func Main()

in cli/cli.go [99:144]

• 36 lines of code
• 9 McCabe index (conditional complexity)

func Main(stdin io.Reader, stdout io.Writer, stderr io.Writer, args []string) (exitCode int) {
	if len(args) == 1 && (args[0] == "-h" || args[0] == "--help") {
		printHelp(stdout)
		return 0
	}

	app, err := loadApp(stdin, stdout, stderr)
	if err != nil {
		fmt.Fprintf(stderr, "ERROR: %v\n", err)
		return 1
	}

	userOpts, err := parseOptions(args)
	if err != nil {
		fmt.Fprintf(stderr, "ERROR: %v\n", err)
		return 1
	}

	credentials, err := app.AssumeRole(assumerole.AssumeRoleParameters{
		ForceRefresh:    userOpts.forceRefresh,
		UserRole:        userOpts.role,
		RoleSessionName: userOpts.roleSessionName,
	})
	if err != nil {
		fmt.Fprintf(stderr, "ERROR: %v\n", err)
		return 1
	}

	vars := credentialsToEnv(credentials)

	if len(userOpts.args) == 0 {
		// Print vars to stdout
		printVars(vars, stdout)
	} else {
		// Add AWS credentials to the environment
		env := append(os.Environ(), vars...)

		// execve will replace the current running process on success
		if err := execute(userOpts.args[0], userOpts.args, env); err != nil {
			fmt.Fprintf(stderr, "ERROR: Could not execute command: %v\n", err)
			return 127
		}
	}

	return 0
}