Command Line and Configuration

class Fuse:
    """
    Main FUSE filesystem class.
    
    Base class for implementing filesystems with built-in command line
    argument processing and FUSE integration.
    """
    
    fuse_args: FuseArgs          # Command line arguments
    parser: FuseOptParse         # Option parser
    multithreaded: bool          # Enable multithreading
    
    def __init__(self, *args, **kwargs):
        """
        Initialize FUSE filesystem.
        
        Args:
            version (str, optional): Version string for --version output
            usage (str, optional): Usage string for help output  
            dash_s_do (str, optional): Single-threading behavior
            parser_class (class, optional): Custom parser class
            fuse_args (FuseArgs, optional): Pre-configured arguments
            **kwargs: Additional initialization parameters
        """
    
    def parse(self, *args, **kwargs):
        """
        Parse command line arguments.
        
        Args:
            *args: Arguments to parse (default: sys.argv)
            errex (int): Exit code on error (default: don't exit)
            values (object): Object to store parsed values
            
        Returns:
            Parsed arguments and options
        """
    
    def main(self):
        """
        Enter filesystem service loop.
        
        This method starts the FUSE main loop and handles filesystem
        operations until unmount or termination.
        
        Returns:
            int: Exit status (normally doesn't return)
        """
    
    @classmethod
    def fuseoptref(cls):
        """
        Get FUSE library supported options reference.
        
        Returns:
            FuseArgs: Reference args containing all supported FUSE options
        """

class MyFS(Fuse):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.multithreaded = False  # Single-threaded filesystem
    
    def getattr(self, path):
        # ... implement filesystem methods
        pass

# Create and run filesystem
fs = MyFS(
    version="MyFS 1.0",
    usage="MyFS filesystem\n\n" + Fuse.fusage
)
fs.parse(errex=1)  # Exit on parse errors
fs.main()          # Start filesystem loop

class FuseArgs(SubOptsHive):
    """
    FUSE command line arguments container.
    
    Manages FUSE-specific command line options and mount arguments.
    """
    
    mountpoint: str              # Mount point path
    modifiers: dict             # Boolean option modifiers
    fuse_modifiers: dict        # FUSE option mappings
    
    def getmod(self, opt):
        """
        Get modifier value.
        
        Args:
            opt (str): Modifier name
            
        Returns:
            bool: Modifier value
        """
    
    def setmod(self, opt):
        """
        Set modifier to True.
        
        Args:
            opt (str): Modifier name
        """
    
    def unsetmod(self, opt):
        """
        Set modifier to False.
        
        Args:
            opt (str): Modifier name
        """
    
    def assemble(self):
        """
        Assemble arguments for FUSE.
        
        Returns:
            list: Arguments suitable for FUSE main()
        """
    
    def filter(self, other=None):
        """
        Filter arguments against option reference.
        
        Args:
            other (FuseArgs, optional): Reference args to filter against.
                                      If None, uses fuseoptref() result.
        """

def custom_parse(self):
    # Access parsed arguments
    args = self.fuse_args
    
    # Check for specific modifiers
    if args.getmod('foreground'):
        print("Running in foreground mode")
    
    if args.getmod('showhelp'):
        self.parser.print_help()
        sys.exit(0)
    
    # Get mount point
    if args.mountpoint:
        print(f"Mounting at: {args.mountpoint}")
    else:
        print("No mount point specified")
        sys.exit(1)

class FuseOptParse(SubbedOptParse):
    """
    FUSE option parser.
    
    Enhanced OptionParser with FUSE integration and sub-option support.
    """
    
    fuse_args: FuseArgs          # Associated FuseArgs instance
    
    def parse_args(self, args=None, values=None):
        """
        Parse command line arguments.
        
        Args:
            args (list): Arguments to parse
            values (object): Object to store values
            
        Returns:
            tuple: (options, args) tuple
        """
    
    def add_option(self, *args, **kwargs):
        """
        Add command line option.
        
        Args:
            *args: Option names (-f, --foreground)
            **kwargs: Option configuration
            
        Returns:
            Option: Created option object
        """
    
    def print_help(self, file=None):
        """
        Print help message including FUSE options.
        
        Args:
            file: Output file (default: sys.stdout)
        """
    
    def print_version(self, file=None):
        """
        Print version information.
        
        Args:
            file: Output file (default: sys.stdout)
        """

class MyFS(Fuse):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        
        # Add custom options
        self.parser.add_option(
            '-d', '--debug',
            action='store_true',
            help='Enable debug mode'
        )
        
        self.parser.add_option(
            '--cache-size',
            type='int',
            default=1024,
            help='Cache size in MB'
        )
    
    def parse(self, *args, **kwargs):
        options, args = super().parse(*args, **kwargs)
        
        # Access custom options
        if hasattr(options, 'debug') and options.debug:
            self.enable_debug()
        
        if hasattr(options, 'cache_size'):
            self.set_cache_size(options.cache_size)
        
        return options, args

class FuseFormatter(SubbedOptIndentedFormatter):
    """
    FUSE help formatter.
    
    Formats help output for FUSE-specific options and sub-options.
    """

fuse_python_api: tuple          # Global API version (0, 2)

def get_fuse_python_api():
    """
    Get current FUSE Python API version.
    
    Returns:
        tuple: API version tuple (major, minor)
    """

def get_compat_0_1():
    """
    Check if using legacy 0.1 API compatibility.
    
    Returns:
        bool: True if using 0.1 compatibility mode
    """

# Set API version before importing/using FUSE
import fuse
fuse.fuse_python_api = (0, 2)

# Or set via environment variable
# export FUSE_PYTHON_API=0.2

class MyFS(Fuse):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        
        # Check API version
        if fuse.get_compat_0_1():
            print("Warning: Using legacy 0.1 API")
        else:
            print(f"Using API version: {fuse.get_fuse_python_api()}")

# Command line usage:
# python myfs.py /mnt/point -f -o allow_other,default_permissions

class MyFS(Fuse):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        
        # Add filesystem-specific options
        self.parser.add_option(
            '-o', 
            dest='mount_options',
            help='Mount options'
        )
    
    def parse(self, *args, **kwargs):
        options, args = super().parse(*args, **kwargs)
        
        # Process mount options
        if hasattr(options, 'mount_options'):
            opts = options.mount_options.split(',')
            for opt in opts:
                if opt == 'ro':
                    self.read_only = True
                elif opt == 'allow_other':
                    self.allow_other = True

def main():
    fs = MyFS(version="MyFS 1.0")
    
    try:
        fs.parse(errex=1)  # Exit on parse errors
        fs.main()
    except OptParseError as e:
        print(f"Command line error: {e}")
        sys.exit(1)
    except Exception as e:
        print(f"Filesystem error: {e}")
        sys.exit(1)