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command.js
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Thu, Dec 12, 11:46

command.js
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const EventEmitter = require('events').EventEmitter;
const childProcess = require('child_process');
const path = require('path');
const fs = require('fs');
const { Argument, humanReadableArgName } = require('./argument.js');
const { CommanderError } = require('./error.js');
const { Help } = require('./help.js');
const { Option, splitOptionFlags } = require('./option.js');
const { suggestSimilar } = require('./suggestSimilar');
// @ts-check
class Command extends EventEmitter {
/**
* Initialize a new `Command`.
*
* @param {string} [name]
*/
constructor(name) {
super();
/** @type {Command[]} */
this.commands = [];
/** @type {Option[]} */
this.options = [];
this.parent = null;
this._allowUnknownOption = false;
this._allowExcessArguments = true;
/** @type {Argument[]} */
this._args = [];
/** @type {string[]} */
this.args = []; // cli args with options removed
this.rawArgs = [];
this.processedArgs = []; // like .args but after custom processing and collecting variadic
this._scriptPath = null;
this._name = name || '';
this._optionValues = {};
this._optionValueSources = {}; // default < config < env < cli
this._storeOptionsAsProperties = false;
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._description = '';
this._argsDescription = undefined; // legacy
this._enablePositionalOptions = false;
this._passThroughOptions = false;
this._lifeCycleHooks = {}; // a hash of arrays
/** @type {boolean | string} */
this._showHelpAfterError = false;
this._showSuggestionAfterError = false;
// see .configureOutput() for docs
this._outputConfiguration = {
writeOut: (str) => process.stdout.write(str),
writeErr: (str) => process.stderr.write(str),
getOutHelpWidth: () => process.stdout.isTTY ? process.stdout.columns : undefined,
getErrHelpWidth: () => process.stderr.isTTY ? process.stderr.columns : undefined,
outputError: (str, write) => write(str)
};
this._hidden = false;
this._hasHelpOption = true;
this._helpFlags = '-h, --help';
this._helpDescription = 'display help for command';
this._helpShortFlag = '-h';
this._helpLongFlag = '--help';
this._addImplicitHelpCommand = undefined; // Deliberately undefined, not decided whether true or false
this._helpCommandName = 'help';
this._helpCommandnameAndArgs = 'help [command]';
this._helpCommandDescription = 'display help for command';
this._helpConfiguration = {};
}
/**
* Copy settings that are useful to have in common across root command and subcommands.
*
* (Used internally when adding a command using `.command()` so subcommands inherit parent settings.)
*
* @param {Command} sourceCommand
* @return {Command} returns `this` for executable command
*/
copyInheritedSettings(sourceCommand) {
this._outputConfiguration = sourceCommand._outputConfiguration;
this._hasHelpOption = sourceCommand._hasHelpOption;
this._helpFlags = sourceCommand._helpFlags;
this._helpDescription = sourceCommand._helpDescription;
this._helpShortFlag = sourceCommand._helpShortFlag;
this._helpLongFlag = sourceCommand._helpLongFlag;
this._helpCommandName = sourceCommand._helpCommandName;
this._helpCommandnameAndArgs = sourceCommand._helpCommandnameAndArgs;
this._helpCommandDescription = sourceCommand._helpCommandDescription;
this._helpConfiguration = sourceCommand._helpConfiguration;
this._exitCallback = sourceCommand._exitCallback;
this._storeOptionsAsProperties = sourceCommand._storeOptionsAsProperties;
this._combineFlagAndOptionalValue = sourceCommand._combineFlagAndOptionalValue;
this._allowExcessArguments = sourceCommand._allowExcessArguments;
this._enablePositionalOptions = sourceCommand._enablePositionalOptions;
this._showHelpAfterError = sourceCommand._showHelpAfterError;
this._showSuggestionAfterError = sourceCommand._showSuggestionAfterError;
return this;
}
/**
* Define a command.
*
* There are two styles of command: pay attention to where to put the description.
*
* @example
* // 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
*/
command(nameAndArgs, actionOptsOrExecDesc, execOpts) {
let desc = actionOptsOrExecDesc;
let opts = execOpts;
if (typeof desc === 'object' && desc !== null) {
opts = desc;
desc = null;
}
opts = opts || {};
const [, name, args] = nameAndArgs.match(/([^ ]+) *(.*)/);
const cmd = this.createCommand(name);
if (desc) {
cmd.description(desc);
cmd._executableHandler = true;
}
if (opts.isDefault) this._defaultCommandName = cmd._name;
cmd._hidden = !!(opts.noHelp || opts.hidden); // noHelp is deprecated old name for hidden
cmd._executableFile = opts.executableFile || null; // Custom name for executable file, set missing to null to match constructor
if (args) cmd.arguments(args);
this.commands.push(cmd);
cmd.parent = this;
cmd.copyInheritedSettings(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
*/
createCommand(name) {
return new Command(name);
};
/**
* You can customise the help with a subclass of Help by overriding createHelp,
* or by overriding Help properties using configureHelp().
*
* @return {Help}
*/
createHelp() {
return Object.assign(new Help(), this.configureHelp());
};
/**
* You can customise the help by overriding Help properties using configureHelp(),
* or with a subclass of Help by overriding createHelp().
*
* @param {Object} [configuration] - configuration options
* @return {Command|Object} `this` command for chaining, or stored configuration
*/
configureHelp(configuration) {
if (configuration === undefined) return this._helpConfiguration;
this._helpConfiguration = configuration;
return this;
}
/**
* The default output goes to stdout and stderr. You can customise this for special
* applications. You can also customise the display of errors by overriding outputError.
*
* The configuration properties are all functions:
*
* // functions to change where being written, stdout and stderr
* writeOut(str)
* writeErr(str)
* // matching functions to specify width for wrapping help
* getOutHelpWidth()
* getErrHelpWidth()
* // functions based on what is being written out
* outputError(str, write) // used for displaying errors, and not used for displaying help
*
* @param {Object} [configuration] - configuration options
* @return {Command|Object} `this` command for chaining, or stored configuration
*/
configureOutput(configuration) {
if (configuration === undefined) return this._outputConfiguration;
Object.assign(this._outputConfiguration, configuration);
return this;
}
/**
* Display the help or a custom message after an error occurs.
*
* @param {boolean|string} [displayHelp]
* @return {Command} `this` command for chaining
*/
showHelpAfterError(displayHelp = true) {
if (typeof displayHelp !== 'string') displayHelp = !!displayHelp;
this._showHelpAfterError = displayHelp;
return this;
}
/**
* Display suggestion of similar commands for unknown commands, or options for unknown options.
*
* @param {boolean} [displaySuggestion]
* @return {Command} `this` command for chaining
*/
showSuggestionAfterError(displaySuggestion = true) {
this._showSuggestionAfterError = !!displaySuggestion;
return this;
}
/**
* 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
*/
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;
};
/**
* Factory routine to create a new unattached argument.
*
* See .argument() for creating an attached argument, which uses this routine to
* create the argument. You can override createArgument to return a custom argument.
*
* @param {string} name
* @param {string} [description]
* @return {Argument} new argument
*/
createArgument(name, description) {
return new Argument(name, description);
};
/**
* Define argument syntax for command.
*
* The default is that the argument is required, and you can explicitly
* indicate this with <> around the name. Put [] around the name for an optional argument.
*
* @example
* program.argument('<input-file>');
* program.argument('[output-file]');
*
* @param {string} name
* @param {string} [description]
* @param {Function|*} [fn] - custom argument processing function
* @param {*} [defaultValue]
* @return {Command} `this` command for chaining
*/
argument(name, description, fn, defaultValue) {
const argument = this.createArgument(name, description);
if (typeof fn === 'function') {
argument.default(defaultValue).argParser(fn);
} else {
argument.default(fn);
}
this.addArgument(argument);
return this;
}
/**
* Define argument syntax for command, adding multiple at once (without descriptions).
*
* See also .argument().
*
* @example
* program.arguments('<cmd> [env]');
*
* @param {string} names
* @return {Command} `this` command for chaining
*/
arguments(names) {
names.split(/ +/).forEach((detail) => {
this.argument(detail);
});
return this;
};
/**
* Define argument syntax for command, adding a prepared argument.
*
* @param {Argument} argument
* @return {Command} `this` command for chaining
*/
addArgument(argument) {
const previousArgument = this._args.slice(-1)[0];
if (previousArgument && previousArgument.variadic) {
throw new Error(`only the last argument can be variadic '${previousArgument.name()}'`);
}
if (argument.required && argument.defaultValue !== undefined && argument.parseArg === undefined) {
throw new Error(`a default value for a required argument is never used: '${argument.name()}'`);
}
this._args.push(argument);
return this;
}
/**
* Override default decision whether to add implicit help command.
*
* addHelpCommand() // force on
* addHelpCommand(false); // force off
* addHelpCommand('help [cmd]', 'display help for [cmd]'); // force on with custom details
*
* @return {Command} `this` command for chaining
*/
addHelpCommand(enableOrNameAndArgs, description) {
if (enableOrNameAndArgs === false) {
this._addImplicitHelpCommand = false;
} else {
this._addImplicitHelpCommand = true;
if (typeof enableOrNameAndArgs === 'string') {
this._helpCommandName = enableOrNameAndArgs.split(' ')[0];
this._helpCommandnameAndArgs = enableOrNameAndArgs;
}
this._helpCommandDescription = description || this._helpCommandDescription;
}
return this;
};
/**
* @return {boolean}
* @api private
*/
_hasImplicitHelpCommand() {
if (this._addImplicitHelpCommand === undefined) {
return this.commands.length && !this._actionHandler && !this._findCommand('help');
}
return this._addImplicitHelpCommand;
};
/**
* Add hook for life cycle event.
*
* @param {string} event
* @param {Function} listener
* @return {Command} `this` command for chaining
*/
hook(event, listener) {
const allowedValues = ['preAction', 'postAction'];
if (!allowedValues.includes(event)) {
throw new Error(`Unexpected value for event passed to hook : '${event}'.
Expecting one of '${allowedValues.join("', '")}'`);
}
if (this._lifeCycleHooks[event]) {
this._lifeCycleHooks[event].push(listener);
} else {
this._lifeCycleHooks[event] = [listener];
}
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
*/
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.
*
* @example
* program
* .command('serve')
* .description('start service')
* .action(function() {
* // do work here
* });
*
* @param {Function} fn
* @return {Command} `this` command for chaining
*/
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._storeOptionsAsProperties) {
actionArgs[expectedArgsCount] = this; // backwards compatible "options"
} else {
actionArgs[expectedArgsCount] = this.opts();
}
actionArgs.push(this);
return fn.apply(this, actionArgs);
};
this._actionHandler = listener;
return this;
};
/**
* Factory routine to create a new unattached option.
*
* See .option() for creating an attached option, which uses this routine to
* create the option. You can override createOption to return a custom option.
*
* @param {string} flags
* @param {string} [description]
* @return {Option} new option
*/
createOption(flags, description) {
return new Option(flags, description);
};
/**
* Add an option.
*
* @param {Option} option
* @return {Command} `this` command for chaining
*/
addOption(option) {
const oname = option.name();
const name = option.attributeName();
let defaultValue = option.defaultValue;
// 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.setOptionValueWithSource(name, defaultValue, 'default');
}
}
// register the option
this.options.push(option);
// handler for cli and env supplied values
const handleOptionValue = (val, invalidValueMessage, valueSource) => {
// Note: using closure to access lots of lexical scoped variables.
const oldValue = this.getOptionValue(name);
// custom processing
if (val !== null && option.parseArg) {
try {
val = option.parseArg(val, oldValue === undefined ? defaultValue : oldValue);
} catch (err) {
if (err.code === 'commander.invalidArgument') {
const message = `${invalidValueMessage} ${err.message}`;
this._displayError(err.exitCode, err.code, message);
}
throw err;
}
} else if (val !== null && option.variadic) {
val = option._concatValue(val, oldValue);
}
// unassigned or boolean value
if (typeof oldValue === 'boolean' || typeof oldValue === 'undefined') {
// if no value, negate false, and we have a default, then use it!
if (val == null) {
this.setOptionValueWithSource(name, option.negate ? false : defaultValue || true, valueSource);
} else {
this.setOptionValueWithSource(name, val, valueSource);
}
} else if (val !== null) {
// reassign
this.setOptionValueWithSource(name, option.negate ? false : val, valueSource);
}
};
this.on('option:' + oname, (val) => {
const invalidValueMessage = `error: option '${option.flags}' argument '${val}' is invalid.`;
handleOptionValue(val, invalidValueMessage, 'cli');
});
if (option.envVar) {
this.on('optionEnv:' + oname, (val) => {
const invalidValueMessage = `error: option '${option.flags}' value '${val}' from env '${option.envVar}' is invalid.`;
handleOptionValue(val, invalidValueMessage, 'env');
});
}
return this;
}
/**
* Internal implementation shared by .option() and .requiredOption()
*
* @api private
*/
_optionEx(config, flags, description, fn, defaultValue) {
const option = this.createOption(flags, description);
option.makeOptionMandatory(!!config.mandatory);
if (typeof fn === 'function') {
option.default(defaultValue).argParser(fn);
} else if (fn instanceof RegExp) {
// deprecated
const regex = fn;
fn = (val, def) => {
const m = regex.exec(val);
return m ? m[0] : def;
};
option.default(defaultValue).argParser(fn);
} else {
option.default(fn);
}
return this.addOption(option);
}
/**
* Define option with `flags`, `description` and optional
* coercion `fn`.
*
* The `flags` string contains the short and/or 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"
*
* @example
* // 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
*/
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 contains the short and/or 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
*/
requiredOption(flags, description, fn, defaultValue) {
return this._optionEx({ mandatory: true }, flags, description, fn, defaultValue);
};
/**
* Alter parsing of short flags with optional values.
*
* @example
* // for `.option('-f,--flag [value]'):
* program.combineFlagAndOptionalValue(true); // `-f80` is treated like `--flag=80`, this is the default behaviour
* program.combineFlagAndOptionalValue(false) // `-fb` is treated like `-f -b`
*
* @param {Boolean} [combine=true] - if `true` or omitted, an optional value can be specified directly after the flag.
*/
combineFlagAndOptionalValue(combine = true) {
this._combineFlagAndOptionalValue = !!combine;
return this;
};
/**
* Allow unknown options on the command line.
*
* @param {Boolean} [allowUnknown=true] - if `true` or omitted, no error will be thrown
* for unknown options.
*/
allowUnknownOption(allowUnknown = true) {
this._allowUnknownOption = !!allowUnknown;
return this;
};
/**
* Allow excess command-arguments on the command line. Pass false to make excess arguments an error.
*
* @param {Boolean} [allowExcess=true] - if `true` or omitted, no error will be thrown
* for excess arguments.
*/
allowExcessArguments(allowExcess = true) {
this._allowExcessArguments = !!allowExcess;
return this;
};
/**
* Enable positional options. Positional means global options are specified before subcommands which lets
* subcommands reuse the same option names, and also enables subcommands to turn on passThroughOptions.
* The default behaviour is non-positional and global options may appear anywhere on the command line.
*
* @param {Boolean} [positional=true]
*/
enablePositionalOptions(positional = true) {
this._enablePositionalOptions = !!positional;
return this;
};
/**
* Pass through options that come after command-arguments rather than treat them as command-options,
* so actual command-options come before command-arguments. Turning this on for a subcommand requires
* positional options to have been enabled on the program (parent commands).
* The default behaviour is non-positional and options may appear before or after command-arguments.
*
* @param {Boolean} [passThrough=true]
* for unknown options.
*/
passThroughOptions(passThrough = true) {
this._passThroughOptions = !!passThrough;
if (!!this.parent && passThrough && !this.parent._enablePositionalOptions) {
throw new Error('passThroughOptions can not be used without turning on enablePositionalOptions for parent command(s)');
}
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} [storeAsProperties=true]
* @return {Command} `this` command for chaining
*/
storeOptionsAsProperties(storeAsProperties = true) {
this._storeOptionsAsProperties = !!storeAsProperties;
if (this.options.length) {
throw new Error('call .storeOptionsAsProperties() before adding options');
}
return this;
};
/**
* Retrieve option value.
*
* @param {string} key
* @return {Object} value
*/
getOptionValue(key) {
if (this._storeOptionsAsProperties) {
return this[key];
}
return this._optionValues[key];
};
/**
* Store option value.
*
* @param {string} key
* @param {Object} value
* @return {Command} `this` command for chaining
*/
setOptionValue(key, value) {
if (this._storeOptionsAsProperties) {
this[key] = value;
} else {
this._optionValues[key] = value;
}
return this;
};
/**
* Store option value and where the value came from.
*
* @param {string} key
* @param {Object} value
* @param {string} source - expected values are default/config/env/cli
* @return {Command} `this` command for chaining
*/
setOptionValueWithSource(key, value, source) {
this.setOptionValue(key, value);
this._optionValueSources[key] = source;
return this;
}
/**
* Get source of option value.
* Expected values are default | config | env | cli
*
* @param {string} key
* @return {string}
*/
getOptionValueSource(key) {
return this._optionValueSources[key];
};
/**
* Get user arguments implied or explicit arguments.
* Side-effects: set _scriptPath if args included application, and use that to set implicit command name.
*
* @api private
*/
_prepareUserArgs(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: unknown property
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: unknown property
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 && require.main) {
this._scriptPath = require.main.filename;
}
// Guess name, used in usage in help.
this._name = this._name || (this._scriptPath && path.basename(this._scriptPath, path.extname(this._scriptPath)));
return userArgs;
}
/**
* 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.
*
* @example
* 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
*/
parse(argv, parseOptions) {
const userArgs = this._prepareUserArgs(argv, parseOptions);
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.
*
* @example
* await program.parseAsync(process.argv);
* await program.parseAsync(); // implicitly use process.argv and auto-detect node vs electron conventions
* await 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}
*/
async parseAsync(argv, parseOptions) {
const userArgs = this._prepareUserArgs(argv, parseOptions);
await this._parseCommand([], userArgs);
return 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', '.cjs'];
// 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 && require.main) {
scriptPath = require.main.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}${ext}`;
}
});
}
launchWithNode = sourceExt.includes(path.extname(bin));
let proc;
if (process.platform !== 'win32') {
if (launchWithNode) {
args.unshift(bin);
// add executable arguments to spawn
args = incrementNodeInspectorPort(process.execArgv).concat(args);
proc = childProcess.spawn(process.argv[0], args, { stdio: 'inherit' });
} else {
proc = childProcess.spawn(bin, args, { stdio: 'inherit' });
}
} else {
args.unshift(bin);
// add executable arguments to spawn
args = incrementNodeInspectorPort(process.execArgv).concat(args);
proc = childProcess.spawn(process.execPath, args, { stdio: 'inherit' });
}
const signals = ['SIGUSR1', 'SIGUSR2', 'SIGTERM', 'SIGINT', 'SIGHUP'];
signals.forEach((signal) => {
// @ts-ignore
process.on(signal, () => {
if (proc.killed === false && proc.exitCode === null) {
proc.kill(signal);
}
});
});
// By default terminate process when spawned process terminates.
// Suppressing the exit if exitCallback defined is a bit messy and of limited use, but does allow process to stay running!
const exitCallback = this._exitCallback;
if (!exitCallback) {
proc.on('close', process.exit.bind(process));
} else {
proc.on('close', () => {
exitCallback(new CommanderError(process.exitCode || 0, 'commander.executeSubCommandAsync', '(close)'));
});
}
proc.on('error', (err) => {
// @ts-ignore
if (err.code === 'ENOENT') {
const executableMissing = `'${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.help({ error: true });
if (subCommand._executableHandler) {
this._executeSubCommand(subCommand, operands.concat(unknown));
} else {
return subCommand._parseCommand(operands, unknown);
}
};
/**
* Check this.args against expected this._args.
*
* @api private
*/
_checkNumberOfArguments() {
// too few
this._args.forEach((arg, i) => {
if (arg.required && this.args[i] == null) {
this.missingArgument(arg.name());
}
});
// too many
if (this._args.length > 0 && this._args[this._args.length - 1].variadic) {
return;
}
if (this.args.length > this._args.length) {
this._excessArguments(this.args);
}
};
/**
* Process this.args using this._args and save as this.processedArgs!
*
* @api private
*/
_processArguments() {
const myParseArg = (argument, value, previous) => {
// Extra processing for nice error message on parsing failure.
let parsedValue = value;
if (value !== null && argument.parseArg) {
try {
parsedValue = argument.parseArg(value, previous);
} catch (err) {
if (err.code === 'commander.invalidArgument') {
const message = `error: command-argument value '${value}' is invalid for argument '${argument.name()}'. ${err.message}`;
this._displayError(err.exitCode, err.code, message);
}
throw err;
}
}
return parsedValue;
};
this._checkNumberOfArguments();
const processedArgs = [];
this._args.forEach((declaredArg, index) => {
let value = declaredArg.defaultValue;
if (declaredArg.variadic) {
// Collect together remaining arguments for passing together as an array.
if (index < this.args.length) {
value = this.args.slice(index);
if (declaredArg.parseArg) {
value = value.reduce((processed, v) => {
return myParseArg(declaredArg, v, processed);
}, declaredArg.defaultValue);
}
} else if (value === undefined) {
value = [];
}
} else if (index < this.args.length) {
value = this.args[index];
if (declaredArg.parseArg) {
value = myParseArg(declaredArg, value, declaredArg.defaultValue);
}
}
processedArgs[index] = value;
});
this.processedArgs = processedArgs;
}
/**
* Once we have a promise we chain, but call synchronously until then.
*
* @param {Promise|undefined} promise
* @param {Function} fn
* @return {Promise|undefined}
* @api private
*/
_chainOrCall(promise, fn) {
// thenable
if (promise && promise.then && typeof promise.then === 'function') {
// already have a promise, chain callback
return promise.then(() => fn());
}
// callback might return a promise
return fn();
}
/**
*
* @param {Promise|undefined} promise
* @param {string} event
* @return {Promise|undefined}
* @api private
*/
_chainOrCallHooks(promise, event) {
let result = promise;
const hooks = [];
getCommandAndParents(this)
.reverse()
.filter(cmd => cmd._lifeCycleHooks[event] !== undefined)
.forEach(hookedCommand => {
hookedCommand._lifeCycleHooks[event].forEach((callback) => {
hooks.push({ hookedCommand, callback });
});
});
if (event === 'postAction') {
hooks.reverse();
}
hooks.forEach((hookDetail) => {
result = this._chainOrCall(result, () => {
return hookDetail.callback(hookDetail.hookedCommand, this);
});
});
return result;
}
/**
* Process arguments in context of this command.
* Returns action result, in case it is a promise.
*
* @api private
*/
_parseCommand(operands, unknown) {
const parsed = this.parseOptions(unknown);
this._parseOptionsEnv(); // after cli, so parseArg not called on both cli and env
operands = operands.concat(parsed.operands);
unknown = parsed.unknown;
this.args = operands.concat(unknown);
if (operands && this._findCommand(operands[0])) {
return this._dispatchSubcommand(operands[0], operands.slice(1), unknown);
}
if (this._hasImplicitHelpCommand() && operands[0] === this._helpCommandName) {
if (operands.length === 1) {
this.help();
}
return this._dispatchSubcommand(operands[1], [], [this._helpLongFlag]);
}
if (this._defaultCommandName) {
outputHelpIfRequested(this, unknown); // Run the help for default command from parent rather than passing to default command
return this._dispatchSubcommand(this._defaultCommandName, operands, unknown);
}
if (this.commands.length && this.args.length === 0 && !this._actionHandler && !this._defaultCommandName) {
// probably missing subcommand and no handler, user needs help (and exit)
this.help({ error: true });
}
outputHelpIfRequested(this, parsed.unknown);
this._checkForMissingMandatoryOptions();
// We do not always call this check to avoid masking a "better" error, like unknown command.
const checkForUnknownOptions = () => {
if (parsed.unknown.length > 0) {
this.unknownOption(parsed.unknown[0]);
}
};
const commandEvent = `command:${this.name()}`;
if (this._actionHandler) {
checkForUnknownOptions();
this._processArguments();
let actionResult;
actionResult = this._chainOrCallHooks(actionResult, 'preAction');
actionResult = this._chainOrCall(actionResult, () => this._actionHandler(this.processedArgs));
if (this.parent) this.parent.emit(commandEvent, operands, unknown); // legacy
actionResult = this._chainOrCallHooks(actionResult, 'postAction');
return actionResult;
}
if (this.parent && this.parent.listenerCount(commandEvent)) {
checkForUnknownOptions();
this._processArguments();
this.parent.emit(commandEvent, operands, unknown); // legacy
} else if (operands.length) {
if (this._findCommand('*')) { // legacy default command
return this._dispatchSubcommand('*', operands, unknown);
}
if (this.listenerCount('command:*')) {
// skip option check, emit event for possible misspelling suggestion
this.emit('command:*', operands, unknown);
} else if (this.commands.length) {
this.unknownCommand();
} else {
checkForUnknownOptions();
this._processArguments();
}
} else if (this.commands.length) {
checkForUnknownOptions();
// This command has subcommands and nothing hooked up at this level, so display help (and exit).
this.help({ error: true });
} else {
checkForUnknownOptions();
this._processArguments();
// 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[]}}
*/
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:${option.name()}`, arg.slice(index + 1));
continue;
}
}
// Not a recognised option by this command.
// Might be a command-argument, or subcommand option, or unknown option, or help command or option.
// An unknown option means further arguments also classified as unknown so can be reprocessed by subcommands.
if (maybeOption(arg)) {
dest = unknown;
}
// If using positionalOptions, stop processing our options at subcommand.
if ((this._enablePositionalOptions || this._passThroughOptions) && operands.length === 0 && unknown.length === 0) {
if (this._findCommand(arg)) {
operands.push(arg);
if (args.length > 0) unknown.push(...args);
break;
} else if (arg === this._helpCommandName && this._hasImplicitHelpCommand()) {
operands.push(arg);
if (args.length > 0) operands.push(...args);
break;
} else if (this._defaultCommandName) {
unknown.push(arg);
if (args.length > 0) unknown.push(...args);
break;
}
}
// If using passThroughOptions, stop processing options at first command-argument.
if (this._passThroughOptions) {
dest.push(arg);
if (args.length > 0) dest.push(...args);
break;
}
// add arg
dest.push(arg);
}
return { operands, unknown };
};
/**
* Return an object containing options as key-value pairs
*
* @return {Object}
*/
opts() {
if (this._storeOptionsAsProperties) {
// Preserve original behaviour so backwards compatible when still using properties
const result = {};
const len = this.options.length;
for (let i = 0; i < len; i++) {
const key = this.options[i].attributeName();
result[key] = key === this._versionOptionName ? this._version : this[key];
}
return result;
}
return this._optionValues;
};
/**
* Internal bottleneck for handling of parsing errors.
*
* @api private
*/
_displayError(exitCode, code, message) {
this._outputConfiguration.outputError(`${message}\n`, this._outputConfiguration.writeErr);
if (typeof this._showHelpAfterError === 'string') {
this._outputConfiguration.writeErr(`${this._showHelpAfterError}\n`);
} else if (this._showHelpAfterError) {
this._outputConfiguration.writeErr('\n');
this.outputHelp({ error: true });
}
this._exit(exitCode, code, message);
}
/**
* Apply any option related environment variables, if option does
* not have a value from cli or client code.
*
* @api private
*/
_parseOptionsEnv() {
this.options.forEach((option) => {
if (option.envVar && option.envVar in process.env) {
const optionKey = option.attributeName();
// Priority check. Do not overwrite cli or options from unknown source (client-code).
if (this.getOptionValue(optionKey) === undefined || ['default', 'config', 'env'].includes(this.getOptionValueSource(optionKey))) {
if (option.required || option.optional) { // option can take a value
// keep very simple, optional always takes value
this.emit(`optionEnv:${option.name()}`, process.env[option.envVar]);
} else { // boolean
// keep very simple, only care that envVar defined and not the value
this.emit(`optionEnv:${option.name()}`);
}
}
}
});
}
/**
* Argument `name` is missing.
*
* @param {string} name
* @api private
*/
missingArgument(name) {
const message = `error: missing required argument '${name}'`;
this._displayError(1, 'commander.missingArgument', message);
};
/**
* `Option` is missing an argument.
*
* @param {Option} option
* @api private
*/
optionMissingArgument(option) {
const message = `error: option '${option.flags}' argument missing`;
this._displayError(1, 'commander.optionMissingArgument', message);
};
/**
* `Option` does not have a value, and is a mandatory option.
*
* @param {Option} option
* @api private
*/
missingMandatoryOptionValue(option) {
const message = `error: required option '${option.flags}' not specified`;
this._displayError(1, 'commander.missingMandatoryOptionValue', message);
};
/**
* Unknown option `flag`.
*
* @param {string} flag
* @api private
*/
unknownOption(flag) {
if (this._allowUnknownOption) return;
let suggestion = '';
if (flag.startsWith('--') && this._showSuggestionAfterError) {
// Looping to pick up the global options too
let candidateFlags = [];
let command = this;
do {
const moreFlags = command.createHelp().visibleOptions(command)
.filter(option => option.long)
.map(option => option.long);
candidateFlags = candidateFlags.concat(moreFlags);
command = command.parent;
} while (command && !command._enablePositionalOptions);
suggestion = suggestSimilar(flag, candidateFlags);
}
const message = `error: unknown option '${flag}'${suggestion}`;
this._displayError(1, 'commander.unknownOption', message);
};
/**
* Excess arguments, more than expected.
*
* @param {string[]} receivedArgs
* @api private
*/
_excessArguments(receivedArgs) {
if (this._allowExcessArguments) return;
const expected = this._args.length;
const s = (expected === 1) ? '' : 's';
const forSubcommand = this.parent ? ` for '${this.name()}'` : '';
const message = `error: too many arguments${forSubcommand}. Expected ${expected} argument${s} but got ${receivedArgs.length}.`;
this._displayError(1, 'commander.excessArguments', message);
};
/**
* Unknown command.
*
* @api private
*/
unknownCommand() {
const unknownName = this.args[0];
let suggestion = '';
if (this._showSuggestionAfterError) {
const candidateNames = [];
this.createHelp().visibleCommands(this).forEach((command) => {
candidateNames.push(command.name());
// just visible alias
if (command.alias()) candidateNames.push(command.alias());
});
suggestion = suggestSimilar(unknownName, candidateNames);
}
const message = `error: unknown command '${unknownName}'${suggestion}`;
this._displayError(1, 'commander.unknownCommand', message);
};
/**
* Set the program version to `str`.
*
* This method auto-registers the "-V, --version" flag
* which will print the version number when passed.
*
* You can optionally supply the flags and description to override the defaults.
*
* @param {string} str
* @param {string} [flags]
* @param {string} [description]
* @return {this | string} `this` command for chaining, or version string if no arguments
*/
version(str, flags, description) {
if (str === undefined) return this._version;
this._version = str;
flags = flags || '-V, --version';
description = description || 'output the version number';
const versionOption = this.createOption(flags, description);
this._versionOptionName = versionOption.attributeName();
this.options.push(versionOption);
this.on('option:' + versionOption.name(), () => {
this._outputConfiguration.writeOut(`${str}\n`);
this._exit(0, 'commander.version', str);
});
return this;
};
/**
* Set the description to `str`.
*
* @param {string} [str]
* @param {Object} [argsDescription]
* @return {string|Command}
*/
description(str, argsDescription) {
if (str === undefined && argsDescription === undefined) return this._description;
this._description = str;
if (argsDescription) {
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}
*/
alias(alias) {
if (alias === undefined) return this._aliases[0]; // just return first, for backwards compatibility
/** @type {Command} */
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}
*/
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}
*/
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}
*/
name(str) {
if (str === undefined) return this._name;
this._name = str;
return this;
};
/**
* Return program help documentation.
*
* @param {{ error: boolean }} [contextOptions] - pass {error:true} to wrap for stderr instead of stdout
* @return {string}
*/
helpInformation(contextOptions) {
const helper = this.createHelp();
if (helper.helpWidth === undefined) {
helper.helpWidth = (contextOptions && contextOptions.error) ? this._outputConfiguration.getErrHelpWidth() : this._outputConfiguration.getOutHelpWidth();
}
return helper.formatHelp(this, helper);
};
/**
* @api private
*/
_getHelpContext(contextOptions) {
contextOptions = contextOptions || {};
const context = { error: !!contextOptions.error };
let write;
if (context.error) {
write = (arg) => this._outputConfiguration.writeErr(arg);
} else {
write = (arg) => this._outputConfiguration.writeOut(arg);
}
context.write = contextOptions.write || write;
context.command = this;
return context;
}
/**
* Output help information for this command.
*
* Outputs built-in help, and custom text added using `.addHelpText()`.
*
* @param {{ error: boolean } | Function} [contextOptions] - pass {error:true} to write to stderr instead of stdout
*/
outputHelp(contextOptions) {
let deprecatedCallback;
if (typeof contextOptions === 'function') {
deprecatedCallback = contextOptions;
contextOptions = undefined;
}
const context = this._getHelpContext(contextOptions);
getCommandAndParents(this).reverse().forEach(command => command.emit('beforeAllHelp', context));
this.emit('beforeHelp', context);
let helpInformation = this.helpInformation(context);
if (deprecatedCallback) {
helpInformation = deprecatedCallback(helpInformation);
if (typeof helpInformation !== 'string' && !Buffer.isBuffer(helpInformation)) {
throw new Error('outputHelp callback must return a string or a Buffer');
}
}
context.write(helpInformation);
this.emit(this._helpLongFlag); // deprecated
this.emit('afterHelp', context);
getCommandAndParents(this).forEach(command => command.emit('afterAllHelp', context));
};
/**
* 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
*/
helpOption(flags, description) {
if (typeof flags === 'boolean') {
this._hasHelpOption = flags;
return this;
}
this._helpFlags = flags || this._helpFlags;
this._helpDescription = description || this._helpDescription;
const helpFlags = splitOptionFlags(this._helpFlags);
this._helpShortFlag = helpFlags.shortFlag;
this._helpLongFlag = helpFlags.longFlag;
return this;
};
/**
* Output help information and exit.
*
* Outputs built-in help, and custom text added using `.addHelpText()`.
*
* @param {{ error: boolean }} [contextOptions] - pass {error:true} to write to stderr instead of stdout
*/
help(contextOptions) {
this.outputHelp(contextOptions);
let exitCode = process.exitCode || 0;
if (exitCode === 0 && contextOptions && typeof contextOptions !== 'function' && contextOptions.error) {
exitCode = 1;
}
// message: do not have all displayed text available so only passing placeholder.
this._exit(exitCode, 'commander.help', '(outputHelp)');
};
/**
* Add additional text to be displayed with the built-in help.
*
* Position is 'before' or 'after' to affect just this command,
* and 'beforeAll' or 'afterAll' to affect this command and all its subcommands.
*
* @param {string} position - before or after built-in help
* @param {string | Function} text - string to add, or a function returning a string
* @return {Command} `this` command for chaining
*/
addHelpText(position, text) {
const allowedValues = ['beforeAll', 'before', 'after', 'afterAll'];
if (!allowedValues.includes(position)) {
throw new Error(`Unexpected value for position to addHelpText.
Expecting one of '${allowedValues.join("', '")}'`);
}
const helpEvent = `${position}Help`;
this.on(helpEvent, (context) => {
let helpStr;
if (typeof text === 'function') {
helpStr = text({ error: context.error, command: context.command });
} else {
helpStr = text;
}
// Ignore falsy value when nothing to output.
if (helpStr) {
context.write(`${helpStr}\n`);
}
});
return this;
}
};
/**
* Output help information if help flags specified
*
* @param {Command} cmd - command to output help for
* @param {Array} args - array of options to search for help flags
* @api private
*/
function outputHelpIfRequested(cmd, args) {
const helpOption = cmd._hasHelpOption && args.find(arg => arg === cmd._helpLongFlag || arg === cmd._helpShortFlag);
if (helpOption) {
cmd.outputHelp();
// (Do not have all displayed text available so only passing placeholder.)
cmd._exit(0, 'commander.helpDisplayed', '(outputHelp)');
}
}
/**
* Scan arguments and increment port number for inspect calls (to avoid conflicts when spawning new command).
*
* @param {string[]} args - array of arguments from node.execArgv
* @returns {string[]}
* @api private
*/
function incrementNodeInspectorPort(args) {
// Testing for these options:
// --inspect[=[host:]port]
// --inspect-brk[=[host:]port]
// --inspect-port=[host:]port
return args.map((arg) => {
if (!arg.startsWith('--inspect')) {
return arg;
}
let debugOption;
let debugHost = '127.0.0.1';
let debugPort = '9229';
let match;
if ((match = arg.match(/^(--inspect(-brk)?)$/)) !== 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;
});
}
/**
* @param {Command} startCommand
* @returns {Command[]}
* @api private
*/
function getCommandAndParents(startCommand) {
const result = [];
for (let command = startCommand; command; command = command.parent) {
result.push(command);
}
return result;
}
exports.Command = Command;

Event Timeline

c4science · Help