/
command.ts
557 lines (488 loc) · 18.8 KB
/
command.ts
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import { Dictionary, assertNotStrictEqual } from './common-types'
import { isPromise } from './is-promise'
import { applyMiddleware, commandMiddlewareFactory, Middleware } from './middleware'
import { parseCommand, Positional } from './parse-command'
import * as path from 'path'
import { RequireDirectoryOptions } from 'require-directory'
import { UsageInstance } from './usage'
import { inspect } from 'util'
import { ValidationInstance } from './validation'
import { YargsInstance, isYargsInstance, Options, OptionDefinition, Context, Configuration, Arguments, DetailedArguments } from './yargs'
import requireDirectory = require('require-directory')
import whichModule = require('which-module')
import Parser = require('yargs-parser')
const DEFAULT_MARKER = /(^\*)|(^\$0)/
// handles parsing positional arguments,
// and populating argv with said positional
// arguments.
export function command (
yargs: YargsInstance,
usage: UsageInstance,
validation: ValidationInstance,
globalMiddleware: Middleware[] = []
) {
const self: CommandInstance = {} as CommandInstance
let handlers: Dictionary<CommandHandler> = {}
let aliasMap: Dictionary<string> = {}
let defaultCommand: CommandHandler | undefined
self.addHandler = function addHandler (
cmd: string | string[] | CommandHandlerDefinition,
description?: string | false,
builder?: CommandBuilder | CommandBuilderDefinition,
handler?: CommandHandlerCallback,
commandMiddleware?: Middleware[],
deprecated?: boolean
) {
let aliases: string[] = []
const middlewares = commandMiddlewareFactory(commandMiddleware)
handler = handler || (() => { })
if (Array.isArray(cmd)) {
aliases = cmd.slice(1)
cmd = cmd[0]
} else if (isCommandHandlerDefinition(cmd)) {
let command = (Array.isArray(cmd.command) || typeof cmd.command === 'string') ? cmd.command : moduleName(cmd)
if (cmd.aliases) command = ([] as string[]).concat(command).concat(cmd.aliases)
self.addHandler(command, extractDesc(cmd), cmd.builder, cmd.handler, cmd.middlewares, cmd.deprecated)
return
}
// allow a module to be provided instead of separate builder and handler
if (isCommandBuilderDefinition(builder)) {
self.addHandler([cmd].concat(aliases), description, builder.builder, builder.handler, builder.middlewares, builder.deprecated)
return
}
// parse positionals out of cmd string
const parsedCommand = parseCommand(cmd)
// remove positional args from aliases only
aliases = aliases.map(alias => 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, deprecated)
}
handlers[parsedCommand.cmd] = {
original: cmd,
description,
handler,
builder: builder || {},
middlewares,
deprecated,
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: any) => 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
}
requireDirectory({ require: req, filename: callerFile } as NodeModule, 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: CommandHandlerDefinition) {
const mod = whichModule(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: string) {
return path.basename(filename, path.extname(filename))
}
function extractDesc ({ describe, description, desc }: CommandHandlerDefinition) {
for (const test of [describe, description, desc]) {
if (typeof test === 'string' || test === false) return test
assertNotStrictEqual(test, true as true)
}
return false
}
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: Arguments | Promise<Arguments> = parsed.argv
let positionalMap: Dictionary<string[]> = {}
if (command) {
currentContext.commands.push(command)
currentContext.fullCommands.push(commandHandler.original)
}
const builder = commandHandler.builder
if (isCommandBuilderCallback(builder)) {
// a function can be provided, which builds
// up a yargs chain and possibly returns it.
const builderOutput = builder(yargs.reset(parsed.aliases))
const innerYargs = isYargsInstance(builderOutput) ? builderOutput : yargs
if (shouldUpdateUsage(innerYargs)) {
innerYargs.getUsageInstance().usage(
usageFromParentCommandsCommandHandler(parentCommands, commandHandler),
commandHandler.description
)
}
innerArgv = innerYargs._parseArgs(null, null, true, commandIndex)
aliases = (innerYargs.parsed as DetailedArguments).aliases
} else if (isCommandBuilderOptionDefinitions(builder)) {
// as a short hand, an object can instead be provided, specifying
// the options that a command takes.
const 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, builder[key])
})
innerArgv = innerYargs._parseArgs(null, null, true, commandIndex)
aliases = (innerYargs.parsed as DetailedArguments).aliases
}
if (!yargs._hasOutput()) {
positionalMap = populatePositionals(commandHandler, innerArgv as Arguments, currentContext)
}
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 as Arguments,
aliases,
positionalMap,
(yargs.parsed as DetailedArguments).error,
!command)
}
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)
}
const handlerFinishCommand = yargs.getHandlerFinishCommand()
if (isPromise(handlerResult)) {
yargs.getUsageInstance().cacheHelpMessage()
handlerResult
.then(value => {
if (handlerFinishCommand) {
handlerFinishCommand(value)
}
})
.catch(error => {
try {
yargs.getUsageInstance().fail(null, error)
} catch (err) {
// fail's throwing would cause an unhandled rejection.
}
})
.then(() => {
yargs.getUsageInstance().clearCachedHelpMessage()
})
} else {
if (handlerFinishCommand) {
handlerFinishCommand(handlerResult)
}
}
}
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: YargsInstance) {
return !yargs.getUsageInstance().getUsageDisabled() &&
yargs.getUsageInstance().getUsage().length === 0
}
function usageFromParentCommandsCommandHandler (parentCommands: string[], commandHandler: 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) {
assertNotStrictEqual(defaultCommand, undefined)
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 (isCommandBuilderCallback(builder)) {
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: CommandHandler, argv: Arguments, context: Context) {
argv._ = argv._.slice(context.commands.length) // nuke the current commands
const demanded = commandHandler.demanded.slice(0)
const optional = commandHandler.optional.slice(0)
const positionalMap: Dictionary<string[]> = {}
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._.map(a => '' + a))
postProcessPositionals(argv, positionalMap, self.cmdToParseOptions(commandHandler.original))
return positionalMap
}
function populatePositional (positional: Positional, argv: Arguments, positionalMap: Dictionary<string[]>) {
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: Arguments, positionalMap: Dictionary<string[]>, parseOptions: Positionals) {
// 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)
for (const key of Object.keys(parseOptions.alias)) {
options.alias[key] = (options.alias[key] || []).concat(parseOptions.alias[key])
}
options.array = options.array.concat(parseOptions.array)
delete options.config // don't load config when processing positionals.
const unparsed: string[] = []
Object.keys(positionalMap).forEach((key) => {
positionalMap[key].map((value) => {
if (options.configuration['unknown-options-as-args']) options.key[key] = true
unparsed.push(`--${key}`)
unparsed.push(value)
})
})
// short-circuit parse.
if (!unparsed.length) return
const config: Configuration = 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) => {
positionalKeys.push(...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: Positionals = {
array: [],
default: {},
alias: {},
demand: {}
}
const parsed = parseCommand(cmdString)
parsed.demanded.forEach((d) => {
const [cmd, ...aliases] = d.cmd
if (d.variadic) {
parseOptions.array.push(cmd)
parseOptions.default[cmd] = []
}
parseOptions.alias[cmd] = aliases
parseOptions.demand[cmd] = true
})
parsed.optional.forEach((o) => {
const [cmd, ...aliases] = o.cmd
if (o.variadic) {
parseOptions.array.push(cmd)
parseOptions.default[cmd] = []
}
parseOptions.alias[cmd] = aliases
})
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.
const frozens: FrozenCommandInstance[] = []
self.freeze = () => {
frozens.push({
handlers,
aliasMap,
defaultCommand
})
}
self.unfreeze = () => {
const frozen = frozens.pop()
assertNotStrictEqual(frozen, undefined)
;({
handlers,
aliasMap,
defaultCommand
} = frozen)
}
return self
}
/** Instance of the command module. */
export interface CommandInstance {
addDirectory(
dir: string,
context: Context,
req: NodeRequireFunction,
callerFile: string,
opts?: RequireDirectoryOptions<any>
): void
addHandler (handler: CommandHandlerDefinition): void
addHandler (
cmd: string | string[],
description: CommandHandler['description'],
builder?: CommandBuilderDefinition | CommandBuilder,
handler?: CommandHandlerCallback,
commandMiddleware?: Middleware[],
deprecated?: boolean
): void
cmdToParseOptions (cmdString: string): Positionals
freeze(): void
getCommandHandlers (): Dictionary<CommandHandler>
getCommands (): string[]
hasDefaultCommand (): boolean
reset (): CommandInstance
runCommand (command: string | null, yargs: YargsInstance, parsed: DetailedArguments, commandIndex?: number): Arguments | Promise<Arguments>
runDefaultBuilderOn (yargs: YargsInstance): void
unfreeze(): void
}
export interface CommandHandlerDefinition extends Partial<Pick<CommandHandler,
'deprecated' | 'description' | 'handler' | 'middlewares'
>> {
aliases?: string[]
builder?: CommandBuilder | CommandBuilderDefinition
command?: string | string[]
desc?: CommandHandler['description']
describe?: CommandHandler['description']
}
export function isCommandHandlerDefinition (cmd: string | string[] | CommandHandlerDefinition): cmd is CommandHandlerDefinition {
return typeof cmd === 'object'
}
export interface CommandBuilderDefinition {
builder?: CommandBuilder
deprecated?: boolean
handler: CommandHandlerCallback
middlewares?: Middleware[]
}
export function isCommandBuilderDefinition (builder?: CommandBuilder | CommandBuilderDefinition): builder is CommandBuilderDefinition {
return typeof builder === 'object' &&
!!(builder as CommandBuilderDefinition).builder &&
typeof (builder as CommandBuilderDefinition).handler === 'function'
}
export interface CommandHandlerCallback {
(argv: Arguments): any
}
export interface CommandHandler {
builder: CommandBuilder
demanded: Positional[]
deprecated?: boolean
description?: string | false
handler: CommandHandlerCallback
middlewares: Middleware[]
optional: Positional[]
original: string
}
// To be completed later with other CommandBuilder flavours
export type CommandBuilder = CommandBuilderCallback | Dictionary<OptionDefinition>
interface CommandBuilderCallback {
(y: YargsInstance): YargsInstance | void
}
export function isCommandBuilderCallback (builder: CommandBuilder): builder is CommandBuilderCallback {
return typeof builder === 'function'
}
function isCommandBuilderOptionDefinitions (builder: CommandBuilder): builder is Dictionary<OptionDefinition> {
return typeof builder === 'object'
}
interface Positionals extends Pick<Options, 'alias' | 'array' | 'default'> {
demand: Dictionary<boolean>
}
type FrozenCommandInstance = {
handlers: Dictionary<CommandHandler>
aliasMap: Dictionary<string>
defaultCommand: CommandHandler | undefined
}
export interface FinishCommandHandler {
(handlerResult: any): any
}