"""xxd handler for Dippy.

xxd is a hex dump tool. Safe for reading, but -r (revert) mode writes files.
"""

from __future__ import annotations

from dippy.cli import Classification, HandlerContext

COMMANDS = ["xxd"]

UNSAFE_FLAGS = frozenset({"-r", "-revert"})


def classify(ctx: HandlerContext) -> Classification:
    """Classify xxd command."""
    tokens = ctx.tokens
    if not tokens:
        return Classification("ask", description="xxd (no args)")

    for token in tokens[1:]:
        if token in UNSAFE_FLAGS:
            return Classification("ask", description="xxd -r (write binary)")

    return Classification("allow", description="xxd")