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