github.com/manifoldco/promptui v0.9.0: Select

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify github.com/manifoldco/promptui.Select in pkg:golang/github.com/manifoldco/promptui@v0.9.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/manifoldco/promptui@v0.9.0
Demonstrate these symbols/APIs:
  - github.com/manifoldco/promptui.Select
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:580ab09427dc5bb0b5e2f27f81cb9e655d55bcf55d4def5b092d8c6beb1f2bf7","contract":["promptui.Select{Items: [\"Option A\", \"Option B\", \"Option C\"]}.Run() with newline stdin selects index 0 and returns \"Option A\"","promptui.Select{Items: [\"Option A\", \"Option B\", \"Option C\"]}.RunCursorAt(1, 0) with newline stdin selects index 1 and returns \"Option B\"","promptui.Select{Items: [\"Option A\", \"Option B\", \"Option C\"], IsVimMode: true}.Run() with 'j' and newline stdin selects index 1 and returns \"Option B\""],"goal":"verify github.com/manifoldco/promptui.Select in pkg:golang/github.com/manifoldco/promptui@v0.9.0","kind":"HOW","packages":["pkg:golang/github.com/manifoldco/promptui@v0.9.0"],"schemaVersion":1,"symbols":["github.com/manifoldco/promptui.Select"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/manifoldco/promptui@v0.9.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/manifoldco/promptui@v0.9.0","symbols":["github.com/manifoldco/promptui.Select"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.20

require github.com/manifoldco/promptui v0.9.0

require (
	github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e // indirect
	golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b // indirect
)

github.com/chzyer/logex v1.1.10 h1:Swpa1K6QvQznwJRcfTfQJmTE72DqScAa40E+fbHEXEE=
github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e h1:fY5BOSpyZCqRo5OhCuC+XN+r/bBCmeuuJtjz+bCNIf8=
github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 h1:q763qf9huN11kDQavWsoZXJNW3xEE4JJyHa5Q25/sd8=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
github.com/manifoldco/promptui v0.9.0 h1:3V4HzJk1TtXW1MTZMP7mdlwbBpIinw3HztaIlYthEiA=
github.com/manifoldco/promptui v0.9.0/go.mod h1:ka04sppxSGFAtxX0qhlYQjISsg9mR4GWtQEhdbn6Pgg=
golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b h1:MQE+LT/ABUuuvEZ+YQAMSXindAdUh7slEmAkup74op4=
golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=

package main

import (
	"fmt"
	"io"
	"strings"

	"github.com/manifoldco/promptui"
)

type nopWriteCloser struct {
	io.Writer
}

func (n *nopWriteCloser) Close() error {
	return nil
}

// SelectOption runs an interactive selection prompt on the given items.
func SelectOption(label string, items []string, input io.ReadCloser, output io.WriteCloser) (int, string, error) {
	prompt := promptui.Select{
		Label:  label,
		Items:  items,
		Stdin:  input,
		Stdout: output,
	}
	return prompt.Run()
}

func main() {
	items := []string{"Option A", "Option B", "Option C"}
	idx, result, err := SelectOption("Select an option", items, io.NopCloser(strings.NewReader("\n")), &nopWriteCloser{Writer: io.Discard})
	if err != nil {
		fmt.Printf("Selection failed: %v\n", err)
		return
	}
	fmt.Printf("Selected [%d]: %s\n", idx, result)
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/manifoldco/promptui.Select in pkg:golang/github.com/manifoldco/promptui@v0.9.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/manifoldco/promptui@v0.9.0"
  ],
  "symbols": [
    "github.com/manifoldco/promptui.Select"
  ]
}

package main

import (
	"bytes"
	"fmt"
	"io"
	"os"
	"strings"

	"github.com/manifoldco/promptui"
)

type nopWriteCloser struct {
	io.Writer
}

func (n *nopWriteCloser) Close() error {
	return nil
}

func main() {
	items := []string{"Option A", "Option B", "Option C"}

	// Test 1: Run() selects index 0 ("Option A") on default cursor position
	{
		var out bytes.Buffer
		sel := promptui.Select{
			Label:  "Choose an option",
			Items:  items,
			Stdin:  io.NopCloser(strings.NewReader("\n")),
			Stdout: &nopWriteCloser{Writer: &out},
		}

		idx, result, err := sel.Run()
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: Test 1 Run() error: %v\n", err)
			os.Exit(1)
		}
		if idx != 0 {
			fmt.Fprintf(os.Stderr, "FAIL: Test 1 expected index 0, got %d\n", idx)
			os.Exit(1)
		}
		if result != "Option A" {
			fmt.Fprintf(os.Stderr, "FAIL: Test 1 expected result %q, got %q\n", "Option A", result)
			os.Exit(1)
		}
	}

	// Test 2: RunCursorAt(1, 0) starts at index 1 and selects "Option B"
	{
		var out bytes.Buffer
		sel := promptui.Select{
			Label:  "Choose an option",
			Items:  items,
			Stdin:  io.NopCloser(strings.NewReader("\n")),
			Stdout: &nopWriteCloser{Writer: &out},
		}

		idx, result, err := sel.RunCursorAt(1, 0)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: Test 2 RunCursorAt() error: %v\n", err)
			os.Exit(1)
		}
		if idx != 1 {
			fmt.Fprintf(os.Stderr, "FAIL: Test 2 expected index 1, got %d\n", idx)
			os.Exit(1)
		}
		if result != "Option B" {
			fmt.Fprintf(os.Stderr, "FAIL: Test 2 expected result %q, got %q\n", "Option B", result)
			os.Exit(1)
		}
	}

	// Test 3: Select with VimMode navigates down with 'j' and selects "Option B"
	{
		var out bytes.Buffer
		sel := promptui.Select{
			Label:     "Choose an option",
			Items:     items,
			IsVimMode: true,
			Stdin:     io.NopCloser(strings.NewReader("j\n")),
			Stdout:    &nopWriteCloser{Writer: &out},
		}

		idx, result, err := sel.Run()
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: Test 3 VimMode Run() error: %v\n", err)
			os.Exit(1)
		}
		if idx != 1 {
			fmt.Fprintf(os.Stderr, "FAIL: Test 3 expected index 1, got %d\n", idx)
			os.Exit(1)
		}
		if result != "Option B" {
			fmt.Fprintf(os.Stderr, "FAIL: Test 3 expected result %q, got %q\n", "Option B", result)
			os.Exit(1)
		}
	}

	fmt.Println("PASS: promptui.Select contract verified")
}