use poetry for project management

Author: nnsee

.gitignore

@@ -0,0 +1,3 @@
+__pycache__/
+*.pyc
+dist/

fee.py

@@ -251,15 +251,7 @@ def add_call_elf(self, argv: str) -> None:
             self.add(execline)
 
 
-class LanguageNotImplementedException(Exception):
-    pass
-
-
-class GeneratorException(Exception):
-    pass
-
-
-if __name__ == "__main__":
+def main() -> int:
     # we need to monkeypatch the help function to print to stderr
     # as we want nothing but executable code being printed to stdout
     def patched_help_call(self, parser, namespace, values, option_string=None):
@@ -388,4 +380,18 @@ def patched_help_call(self, parser, namespace, values, option_string=None):
     except Exception as e:
         print_err(f"{e.__str__()}\n")
         print_err("Use --help for more information.\n")
-        sys.exit(1)
+        return 1
+
+    return 0
+
+
+class LanguageNotImplementedException(Exception):
+    pass
+
+
+class GeneratorException(Exception):
+    pass
+
+
+if __name__ == "__main__":
+    sys.exit(main())