1 files changed, 170 insertions, 0 deletions
diff --git a/gamestonk_terminal/cryptocurrency/onchain/onchain_controller.py b/gamestonk_terminal/cryptocurrency/onchain/onchain_controller.py
new file mode 100644
index 00000000000..32793ee6294
--- /dev/null
+++ b/gamestonk_terminal/cryptocurrency/onchain/onchain_controller.py
@@ -0,0 +1,170 @@
+"""Onchain Controller Module"""
+__docformat__ = "numpy"
+
+import os
+import argparse
+from typing import List
+from prompt_toolkit.completion import NestedCompleter
+
+from gamestonk_terminal import feature_flags as gtff
+from gamestonk_terminal.menu import session
+from gamestonk_terminal.helper_funcs import get_flair, parse_known_args_and_warn
+
+from gamestonk_terminal.cryptocurrency.onchain import gasnow_view
+
+# pylint: disable=R1732
+
+
+class OnchainController:
+    """Onchain Controller class"""
+
+    CHOICES = [
+        "cls",
+        "?",
+        "help",
+        "q",
+        "quit",
+    ]
+
+    CHOICES_COMMANDS = [
+        "gwei",
+    ]
+
+    CHOICES += CHOICES_COMMANDS
+
+    def __init__(self):
+        """Constructor"""
+        self.onchain_parser = argparse.ArgumentParser(add_help=False, prog="onchain")
+        self.onchain_parser.add_argument(
+            "cmd",
+            choices=self.CHOICES,
+        )
+
+    def switch(self, an_input: str):
+        """Process and dispatch input
+
+        Parameters
+        -------
+        an_input : str
+            string with input arguments
+
+        Returns
+        -------
+        True, False or None
+            False - quit the menu
+            True - quit the program
+            None - continue in the menu
+        """
+
+        # Empty command
+        if not an_input:
+            print("")
+            return None
+
+        (known_args, other_args) = self.onchain_parser.parse_known_args(
+            an_input.split()
+        )
+
+        # Help menu again
+        if known_args.cmd == "?":
+            print_help()
+            return None
+
+        # Clear screen
+        if known_args.cmd == "cls":
+            os.system("cls||clear")
+            return None
+
+        return getattr(
+            self, "call_" + known_args.cmd, lambda: "Command not recognized!"
+        )(other_args)
+
+    def call_help(self, *_):
+        """Process Help command"""
+        print_help()
+
+    def call_q(self, _):
+        """Process Q command - quit the menu"""
+        return False
+
+    def call_quit(self, _):
+        """Process Quit command - quit the program"""
+        return True
+
+    def call_gwei(self, other_args: List[str]):
+        """Process gwei command"""
+        parser = argparse.ArgumentParser(
+            add_help=False,
+            formatter_class=argparse.ArgumentDefaultsHelpFormatter,
+            prog="onchain",
+            description="""
+                Display ETH gas fees
+                [Source: https://www.gasnow.org]
+            """,
+        )
+
+        parser.add_argument(
+            "--export",
+            choices=["csv", "json", "xlsx"],
+            default="",
+            type=str,
+            dest="export",
+            help="Export dataframe data to csv,json,xlsx file",
+        )
+
+        try:
+            ns_parser = parse_known_args_and_warn(parser, other_args)
+
+            if not ns_parser:
+                return
+
+            gasnow_view.display_gwei_fees(export=ns_parser.export)
+
+        except Exception as e:
+            print(e, "\n")
+
+
+def print_help():
+    """Print help"""
+    print(
+        "https://github.com/GamestonkTerminal/GamestonkTerminal/tree/main/gamestonk_terminal/cryptocurrency/onchain"
+    )
+    print("\nOnchain:")
+    print("   cls           clear screen")
+    print("   ?/help        show this menu again")
+    print("   q             quit this menu, and shows back to main menu")
+    print("   quit          quit to abandon program")
+    print("")
+    print("   gwei          check current eth gas fees")
+    print("")
+
+
+def menu():
+    """Onchain Menu"""
+    onchain_controller = OnchainController()
+    onchain_controller.call_help(None)
+
+    while True:
+        # Get input command from user
+        if session and gtff.USE_PROMPT_TOOLKIT:
+            completer = NestedCompleter.from_nested_dict(
+                {c: None for c in onchain_controller.CHOICES}
+            )
+            an_input = session.prompt(
+                f"{get_flair()} (crypto)>(onchain)> ",
+                completer=completer,
+            )
+        else:
+            an_input = input(f"{get_flair()} (crypto)>(onchain)> ")
+
+        try:
+            process_input = onchain_controller.switch(an_input)
+        except SystemExit:
+            print("The command selected doesn't exist\n")
+            continue
+
+        if process_input is False:
+            return False
+
+        if process_input is True:
+            return True