module cli

fn version_flag(with_abbrev bool) Flag {
    sabbrev := if with_abbrev { 'v' } else { '' }
    return Flag{
        flag:        .bool
        name:        'version'
        abbrev:      sabbrev
        description: 'Print version information'
    }
}

fn version_cmd() Command {
    return Command{
        name:        'version'
        description: 'Print version information'
        execute:     print_version_for_command
    }
}

fn print_version_for_command(cmd Command) ! {
    if cmd.args.len > 0 {
        for sub_cmd in cmd.commands {
            if sub_cmd.name == cmd.args[0] {
                target := unsafe { &sub_cmd }
                print(target.version())
                return
            }
        }
        println('Invalid command: ${cmd.args.join(' ')}')
    } else if cmd.parent != unsafe { nil } {
        println(cmd.parent.version())
    } else {
        println(cmd.version())
    }
}

// version returns a generated version `string` for the `Command`.
pub fn (cmd &Command) version() string {
    return '${cmd.name} version ${cmd.version}'
}