[agent-automation] scaffold Go CLI project

.gitignore

@@ -0,0 +1,28 @@
+# Binaries
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+test
+test.exe
+test.test
+
+# Test binary
+*.test
+
+# Output of the go coverage
+profile.out
+
+# Go build directory
+vendor/
+
+# Binary directory
+bin/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~

cmd/cli/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/marmaduke/testbed2/pkg/cli"
+)
+
+func main() {
+	if err := cli.Run(os.Args[1:]); err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+}

go.mod

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+module github.com/marmaduke/testbed2
+
+go 1.21

pkg/cli/cli.go

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+// Package cli provides the core CLI functionality.
+package cli
+
+import (
+	"fmt"
+	"os"
+)
+
+// Run executes the CLI with the given arguments.
+func Run(args []string) error {
+	if len(args) == 0 {
+		fmt.Println("testbed2 CLI")
+		fmt.Println("Usage: testbed2 <command>")
+		return nil
+	}
+
+	switch args[0] {
+	case "help", "--help", "-h":
+		fmt.Println("Available commands:")
+		fmt.Println("  help    Show this help message")
+	default:
+		return fmt.Errorf("unknown command: %s", args[0])
+	}
+
+	return nil
+}

pkg/cli/cli_test.go

@@ -0,0 +1,61 @@
+package cli
+
+import (
+	"bytes"
+	"os"
+	"testing"
+)
+
+func TestRunNoArgs(t *testing.T) {
+	oldStdout := os.Stdout
+	r, w, _ := os.Pipe()
+	os.Stdout = w
+
+	err := Run([]string{})
+
+	w.Close()
+	os.Stdout = oldStdout
+
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestRunHelp(t *testing.T) {
+	oldStdout := os.Stdout
+	r, w, _ := os.Pipe()
+	os.Stdout = w
+
+	err := Run([]string{"help"})
+
+	w.Close()
+	os.Stdout = oldStdout
+
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestRunUnknownCommand(t *testing.T) {
+	err := Run([]string{"unknown"})
+	if err == nil {
+		t.Fatal("expected error for unknown command")
+	}
+}
+
+func TestRunOutput(t *testing.T) {
+	oldStdout := os.Stdout
+	r, w, _ := os.Pipe()
+	os.Stdout = w
+
+	Run([]string{})
+
+	w.Close()
+	os.Stdout = oldStdout
+
+	buf := new(bytes.Buffer)
+	buf.ReadFrom(r)
+	if buf.Len() == 0 {
+		t.Fatal("expected output")
+	}
+}