From 67e1688aa1aec30db6356a43a5cc7d74db5c6516 Mon Sep 17 00:00:00 2001
From: The MMGen Project <mmgen@tuta.io>
Date: Sat, 15 Feb 2025 09:54:19 +0000
Subject: [PATCH] cfg: support `usage()` on bad invocation for txcreate

---
 mmgen/help/__init__.py    | 2 +-
 mmgen/main_txcreate.py    | 3 +++
 mmgen/opts.py             | 1 +
 test/cmdtest_d/ct_help.py | 2 +-
 4 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/mmgen/help/__init__.py b/mmgen/help/__init__.py
index 955548cd..3fd6e5b8 100755
--- a/mmgen/help/__init__.py
+++ b/mmgen/help/__init__.py
@@ -49,7 +49,7 @@ def gen_arg_tuple(cfg, func, text):
 	def help_notes(k, *args, **kwargs):
 		import importlib
 		return getattr(importlib.import_module(
-			f'{cfg._opts.help_pkg}.help_notes').help_notes(proto, cfg), k)(*args, **kwargs)
+			f'{cfg._help_pkg}.help_notes').help_notes(proto, cfg), k)(*args, **kwargs)
 
 	def help_mod(modname):
 		import importlib
diff --git a/mmgen/main_txcreate.py b/mmgen/main_txcreate.py
index 431903c7..b7d433a8 100755
--- a/mmgen/main_txcreate.py
+++ b/mmgen/main_txcreate.py
@@ -101,6 +101,9 @@ opts_data = {
 
 cfg = Config(opts_data=opts_data)
 
+if not cfg.info and len(cfg._args) < {'tx': 1, 'swaptx': 2}[target]:
+	cfg._usage()
+
 async def main():
 
 	if cfg.autosign:
diff --git a/mmgen/opts.py b/mmgen/opts.py
index cb811a5b..d1d97dd6 100755
--- a/mmgen/opts.py
+++ b/mmgen/opts.py
@@ -279,6 +279,7 @@ class Opts:
 		# Make these available to usage():
 		cfg._usage_data = opts_data['text'].get('usage2') or opts_data['text']['usage']
 		cfg._usage_code = opts_data.get('code', {}).get('usage')
+		cfg._help_pkg = self.help_pkg
 
 		if os.getenv('MMGEN_DEBUG_OPTS'):
 			opt_preproc_debug(po)
diff --git a/test/cmdtest_d/ct_help.py b/test/cmdtest_d/ct_help.py
index 555ceae3..bb36c5a7 100755
--- a/test/cmdtest_d/ct_help.py
+++ b/test/cmdtest_d/ct_help.py
@@ -50,7 +50,7 @@ class CmdTestHelp(CmdTestBase):
 		return self._usage('walletgen', ['foo'], True, False, 1)
 
 	def usage4(self):
-		return self._usage('tool' if self.coin == 'xmr' else 'addrgen', [], True, True, 1)
+		return self._usage('tool' if self.coin == 'xmr' else 'txcreate', [], True, True, 1)
 
 	def _usage(self, cmd_arg, args, no_passthru_opts, add_coin_opt, exit_val):
 		if cmd := (None if self._gen_skiplist(cmd_arg) else cmd_arg):