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Mini Shell
Mini Shell
'use strict'
const inspect = require('util').inspect
const isPromise = require('./is-promise')
const { applyMiddleware, commandMiddlewareFactory } = require('./middleware')
const path = require('path')
const Parser = require('yargs-parser')
const DEFAULT_MARKER = /(^\*)|(^\$0)/
// handles parsing positional arguments,
// and populating argv with said positional
// arguments.
module.exports = function command (yargs, usage, validation, globalMiddleware) {
const self = {}
let handlers = {}
let aliasMap = {}
let defaultCommand
globalMiddleware = globalMiddleware || []
self.addHandler = function addHandler (cmd, description, builder, handler, commandMiddleware) {
let aliases = []
const middlewares = commandMiddlewareFactory(commandMiddleware)
handler = handler || (() => {})
if (Array.isArray(cmd)) {
aliases = cmd.slice(1)
cmd = cmd[0]
} else if (typeof cmd === 'object') {
let command = (Array.isArray(cmd.command) || typeof cmd.command === 'string') ? cmd.command : moduleName(cmd)
if (cmd.aliases) command = [].concat(command).concat(cmd.aliases)
self.addHandler(command, extractDesc(cmd), cmd.builder, cmd.handler, cmd.middlewares)
return
}
// allow a module to be provided instead of separate builder and handler
if (typeof builder === 'object' && builder.builder && typeof builder.handler === 'function') {
self.addHandler([cmd].concat(aliases), description, builder.builder, builder.handler, builder.middlewares)
return
}
// parse positionals out of cmd string
const parsedCommand = self.parseCommand(cmd)
// remove positional args from aliases only
aliases = aliases.map(alias => self.parseCommand(alias).cmd)
// check for default and filter out '*''
let isDefault = false
const parsedAliases = [parsedCommand.cmd].concat(aliases).filter((c) => {
if (DEFAULT_MARKER.test(c)) {
isDefault = true
return false
}
return true
})
// standardize on $0 for default command.
if (parsedAliases.length === 0 && isDefault) parsedAliases.push('$0')
// shift cmd and aliases after filtering out '*'
if (isDefault) {
parsedCommand.cmd = parsedAliases[0]
aliases = parsedAliases.slice(1)
cmd = cmd.replace(DEFAULT_MARKER, parsedCommand.cmd)
}
// populate aliasMap
aliases.forEach((alias) => {
aliasMap[alias] = parsedCommand.cmd
})
if (description !== false) {
usage.command(cmd, description, isDefault, aliases)
}
handlers[parsedCommand.cmd] = {
original: cmd,
description: description,
handler,
builder: builder || {},
middlewares: middlewares || [],
demanded: parsedCommand.demanded,
optional: parsedCommand.optional
}
if (isDefault) defaultCommand = handlers[parsedCommand.cmd]
}
self.addDirectory = function addDirectory (dir, context, req, callerFile, opts) {
opts = opts || {}
// disable recursion to support nested directories of subcommands
if (typeof opts.recurse !== 'boolean') opts.recurse = false
// exclude 'json', 'coffee' from require-directory defaults
if (!Array.isArray(opts.extensions)) opts.extensions = ['js']
// allow consumer to define their own visitor function
const parentVisit = typeof opts.visit === 'function' ? opts.visit : o => o
// call addHandler via visitor function
opts.visit = function visit (obj, joined, filename) {
const visited = parentVisit(obj, joined, filename)
// allow consumer to skip modules with their own visitor
if (visited) {
// check for cyclic reference
// each command file path should only be seen once per execution
if (~context.files.indexOf(joined)) return visited
// keep track of visited files in context.files
context.files.push(joined)
self.addHandler(visited)
}
return visited
}
require('require-directory')({ require: req, filename: callerFile }, dir, opts)
}
// lookup module object from require()d command and derive name
// if module was not require()d and no name given, throw error
function moduleName (obj) {
const mod = require('which-module')(obj)
if (!mod) throw new Error(`No command name given for module: ${inspect(obj)}`)
return commandFromFilename(mod.filename)
}
// derive command name from filename
function commandFromFilename (filename) {
return path.basename(filename, path.extname(filename))
}
function extractDesc (obj) {
for (let keys = ['describe', 'description', 'desc'], i = 0, l = keys.length, test; i < l; i++) {
test = obj[keys[i]]
if (typeof test === 'string' || typeof test === 'boolean') return test
}
return false
}
self.parseCommand = function parseCommand (cmd) {
const extraSpacesStrippedCommand = cmd.replace(/\s{2,}/g, ' ')
const splitCommand = extraSpacesStrippedCommand.split(/\s+(?![^[]*]|[^<]*>)/)
const bregex = /\.*[\][<>]/g
const parsedCommand = {
cmd: (splitCommand.shift()).replace(bregex, ''),
demanded: [],
optional: []
}
splitCommand.forEach((cmd, i) => {
let variadic = false
cmd = cmd.replace(/\s/g, '')
if (/\.+[\]>]/.test(cmd) && i === splitCommand.length - 1) variadic = true
if (/^\[/.test(cmd)) {
parsedCommand.optional.push({
cmd: cmd.replace(bregex, '').split('|'),
variadic
})
} else {
parsedCommand.demanded.push({
cmd: cmd.replace(bregex, '').split('|'),
variadic
})
}
})
return parsedCommand
}
self.getCommands = () => Object.keys(handlers).concat(Object.keys(aliasMap))
self.getCommandHandlers = () => handlers
self.hasDefaultCommand = () => !!defaultCommand
self.runCommand = function runCommand (command, yargs, parsed, commandIndex) {
let aliases = parsed.aliases
const commandHandler = handlers[command] || handlers[aliasMap[command]] || defaultCommand
const currentContext = yargs.getContext()
let numFiles = currentContext.files.length
const parentCommands = currentContext.commands.slice()
// what does yargs look like after the builder is run?
let innerArgv = parsed.argv
let innerYargs = null
let positionalMap = {}
if (command) {
currentContext.commands.push(command)
currentContext.fullCommands.push(commandHandler.original)
}
if (typeof commandHandler.builder === 'function') {
// a function can be provided, which builds
// up a yargs chain and possibly returns it.
innerYargs = commandHandler.builder(yargs.reset(parsed.aliases))
if (!innerYargs || (typeof innerYargs._parseArgs !== 'function')) {
innerYargs = yargs
}
if (shouldUpdateUsage(innerYargs)) {
innerYargs.getUsageInstance().usage(
usageFromParentCommandsCommandHandler(parentCommands, commandHandler),
commandHandler.description
)
}
innerArgv = innerYargs._parseArgs(null, null, true, commandIndex)
aliases = innerYargs.parsed.aliases
} else if (typeof commandHandler.builder === 'object') {
// as a short hand, an object can instead be provided, specifying
// the options that a command takes.
innerYargs = yargs.reset(parsed.aliases)
if (shouldUpdateUsage(innerYargs)) {
innerYargs.getUsageInstance().usage(
usageFromParentCommandsCommandHandler(parentCommands, commandHandler),
commandHandler.description
)
}
Object.keys(commandHandler.builder).forEach((key) => {
innerYargs.option(key, commandHandler.builder[key])
})
innerArgv = innerYargs._parseArgs(null, null, true, commandIndex)
aliases = innerYargs.parsed.aliases
}
if (!yargs._hasOutput()) {
positionalMap = populatePositionals(commandHandler, innerArgv, currentContext, yargs)
}
const middlewares = globalMiddleware.slice(0).concat(commandHandler.middlewares || [])
applyMiddleware(innerArgv, yargs, middlewares, true)
// we apply validation post-hoc, so that custom
// checks get passed populated positional arguments.
if (!yargs._hasOutput()) yargs._runValidation(innerArgv, aliases, positionalMap, yargs.parsed.error)
if (commandHandler.handler && !yargs._hasOutput()) {
yargs._setHasOutput()
// to simplify the parsing of positionals in commands,
// we temporarily populate '--' rather than _, with arguments
const populateDoubleDash = !!yargs.getOptions().configuration['populate--']
if (!populateDoubleDash) yargs._copyDoubleDash(innerArgv)
innerArgv = applyMiddleware(innerArgv, yargs, middlewares, false)
let handlerResult
if (isPromise(innerArgv)) {
handlerResult = innerArgv.then(argv => commandHandler.handler(argv))
} else {
handlerResult = commandHandler.handler(innerArgv)
}
if (isPromise(handlerResult)) {
yargs.getUsageInstance().cacheHelpMessage()
handlerResult.catch(error => {
try {
yargs.getUsageInstance().fail(null, error)
} catch (err) {
// fail's throwing would cause an unhandled rejection.
}
})
}
}
if (command) {
currentContext.commands.pop()
currentContext.fullCommands.pop()
}
numFiles = currentContext.files.length - numFiles
if (numFiles > 0) currentContext.files.splice(numFiles * -1, numFiles)
return innerArgv
}
function shouldUpdateUsage (yargs) {
return !yargs.getUsageInstance().getUsageDisabled() &&
yargs.getUsageInstance().getUsage().length === 0
}
function usageFromParentCommandsCommandHandler (parentCommands, commandHandler) {
const c = DEFAULT_MARKER.test(commandHandler.original) ? commandHandler.original.replace(DEFAULT_MARKER, '').trim() : commandHandler.original
const pc = parentCommands.filter((c) => { return !DEFAULT_MARKER.test(c) })
pc.push(c)
return `$0 ${pc.join(' ')}`
}
self.runDefaultBuilderOn = function (yargs) {
if (shouldUpdateUsage(yargs)) {
// build the root-level command string from the default string.
const commandString = DEFAULT_MARKER.test(defaultCommand.original)
? defaultCommand.original : defaultCommand.original.replace(/^[^[\]<>]*/, '$0 ')
yargs.getUsageInstance().usage(
commandString,
defaultCommand.description
)
}
const builder = defaultCommand.builder
if (typeof builder === 'function') {
builder(yargs)
} else {
Object.keys(builder).forEach((key) => {
yargs.option(key, builder[key])
})
}
}
// transcribe all positional arguments "command <foo> <bar> [apple]"
// onto argv.
function populatePositionals (commandHandler, argv, context, yargs) {
argv._ = argv._.slice(context.commands.length) // nuke the current commands
const demanded = commandHandler.demanded.slice(0)
const optional = commandHandler.optional.slice(0)
const positionalMap = {}
validation.positionalCount(demanded.length, argv._.length)
while (demanded.length) {
const demand = demanded.shift()
populatePositional(demand, argv, positionalMap)
}
while (optional.length) {
const maybe = optional.shift()
populatePositional(maybe, argv, positionalMap)
}
argv._ = context.commands.concat(argv._)
postProcessPositionals(argv, positionalMap, self.cmdToParseOptions(commandHandler.original))
return positionalMap
}
function populatePositional (positional, argv, positionalMap, parseOptions) {
const cmd = positional.cmd[0]
if (positional.variadic) {
positionalMap[cmd] = argv._.splice(0).map(String)
} else {
if (argv._.length) positionalMap[cmd] = [String(argv._.shift())]
}
}
// we run yargs-parser against the positional arguments
// applying the same parsing logic used for flags.
function postProcessPositionals (argv, positionalMap, parseOptions) {
// combine the parsing hints we've inferred from the command
// string with explicitly configured parsing hints.
const options = Object.assign({}, yargs.getOptions())
options.default = Object.assign(parseOptions.default, options.default)
options.alias = Object.assign(parseOptions.alias, options.alias)
options.array = options.array.concat(parseOptions.array)
delete options.config // don't load config when processing positionals.
const unparsed = []
Object.keys(positionalMap).forEach((key) => {
positionalMap[key].map((value) => {
unparsed.push(`--${key}`)
unparsed.push(value)
})
})
// short-circuit parse.
if (!unparsed.length) return
const config = Object.assign({}, options.configuration, {
'populate--': true
})
const parsed = Parser.detailed(unparsed, Object.assign({}, options, {
configuration: config
}))
if (parsed.error) {
yargs.getUsageInstance().fail(parsed.error.message, parsed.error)
} else {
// only copy over positional keys (don't overwrite
// flag arguments that were already parsed).
const positionalKeys = Object.keys(positionalMap)
Object.keys(positionalMap).forEach((key) => {
[].push.apply(positionalKeys, parsed.aliases[key])
})
Object.keys(parsed.argv).forEach((key) => {
if (positionalKeys.indexOf(key) !== -1) {
// any new aliases need to be placed in positionalMap, which
// is used for validation.
if (!positionalMap[key]) positionalMap[key] = parsed.argv[key]
argv[key] = parsed.argv[key]
}
})
}
}
self.cmdToParseOptions = function (cmdString) {
const parseOptions = {
array: [],
default: {},
alias: {},
demand: {}
}
const parsed = self.parseCommand(cmdString)
parsed.demanded.forEach((d) => {
const cmds = d.cmd.slice(0)
const cmd = cmds.shift()
if (d.variadic) {
parseOptions.array.push(cmd)
parseOptions.default[cmd] = []
}
cmds.forEach((c) => {
parseOptions.alias[cmd] = c
})
parseOptions.demand[cmd] = true
})
parsed.optional.forEach((o) => {
const cmds = o.cmd.slice(0)
const cmd = cmds.shift()
if (o.variadic) {
parseOptions.array.push(cmd)
parseOptions.default[cmd] = []
}
cmds.forEach((c) => {
parseOptions.alias[cmd] = c
})
})
return parseOptions
}
self.reset = () => {
handlers = {}
aliasMap = {}
defaultCommand = undefined
return self
}
// used by yargs.parse() to freeze
// the state of commands such that
// we can apply .parse() multiple times
// with the same yargs instance.
let frozens = []
self.freeze = () => {
let frozen = {}
frozens.push(frozen)
frozen.handlers = handlers
frozen.aliasMap = aliasMap
frozen.defaultCommand = defaultCommand
}
self.unfreeze = () => {
let frozen = frozens.pop()
handlers = frozen.handlers
aliasMap = frozen.aliasMap
defaultCommand = frozen.defaultCommand
}
return self
}
Zerion Mini Shell 1.0