add supported fork info in help

src/ethereum_spec_tools/evm_tools/__init__.py

@@ -6,8 +6,10 @@
 
 from .b11r import B11R, b11r_arguments
 from .t8n import T8N, t8n_arguments
+from .utils import get_supported_forks
 
-DESCRIPTION = """
+DESCRIPTION = (
+    """
 This is the EVM tool for execution specs. The EVM tool
 provides a few useful subcommands to facilitate testing
 at the EVM layer.
@@ -18,7 +20,12 @@
 You can use this to run the following tools:
     1. t8n: A stateless state transition utility.
     2. b11r: The tool is used to assemble and seal full block rlps.
+
+
+The following forks are supported:
 """
+    + get_supported_forks()
+)
 
 parser = argparse.ArgumentParser(
     description=DESCRIPTION,

src/ethereum_spec_tools/evm_tools/utils.py

@@ -12,6 +12,8 @@
 from ethereum.base_types import U64, U256, Uint
 from ethereum.crypto.hash import Hash32
 
+from ..forks import Hardfork
+
 W = TypeVar("W", Uint, U64, U256)
 
 EXCEPTION_MAPS = {
@@ -123,6 +125,27 @@ def get_module_name(forks: Any, options: Any, stdin: Any) -> Tuple[str, int]:
     sys.exit(f"Unsupported state fork: {options.state_fork}")
 
 
+def get_supported_forks() -> str:
+    """
+    Get the supported forks.
+    """
+    supported_forks = [
+        fork.title_case_name.replace(" ", "") for fork in Hardfork.discover()
+    ]
+
+    # Add the exception forks
+    supported_forks.extend(EXCEPTION_MAPS.keys())
+
+    # Remove the unsupported forks
+    supported_forks = [
+        fork
+        for fork in supported_forks
+        if fork.casefold() not in UNSUPPORTED_FORKS
+    ]
+
+    return "\n".join(supported_forks)
+
+
 def get_stream_logger(name: str) -> Any:
     """
     Get a logger that writes to stdout.