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1<img width="75px" height="75px" align="right" alt="Inquirer Logo" src="https://raw.githubusercontent.com/SBoudrias/Inquirer.js/master/assets/inquirer_readme.svg?sanitize=true" title="Inquirer.js"/>
2
3# Inquirer.js
4
5[![npm](https://badge.fury.io/js/inquirer.svg)](http://badge.fury.io/js/inquirer)
6[![tests](https://travis-ci.org/SBoudrias/Inquirer.js.svg?branch=master)](http://travis-ci.org/SBoudrias/Inquirer.js)
7[![Coverage Status](https://codecov.io/gh/SBoudrias/Inquirer.js/branch/master/graph/badge.svg)](https://codecov.io/gh/SBoudrias/Inquirer.js)
8[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2FSBoudrias%2FInquirer.js.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2FSBoudrias%2FInquirer.js?ref=badge_shield)
9
10A collection of common interactive command line user interfaces.
11
12## Table of Contents
13
141. [Documentation](#documentation)
15 1. [Installation](#installation)
16 2. [Examples](#examples)
17 3. [Methods](#methods)
18 4. [Objects](#objects)
19 5. [Questions](#questions)
20 6. [Answers](#answers)
21 7. [Separator](#separator)
22 8. [Prompt Types](#prompt)
232. [User Interfaces and Layouts](#layouts)
24 1. [Reactive Interface](#reactive)
253. [Support](#support)
264. [Known issues](#issues)
275. [News](#news)
286. [Contributing](#contributing)
297. [License](#license)
308. [Plugins](#plugins)
31
32## Goal and Philosophy
33
34**`Inquirer.js`** strives to be an easily embeddable and beautiful command line interface for [Node.js](https://nodejs.org/) (and perhaps the "CLI [Xanadu](https://en.wikipedia.org/wiki/Citizen_Kane)").
35
36**`Inquirer.js`** should ease the process of
37
38- providing _error feedback_
39- _asking questions_
40- _parsing_ input
41- _validating_ answers
42- managing _hierarchical prompts_
43
44> **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](https://github.com/visionmedia/commander.js), [vorpal](https://github.com/dthree/vorpal) or [args](https://github.com/leo/args).
45
46## [Documentation](#documentation)
47
48<a name="documentation"></a>
49
50### Installation
51
52<a name="installation"></a>
53
54```shell
55npm install inquirer
56```
57
58```javascript
59var inquirer = require('inquirer');
60inquirer
61 .prompt([
62 /* Pass your questions in here */
63 ])
64 .then((answers) => {
65 // Use user feedback for... whatever!!
66 })
67 .catch((error) => {
68 if (error.isTtyError) {
69 // Prompt couldn't be rendered in the current environment
70 } else {
71 // Something else went wrong
72 }
73 });
74```
75
76<a name="examples"></a>
77
78### Examples (Run it and see it)
79
80Check out the [`packages/inquirer/examples/`](https://github.com/SBoudrias/Inquirer.js/tree/master/packages/inquirer/examples) folder for code and interface examples.
81
82```shell
83node packages/inquirer/examples/pizza.js
84node packages/inquirer/examples/checkbox.js
85# etc...
86```
87
88### Methods
89
90<a name="methods"></a>
91
92#### `inquirer.prompt(questions, answers) -> promise`
93
94Launch the prompt interface (inquiry session)
95
96- **questions** (Array) containing [Question Object](#question) (using the [reactive interface](#reactive-interface), you can also pass a `Rx.Observable` instance)
97- **answers** (object) contains values of already answered questions. Inquirer will avoid asking answers already provided here. Defaults `{}`.
98- returns a **Promise**
99
100#### `inquirer.registerPrompt(name, prompt)`
101
102Register prompt plugins under `name`.
103
104- **name** (string) name of the this new prompt. (used for question `type`)
105- **prompt** (object) the prompt object itself (the plugin)
106
107#### `inquirer.createPromptModule() -> prompt function`
108
109Create a self contained inquirer module. If you don't want to affect other libraries that also rely on inquirer when you overwrite or add new prompt types.
110
111```js
112var prompt = inquirer.createPromptModule();
113
114prompt(questions).then(/* ... */);
115```
116
117### Objects
118
119<a name="objects"></a>
120
121#### Question
122
123<a name="questions"></a>
124A question object is a `hash` containing question related values:
125
126- **type**: (String) Type of the prompt. Defaults: `input` - Possible values: `input`, `number`, `confirm`,
127 `list`, `rawlist`, `expand`, `checkbox`, `password`, `editor`
128- **name**: (String) The name to use when storing the answer in the answers hash. If the name contains periods, it will define a path in the answers hash.
129- **message**: (String|Function) The question to print. If defined as a function, the first parameter will be the current inquirer session answers. Defaults to the value of `name` (followed by a colon).
130- **default**: (String|Number|Boolean|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.
131- **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.
132 Array values can be simple `numbers`, `strings`, or `objects` containing a `name` (to display in list), a `value` (to save in the answers hash), and a `short` (to display after selection) properties. The choices array can also contain [a `Separator`](#separator).
133- **validate**: (Function) Receive the user input and answers hash. Should return `true` if the value is valid, and an error message (`String`) otherwise. If `false` is returned, a default error message is provided.
134- **filter**: (Function) Receive the user input and answers hash. Returns the filtered value to be used inside the program. The value returned will be added to the _Answers_ hash.
135- **transformer**: (Function) Receive the user input, answers hash and option flags, and return a transformed value to display to the user. The transformation only impacts what is shown while editing. It does not modify the answers hash.
136- **when**: (Function, Boolean) Receive the current user answers hash and should return `true` or `false` depending on whether or not this question should be asked. The value can also be a simple boolean.
137- **pageSize**: (Number) Change the number of lines that will be rendered when using `list`, `rawList`, `expand` or `checkbox`.
138- **prefix**: (String) Change the default _prefix_ message.
139- **suffix**: (String) Change the default _suffix_ message.
140- **askAnswered**: (Boolean) Force to prompt the question if the answer already exists.
141- **loop**: (Boolean) Enable list looping. Defaults: `true`
142
143`default`, `choices`(if defined as functions), `validate`, `filter` and `when` functions can be called asynchronously. Either return a promise or use `this.async()` to get a callback you'll call with the final value.
144
145```javascript
146{
147 /* Preferred way: with promise */
148 filter() {
149 return new Promise(/* etc... */);
150 },
151
152 /* Legacy way: with this.async */
153 validate: function (input) {
154 // Declare function as asynchronous, and save the done callback
155 var done = this.async();
156
157 // Do async stuff
158 setTimeout(function() {
159 if (typeof input !== 'number') {
160 // Pass the return value in the done callback
161 done('You need to provide a number');
162 return;
163 }
164 // Pass the return value in the done callback
165 done(null, true);
166 }, 3000);
167 }
168}
169```
170
171### Answers
172
173<a name="answers"></a>
174A key/value hash containing the client answers in each prompt.
175
176- **Key** The `name` property of the _question_ object
177- **Value** (Depends on the prompt)
178 - `confirm`: (Boolean)
179 - `input` : User input (filtered if `filter` is defined) (String)
180 - `number`: User input (filtered if `filter` is defined) (Number)
181 - `rawlist`, `list` : Selected choice value (or name if no value specified) (String)
182
183### Separator
184
185<a name="separator"></a>
186A separator can be added to any `choices` array:
187
188```
189// In the question object
190choices: [ "Choice A", new inquirer.Separator(), "choice B" ]
191
192// Which'll be displayed this way
193[?] What do you want to do?
194 > Order a pizza
195 Make a reservation
196 --------
197 Ask opening hours
198 Talk to the receptionist
199```
200
201The constructor takes a facultative `String` value that'll be use as the separator. If omitted, the separator will be `--------`.
202
203Separator instances have a property `type` equal to `separator`. This should allow tools façading Inquirer interface from detecting separator types in lists.
204
205<a name="prompt"></a>
206
207### Prompt types
208
209---
210
211> **Note:**: _allowed options written inside square brackets (`[]`) are optional. Others are required._
212
213#### List - `{type: 'list'}`
214
215Take `type`, `name`, `message`, `choices`[, `default`, `filter`, `loop`] properties. (Note that
216default must be the choice `index` in the array or a choice `value`)
217
218![List prompt](https://cdn.rawgit.com/SBoudrias/Inquirer.js/28ae8337ba51d93e359ef4f7ee24e79b69898962/assets/screenshots/list.svg)
219
220---
221
222#### Raw List - `{type: 'rawlist'}`
223
224Take `type`, `name`, `message`, `choices`[, `default`, `filter`, `loop`] properties. (Note that
225default must be the choice `index` in the array)
226
227![Raw list prompt](https://cdn.rawgit.com/SBoudrias/Inquirer.js/28ae8337ba51d93e359ef4f7ee24e79b69898962/assets/screenshots/rawlist.svg)
228
229---
230
231#### Expand - `{type: 'expand'}`
232
233Take `type`, `name`, `message`, `choices`[, `default`] properties. (Note that
234default must be the choice `index` in the array. If `default` key not provided, then `help` will be used as default choice)
235
236Note 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.
237
238See `examples/expand.js` for a running example.
239
240![Expand prompt closed](https://cdn.rawgit.com/SBoudrias/Inquirer.js/28ae8337ba51d93e359ef4f7ee24e79b69898962/assets/screenshots/expand-y.svg)
241![Expand prompt expanded](https://cdn.rawgit.com/SBoudrias/Inquirer.js/28ae8337ba51d93e359ef4f7ee24e79b69898962/assets/screenshots/expand-d.svg)
242
243---
244
245#### Checkbox - `{type: 'checkbox'}`
246
247Take `type`, `name`, `message`, `choices`[, `filter`, `validate`, `default`, `loop`] properties. `default` is expected to be an Array of the checked choices value.
248
249Choices marked as `{checked: true}` will be checked by default.
250
251Choices 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.
252
253![Checkbox prompt](https://cdn.rawgit.com/SBoudrias/Inquirer.js/28ae8337ba51d93e359ef4f7ee24e79b69898962/assets/screenshots/checkbox.svg)
254
255---
256
257#### Confirm - `{type: 'confirm'}`
258
259Take `type`, `name`, `message`, [`default`] properties. `default` is expected to be a boolean if used.
260
261![Confirm prompt](https://cdn.rawgit.com/SBoudrias/Inquirer.js/28ae8337ba51d93e359ef4f7ee24e79b69898962/assets/screenshots/confirm.svg)
262
263---
264
265#### Input - `{type: 'input'}`
266
267Take `type`, `name`, `message`[, `default`, `filter`, `validate`, `transformer`] properties.
268
269![Input prompt](https://cdn.rawgit.com/SBoudrias/Inquirer.js/28ae8337ba51d93e359ef4f7ee24e79b69898962/assets/screenshots/input.svg)
270
271---
272
273#### Input - `{type: 'number'}`
274
275Take `type`, `name`, `message`[, `default`, `filter`, `validate`, `transformer`] properties.
276
277---
278
279#### Password - `{type: 'password'}`
280
281Take `type`, `name`, `message`, `mask`,[, `default`, `filter`, `validate`] properties.
282
283![Password prompt](https://cdn.rawgit.com/SBoudrias/Inquirer.js/28ae8337ba51d93e359ef4f7ee24e79b69898962/assets/screenshots/password.svg)
284
285---
286
287Note that `mask` is required to hide the actual user input.
288
289#### Editor - `{type: 'editor'}`
290
291Take `type`, `name`, `message`[, `default`, `filter`, `validate`, `postfix`] properties
292
293Launches an instance of the users preferred editor on a temporary file. Once the user exits their editor, the contents of the temporary file are read in as the result. The editor to use is determined by reading the $VISUAL or $EDITOR environment variables. If neither of those are present, notepad (on Windows) or vim (Linux or Mac) is used.
294
295The `postfix` property is useful if you want to provide an extension.
296
297<a name="layouts"></a>
298
299### Use in Non-Interactive Environments
300
301`prompt()` requires that it is run in an interactive environment. (I.e. [One where `process.stdin.isTTY` is `true`](https://nodejs.org/docs/latest-v12.x/api/process.html#process_a_note_on_process_i_o)). If `prompt()` is invoked outside of such an environment, then `prompt()` will return a rejected promise with an error. For convenience, the error will have a `isTtyError` property to programmatically indicate the cause.
302
303## User Interfaces and layouts
304
305Along with the prompts, Inquirer offers some basic text UI.
306
307#### Bottom Bar - `inquirer.ui.BottomBar`
308
309This 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.
310
311```javascript
312var ui = new inquirer.ui.BottomBar();
313
314// pipe a Stream to the log zone
315outputStream.pipe(ui.log);
316
317// Or simply write output
318ui.log.write('something just happened.');
319ui.log.write('Almost over, standby!');
320
321// During processing, update the bottom bar content to display a loader
322// or output a progress bar, etc
323ui.updateBottomBar('new bottom bar content');
324```
325
326<a name="reactive"></a>
327
328## Reactive interface
329
330Internally, Inquirer uses the [JS reactive extension](https://github.com/ReactiveX/rxjs) to handle events and async flows.
331
332This mean you can take advantage of this feature to provide more advanced flows. For example, you can dynamically add questions to be asked:
333
334```js
335var prompts = new Rx.Subject();
336inquirer.prompt(prompts);
337
338// At some point in the future, push new questions
339prompts.next({
340 /* question... */
341});
342prompts.next({
343 /* question... */
344});
345
346// When you're done
347prompts.complete();
348```
349
350And using the return value `process` property, you can access more fine grained callbacks:
351
352```js
353inquirer.prompt(prompts).ui.process.subscribe(onEachAnswer, onError, onComplete);
354```
355
356## Support (OS Terminals)
357
358<a name="support"></a>
359
360You should expect mostly good support for the CLI below. This does not mean we won't
361look at issues found on other command line - feel free to report any!
362
363- **Mac OS**:
364 - Terminal.app
365 - iTerm
366- **Windows ([Known issues](#issues))**:
367 - [ConEmu](https://conemu.github.io/)
368 - cmd.exe
369 - Powershell
370 - Cygwin
371- **Linux (Ubuntu, openSUSE, Arch Linux, etc)**:
372 - gnome-terminal (Terminal GNOME)
373 - konsole
374
375## Known issues
376
377<a name="issues"></a>
378
379Running Inquirer together with network streams in Windows platform inside some terminals can result in process hang.
380Workaround: run inside another terminal.
381Please refer to the https://github.com/nodejs/node/issues/21771
382
383## News on the march (Release notes)
384
385<a name="news"></a>
386
387Please refer to the [GitHub releases section for the changelog](https://github.com/SBoudrias/Inquirer.js/releases)
388
389## Contributing
390
391<a name="contributing"></a>
392
393**Unit test**
394Unit test are written in [Mocha](https://mochajs.org/). Please add a unit test for every new feature or bug fix. `npm test` to run the test suite.
395
396**Documentation**
397Add documentation for every API change. Feel free to send typo fixes and better docs!
398
399We're looking to offer good support for multiple prompts and environments. If you want to
400help, we'd like to keep a list of testers for each terminal/OS so we can contact you and
401get feedback before release. Let us know if you want to be added to the list (just tweet
402to [@vaxilart](https://twitter.com/Vaxilart)) or just add your name to [the wiki](https://github.com/SBoudrias/Inquirer.js/wiki/Testers)
403
404## License
405
406<a name="license"></a>
407
408Copyright (c) 2016 Simon Boudrias (twitter: [@vaxilart](https://twitter.com/Vaxilart))
409Licensed under the MIT license.
410
411## Plugins
412
413<a name="plugins"></a>
414
415### Prompts
416
417[**autocomplete**](https://github.com/mokkabonna/inquirer-autocomplete-prompt)<br>
418Presents a list of options as the user types, compatible with other packages such as fuzzy (for search)<br>
419<br>
420![autocomplete prompt](https://github.com/mokkabonna/inquirer-autocomplete-prompt/raw/master/inquirer.gif)
421
422[**checkbox-plus**](https://github.com/faressoft/inquirer-checkbox-plus-prompt)<br>
423Checkbox list with autocomplete and other additions<br>
424<br>
425![checkbox-plus](https://github.com/faressoft/inquirer-checkbox-plus-prompt/raw/master/demo.gif)
426
427[**inquirer-date-prompt**](https://github.com/haversnail/inquirer-date-prompt)<br>
428Customizable date/time selector with localization support<br>
429<br>
430![Date Prompt](https://github.com/haversnail/inquirer-date-prompt/raw/master/examples/demo.gif)
431
432[**datetime**](https://github.com/DerekTBrown/inquirer-datepicker-prompt)<br>
433Customizable date/time selector using both number pad and arrow keys<br>
434<br>
435![Datetime Prompt](https://github.com/DerekTBrown/inquirer-datepicker-prompt/raw/master/example/datetime-prompt.png)
436
437[**inquirer-select-line**](https://github.com/adam-golab/inquirer-select-line)<br>
438Prompt for selecting index in array where add new element<br>
439<br>
440![inquirer-select-line gif](https://media.giphy.com/media/xUA7b1MxpngddUvdHW/giphy.gif)
441
442[**command**](https://github.com/sullof/inquirer-command-prompt)<br>
443Simple prompt with command history and dynamic autocomplete<br>
444
445[**inquirer-fuzzy-path**](https://github.com/adelsz/inquirer-fuzzy-path)<br>
446Prompt for fuzzy file/directory selection.<br>
447<br>
448![inquirer-fuzzy-path](https://raw.githubusercontent.com/adelsz/inquirer-fuzzy-path/master/recording.gif)
449
450[**inquirer-emoji**](https://github.com/tannerntannern/inquirer-emoji)<br>
451Prompt for inputting emojis.<br>
452<br>
453![inquirer-emoji](https://github.com/tannerntannern/inquirer-emoji/raw/master/demo.gif)
454
455[**inquirer-chalk-pipe**](https://github.com/LitoMore/inquirer-chalk-pipe)<br>
456Prompt for input chalk-pipe style strings<br>
457<br>
458![inquirer-chalk-pipe](https://github.com/LitoMore/inquirer-chalk-pipe/raw/master/screenshot.gif)
459
460[**inquirer-search-checkbox**](https://github.com/clinyong/inquirer-search-checkbox)<br>
461Searchable Inquirer checkbox<br>
462
463[**inquirer-search-list**](https://github.com/robin-rpr/inquirer-search-list)<br>
464Searchable Inquirer list<br>
465<br>
466![inquirer-search-list](https://github.com/robin-rpr/inquirer-search-list/blob/master/preview.gif)
467
468[**inquirer-prompt-suggest**](https://github.com/olistic/inquirer-prompt-suggest)<br>
469Inquirer prompt for your less creative users.<br>
470<br>
471![inquirer-prompt-suggest](https://user-images.githubusercontent.com/5600126/40391192-d4f3d6d0-5ded-11e8-932f-4b75b642c09e.gif)
472
473[**inquirer-s3**](https://github.com/HQarroum/inquirer-s3)<br>
474An S3 object selector for Inquirer.<br>
475<br>
476![inquirer-s3](https://github.com/HQarroum/inquirer-s3/raw/master/docs/inquirer-screenshot.png)
477
478[**inquirer-autosubmit-prompt**](https://github.com/yaodingyd/inquirer-autosubmit-prompt)<br>
479Auto submit based on your current input, saving one extra enter<br>
480
481[**inquirer-file-tree-selection-prompt**](https://github.com/anc95/inquirer-file-tree-selection)<br>
482Inquirer prompt for to select a file or directory in file tree<br>
483<br>
484![inquirer-file-tree-selection-prompt](https://github.com/anc95/inquirer-file-tree-selection/blob/master/example/screenshot.gif)
485
486[**inquirer-table-prompt**](https://github.com/eduardoboucas/inquirer-table-prompt)<br>
487A table-like prompt for Inquirer.<br>
488<br>
489![inquirer-table-prompt](https://raw.githubusercontent.com/eduardoboucas/inquirer-table-prompt/master/screen-capture.gif)
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