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Available as part of the Tidelift Subscription. The Boolean value of an expression is the basis for all JavaScript comparisons and conditions. The maintainers of Commander and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. The help information is auto-generated based on the information commander already knows about your program. You use .arguments to specify the arguments for the top-level command, and for subcommands they are usually included in the .command call. The method is otherwise the same as .option in format, taking flags and description, and optional default value or custom processing. 103k 70 70 gold badges 245 245 silver badges 361 361 bronze badges. You can specify a default value for an option which takes a value. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including commander with all npm packages installed. when creating subcommands using .command(), and you may override it to About The special argument -- stops option processing entirely. It returns the new value for the option. The arguments may be
Angled brackets (e.g. You can specify a default boolean value for a boolean flag and it can be overridden on command line. See also optional new behaviour to avoid name clashes. You can use -- to indicate the end of the options, and any remaining arguments will be used without being interpreted. The action handler gets passed a parameter for each argument you declared, and one additional argument which is the Commander exports a global object which is convenient for quick programs. The override callback is passed a CommanderError with properties exitCode number, code string, and message. This factory function creates a new command. (The text does not include the custom help
Learn more. clone a repository into a newly created directory,  Command implemented using stand-alone executable file (description is second parameter to `.command`). You may make an option variadic by appending ... to the value placeholder when declaring the option. Example file: options-custom-processing.js. Each option can have a short flag (single character) and a long name, separated by a comma or space or vertical bar ('|'). If you use ts-node and stand-alone executable subcommands written as .ts files, you need to call your program through node to get the subcommands called correctly. The extra arguments Tags: Command Line Apps, Command Line Utilities, Parser, CLI, Cli-app, Command-line, Command, Option, Commander. In the first parameter to .command() you specify the command name and any command arguments. help option is -h,--help. These are effectively the same if the shell program has implicit help: You can display extra information by listening for "--help". The normal display of error messages or version or help Given: Output help information and exit immediately. Commander will search the executables in the directory of the entry script (like ./examples/pm) with the name program-subcommand, like pm-install, pm-search. deduced from the (full) program arguments. The current version of Commander is fully supported on Long Term Support versions of Node, and is likely to work with Node 6 but not tested. This is very convenient to code, but the downside is possible clashes with You may supply an async action handler, in which case you call .parseAsync rather than .parse.
The optional version method adds handling for displaying the command version. The complete solution for node.js command-line interfaces, inspired by Ruby's commander.
This happens when a calculation is impossible to perform, as an attempt to divide 0 by 0. as properties on the program, and the action handler is passed a Installation; Declaring program variable; Options. Any unknown options will be reported as an error. First, start your new project — let’s say my project name is “json-now”. These are effectively the same if the shell program has implicit help: You can display extra information by listening for "--help". (For versions of Node below Node 6, use Commander 3.x or 2.x.).
These allow you to customise the usage description in the first line of the help. existing properties of Command. The options can be accessed as properties on the Command object. Very often, in programming, you will need a data type that can only have one Visit our partner's website for more details. Get the command help information as a string for processing or displaying yourself. The default option flags are -V and --version, and when present the command prints the version number and exits. By default Commander calls process.exit when it detects errors, or after displaying the help or version. Output help information without exiting.
Use Git or checkout with SVN using the web URL. jQuery Example file: [options-flag-or-value.js](./examples/options-flag-or-value.js). By default Commander calls process.exit when it detects errors, or after displaying the help or version. If you use ts-node and stand-alone executable subcommands written as .ts files, you need to call your program through node to get the subcommands called correctly. The extra arguments It returns the new value for the option. This is particularly useful for passing options through to another On the command line you Learn more. The reference contains descriptions and examples of all Boolean properties and methods. Read this in other languages: English | 简体中文. they're used to log you in. Do you think we are missing an alternative of Commander.js or a related project? Commander will search the executables in the directory of the entry script (like ./examples/pm) with the name program-subcommand, like pm-install, pm-search. Example file: [options-defaults.js](./examples/options-defaults.js). , small: undefined, pizzaType: undefined }, You ordered a pizza with sauce and mozzarella cheese, You ordered a pizza with sauce and blue cheese, $ pizza-options --no-sauce --no-cheese, You ordered a pizza with no sauce and no cheese,  parseInt takes a string and an optional radix, $ collect -n 1 2 3 --letter a b c, $ collect --letter -n 1 -n 2 3 -- operand,  Command implemented using action handler (description is supplied separately to `.command`). Each option can have a short flag (single character) and a long name, separated by a comma or space or vertical bar ('|'). The override callback is passed a CommanderError with properties exitCode number, code string, and message. Override the default help flags and description. You signed in with another tab or window. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. The callback function receives two parameters, the user specified value and the Truncate a string to a specific width in the terminal. The override callback is passed a CommanderError with properties exitCode number, code string, and message. command object with the options values stored as properties. The default option flags are -V and --version, and when present the command prints the version number and exits. Options are defined with the .option() method, also serving as documentation for the options. [optional]) indicate optional input. If a value The subcommands may be nested ([example](./examples/nestedCommands.js)). The default override throws a CommanderError. In the first parameter to .command() you specify the command name and any command arguments. is specified in the same argument as the option then no further values are read. You can always update your selection by clicking Cookie Preferences at the bottom of the page. They vary from L1 to L5 with "L5" being the highest. if (program.bbqSauce) console.log(' - bbq'); Override the default help flags and description. You may make an option variadic by appending ... to the value placeholder when declaring the option. Configuration options can be passed with the call to .command() and .addCommand(). This is used in the examples in this README for brevity. Commander is currently a CommonJS package, and the default export can be imported into an ES Module: You can enable --harmony option in two ways: An executable subcommand is launched as a separate child process. Select Accept all to consent to this use, Reject all to decline this use, or More info to control your cookie preferences.
e.g. You can specify an option which functions as a flag but may also take a value (declared using square brackets). You can specify (sub)commands using .command() or .addCommand(). Specifying true for opts.hidden will remove the command from the generated help output. You can explicitly turn on or off the implicit help command with .addHelpCommand() and .addHelpCommand(false). A help command is added by default if your command has subcommands. The main forum for free and community support is the project Issues on GitHub. The override callback is passed a CommanderError with properties exitCode number, code string, and message. These are effectively the same if the shell program has implicit help: You can display extra information by listening for "--help". The two most used option types are a boolean flag, and an option which takes a value (declared using angle brackets). Commander exports a global object which is convenient for quick programs. If you define --foo first, adding --no-foo does not change the default value from what it would Both are undefined unless specified on command line. The options can be accessed as properties on the Command object.
The default override behaviour is to throw the error, except for async handling of executable subcommand completion which carries on. Our goal is to help you find the software and libraries you need.
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