fix: allow long text in ux.prompt

src/cli-ux/prompt.ts

@@ -1,4 +1,5 @@
 import chalk from 'chalk'
+import readline from 'node:readline'
 
 import * as Errors from '../errors'
 import {config} from './config'
@@ -26,29 +27,36 @@ interface IPromptConfig {
 
 function normal(options: IPromptConfig, retries = 100): Promise<string> {
   if (retries < 0) throw new Error('no input')
+  const ac = new AbortController()
+  const {signal} = ac
+
   return new Promise((resolve, reject) => {
-    let timer: NodeJS.Timeout
-    if (options.timeout) {
-      timer = setTimeout(() => {
-        process.stdin.pause()
-        reject(new Error('Prompt timeout'))
-      }, options.timeout)
-      timer.unref()
-    }
+    const rl = readline.createInterface({
+      input: process.stdin,
+      output: process.stdout,
+    })
 
-    process.stdin.setEncoding('utf8')
-    process.stderr.write(options.prompt)
-    process.stdin.resume()
-    process.stdin.once('data', (b) => {
-      if (timer) clearTimeout(timer)
-      process.stdin.pause()
-      const data: string = (typeof b === 'string' ? b : b.toString()).trim()
+    rl.question(options.prompt, {signal}, (answer) => {
+      rl.close()
+      const data = answer.trim()
       if (!options.default && options.required && data === '') {
         resolve(normal(options, retries - 1))
       } else {
         resolve(data || (options.default as string))
       }
     })
+
+    if (options.timeout) {
+      signal.addEventListener(
+        'abort',
+        () => {
+          reject(new Error('Prompt timeout'))
+        },
+        {once: true},
+      )
+
+      setTimeout(() => ac.abort(), options.timeout)
+    }
   })
 }
 

test/cli-ux/prompt.test.ts

@@ -1,73 +1,65 @@
-import * as chai from 'chai'
-
-const {expect} = chai
+import {expect} from 'chai'
+import readline from 'node:readline'
+import {SinonSandbox, createSandbox} from 'sinon'
 
 import {ux} from '../../src/cli-ux'
-import {fancy} from './fancy'
 
 describe('prompt', () => {
-  fancy
-    .stdout()
-    .stderr()
-    .end('requires input', async () => {
-      const promptPromise = ux.prompt('Require input?')
-      process.stdin.emit('data', '')
-      process.stdin.emit('data', 'answer')
-      const answer = await promptPromise
-      await ux.done()
-      expect(answer).to.equal('answer')
-    })
+  let sandbox: SinonSandbox
 
-  fancy
-    .stdout()
-    .stderr()
-    .stdin('y')
-    .end('confirm', async () => {
-      const promptPromise = ux.confirm('yes/no?')
-      const answer = await promptPromise
-      await ux.done()
-      expect(answer).to.equal(true)
+  function stubReadline(answers: string[]) {
+    let callCount = 0
+    sandbox.stub(readline, 'createInterface').returns({
+      // @ts-expect-error because we're stubbing
+      async question(_message, opts, cb) {
+        callCount += 1
+        cb(answers[callCount - 1])
+      },
+      close() {},
     })
+  }
 
-  fancy
-    .stdout()
-    .stderr()
-    .stdin('n')
-    .end('confirm', async () => {
-      const promptPromise = ux.confirm('yes/no?')
-      const answer = await promptPromise
-      await ux.done()
-      expect(answer).to.equal(false)
-    })
+  beforeEach(() => {
+    sandbox = createSandbox()
+  })
 
-  fancy
-    .stdout()
-    .stderr()
-    .stdin('x')
-    .end('gets anykey', async () => {
-      const promptPromise = ux.anykey()
-      const answer = await promptPromise
-      await ux.done()
-      expect(answer).to.equal('x')
-    })
+  afterEach(() => {
+    sandbox.restore()
+  })
 
-  fancy
-    .stdout()
-    .stderr()
-    .end('does not require input', async () => {
-      const promptPromise = ux.prompt('Require input?', {
-        required: false,
-      })
-      process.stdin.emit('data', '')
-      const answer = await promptPromise
-      await ux.done()
-      expect(answer).to.equal('')
-    })
+  it('should require input', async () => {
+    stubReadline(['', '', 'answer'])
+    const answer = await ux.prompt('Require input?')
+    expect(answer).to.equal('answer')
+  })
 
-  fancy
-    .stdout()
-    .stderr()
-    .it('timeouts with no input', async () => {
-      await expect(ux.prompt('Require input?', {timeout: 1})).to.eventually.be.rejectedWith('Prompt timeout')
-    })
+  it('should not require input', async () => {
+    stubReadline([''])
+    const answer = await ux.prompt('Require input?', {required: false})
+    expect(answer).to.equal('')
+  })
+
+  it('should use default input', async () => {
+    stubReadline([''])
+    const answer = await ux.prompt('Require input?', {default: 'default'})
+    expect(answer).to.equal('default')
+  })
+
+  it('should confirm with y', async () => {
+    stubReadline(['y'])
+    const answer = await ux.confirm('yes/no?')
+    expect(answer).to.equal(true)
+  })
+
+  it('should confirm with n', async () => {
+    stubReadline(['n'])
+    const answer = await ux.confirm('yes/no?')
+    expect(answer).to.equal(false)
+  })
+
+  it('should get anykey', async () => {
+    stubReadline(['x'])
+    const answer = await ux.anykey()
+    expect(answer).to.equal('x')
+  })
 })