golang.org/x/term v0.42.0: IsTerminal

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 pkg:golang/golang.org/x/term@v0.42.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/term@v0.42.0
Demonstrate these symbols/APIs:
  - term.IsTerminal

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:c64541ce1fbb061af44c2e98241668524b47a0aae11b67548a98a4d79313c9d4","contract":["term.IsTerminal returns false for invalid file descriptors","term.IsTerminal returns false for regular file descriptors","term.IsTerminal returns false for pipe file descriptors","term.IsTerminal evaluates standard stream file descriptors without panicking"],"goal":"verify pkg:golang/golang.org/x/term@v0.42.0","kind":"HOW","packages":["pkg:golang/golang.org/x/term@v0.42.0"],"schemaVersion":1,"symbols":["term.IsTerminal"]},"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/golang.org/x/term@v0.42.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/term@v0.42.0","symbols":["term.IsTerminal"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/term v0.42.0

require golang.org/x/sys v0.43.0 // indirect

golang.org/x/sys v0.43.0 h1:Rlag2XtaFTxp19wS8MXlJwTvoh8ArU6ezoyFsMyCTNI=
golang.org/x/sys v0.43.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
golang.org/x/term v0.42.0 h1:UiKe+zDFmJobeJ5ggPwOshJIVt6/Ft0rcfrXZDLWAWY=
golang.org/x/term v0.42.0/go.mod h1:Dq/D+snpsbazcBG5+F9Q1n2rXV8Ma+71xEjTRufARgY=

package main

import (
	"fmt"
	"os"

	"golang.org/x/term"
)

// CheckTerminal checks whether the provided file descriptor refers to a terminal.
func CheckTerminal(fd int) bool {
	return term.IsTerminal(fd)
}

func main() {
	stdinFd := int(os.Stdin.Fd())
	stdoutFd := int(os.Stdout.Fd())
	stderrFd := int(os.Stderr.Fd())

	fmt.Printf("Stdin (fd=%d) is terminal: %v\n", stdinFd, CheckTerminal(stdinFd))
	fmt.Printf("Stdout (fd=%d) is terminal: %v\n", stdoutFd, CheckTerminal(stdoutFd))
	fmt.Printf("Stderr (fd=%d) is terminal: %v\n", stderrFd, CheckTerminal(stderrFd))
	fmt.Printf("Invalid fd (-1) is terminal: %v\n", CheckTerminal(-1))
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/term@v0.42.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/term@v0.42.0"
  ],
  "symbols": [
    "term.IsTerminal"
  ]
}

package main

import (
	"fmt"
	"os"

	"golang.org/x/term"
)

func main() {
	// Assertion 1: term.IsTerminal returns false for invalid file descriptors
	if term.IsTerminal(-1) {
		fmt.Fprintf(os.Stderr, "FAIL: expected false for fd=-1, got true\n")
		os.Exit(1)
	}
	if term.IsTerminal(-999) {
		fmt.Fprintf(os.Stderr, "FAIL: expected false for fd=-999, got true\n")
		os.Exit(1)
	}

	// Assertion 2: term.IsTerminal returns false for regular file descriptors
	tmpFile, err := os.CreateTemp("", "contract_term_test_*")
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: failed to create temporary file: %v\n", err)
		os.Exit(1)
	}
	defer os.Remove(tmpFile.Name())
	defer tmpFile.Close()

	if term.IsTerminal(int(tmpFile.Fd())) {
		fmt.Fprintf(os.Stderr, "FAIL: expected false for regular file fd, got true\n")
		os.Exit(1)
	}

	// Assertion 3: term.IsTerminal returns false for pipe file descriptors
	r, w, err := os.Pipe()
	if err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: failed to create pipe: %v\n", err)
		os.Exit(1)
	}
	defer r.Close()
	defer w.Close()

	if term.IsTerminal(int(r.Fd())) {
		fmt.Fprintf(os.Stderr, "FAIL: expected false for pipe reader fd, got true\n")
		os.Exit(1)
	}
	if term.IsTerminal(int(w.Fd())) {
		fmt.Fprintf(os.Stderr, "FAIL: expected false for pipe writer fd, got true\n")
		os.Exit(1)
	}

	// Assertion 4: term.IsTerminal evaluates standard stream file descriptors without panicking
	_ = term.IsTerminal(int(os.Stdin.Fd()))
	_ = term.IsTerminal(int(os.Stdout.Fd()))
	_ = term.IsTerminal(int(os.Stderr.Fd()))

	fmt.Println("PASS: term.IsTerminal contract verified")
}