github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be

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/anmitsu/go-shlex@v0.0.0-20200514113438-38f4b401e2be
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/anmitsu/go-shlex@v0.0.0-20200514113438-38f4b401e2be
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:sha256:8693ca1837008ddd06aefc78e1773bfb6e66881b1f6285162add152d182140d5","contract":["shlex.Split parses command-line strings into argument slices using POSIX quoting and escaping rules","shlex.Split preserves escaped characters and spaces when using backslashes","shlex.Split returns ErrNoClosing when a quoted argument is not terminated","shlex.Split returns ErrNoEscaped when an escape backslash appears at the end of input","shlex.NewLexer and NewLexerString tokenize input streams and strings into words"],"goal":"verify pkg:golang/github.com/anmitsu/go-shlex@v0.0.0-20200514113438-38f4b401e2be","kind":"HOW","packages":["pkg:golang/github.com/anmitsu/go-shlex@v0.0.0-20200514113438-38f4b401e2be"],"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/anmitsu/go-shlex@v0.0.0-20200514113438-38f4b401e2be"],"schemaVersion":1,"subject":"pkg:golang/github.com/anmitsu/go-shlex@v0.0.0-20200514113438-38f4b401e2be","verifierAdapter":"golang@1"}

module example.com/sample

go 1.22.0

require github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be

github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=

package main

import (
	"fmt"
	"os"

	"github.com/anmitsu/go-shlex"
)

// SplitCommand splits a shell command line string into separate arguments using POSIX rules.
func SplitCommand(cmdLine string) ([]string, error) {
	return shlex.Split(cmdLine, true)
}

// TokenizeWords tokenizes a string using Lexer with custom settings.
func TokenizeWords(input string) ([]string, error) {
	lexer := shlex.NewLexerString(input, true, false)
	return lexer.Split()
}

func main() {
	cmd := `echo "hello world" 'single quoted' flag\ with\ space`
	args, err := SplitCommand(cmd)
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to split command: %v\n", err)
		os.Exit(1)
	}

	fmt.Printf("Split %d arguments:\n", len(args))
	for i, arg := range args {
		fmt.Printf("  [%d] %s\n", i, arg)
	}
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/github.com/anmitsu/go-shlex@v0.0.0-20200514113438-38f4b401e2be",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/anmitsu/go-shlex@v0.0.0-20200514113438-38f4b401e2be"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package main

import (
	"errors"
	"fmt"
	"os"
	"reflect"
	"strings"

	"github.com/anmitsu/go-shlex"
)

func main() {
	// Assertion 1: shlex.Split parses command-line strings into argument slices using POSIX quoting and escaping rules
	{
		input := `grep -rn "search term" 'another argument' standalone`
		got, err := shlex.Split(input, true)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: shlex.Split unexpected error: %v\n", err)
			os.Exit(1)
		}
		expected := []string{"grep", "-rn", "search term", "another argument", "standalone"}
		if !reflect.DeepEqual(got, expected) {
			fmt.Fprintf(os.Stderr, "FAIL: shlex.Split result mismatch: got %v, want %v\n", got, expected)
			os.Exit(1)
		}
	}

	// Assertion 2: shlex.Split preserves escaped characters and spaces when using backslashes
	{
		input := `printf "escaped \"quotes\"" unquoted\ space`
		got, err := shlex.Split(input, true)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: shlex.Split with escapes failed: %v\n", err)
			os.Exit(1)
		}
		expected := []string{"printf", `escaped "quotes"`, "unquoted space"}
		if !reflect.DeepEqual(got, expected) {
			fmt.Fprintf(os.Stderr, "FAIL: shlex.Split escape mismatch: got %v, want %v\n", got, expected)
			os.Exit(1)
		}
	}

	// Assertion 3: shlex.Split returns ErrNoClosing when a quoted argument is not terminated
	{
		input := `echo "unclosed string`
		_, err := shlex.Split(input, true)
		if err == nil {
			fmt.Fprintf(os.Stderr, "FAIL: expected error for unclosed quote, got nil\n")
			os.Exit(1)
		}
		if !errors.Is(err, shlex.ErrNoClosing) && err != shlex.ErrNoClosing {
			fmt.Fprintf(os.Stderr, "FAIL: expected ErrNoClosing, got %v\n", err)
			os.Exit(1)
		}
	}

	// Assertion 4: shlex.Split returns ErrNoEscaped when an escape backslash appears at the end of input
	{
		input := `echo trailing escape \`
		_, err := shlex.Split(input, true)
		if err == nil {
			fmt.Fprintf(os.Stderr, "FAIL: expected error for trailing escape, got nil\n")
			os.Exit(1)
		}
		if !errors.Is(err, shlex.ErrNoEscaped) && err != shlex.ErrNoEscaped {
			fmt.Fprintf(os.Stderr, "FAIL: expected ErrNoEscaped, got %v\n", err)
			os.Exit(1)
		}
	}

	// Assertion 5: shlex.NewLexer and NewLexerString tokenize input streams and strings into words
	{
		reader := strings.NewReader("word1 'quoted word2' word3")
		lexer := shlex.NewLexer(reader, true, false)
		got, err := lexer.Split()
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: NewLexer Split failed: %v\n", err)
			os.Exit(1)
		}
		expected := []string{"word1", "quoted word2", "word3"}
		if !reflect.DeepEqual(got, expected) {
			fmt.Fprintf(os.Stderr, "FAIL: NewLexer Split mismatch: got %v, want %v\n", got, expected)
			os.Exit(1)
		}

		strLexer := shlex.NewLexerString("alpha beta gamma", true, false)
		gotStr, err := strLexer.Split()
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: NewLexerString Split failed: %v\n", err)
			os.Exit(1)
		}
		expectedStr := []string{"alpha", "beta", "gamma"}
		if !reflect.DeepEqual(gotStr, expectedStr) {
			fmt.Fprintf(os.Stderr, "FAIL: NewLexerString Split mismatch: got %v, want %v\n", gotStr, expectedStr)
			os.Exit(1)
		}
	}

	fmt.Println("PASS: pkg:golang/github.com/anmitsu/go-shlex@v0.0.0-20200514113438-38f4b401e2be contract passed")
}