cmd = parsedAliases[0]
59 aliases = parsedAliases.slice(1)
60 cmd = cmd.replace(DEFAULT_MARKER, parsedCommand.cmd)
64 aliases.forEach((alias) => {
65 aliasMap[alias] = parsedCommand.cmd
68 if (description !== false) {
69 usage.command(cmd, description, isDefault, aliases)
72 handlers[parsedCommand.cmd] = {
74 description: description,
76 builder: builder || {},
77 middlewares: middlewares || [],
78 demanded: parsedCommand.demanded,
79 optional: parsedCommand.optional
82 if (isDefault) defaultCommand = handlers[parsedCommand.cmd]
85 self.addDirectory = function addDirectory (dir, context, req, callerFile, opts) {
87 // disable recursion to support nested directories of subcommands
88 if (typeof opts.recurse !== 'boolean') opts.recurse = false
89 // exclude 'json', 'coffee' from require-directory defaults
90 if (!Array.isArray(opts.extensions)) opts.extensions = ['js']
91 // allow consumer to define their own visitor function
92 const parentVisit = typeof opts.visit === 'function' ? opts.visit : o => o
93 // call addHandler via visitor function
94 opts.visit = function visit (obj, joined, filename) {
95 const visited = parentVisit(obj, joined, filename)
96 // allow consumer to skip modules with their own visitor
98 // check for cyclic reference
99 // each command file path should only be seen once per execution
100 if (~context.files.indexOf(joined)) return visited
101 // keep track of visited files in context.files
102 context.files.push(joined)
103 self.addHandler(visited)
107 require('require-directory')({ require: req, filename: callerFile }, dir, opts)
110 // lookup module object from require()d command and derive name
111 // if module was not require()d and no name given, throw error
112 function moduleName (obj) {
113 const mod = require('which-module')(obj)
114 if (!mod) throw new Error(`No command name given for module: ${inspect(obj)}`)
115 return commandFromFilename(mod.filename)
118 // derive command name from filename
119 function commandFromFilename (filename) {
120 return path.basename(filename, path.extname(filename))
123 function extractDesc (obj) {
124 for (let keys = ['describe', 'description', 'desc'], i = 0, l = keys.length, test; i < l; i++) {
126 if (typeof test === 'string' || typeof test === 'boolean') return test
131 self.parseCommand = function parseCommand (cmd) {
132 const extraSpacesStrippedCommand = cmd.replace(/\s{2,}/g, ' ')
133 const splitCommand = extraSpacesStrippedCommand.split(/\s+(?![^[]*]|[^<]*>)/)
134 const bregex = /\.*[\][<>]/g
135 const parsedCommand = {
136 cmd: (splitCommand.shift()).replace(bregex, ''),
140 splitCommand.forEach((cmd, i) => {
142 cmd = cmd.replace(/\s/g, '')
143 if (/\.+[\]>]/.test(cmd) && i === splitCommand.length - 1) variadic = true
144 if (/^\[/.test(cmd)) {
145 parsedCommand.optional.push({
146 cmd: cmd.replace(bregex, '').split('|'),
150 parsedCommand.demanded.push({
151 cmd: cmd.replace(bregex, '').split('|'),
159 self.getCommands = () => Object.keys(handlers).concat(Object.keys(aliasMap))
161 self.getCommandHandlers = () => handlers
163 self.hasDefaultCommand = () => !!defaultCommand
165 self.runCommand = function runCommand (command, yargs, parsed, commandIndex) {
166 let aliases = parsed.aliases
167 const commandHandler = handlers[command] || handlers[aliasMap[command]] || defaultCommand
168 const currentContext = yargs.getContext()
169 let numFiles = currentContext.files.length
170 const parentCommands = currentContext.commands.slice()
172 // what does yargs look like after the buidler is run?
173 let innerArgv = parsed.argv
174 let innerYargs = null
175 let positionalMap = {}
177 currentContext.commands.push(command)
178 currentContext.fullCommands.push(commandHandler.original)
180 if (typeof commandHandler.builder === 'function') {
181 // a function can be provided, which builds
182 // up a yargs chain and possibly returns it.
183 innerYargs = commandHandler.builder(yargs.reset(parsed.aliases))
184 // if the builder function did not yet parse argv with reset yargs
185 // and did not explicitly set a usage() string, then apply the
186 // original command string as usage() for consistent behavior with
187 // options object below.
188 if (yargs.parsed === false) {
189 if (shouldUpdateUsage(yargs)) {
190 yargs.getUsageInstance().usage(
191 usageFromParentCommandsCommandHandler(parentCommands, commandHandler),
192 commandHandler.description
195 innerArgv = innerYargs ? innerYargs._parseArgs(null, null, true, commandIndex) : yargs._parseArgs(null, null, true, commandIndex)
197 innerArgv = yargs.parsed.argv
200 if (innerYargs && yargs.parsed === false) aliases = innerYargs.parsed.aliases
201 else aliases = yargs.parsed.aliases
202 } else if (typeof commandHandler.builder === 'object') {
203 // as a short hand, an object can instead be provided, specifying
204 // the options that a command takes.
205 innerYargs = yargs.reset(parsed.aliases)
206 if (shouldUpdateUsage(innerYargs)) {
207 innerYargs.getUsageInstance().usage(
208 usageFromParentCommandsCommandHandler(parentCommands, commandHandler),
209 commandHandler.description
212 Object.keys(commandHandler.builder).forEach((key) => {
213 innerYargs.option(key, commandHandler.builder[key])
215 innerArgv = innerYargs._parseArgs(null, null, true, commandIndex)
216 aliases = innerYargs.parsed.aliases
219 if (!yargs._hasOutput()) {
220 positionalMap = populatePositionals(commandHandler, innerArgv, currentContext, yargs)
223 // we apply validation post-hoc, so that custom
224 // checks get passed populated positional arguments.
225 if (!yargs._hasOutput()) yargs._runValidation(innerArgv, aliases, positionalMap, yargs.parsed.error)
227 if (commandHandler.handler && !yargs._hasOutput()) {
228 yargs._setHasOutput()
229 if (commandHandler.middlewares.length > 0) {
230 const middlewareArgs = commandHandler.middlewares.reduce(function (initialObj, middleware) {
231 return Object.assign(initialObj, middleware(innerArgv))
233 Object.assign(innerArgv, middlewareArgs)
235 const handlerResult = commandHandler.handler(innerArgv)
236 if (handlerResult && typeof handlerResult.then === 'function') {
239 (error) => yargs.getUsageInstance().fail(null, error)
245 currentContext.commands.pop()
246 currentContext.fullCommands.pop()
248 numFiles = currentContext.files.length - numFiles
249 if (numFiles > 0) currentContext.files.splice(numFiles * -1, numFiles)
254 function shouldUpdateUsage (yargs) {
255 return !yargs.getUsageInstance().getUsageDisabled() &&
256 yargs.getUsageInstance().getUsage().length === 0
259 function usageFromParentCommandsCommandHandler (parentCommands, commandHandler) {
260 const c = DEFAULT_MARKER.test(commandHandler.original) ? commandHandler.original.replace(DEFAULT_MARKER, '').trim() : commandHandler.original
261 const pc = parentCommands.filter((c) => { return !DEFAULT_MARKER.test(c) })
263 return `$0 ${pc.join(' ')}`
266 self.runDefaultBuilderOn = function (yargs) {
267 if (shouldUpdateUsage(yargs)) {
268 // build the root-level command string from the default string.
269 const commandString = DEFAULT_MARKER.test(defaultCommand.original)
270 ? defaultCommand.original : defaultCommand.original.replace(/^[^[\]<>]*/, '$0 ')
271 yargs.getUsageInstance().usage(
273 defaultCommand.description
276 const builder = defaultCommand.builder
277 if (typeof builder === 'function') {
280 Object.keys(builder).forEach((key) => {
281 yargs.option(key, builder[key])
286 // transcribe all positional arguments "command <foo> <bar> [apple]"
288 function populatePositionals (commandHandler, argv, context, yargs) {
289 argv._ = argv._.slice(context.commands.length) // nuke the current commands
290 const demanded = commandHandler.demanded.slice(0)
291 const optional = commandHandler.optional.slice(0)
292 const positionalMap = {}
294 validation.positionalCount(demanded.length, argv._.length)
296 while (demanded.length) {
297 const demand = demanded.shift()
298 populatePositional(demand, argv, positionalMap)
301 while (optional.length) {
302 const maybe = optional.shift()
303 populatePositional(maybe, argv, positionalMap)
306 argv._ = context.commands.concat(argv._)
308 postProcessPositionals(argv, positionalMap, self.cmdToParseOptions(commandHandler.original))
313 function populatePositional (positional, argv, positionalMap, parseOptions) {
314 const cmd = positional.cmd[0]
315 if (positional.variadic) {
316 positionalMap[cmd] = argv._.splice(0).map(String)
318 if (argv._.length) positionalMap[cmd] = [String(argv._.shift())]
322 // we run yargs-parser against the positional arguments
323 // applying the same parsing logic used for flags.
324 function postProcessPositionals (argv, positionalMap, parseOptions) {
325 // combine the parsing hints we've inferred from the command
326 // string with explicitly configured parsing hints.
327 const options = Object.assign({}, yargs.getOptions())
328 options.default = Object.assign(parseOptions.default, options.default)
329 options.alias = Object.assign(parseOptions.alias, options.alias)
330 options.array = options.array.concat(parseOptions.array)
333 Object.keys(positionalMap).forEach((key) => {
334 positionalMap[key].map((value) => {
335 unparsed.push(`--${key}`)
340 // short-circuit parse.
341 if (!unparsed.length) return
343 const parsed = Parser.detailed(unparsed, options)
346 yargs.getUsageInstance().fail(parsed.error.message, parsed.error)
348 // only copy over positional keys (don't overwrite
349 // flag arguments that were already parsed).
350 const positionalKeys = Object.keys(positionalMap)
351 Object.keys(positionalMap).forEach((key) => {
352 [].push.apply(positionalKeys, parsed.aliases[key])
355 Object.keys(parsed.argv).forEach((key) => {
356 if (positionalKeys.indexOf(key) !== -1) {
357 argv[key] = parsed.argv[key]
363 self.cmdToParseOptions = function (cmdString) {
364 const parseOptions = {
371 const parsed = self.parseCommand(cmdString)
372 parsed.demanded.forEach((d) => {
373 const cmds = d.cmd.slice(0)
374 const cmd = cmds.shift()
376 parseOptions.array.push(cmd)
377 parseOptions.default[cmd] = []
379 cmds.forEach((c) => {
380 parseOptions.alias[cmd] = c
382 parseOptions.demand[cmd] = true
385 parsed.optional.forEach((o) => {
386 const cmds = o.cmd.slice(0)
387 const cmd = cmds.shift()
389 parseOptions.array.push(cmd)
390 parseOptions.default[cmd] = []
392 cmds.forEach((c) => {
393 parseOptions.alias[cmd] = c
403 defaultCommand = undefined
407 // used by yargs.parse() to freeze
408 // the state of commands such that
409 // we can apply .parse() multiple times
410 // with the same yargs instance.
412 self.freeze = () => {
414 frozen.handlers = handlers
415 frozen.aliasMap = aliasMap
416 frozen.defaultCommand = defaultCommand
418 self.unfreeze = () => {
419 handlers = frozen.handlers
420 aliasMap = frozen.aliasMap
421 defaultCommand = frozen.defaultCommand