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/**
* Module dependencies.
*/
const EventEmitter = require('events').EventEmitter;
const spawn = require('child_process').spawn;
const path = require('path');
const fs = require('fs');
// @ts-check
class Option {
/**
* Initialize a new `Option` with the given `flags` and `description`.
*
* @param {string} flags
* @param {string} description
* @api public
*/
constructor(flags, description) {
this.flags = flags;
this.required = flags.includes('<'); // A value must be supplied when the option is specified.
this.optional = flags.includes('['); // A value is optional when the option is specified.
// variadic test ignores <value,...> et al which might be used to describe custom splitting of single argument
this.variadic = /\w\.\.\.[>\]]$/.test(flags); // The option can take multiple values.
this.mandatory = false; // The option must have a value after parsing, which usually means it must be specified on command line.
const optionFlags = _parseOptionFlags(flags);
this.short = optionFlags.shortFlag;
this.long = optionFlags.longFlag;
this.negate = false;
if (this.long) {
this.negate = this.long.startsWith('--no-');
}
this.description = description || '';
this.defaultValue = undefined;
}
/**
* Return option name.
*
* @return {string}
* @api private
*/
name() {
if (this.long) {
return this.long.replace(/^--/, '');
}
return this.short.replace(/^-/, '');
};
/**
* Return option name, in a camelcase format that can be used
* as a object attribute key.
*
* @return {string}
* @api private
*/
attributeName() {
return camelcase(this.name().replace(/^no-/, ''));
};
/**
* Check if `arg` matches the short or long flag.
*
* @param {string} arg
* @return {boolean}
* @api private
*/
is(arg) {
return this.short === arg || this.long === arg;
};
}
/**
* CommanderError class
* @class
*/
class CommanderError extends Error {
/**
* Constructs the CommanderError class
* @param {number} exitCode suggested exit code which could be used with process.exit
* @param {string} code an id string representing the error
* @param {string} message human-readable description of the error
* @constructor
*/
constructor(exitCode, code, message) {
super(message);
// properly capture stack trace in Node.js
Error.captureStackTrace(this, this.constructor);
this.name = this.constructor.name;
this.code = code;
this.exitCode = exitCode;
this.nestedError = undefined;
}
}
class Command extends EventEmitter {
/**
* Initialize a new `Command`.
*
* @param {string} [name]
* @api public
*/
constructor(name) {
super();
this.commands = [];
this.options = [];
this.parent = null;
this._allowUnknownOption = false;
this._args = [];
this.rawArgs = null;
this._scriptPath = null;
this._name = name || '';
this._optionValues = {};
this._storeOptionsAsProperties = true; // backwards compatible by default
this._storeOptionsAsPropertiesCalled = false;
this._passCommandToAction = true; // backwards compatible by default
this._actionResults = [];
this._actionHandler = null;
this._executableHandler = false;
this._executableFile = null; // custom name for executable
this._defaultCommandName = null;
this._exitCallback = null;
this._aliases = [];
this._combineFlagAndOptionalValue = true;
this._hidden = false;
this._hasHelpOption = true;
this._helpFlags = '-h, --help';
this._helpDescription = 'display help for command';
this._helpShortFlag = '-h';
this._helpLongFlag = '--help';
this._hasImplicitHelpCommand = undefined; // Deliberately undefined, not decided whether true or false
this._helpCommandName = 'help';
this._helpCommandnameAndArgs = 'help [command]';
this._helpCommandDescription = 'display help for command';
}
/**
* Define a command.
*
* There are two styles of command: pay attention to where to put the description.
*
* Examples:
*
* // Command implemented using action handler (description is supplied separately to `.command`)
* program
* .command('clone <source> [destination]')
* .description('clone a repository into a newly created directory')
* .action((source, destination) => {
* console.log('clone command called');
* });
*
* // Command implemented using separate executable file (description is second parameter to `.command`)
* program
* .command('start <service>', 'start named service')
* .command('stop [service]', 'stop named service, or all if no name supplied');
*
* @param {string} nameAndArgs - command name and arguments, args are `<required>` or `[optional]` and last may also be `variadic...`
* @param {Object|string} [actionOptsOrExecDesc] - configuration options (for action), or description (for executable)
* @param {Object} [execOpts] - configuration options (for executable)
* @return {Command} returns new command for action handler, or `this` for executable command
* @api public
*/
command(nameAndArgs, actionOptsOrExecDesc, execOpts) {
let desc = actionOptsOrExecDesc;
let opts = execOpts;
if (typeof desc === 'object' && desc !== null) {
opts = desc;
desc = null;
}
opts = opts || {};
const args = nameAndArgs.split(/ +/);
const cmd = this.createCommand(args.shift());
if (desc) {
cmd.description(desc);
cmd._executableHandler = true;
}
if (opts.isDefault) this._defaultCommandName = cmd._name;
cmd._hidden = !!(opts.noHelp || opts.hidden);
cmd._hasHelpOption = this._hasHelpOption;
cmd._helpFlags = this._helpFlags;
cmd._helpDescription = this._helpDescription;
cmd._helpShortFlag = this._helpShortFlag;
cmd._helpLongFlag = this._helpLongFlag;
cmd._helpCommandName = this._helpCommandName;
cmd._helpCommandnameAndArgs = this._helpCommandnameAndArgs;
cmd._helpCommandDescription = this._helpCommandDescription;
cmd._exitCallback = this._exitCallback;
cmd._storeOptionsAsProperties = this._storeOptionsAsProperties;
cmd._passCommandToAction = this._passCommandToAction;
cmd._combineFlagAndOptionalValue = this._combineFlagAndOptionalValue;
cmd._executableFile = opts.executableFile || null; // Custom name for executable file, set missing to null to match constructor
this.commands.push(cmd);
cmd._parseExpectedArgs(args);
cmd.parent = this;
if (desc) return this;
return cmd;
};
/**
* Factory routine to create a new unattached command.
*
* See .command() for creating an attached subcommand, which uses this routine to
* create the command. You can override createCommand to customise subcommands.
*
* @param {string} [name]
* @return {Command} new command
* @api public
*/
createCommand(name) {
return new Command(name);
};
/**
* Add a prepared subcommand.
*
* See .command() for creating an attached subcommand which inherits settings from its parent.
*
* @param {Command} cmd - new subcommand
* @param {Object} [opts] - configuration options
* @return {Command} `this` command for chaining
* @api public
*/
addCommand(cmd, opts) {
if (!cmd._name) throw new Error('Command passed to .addCommand() must have a name');
// To keep things simple, block automatic name generation for deeply nested executables.
// Fail fast and detect when adding rather than later when parsing.
function checkExplicitNames(commandArray) {
commandArray.forEach((cmd) => {
if (cmd._executableHandler && !cmd._executableFile) {
throw new Error(`Must specify executableFile for deeply nested executable: ${cmd.name()}`);
}
checkExplicitNames(cmd.commands);
});
}
checkExplicitNames(cmd.commands);
opts = opts || {};
if (opts.isDefault) this._defaultCommandName = cmd._name;
if (opts.noHelp || opts.hidden) cmd._hidden = true; // modifying passed command due to existing implementation
this.commands.push(cmd);
cmd.parent = this;
return this;
};
/**
* Define argument syntax for the command.
*
* @api public
*/
arguments(desc) {
return this._parseExpectedArgs(desc.split(/ +/));
};
/**
* Override default decision whether to add implicit help command.
*
* addHelpCommand() // force on
* addHelpCommand(false); // force off
* addHelpCommand('help [cmd]', 'display help for [cmd]'); // force on with custom details
*
* @return {Command} `this` command for chaining
* @api public
*/
addHelpCommand(enableOrNameAndArgs, description) {
if (enableOrNameAndArgs === false) {
this._hasImplicitHelpCommand = false;
} else {
this._hasImplicitHelpCommand = true;
if (typeof enableOrNameAndArgs === 'string') {
this._helpCommandName = enableOrNameAndArgs.split(' ')[0];
this._helpCommandnameAndArgs = enableOrNameAndArgs;
}
this._helpCommandDescription = description || this._helpCommandDescription;
}
return this;
};
/**
* @return {boolean}
* @api private
*/
_lazyHasImplicitHelpCommand() {
if (this._hasImplicitHelpCommand === undefined) {
this._hasImplicitHelpCommand = this.commands.length && !this._actionHandler && !this._findCommand('help');
}
return this._hasImplicitHelpCommand;
};
/**
* Parse expected `args`.
*
* For example `["[type]"]` becomes `[{ required: false, name: 'type' }]`.
*
* @param {Array} args
* @return {Command} `this` command for chaining
* @api private
*/
_parseExpectedArgs(args) {
if (!args.length) return;
args.forEach((arg) => {
const argDetails = {
required: false,
name: '',
variadic: false
};
switch (arg[0]) {
case '<':
argDetails.required = true;
argDetails.name = arg.slice(1, -1);
break;
case '[':
argDetails.name = arg.slice(1, -1);
break;
}
if (argDetails.name.length > 3 && argDetails.name.slice(-3) === '...') {
argDetails.variadic = true;
argDetails.name = argDetails.name.slice(0, -3);
}
if (argDetails.name) {
this._args.push(argDetails);
}
});
this._args.forEach((arg, i) => {
if (arg.variadic && i < this._args.length - 1) {
throw new Error(`only the last argument can be variadic '${arg.name}'`);
}
});
return this;
};
/**
* Register callback to use as replacement for calling process.exit.
*
* @param {Function} [fn] optional callback which will be passed a CommanderError, defaults to throwing
* @return {Command} `this` command for chaining
* @api public
*/
exitOverride(fn) {
if (fn) {
this._exitCallback = fn;
} else {
this._exitCallback = (err) => {
if (err.code !== 'commander.executeSubCommandAsync') {
throw err;
} else {
// Async callback from spawn events, not useful to throw.
}
};
}
return this;
};
/**
* Call process.exit, and _exitCallback if defined.
*
* @param {number} exitCode exit code for using with process.exit
* @param {string} code an id string representing the error
* @param {string} message human-readable description of the error
* @return never
* @api private
*/
_exit(exitCode, code, message) {
if (this._exitCallback) {
this._exitCallback(new CommanderError(exitCode, code, message));
// Expecting this line is not reached.
}
process.exit(exitCode);
};
/**
* Register callback `fn` for the command.
*
* Examples:
*
* program
* .command('help')
* .description('display verbose help')
* .action(function() {
* // output help here
* });
*
* @param {Function} fn
* @return {Command} `this` command for chaining
* @api public
*/
action(fn) {
const listener = (args) => {
// The .action callback takes an extra parameter which is the command or options.
const expectedArgsCount = this._args.length;
const actionArgs = args.slice(0, expectedArgsCount);
if (this._passCommandToAction) {
actionArgs[expectedArgsCount] = this;
} else {
actionArgs[expectedArgsCount] = this.opts();
}
// Add the extra arguments so available too.
if (args.length > expectedArgsCount) {
actionArgs.push(args.slice(expectedArgsCount));
}
const actionResult = fn.apply(this, actionArgs);
// Remember result in case it is async. Assume parseAsync getting called on root.
let rootCommand = this;
while (rootCommand.parent) {
rootCommand = rootCommand.parent;
}
rootCommand._actionResults.push(actionResult);
};
this._actionHandler = listener;
return this;
};
/**
* Internal routine to check whether there is a clash storing option value with a Command property.
*
* @param {Option} option
* @api private
*/
_checkForOptionNameClash(option) {
if (!this._storeOptionsAsProperties || this._storeOptionsAsPropertiesCalled) {
// Storing options safely, or user has been explicit and up to them.
return;
}
// User may override help, and hard to tell if worth warning.
if (option.name() === 'help') {
return;
}
const commandProperty = this._getOptionValue(option.attributeName());
if (commandProperty === undefined) {
// no clash
return;
}
let foundClash = true;
if (option.negate) {
// It is ok if define foo before --no-foo.
const positiveLongFlag = option.long.replace(/^--no-/, '--');
foundClash = !this._findOption(positiveLongFlag);
} else if (option.long) {
const negativeLongFlag = option.long.replace(/^--/, '--no-');
foundClash = !this._findOption(negativeLongFlag);
}
if (foundClash) {
throw new Error(`option '${option.name()}' clashes with existing property '${option.attributeName()}' on Command
- call storeOptionsAsProperties(false) to store option values safely,
- or call storeOptionsAsProperties(true) to suppress this check,
- or change option name
Read more on https://git.io/JJc0W`);
}
};
/**
* Internal implementation shared by .option() and .requiredOption()
*
* @param {Object} config
* @param {string} flags
* @param {string} description
* @param {Function|*} [fn] - custom option processing function or default value
* @param {*} [defaultValue]
* @return {Command} `this` command for chaining
* @api private
*/
_optionEx(config, flags, description, fn, defaultValue) {
const option = new Option(flags, description);
const oname = option.name();
const name = option.attributeName();
option.mandatory = !!config.mandatory;
this._checkForOptionNameClash(option);
// default as 3rd arg
if (typeof fn !== 'function') {
if (fn instanceof RegExp) {
// This is a bit simplistic (especially no error messages), and probably better handled by caller using custom option processing.
// No longer documented in README, but still present for backwards compatibility.
const regex = fn;
fn = (val, def) => {
const m = regex.exec(val);
return m ? m[0] : def;
};
} else {
defaultValue = fn;
fn = null;
}
}
// preassign default value for --no-*, [optional], <required>, or plain flag if boolean value
if (option.negate || option.optional || option.required || typeof defaultValue === 'boolean') {
// when --no-foo we make sure default is true, unless a --foo option is already defined
if (option.negate) {
const positiveLongFlag = option.long.replace(/^--no-/, '--');
defaultValue = this._findOption(positiveLongFlag) ? this._getOptionValue(name) : true;
}
// preassign only if we have a default
if (defaultValue !== undefined) {
this._setOptionValue(name, defaultValue);
option.defaultValue = defaultValue;
}
}
// register the option
this.options.push(option);
// when it's passed assign the value
// and conditionally invoke the callback
this.on('option:' + oname, (val) => {
const oldValue = this._getOptionValue(name);
// custom processing
if (val !== null && fn) {
val = fn(val, oldValue === undefined ? defaultValue : oldValue);
} else if (val !== null && option.variadic) {
if (oldValue === defaultValue || !Array.isArray(oldValue)) {
val = [val];
} else {
val = oldValue.concat(val);
}
}
// unassigned or boolean value
if (typeof oldValue === 'boolean' || typeof oldValue === 'undefined') {
// if no value, negate false, and we have a default, then use it!
if (val == null) {
this._setOptionValue(name, option.negate
? false
: defaultValue || true);
} else {
this._setOptionValue(name, val);
}
} else if (val !== null) {
// reassign
this._setOptionValue(name, option.negate ? false : val);
}
});
return this;
};
/**
* Define option with `flags`, `description` and optional
* coercion `fn`.
*
* The `flags` string should contain both the short and long flags,
* separated by comma, a pipe or space. The following are all valid
* all will output this way when `--help` is used.
*
* "-p, --pepper"
* "-p|--pepper"
* "-p --pepper"
*
* Examples:
*
* // simple boolean defaulting to undefined
* program.option('-p, --pepper', 'add pepper');
*
* program.pepper
* // => undefined
*
* --pepper
* program.pepper
* // => true
*
* // simple boolean defaulting to true (unless non-negated option is also defined)
* program.option('-C, --no-cheese', 'remove cheese');
*
* program.cheese
* // => true
*
* --no-cheese
* program.cheese
* // => false
*
* // required argument
* program.option('-C, --chdir <path>', 'change the working directory');
*
* --chdir /tmp
* program.chdir
* // => "/tmp"
*
* // optional argument
* program.option('-c, --cheese [type]', 'add cheese [marble]');
*
* @param {string} flags
* @param {string} description
* @param {Function|*} [fn] - custom option processing function or default value
* @param {*} [defaultValue]
* @return {Command} `this` command for chaining
* @api public
*/
option(flags, description, fn, defaultValue) {
return this._optionEx({}, flags, description, fn, defaultValue);
};
/**
* Add a required option which must have a value after parsing. This usually means
* the option must be specified on the command line. (Otherwise the same as .option().)
*
* The `flags` string should contain both the short and long flags, separated by comma, a pipe or space.
*
* @param {string} flags
* @param {string} description
* @param {Function|*} [fn] - custom option processing function or default value
* @param {*} [defaultValue]
* @return {Command} `this` command for chaining
* @api public
*/
requiredOption(flags, description, fn, defaultValue) {
return this._optionEx({ mandatory: true }, flags, description, fn, defaultValue);
};
/**
* Alter parsing of short flags with optional values.
*
* Examples:
*
* // for `.option('-f,--flag [value]'):
* .combineFlagAndOptionalValue(true) // `-f80` is treated like `--flag=80`, this is the default behaviour
* .combineFlagAndOptionalValue(false) // `-fb` is treated like `-f -b`
*
* @param {Boolean} [arg] - if `true` or omitted, an optional value can be specified directly after the flag.
* @api public
*/
combineFlagAndOptionalValue(arg) {
this._combineFlagAndOptionalValue = (arg === undefined) || arg;
return this;
};
/**
* Allow unknown options on the command line.
*
* @param {Boolean} [arg] - if `true` or omitted, no error will be thrown
* for unknown options.
* @api public
*/
allowUnknownOption(arg) {
this._allowUnknownOption = (arg === undefined) || arg;
return this;
};
/**
* Whether to store option values as properties on command object,
* or store separately (specify false). In both cases the option values can be accessed using .opts().
*
* @param {boolean} value
* @return {Command} `this` command for chaining
* @api public
*/
storeOptionsAsProperties(value) {
this._storeOptionsAsPropertiesCalled = true;
this._storeOptionsAsProperties = (value === undefined) || value;
if (this.options.length) {
throw new Error('call .storeOptionsAsProperties() before adding options');
}
return this;
};
/**
* Whether to pass command to action handler,
* or just the options (specify false).
*
* @param {boolean} value
* @return {Command} `this` command for chaining
* @api public
*/
passCommandToAction(value) {
this._passCommandToAction = (value === undefined) || value;
return this;
};
/**
* Store option value
*
* @param {string} key
* @param {Object} value
* @api private
*/
_setOptionValue(key, value) {
if (this._storeOptionsAsProperties) {
this[key] = value;
} else {
this._optionValues[key] = value;
}
};
/**
* Retrieve option value
*
* @param {string} key
* @return {Object} value
* @api private
*/
_getOptionValue(key) {
if (this._storeOptionsAsProperties) {
return this[key];
}
return this._optionValues[key];
};
/**
* Parse `argv`, setting options and invoking commands when defined.
*
* The default expectation is that the arguments are from node and have the application as argv[0]
* and the script being run in argv[1], with user parameters after that.
*
* Examples:
*
* program.parse(process.argv);
* program.parse(); // implicitly use process.argv and auto-detect node vs electron conventions
* program.parse(my-args, { from: 'user' }); // just user supplied arguments, nothing special about argv[0]
*
* @param {string[]} [argv] - optional, defaults to process.argv
* @param {Object} [parseOptions] - optionally specify style of options with from: node/user/electron
* @param {string} [parseOptions.from] - where the args are from: 'node', 'user', 'electron'
* @return {Command} `this` command for chaining
* @api public
*/
parse(argv, parseOptions) {
if (argv !== undefined && !Array.isArray(argv)) {
throw new Error('first parameter to parse must be array or undefined');
}
parseOptions = parseOptions || {};
// Default to using process.argv
if (argv === undefined) {
argv = process.argv;
// @ts-ignore
if (process.versions && process.versions.electron) {
parseOptions.from = 'electron';
}
}
this.rawArgs = argv.slice();
// make it a little easier for callers by supporting various argv conventions
let userArgs;
switch (parseOptions.from) {
case undefined:
case 'node':
this._scriptPath = argv[1];
userArgs = argv.slice(2);
break;
case 'electron':
// @ts-ignore
if (process.defaultApp) {
this._scriptPath = argv[1];
userArgs = argv.slice(2);
} else {
userArgs = argv.slice(1);
}
break;
case 'user':
userArgs = argv.slice(0);
break;
default:
throw new Error(`unexpected parse option { from: '${parseOptions.from}' }`);
}
if (!this._scriptPath && process.mainModule) {
this._scriptPath = process.mainModule.filename;
}
// Guess name, used in usage in help.
this._name = this._name || (this._scriptPath && path.basename(this._scriptPath, path.extname(this._scriptPath)));
// Let's go!
this._parseCommand([], userArgs);
return this;
};
/**
* Parse `argv`, setting options and invoking commands when defined.
*
* Use parseAsync instead of parse if any of your action handlers are async. Returns a Promise.
*
* The default expectation is that the arguments are from node and have the application as argv[0]
* and the script being run in argv[1], with user parameters after that.
*
* Examples:
*
* program.parseAsync(process.argv);
* program.parseAsync(); // implicitly use process.argv and auto-detect node vs electron conventions
* program.parseAsync(my-args, { from: 'user' }); // just user supplied arguments, nothing special about argv[0]
*
* @param {string[]} [argv]
* @param {Object} [parseOptions]
* @param {string} parseOptions.from - where the args are from: 'node', 'user', 'electron'
* @return {Promise}
* @api public
*/
parseAsync(argv, parseOptions) {
this.parse(argv, parseOptions);
return Promise.all(this._actionResults).then(() => this);
};
/**
* Execute a sub-command executable.
*
* @api private
*/
_executeSubCommand(subcommand, args) {
args = args.slice();
let launchWithNode = false; // Use node for source targets so do not need to get permissions correct, and on Windows.
const sourceExt = ['.js', '.ts', '.tsx', '.mjs'];
// Not checking for help first. Unlikely to have mandatory and executable, and can't robustly test for help flags in external command.
this._checkForMissingMandatoryOptions();
// Want the entry script as the reference for command name and directory for searching for other files.
let scriptPath = this._scriptPath;
// Fallback in case not set, due to how Command created or called.
if (!scriptPath && process.mainModule) {
scriptPath = process.mainModule.filename;
}
let baseDir;
try {
const resolvedLink = fs.realpathSync(scriptPath);
baseDir = path.dirname(resolvedLink);
} catch (e) {
baseDir = '.'; // dummy, probably not going to find executable!
}
// name of the subcommand, like `pm-install`
let bin = path.basename(scriptPath, path.extname(scriptPath)) + '-' + subcommand._name;
if (subcommand._executableFile) {
bin = subcommand._executableFile;
}
const localBin = path.join(baseDir, bin);
if (fs.existsSync(localBin)) {
// prefer local `./<bin>` to bin in the $PATH
bin = localBin;
} else {
// Look for source files.
sourceExt.forEach((ext) => {
if (fs.existsSync(`${localBin}${ext}`)) {
bin = `${localBin}${ext}`;
}
});
}
launchWithNode = sourceExt.includes(path.extname(bin));
let proc;
if (process.platform !== 'win32') {
if (launchWithNode) {
args.unshift(bin);
// add executable arguments to spawn
args = incrementNodeInspectorPort(process.execArgv).concat(args);
proc = spawn(process.argv[0], args, { stdio: 'inherit' });
} else {
proc = spawn(bin, args, { stdio: 'inherit' });
}
} else {
args.unshift(bin);
// add executable arguments to spawn
args = incrementNodeInspectorPort(process.execArgv).concat(args);
proc = spawn(process.execPath, args, { stdio: 'inherit' });
}
const signals = ['SIGUSR1', 'SIGUSR2', 'SIGTERM', 'SIGINT', 'SIGHUP'];
signals.forEach((signal) => {
// @ts-ignore
process.on(signal, () => {
if (proc.killed === false && proc.exitCode === null) {
proc.kill(signal);
}
});
});
// By default terminate process when spawned process terminates.
// Suppressing the exit if exitCallback defined is a bit messy and of limited use, but does allow process to stay running!
const exitCallback = this._exitCallback;
if (!exitCallback) {
proc.on('close', process.exit.bind(process));
} else {
proc.on('close', () => {
exitCallback(new CommanderError(process.exitCode || 0, 'commander.executeSubCommandAsync', '(close)'));
});
}
proc.on('error', (err) => {
// @ts-ignore
if (err.code === 'ENOENT') {
const executableMissing = `'${bin}' does not exist
- if '${subcommand._name}' is not meant to be an executable command, remove description parameter from '.command()' and use '.description()' instead
- if the default executable name is not suitable, use the executableFile option to supply a custom name`;
throw new Error(executableMissing);
// @ts-ignore
} else if (err.code === 'EACCES') {
throw new Error(`'${bin}' not executable`);
}
if (!exitCallback) {
process.exit(1);
} else {
const wrappedError = new CommanderError(1, 'commander.executeSubCommandAsync', '(error)');
wrappedError.nestedError = err;
exitCallback(wrappedError);
}
});
// Store the reference to the child process
this.runningCommand = proc;
};
/**
* @api private
*/
_dispatchSubcommand(commandName, operands, unknown) {
const subCommand = this._findCommand(commandName);
if (!subCommand) this._helpAndError();
if (subCommand._executableHandler) {
this._executeSubCommand(subCommand, operands.concat(unknown));
} else {
subCommand._parseCommand(operands, unknown);
}
};
/**
* Process arguments in context of this command.
*
* @api private
*/
_parseCommand(operands, unknown) {
const parsed = this.parseOptions(unknown);
operands = operands.concat(parsed.operands);
unknown = parsed.unknown;
this.args = operands.concat(unknown);
if (operands && this._findCommand(operands[0])) {
this._dispatchSubcommand(operands[0], operands.slice(1), unknown);
} else if (this._lazyHasImplicitHelpCommand() && operands[0] === this._helpCommandName) {
if (operands.length === 1) {
this.help();
} else {
this._dispatchSubcommand(operands[1], [], [this._helpLongFlag]);
}
} else if (this._defaultCommandName) {
outputHelpIfRequested(this, unknown); // Run the help for default command from parent rather than passing to default command
this._dispatchSubcommand(this._defaultCommandName, operands, unknown);
} else {
if (this.commands.length && this.args.length === 0 && !this._actionHandler && !this._defaultCommandName) {
// probably missing subcommand and no handler, user needs help
this._helpAndError();
}
outputHelpIfRequested(this, parsed.unknown);
this._checkForMissingMandatoryOptions();
if (parsed.unknown.length > 0) {
this.unknownOption(parsed.unknown[0]);
}
if (this._actionHandler) {
const args = this.args.slice();
this._args.forEach((arg, i) => {
if (arg.required && args[i] == null) {
this.missingArgument(arg.name);
} else if (arg.variadic) {
args[i] = args.splice(i);
}
});
this._actionHandler(args);
this.emit('command:' + this.name(), operands, unknown);
} else if (operands.length) {
if (this._findCommand('*')) {
this._dispatchSubcommand('*', operands, unknown);
} else if (this.listenerCount('command:*')) {
this.emit('command:*', operands, unknown);
} else if (this.commands.length) {
this.unknownCommand();
}
} else if (this.commands.length) {
// This command has subcommands and nothing hooked up at this level, so display help.
this._helpAndError();
} else {
// fall through for caller to handle after calling .parse()
}
}
};
/**
* Find matching command.
*
* @api private
*/
_findCommand(name) {
if (!name) return undefined;
return this.commands.find(cmd => cmd._name === name || cmd._aliases.includes(name));
};
/**
* Return an option matching `arg` if any.
*
* @param {string} arg
* @return {Option}
* @api private
*/
_findOption(arg) {
return this.options.find(option => option.is(arg));
};
/**
* Display an error message if a mandatory option does not have a value.
* Lazy calling after checking for help flags from leaf subcommand.
*
* @api private
*/
_checkForMissingMandatoryOptions() {
// Walk up hierarchy so can call in subcommand after checking for displaying help.
for (let cmd = this; cmd; cmd = cmd.parent) {
cmd.options.forEach((anOption) => {
if (anOption.mandatory && (cmd._getOptionValue(anOption.attributeName()) === undefined)) {
cmd.missingMandatoryOptionValue(anOption);
}
});
}
};
/**
* Parse options from `argv` removing known options,
* and return argv split into operands and unknown arguments.
*
* Examples:
*
* argv => operands, unknown
* --known kkk op => [op], []
* op --known kkk => [op], []
* sub --unknown uuu op => [sub], [--unknown uuu op]
* sub -- --unknown uuu op => [sub --unknown uuu op], []
*
* @param {String[]} argv
* @return {{operands: String[], unknown: String[]}}
* @api public
*/
parseOptions(argv) {
const operands = []; // operands, not options or values
const unknown = []; // first unknown option and remaining unknown args
let dest = operands;
const args = argv.slice();
function maybeOption(arg) {
return arg.length > 1 && arg[0] === '-';
}
// parse options
let activeVariadicOption = null;
while (args.length) {
const arg = args.shift();
// literal
if (arg === '--') {
if (dest === unknown) dest.push(arg);
dest.push(...args);
break;
}
if (activeVariadicOption && !maybeOption(arg)) {
this.emit(`option:${activeVariadicOption.name()}`, arg);
continue;
}
activeVariadicOption = null;
if (maybeOption(arg)) {
const option = this._findOption(arg);
// recognised option, call listener to assign value with possible custom processing
if (option) {
if (option.required) {
const value = args.shift();
if (value === undefined) this.optionMissingArgument(option);
this.emit(`option:${option.name()}`, value);
} else if (option.optional) {
let value = null;
// historical behaviour is optional value is following arg unless an option
if (args.length > 0 && !maybeOption(args[0])) {
value = args.shift();
}
this.emit(`option:${option.name()}`, value);
} else { // boolean flag
this.emit(`option:${option.name()}`);
}
activeVariadicOption = option.variadic ? option : null;
continue;
}
}
// Look for combo options following single dash, eat first one if known.
if (arg.length > 2 && arg[0] === '-' && arg[1] !== '-') {
const option = this._findOption(`-${arg[1]}`);
if (option) {
if (option.required || (option.optional && this._combineFlagAndOptionalValue)) {
// option with value following in same argument
this.emit(`option:${option.name()}`, arg.slice(2));
} else {
// boolean option, emit and put back remainder of arg for further processing
this.emit(`option:${option.name()}`);
args.unshift(`-${arg.slice(2)}`);
}
continue;
}
}
// Look for known long flag with value, like --foo=bar
if (/^--[^=]+=/.test(arg)) {
const index = arg.indexOf('=');
const option = this._findOption(arg.slice(0, index));
if (option && (option.required || option.optional)) {
this.emit(`option:${option.name()}`, arg.slice(index + 1));
continue;
}
}
// looks like an option but unknown, unknowns from here
if (arg.length > 1 && arg[0] === '-') {
dest = unknown;
}
// add arg
dest.push(arg);
}
return { operands, unknown };
};
/**
* Return an object containing options as key-value pairs
*
* @return {Object}
* @api public
*/
opts() {
if (this._storeOptionsAsProperties) {
// Preserve original behaviour so backwards compatible when still using properties
const result = {};
const len = this.options.length;
for (let i = 0; i < len; i++) {
const key = this.options[i].attributeName();
result[key] = key === this._versionOptionName ? this._version : this[key];
}
return result;
}
return this._optionValues;
};
/**
* Argument `name` is missing.
*
* @param {string} name
* @api private
*/
missingArgument(name) {
const message = `error: missing required argument '${name}'`;
console.error(message);
this._exit(1, 'commander.missingArgument', message);
};
/**
* `Option` is missing an argument, but received `flag` or nothing.
*
* @param {Option} option
* @param {string} [flag]
* @api private
*/
optionMissingArgument(option, flag) {
let message;
if (flag) {
message = `error: option '${option.flags}' argument missing, got '${flag}'`;
} else {
message = `error: option '${option.flags}' argument missing`;
}
console.error(message);
this._exit(1, 'commander.optionMissingArgument', message);
};
/**
* `Option` does not have a value, and is a mandatory option.
*
* @param {Option} option
* @api private
*/
missingMandatoryOptionValue(option) {
const message = `error: required option '${option.flags}' not specified`;
console.error(message);
this._exit(1, 'commander.missingMandatoryOptionValue', message);
};
/**
* Unknown option `flag`.
*
* @param {string} flag
* @api private
*/
unknownOption(flag) {
if (this._allowUnknownOption) return;
const message = `error: unknown option '${flag}'`;
console.error(message);
this._exit(1, 'commander.unknownOption', message);
};
/**
* Unknown command.
*
* @api private
*/
unknownCommand() {
const partCommands = [this.name()];
for (let parentCmd = this.parent; parentCmd; parentCmd = parentCmd.parent) {
partCommands.unshift(parentCmd.name());
}
const fullCommand = partCommands.join(' ');
const message = `error: unknown command '${this.args[0]}'.` +
(this._hasHelpOption ? ` See '${fullCommand} ${this._helpLongFlag}'.` : '');
console.error(message);
this._exit(1, 'commander.unknownCommand', message);
};
/**
* Set the program version to `str`.
*
* This method auto-registers the "-V, --version" flag
* which will print the version number when passed.
*
* You can optionally supply the flags and description to override the defaults.
*
* @param {string} str
* @param {string} [flags]
* @param {string} [description]
* @return {this | string} `this` command for chaining, or version string if no arguments
* @api public
*/
version(str, flags, description) {
if (str === undefined) return this._version;
this._version = str;
flags = flags || '-V, --version';
description = description || 'output the version number';
const versionOption = new Option(flags, description);
this._versionOptionName = versionOption.attributeName();
this.options.push(versionOption);
this.on('option:' + versionOption.name(), () => {
process.stdout.write(str + '\n');
this._exit(0, 'commander.version', str);
});
return this;
};
/**
* Set the description to `str`.
*
* @param {string} str
* @param {Object} [argsDescription]
* @return {string|Command}
* @api public
*/
description(str, argsDescription) {
if (str === undefined && argsDescription === undefined) return this._description;
this._description = str;
this._argsDescription = argsDescription;
return this;
};
/**
* Set an alias for the command.
*
* You may call more than once to add multiple aliases. Only the first alias is shown in the auto-generated help.
*
* @param {string} [alias]
* @return {string|Command}
* @api public
*/
alias(alias) {
if (alias === undefined) return this._aliases[0]; // just return first, for backwards compatibility
let command = this;
if (this.commands.length !== 0 && this.commands[this.commands.length - 1]._executableHandler) {
// assume adding alias for last added executable subcommand, rather than this
command = this.commands[this.commands.length - 1];
}
if (alias === command._name) throw new Error('Command alias can\'t be the same as its name');
command._aliases.push(alias);
return this;
};
/**
* Set aliases for the command.
*
* Only the first alias is shown in the auto-generated help.
*
* @param {string[]} [aliases]
* @return {string[]|Command}
* @api public
*/
aliases(aliases) {
// Getter for the array of aliases is the main reason for having aliases() in addition to alias().
if (aliases === undefined) return this._aliases;
aliases.forEach((alias) => this.alias(alias));
return this;
};
/**
* Set / get the command usage `str`.
*
* @param {string} [str]
* @return {String|Command}
* @api public
*/
usage(str) {
if (str === undefined) {
if (this._usage) return this._usage;
const args = this._args.map((arg) => {
return humanReadableArgName(arg);
});
return [].concat(
(this.options.length || this._hasHelpOption ? '[options]' : []),
(this.commands.length ? '[command]' : []),
(this._args.length ? args : [])
).join(' ');
}
this._usage = str;
return this;
};
/**
* Get or set the name of the command
*
* @param {string} [str]
* @return {String|Command}
* @api public
*/
name(str) {
if (str === undefined) return this._name;
this._name = str;
return this;
};
/**
* Return prepared commands.
*
* @return {Array}
* @api private
*/
prepareCommands() {
const commandDetails = this.commands.filter((cmd) => {
return !cmd._hidden;
}).map((cmd) => {
const args = cmd._args.map((arg) => {
return humanReadableArgName(arg);
}).join(' ');
return [
cmd._name +
(cmd._aliases[0] ? '|' + cmd._aliases[0] : '') +
(cmd.options.length ? ' [options]' : '') +
(args ? ' ' + args : ''),
cmd._description
];
});
if (this._lazyHasImplicitHelpCommand()) {
commandDetails.push([this._helpCommandnameAndArgs, this._helpCommandDescription]);
}
return commandDetails;
};
/**
* Return the largest command length.
*
* @return {number}
* @api private
*/
largestCommandLength() {
const commands = this.prepareCommands();
return commands.reduce((max, command) => {
return Math.max(max, command[0].length);
}, 0);
};
/**
* Return the largest option length.
*
* @return {number}
* @api private
*/
largestOptionLength() {
const options = [].slice.call(this.options);
options.push({
flags: this._helpFlags
});
return options.reduce((max, option) => {
return Math.max(max, option.flags.length);
}, 0);
};
/**
* Return the largest arg length.
*
* @return {number}
* @api private
*/
largestArgLength() {
return this._args.reduce((max, arg) => {
return Math.max(max, arg.name.length);
}, 0);
};
/**
* Return the pad width.
*
* @return {number}
* @api private
*/
padWidth() {
let width = this.largestOptionLength();
if (this._argsDescription && this._args.length) {
if (this.largestArgLength() > width) {
width = this.largestArgLength();
}
}
if (this.commands && this.commands.length) {
if (this.largestCommandLength() > width) {
width = this.largestCommandLength();
}
}
return width;
};
/**
* Return help for options.
*
* @return {string}
* @api private
*/
optionHelp() {
const width = this.padWidth();
const columns = process.stdout.columns || 80;
const descriptionWidth = columns - width - 4;
function padOptionDetails(flags, description) {
return pad(flags, width) + ' ' + optionalWrap(description, descriptionWidth, width + 2);
};
// Explicit options (including version)
const help = this.options.map((option) => {
const fullDesc = option.description +
((!option.negate && option.defaultValue !== undefined) ? ' (default: ' + JSON.stringify(option.defaultValue) + ')' : '');
return padOptionDetails(option.flags, fullDesc);
});
// Implicit help
const showShortHelpFlag = this._hasHelpOption && this._helpShortFlag && !this._findOption(this._helpShortFlag);
const showLongHelpFlag = this._hasHelpOption && !this._findOption(this._helpLongFlag);
if (showShortHelpFlag || showLongHelpFlag) {
let helpFlags = this._helpFlags;
if (!showShortHelpFlag) {
helpFlags = this._helpLongFlag;
} else if (!showLongHelpFlag) {
helpFlags = this._helpShortFlag;
}
help.push(padOptionDetails(helpFlags, this._helpDescription));
}
return help.join('\n');
};
/**
* Return command help documentation.
*
* @return {string}
* @api private
*/
commandHelp() {
if (!this.commands.length && !this._lazyHasImplicitHelpCommand()) return '';
const commands = this.prepareCommands();
const width = this.padWidth();
const columns = process.stdout.columns || 80;
const descriptionWidth = columns - width - 4;
return [
'Commands:',
commands.map((cmd) => {
const desc = cmd[1] ? ' ' + cmd[1] : '';
return (desc ? pad(cmd[0], width) : cmd[0]) + optionalWrap(desc, descriptionWidth, width + 2);
}).join('\n').replace(/^/gm, ' '),
''
].join('\n');
};
/**
* Return program help documentation.
*
* @return {string}
* @api public
*/
helpInformation() {
let desc = [];
if (this._description) {
desc = [
this._description,
''
];
const argsDescription = this._argsDescription;
if (argsDescription && this._args.length) {
const width = this.padWidth();
const columns = process.stdout.columns || 80;
const descriptionWidth = columns - width - 5;
desc.push('Arguments:');
this._args.forEach((arg) => {
desc.push(' ' + pad(arg.name, width) + ' ' + wrap(argsDescription[arg.name] || '', descriptionWidth, width + 4));
});
desc.push('');
}
}
let cmdName = this._name;
if (this._aliases[0]) {
cmdName = cmdName + '|' + this._aliases[0];
}
let parentCmdNames = '';
for (let parentCmd = this.parent; parentCmd; parentCmd = parentCmd.parent) {
parentCmdNames = parentCmd.name() + ' ' + parentCmdNames;
}
const usage = [
'Usage: ' + parentCmdNames + cmdName + ' ' + this.usage(),
''
];
let cmds = [];
const commandHelp = this.commandHelp();
if (commandHelp) cmds = [commandHelp];
let options = [];
if (this._hasHelpOption || this.options.length > 0) {
options = [
'Options:',
'' + this.optionHelp().replace(/^/gm, ' '),
''
];
}
return usage
.concat(desc)
.concat(options)
.concat(cmds)
.join('\n');
};
/**
* Output help information for this command.
*
* When listener(s) are available for the helpLongFlag
* those callbacks are invoked.
*
* @api public
*/
outputHelp(cb) {
if (!cb) {
cb = (passthru) => {
return passthru;
};
}
const cbOutput = cb(this.helpInformation());
if (typeof cbOutput !== 'string' && !Buffer.isBuffer(cbOutput)) {
throw new Error('outputHelp callback must return a string or a Buffer');
}
process.stdout.write(cbOutput);
this.emit(this._helpLongFlag);
};
/**
* You can pass in flags and a description to override the help
* flags and help description for your command. Pass in false to
* disable the built-in help option.
*
* @param {string | boolean} [flags]
* @param {string} [description]
* @return {Command} `this` command for chaining
* @api public
*/
helpOption(flags, description) {
if (typeof flags === 'boolean') {
this._hasHelpOption = flags;
return this;
}
this._helpFlags = flags || this._helpFlags;
this._helpDescription = description || this._helpDescription;
const helpFlags = _parseOptionFlags(this._helpFlags);
this._helpShortFlag = helpFlags.shortFlag;
this._helpLongFlag = helpFlags.longFlag;
return this;
};
/**
* Output help information and exit.
*
* @param {Function} [cb]
* @api public
*/
help(cb) {
this.outputHelp(cb);
// exitCode: preserving original behaviour which was calling process.exit()
// message: do not have all displayed text available so only passing placeholder.
this._exit(process.exitCode || 0, 'commander.help', '(outputHelp)');
};
/**
* Output help information and exit. Display for error situations.
*
* @api private
*/
_helpAndError() {
this.outputHelp();
// message: do not have all displayed text available so only passing placeholder.
this._exit(1, 'commander.help', '(outputHelp)');
};
};
/**
* Expose the root command.
*/
exports = module.exports = new Command();
exports.program = exports; // More explicit access to global command.
/**
* Expose classes
*/
exports.Command = Command;
exports.Option = Option;
exports.CommanderError = CommanderError;
/**
* Camel-case the given `flag`
*
* @param {string} flag
* @return {string}
* @api private
*/
function camelcase(flag) {
return flag.split('-').reduce((str, word) => {
return str + word[0].toUpperCase() + word.slice(1);
});
}
/**
* Pad `str` to `width`.
*
* @param {string} str
* @param {number} width
* @return {string}
* @api private
*/
function pad(str, width) {
const len = Math.max(0, width - str.length);
return str + Array(len + 1).join(' ');
}
/**
* Wraps the given string with line breaks at the specified width while breaking
* words and indenting every but the first line on the left.
*
* @param {string} str
* @param {number} width
* @param {number} indent
* @return {string}
* @api private
*/
function wrap(str, width, indent) {
const regex = new RegExp('.{1,' + (width - 1) + '}([\\s\u200B]|$)|[^\\s\u200B]+?([\\s\u200B]|$)', 'g');
const lines = str.match(regex) || [];
return lines.map((line, i) => {
if (line.slice(-1) === '\n') {
line = line.slice(0, line.length - 1);
}
return ((i > 0 && indent) ? Array(indent + 1).join(' ') : '') + line.trimRight();
}).join('\n');
}
/**
* Optionally wrap the given str to a max width of width characters per line
* while indenting with indent spaces. Do not wrap if insufficient width or
* string is manually formatted.
*
* @param {string} str
* @param {number} width
* @param {number} indent
* @return {string}
* @api private
*/
function optionalWrap(str, width, indent) {
// Detect manually wrapped and indented strings by searching for line breaks
// followed by multiple spaces/tabs.
if (str.match(/[\n]\s+/)) return str;
// Do not wrap to narrow columns (or can end up with a word per line).
const minWidth = 40;
if (width < minWidth) return str;
return wrap(str, width, indent);
}
/**
* Output help information if help flags specified
*
* @param {Command} cmd - command to output help for
* @param {Array} args - array of options to search for help flags
* @api private
*/
function outputHelpIfRequested(cmd, args) {
const helpOption = cmd._hasHelpOption && args.find(arg => arg === cmd._helpLongFlag || arg === cmd._helpShortFlag);
if (helpOption) {
cmd.outputHelp();
// (Do not have all displayed text available so only passing placeholder.)
cmd._exit(0, 'commander.helpDisplayed', '(outputHelp)');
}
}
/**
* Takes an argument and returns its human readable equivalent for help usage.
*
* @param {Object} arg
* @return {string}
* @api private
*/
function humanReadableArgName(arg) {
const nameOutput = arg.name + (arg.variadic === true ? '...' : '');
return arg.required
? '<' + nameOutput + '>'
: '[' + nameOutput + ']';
}
/**
* Parse the short and long flag out of something like '-m,--mixed <value>'
*
* @api private
*/
function _parseOptionFlags(flags) {
let shortFlag;
let longFlag;
// Use original very loose parsing to maintain backwards compatibility for now,
// which allowed for example unintended `-sw, --short-word` [sic].
const flagParts = flags.split(/[ |,]+/);
if (flagParts.length > 1 && !/^[[<]/.test(flagParts[1])) shortFlag = flagParts.shift();
longFlag = flagParts.shift();
// Add support for lone short flag without significantly changing parsing!
if (!shortFlag && /^-[^-]$/.test(longFlag)) {
shortFlag = longFlag;
longFlag = undefined;
}
return { shortFlag, longFlag };
}
/**
* Scan arguments and increment port number for inspect calls (to avoid conflicts when spawning new command).
*
* @param {string[]} args - array of arguments from node.execArgv
* @returns {string[]}
* @api private
*/
function incrementNodeInspectorPort(args) {
// Testing for these options:
// --inspect[=[host:]port]
// --inspect-brk[=[host:]port]
// --inspect-port=[host:]port
return args.map((arg) => {
if (!arg.startsWith('--inspect')) {
return arg;
}
let debugOption;
let debugHost = '127.0.0.1';
let debugPort = '9229';
let match;
if ((match = arg.match(/^(--inspect(-brk)?)$/)) !== null) {
// e.g. --inspect
debugOption = match[1];
} else if ((match = arg.match(/^(--inspect(-brk|-port)?)=([^:]+)$/)) !== null) {
debugOption = match[1];
if (/^\d+$/.test(match[3])) {
// e.g. --inspect=1234
debugPort = match[3];
} else {
// e.g. --inspect=localhost
debugHost = match[3];
}
} else if ((match = arg.match(/^(--inspect(-brk|-port)?)=([^:]+):(\d+)$/)) !== null) {
// e.g. --inspect=localhost:1234
debugOption = match[1];
debugHost = match[3];
debugPort = match[4];
}
if (debugOption && debugPort !== '0') {
return `${debugOption}=${debugHost}:${parseInt(debugPort) + 1}`;
}
return arg;
});
}