A collection of common interactive command line user interfaces.
Inquirer.js
strives to be an easily embeddable and beautiful command line interface for Node.js (and perhaps the "CLI Xanadu").
Inquirer.js
should ease the process of
- providing error feedback
- asking questions
- parsing input
- validating answers
- managing hierarchical prompts
Note:
Inquirer.js
provides the user interface and the inquiry session flow. If you're searching for a full blown command line program utility, then check out commander, vorpal or args.
npm install inquirer
var inquirer = require('inquirer');
inquirer.prompt([/* Pass your questions in here */]).then(function (answers) {
// Use user feedback for... whatever!!
});
Check out the examples/
folder for code and interface examples.
node examples/pizza.js
node examples/checkbox.js
# etc...
Launch the prompt interface (inquiry session)
- questions (Array) containing Question Object (using the reactive interface, you can also pass a
Rx.Observable
instance) - returns a Promise
Register prompt plugins under name
.
- name (string) name of the this new prompt. (used for question
type
) - prompt (object) the prompt object itself (the plugin)
Create a self contained inquirer module. If don't want to affect other libraries that also rely on inquirer when you overwrite or add new prompt types.
var prompt = inquirer.createPromptModule();
prompt(questions).then(/* ... */);
A question object is a hash
containing question related values:
- type: (String) Type of the prompt. Defaults:
input
- Possible values:input
,confirm
,list
,rawlist
,password
- name: (String) The name to use when storing the answer in the answers hash.
- message: (String|Function) The question to print. If defined as a function, the first parameter will be the current inquirer session answers.
- default: (String|Number|Array|Function) Default value(s) to use if nothing is entered, or a function that returns the default value(s). If defined as a function, the first parameter will be the current inquirer session answers.
- choices: (Array|Function) Choices array or a function returning a choices array. If defined as a function, the first parameter will be the current inquirer session answers.
Array values can be simple
strings
, orobjects
containing aname
(to display in list), avalue
(to save in the answers hash) and ashort
(to display after selection) properties. The choices array can also contain aSeparator
. - validate: (Function) Receive the user input and should return
true
if the value is valid, and an error message (String
) otherwise. Iffalse
is returned, a default error message is provided. - filter: (Function) Receive the user input and return the filtered value to be used inside the program. The value returned will be added to the Answers hash.
- when: (Function, Boolean) Receive the current user answers hash and should return
true
orfalse
depending on whether or not this question should be asked. The value can also be a simple boolean.
default
, choices
(if defined as functions), validate
, filter
and when
functions can be called asynchronous. Either return a promise or use this.async()
to get a callback you'll call with the final value.
{
/* Preferred way: with promise */
filter: function () {
return new Promise(/* etc... */);
},
/* Legacy way: with this.async */
validate: function (input) {
// Declare function as asynchronous, and save the done callback
var done = this.async();
// Do async stuff
setTimeout(function () {
if (typeof input !== 'number') {
// Pass the return value in the done callback
done('You need to provide a number');
return;
}
// Pass the return value in the done callback
done(null, true);
}, 3000);
}
}
A key/value hash containing the client answers in each prompt.
- Key The
name
property of the question object - Value (Depends on the prompt)
confirm
: (Boolean)input
: User input (filtered iffilter
is defined) (String)rawlist
,list
: Selected choice value (or name if no value specified) (String)
A separator can be added to any choices
array:
// In the question object
choices: [ "Choice A", new inquirer.Separator(), "choice B" ]
// Which'll be displayed this way
[?] What do you want to do?
> Order a pizza
Make a reservation
--------
Ask opening hours
Talk to the receptionist
The constructor takes a facultative String
value that'll be use as the separator. If omitted, the separator will be --------
.
Separator instances have a property type
equal to separator
. This should allow tools façading Inquirer interface from detecting separator types in lists.
Note:: allowed options written inside square brackets (
[]
) are optional. Others are required.
Take type
, name
, message
, choices
[, default
, filter
] properties. (Note that
default must be the choice index
in the array or a choice value
)
Take type
, name
, message
, choices
[, default
, filter
] properties. (Note that
default must the choice index
in the array)
Take type
, name
, message
, choices
[, default
] properties. (Note that
default must be the choice index
in the array)
Note that the choices
object will take an extra parameter called key
for the expand
prompt. This parameter must be a single (lowercased) character. The h
option is added by the prompt and shouldn't be defined by the user.
See examples/expand.js
for a running example.
Take type
, name
, message
, choices
[, filter
, validate
, default
] properties. default
is expected to be an Array of the checked choices value.
Choices marked as {checked: true}
will be checked by default.
Choices whose property disabled
is truthy will be unselectable. If disabled
is a string, then the string will be outputted next to the disabled choice, otherwise it'll default to "Disabled"
. The disabled
property can also be a synchronous function receiving the current answers as argument and returning a boolean or a string.
Take type
, name
, message
[, default
] properties. default
is expected to be a boolean if used.
Take type
, name
, message
[, default
, filter
, validate
] properties.
Take type
, name
, message
[, default
, filter
, validate
] properties.
Along with the prompts, Inquirer offers some basic text UI.
This UI present a fixed text at the bottom of a free text zone. This is useful to keep a message to the bottom of the screen while outputting command outputs on the higher section.
var ui = new inquirer.ui.BottomBar();
// pipe a Stream to the log zone
outputStream.pipe(ui.log);
// Or simply write output
ui.log.write('something just happened.');
ui.log.write('Almost over, standby!');
// During processing, update the bottom bar content to display a loader
// or output a progress bar, etc
ui.updateBottomBar('new bottom bar content');
Internally, Inquirer uses the JS reactive extension to handle events and async flows.
This mean you can take advantage of this feature to provide more advanced flows. For example, you can dynamically add questions to be asked:
var prompts = new Rx.Subject();
inquirer.prompt(prompts);
// At some point in the future, push new questions
prompts.onNext({ /* question... */ });
prompts.onNext({ /* question... */ });
// When you're done
prompts.onCompleted();
And using the return value process
property, you can access more fine grained callbacks:
inquirer.prompt(prompts).process.subscribe(
onEachAnswer,
onError,
onComplete
);
You should expect mostly good support for the CLI below. This does not mean we won't look at issues found on other command line - feel free to report any!
- Mac OS:
- Terminal.app
- iTerm
- Windows:
- ConEmu
- cmd.exe
- Powershell
- Cygwin
- Linux (Ubuntu, openSUSE, Arch Linux, etc):
- gnome-terminal (Terminal GNOME)
- konsole
Please refer to the Github releases section for the changelog
Unit test
Unit test are written in Mocha. Please add a unit test for every new feature or bug fix. npm test
to run the test suite.
Documentation Add documentation for every API change. Feel free to send typo fixes and better docs!
We're looking to offer good support for multiple prompts and environments. If you want to help, we'd like to keep a list of testers for each terminal/OS so we can contact you and get feedback before release. Let us know if you want to be added to the list (just tweet to @vaxilart) or just add your name to the wiki
Copyright (c) 2016 Simon Boudrias (twitter: @vaxilart) Licensed under the MIT license.