github.com/urfave/cli v1.22.14: nested subcommands with before and after hooks and flags

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: nested subcommands with before and after hooks and flags
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/urfave/cli@v1.22.14
Demonstrate these symbols/APIs:
  - cli.BoolFlag
  - cli.Command
  - cli.Context
  - cli.IntFlag
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.

package main

import (
	"fmt"
	"os"

	"github.com/urfave/cli"
)

// AppState tracks lifecycle hook execution order and flag values.
type AppState struct {
	Trace         []string
	GlobalVerbose bool
	NestedCount   int
	DryRun        bool
}

// BuildApp constructs a CLI application with global flags, Before/After hooks, and nested subcommands.
func BuildApp(state *AppState) *cli.App {
	app := cli.NewApp()
	app.Name = "clitool"
	app.Usage = "tool demonstrating nested subcommands, hooks, and typed flags"
	app.Version = "1.0.0"

	app.Flags = []cli.Flag{
		cli.BoolFlag{
			Name:  "verbose, V",
			Usage: "enable global verbose logging",
		},
	}

	app.Before = func(c *cli.Context) error {
		state.Trace = append(state.Trace, "app.Before")
		state.GlobalVerbose = c.GlobalBool("verbose")
		return nil
	}

	app.After = func(c *cli.Context) error {
		state.Trace = append(state.Trace, "app.After")
		return nil
	}

	app.Commands = []cli.Command{
		{
			Name:  "cluster",
			Usage: "manage cluster resources",
			Subcommands: []cli.Command{
				{
					Name:  "scale",
					Usage: "scale cluster replicas",
					Flags: []cli.Flag{
						cli.IntFlag{
							Name:  "replicas, r",
							Value: 1,
							Usage: "number of replicas",
						},
						cli.BoolFlag{
							Name:  "dry-run",
							Usage: "simulate scaling without modifying state",
						},
					},
					Action: func(c *cli.Context) error {
						state.Trace = append(state.Trace, "cluster.scale.Action")
						state.NestedCount = c.Int("replicas")
						state.DryRun = c.Bool("dry-run")
						return nil
					},
				},
			},
		},
	}

	return app
}

func main() {
	state := &AppState{}
	app := BuildApp(state)
	if err := app.Run(os.Args); err != nil {
		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
		os.Exit(1)
	}
}

{"case":{"caseId":"case:sha256:a5a0ddec6f2cfe02b2726fad215406456ef145712c8bb665186ab6caa1842aa3","contract":["cli.App Before and After hooks execute in lifecycle order","cli.Command Subcommands executes nested subcommand action","cli.Context Int parses IntFlag and Context Bool parses BoolFlag","cli.Context GlobalBool parses global BoolFlag in nested subcommand"],"goal":"nested subcommands with before and after hooks and flags","kind":"HOW","packages":["pkg:golang/github.com/urfave/cli@v1.22.14"],"schemaVersion":1,"symbols":["cli.BoolFlag","cli.Command","cli.Context","cli.IntFlag"]},"contractCommand":["go","test","./..."],"environment":{"arch":"amd64","distro":"ubuntu","ecosystem":"golang","language":"go","languageVersion":"1.26.6","libc":"glibc","libcVersion":"2.39","moduleSystem":"go-mod","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/urfave/cli@v1.22.14"],"schemaVersion":1,"subject":"pkg:golang/github.com/urfave/cli@v1.22.14","symbols":["cli.BoolFlag","cli.Command","cli.Context","cli.IntFlag"],"verifierAdapter":"golang@1"}

module test-urfave-subcommands

go 1.26.6

require (
	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
	github.com/russross/blackfriday/v2 v2.1.0 // indirect
	github.com/urfave/cli v1.22.14
)

github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
github.com/urfave/cli v1.22.14 h1:ebbhrRiGK2i4naQJr+1Xj92HXZCrK7MsyTS/ob3HnAk=
github.com/urfave/cli v1.22.14/go.mod h1:X0eDS6pD6Exaclxm99NJ3FiCDRED7vIHpx2mDOHLvkA=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

{
  "schemaVersion": 1,
  "goal": "nested subcommands with before and after hooks and flags",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/urfave/cli@v1.22.14"
  ],
  "symbols": [
    "cli.BoolFlag",
    "cli.Command",
    "cli.Context",
    "cli.IntFlag"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package contract_test

import (
	"reflect"
	"testing"

	"github.com/urfave/cli"
)

// AppState tracks execution order and parsed flags for contract verification.
type AppState struct {
	Trace         []string
	GlobalVerbose bool
	NestedCount   int
	DryRun        bool
}

func buildApp(state *AppState) *cli.App {
	app := cli.NewApp()
	app.Name = "clitool"

	app.Flags = []cli.Flag{
		cli.BoolFlag{
			Name:  "verbose, V",
			Usage: "enable global verbose logging",
		},
	}

	app.Before = func(c *cli.Context) error {
		state.Trace = append(state.Trace, "app.Before")
		state.GlobalVerbose = c.GlobalBool("verbose")
		return nil
	}

	app.After = func(c *cli.Context) error {
		state.Trace = append(state.Trace, "app.After")
		return nil
	}

	app.Commands = []cli.Command{
		{
			Name:  "cluster",
			Usage: "manage cluster resources",
			Subcommands: []cli.Command{
				{
					Name:  "scale",
					Usage: "scale cluster replicas",
					Flags: []cli.Flag{
						cli.IntFlag{
							Name:  "replicas, r",
							Value: 1,
							Usage: "number of replicas",
						},
						cli.BoolFlag{
							Name:  "dry-run",
							Usage: "simulate scaling without modifying state",
						},
					},
					Action: func(c *cli.Context) error {
						state.Trace = append(state.Trace, "cluster.scale.Action")
						state.NestedCount = c.Int("replicas")
						state.DryRun = c.Bool("dry-run")
						return nil
					},
				},
			},
		},
	}

	return app
}

func TestContract_BeforeAfterHooksAndNestedSubcommands(t *testing.T) {
	state := &AppState{}
	app := buildApp(state)

	args := []string{"clitool", "--verbose", "cluster", "scale", "--replicas", "5", "--dry-run"}
	err := app.Run(args)
	if err != nil {
		t.Fatalf("app.Run failed: %v", err)
	}

	// 1. Verify hook execution order: Before -> Action -> After
	expectedTrace := []string{"app.Before", "cluster.scale.Action", "app.After"}
	if !reflect.DeepEqual(state.Trace, expectedTrace) {
		t.Fatalf("expected trace %v, got %v", expectedTrace, state.Trace)
	}

	// 2. Verify global flag parsed via c.GlobalBool
	if !state.GlobalVerbose {
		t.Fatal("expected GlobalVerbose to be true from --verbose")
	}

	// 3. Verify nested subcommand IntFlag parsed via c.Int
	if state.NestedCount != 5 {
		t.Fatalf("expected NestedCount 5, got %d", state.NestedCount)
	}

	// 4. Verify nested subcommand BoolFlag parsed via c.Bool
	if !state.DryRun {
		t.Fatal("expected DryRun to be true from --dry-run")
	}
}

func TestContract_DefaultValues(t *testing.T) {
	state := &AppState{}
	app := buildApp(state)

	args := []string{"clitool", "cluster", "scale"}
	err := app.Run(args)
	if err != nil {
		t.Fatalf("app.Run failed: %v", err)
	}

	if state.GlobalVerbose {
		t.Fatal("expected GlobalVerbose to be false by default")
	}
	if state.NestedCount != 1 {
		t.Fatalf("expected default NestedCount 1, got %d", state.NestedCount)
	}
	if state.DryRun {
		t.Fatal("expected default DryRun to be false")
	}
}