github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d

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/github.com/mgutz/ansi@v0.0.0-20200706080929-d51e80ef957d
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/mgutz/ansi@v0.0.0-20200706080929-d51e80ef957d
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:sha256:290a8c0260132dacc591033cd307cf07eab0368d7f5ba6d9b8ed9be34fdf02ef","contract":["ansi color constants like Reset, Red, Green, and LightBlue provide standard ANSI escape sequences","ansi.Color formats strings with foreground color and style attributes, resetting at the end","ansi.ColorCode returns ANSI escape sequence for composite foreground, background, and text attributes","ansi.ColorFunc returns a reusable closure that applies precompiled ANSI color styling to strings","ansi.DisableColors disables ANSI code generation and returns plain unstyled strings"],"goal":"verify pkg:golang/github.com/mgutz/ansi@v0.0.0-20200706080929-d51e80ef957d","kind":"HOW","packages":["pkg:golang/github.com/mgutz/ansi@v0.0.0-20200706080929-d51e80ef957d"],"schemaVersion":1},"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/mgutz/ansi@v0.0.0-20200706080929-d51e80ef957d"],"schemaVersion":1,"subject":"pkg:golang/github.com/mgutz/ansi@v0.0.0-20200706080929-d51e80ef957d","verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d

require (
	github.com/mattn/go-colorable v0.1.15 // indirect
	github.com/mattn/go-isatty v0.0.20 // indirect
	golang.org/x/sys v0.29.0 // indirect
)

github.com/mattn/go-colorable v0.1.15 h1:+u9SLTRGnXv73cEsnsmoZBom+dMU88B2M0aDcWy0/jY=
github.com/mattn/go-colorable v0.1.15/go.mod h1:6LmQG8QLFO4G5z1gPvYEzlUgJ2wF+stgPZH1UqBm1s8=
github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d h1:5PJl274Y63IEHC+7izoQE9x6ikvDFZS2mDVS3drnohI=
github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d/go.mod h1:01TrycV0kFyexm33Z7vhZRXopbI8J3TDReVlkTgMUxE=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

package main

import (
	"fmt"

	"github.com/mgutz/ansi"
)

func main() {
	msg := ansi.Color("Hello, ANSI World!", "green+b")
	fmt.Println(msg)

	warn := ansi.ColorFunc("yellow+b:black")
	fmt.Println(warn("Warning: High temperature detected"))

	infoCode := ansi.ColorCode("cyan+u")
	resetCode := ansi.ColorCode("reset")
	fmt.Printf("%sUnderlined Info%s\n", infoCode, resetCode)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/github.com/mgutz/ansi@v0.0.0-20200706080929-d51e80ef957d",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/mgutz/ansi@v0.0.0-20200706080929-d51e80ef957d"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package main

import (
	"fmt"
	"os"
	"strings"

	"github.com/mgutz/ansi"
)

func main() {
	if err := runContract(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract verification failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All ansi contract assertions passed successfully.")
}

func runContract() error {
	// 1. Verify standard color constants
	if ansi.Reset != "\033[0m" {
		return fmt.Errorf("expected Reset to be %q, got %q", "\033[0m", ansi.Reset)
	}
	if ansi.Red != "\033[0;31m" {
		return fmt.Errorf("expected Red to be %q, got %q", "\033[0;31m", ansi.Red)
	}
	if ansi.Green != "\033[0;32m" {
		return fmt.Errorf("expected Green to be %q, got %q", "\033[0;32m", ansi.Green)
	}
	if ansi.LightBlue != "\033[0;94m" {
		return fmt.Errorf("expected LightBlue to be %q, got %q", "\033[0;94m", ansi.LightBlue)
	}

	// 2. ansi.Color formats strings with foreground and attributes and resets
	colored := ansi.Color("sample text", "red+b")
	expectedRedBold := "\033[0;1;31msample text\033[0m"
	if colored != expectedRedBold {
		return fmt.Errorf("Color red+b failed: expected %q, got %q", expectedRedBold, colored)
	}

	// 3. ansi.ColorCode returns escape codes for styles including foreground, background, and attributes
	code := ansi.ColorCode("green+u:white+h")
	if !strings.HasPrefix(code, "\033[") {
		return fmt.Errorf("ColorCode expected ANSI escape sequence, got %q", code)
	}
	resetCode := ansi.ColorCode("reset")
	if resetCode != ansi.Reset {
		return fmt.Errorf("ColorCode('reset') expected %q, got %q", ansi.Reset, resetCode)
	}

	// 4. ansi.ColorFunc returns a reusable formatting closure
	fn := ansi.ColorFunc("cyan+b:black")
	formatted1 := fn("first message")
	formatted2 := fn("second message")
	if !strings.Contains(formatted1, "first message") || !strings.HasSuffix(formatted1, ansi.Reset) {
		return fmt.Errorf("ColorFunc output 1 invalid: %q", formatted1)
	}
	if !strings.Contains(formatted2, "second message") || !strings.HasSuffix(formatted2, ansi.Reset) {
		return fmt.Errorf("ColorFunc output 2 invalid: %q", formatted2)
	}

	// 5. ansi.DisableColors disables ANSI styling globally
	ansi.DisableColors(true)
	defer ansi.DisableColors(false)

	disabledColored := ansi.Color("plain text", "red+b")
	if disabledColored != "plain text" {
		return fmt.Errorf("DisableColors failed for Color: expected %q, got %q", "plain text", disabledColored)
	}
	disabledCode := ansi.ColorCode("red+b")
	if disabledCode != "" {
		return fmt.Errorf("DisableColors failed for ColorCode: expected empty string, got %q", disabledCode)
	}
	disabledFnResult := fn("uncolored message")
	if disabledFnResult != "uncolored message" {
		return fmt.Errorf("DisableColors failed for ColorFunc: expected %q, got %q", "uncolored message", disabledFnResult)
	}

	return nil
}