Set ruff target-version to the minimum supported version of Python

Ignore warning about adding import for future annotations. I tried it but it wreaked havoc due to how cmd2 actively validates type hints using inspect.
If you use future annotations it delays evaluation until necessary, which benefits runtime performance but converts all type annotations to strings instead of types.

Also, cleaned up how we specify ruff per-file ignores.

Author: tleonhardt

cmd2/cmd2.py

@@ -3597,8 +3597,8 @@ def _macro_create(self, args: argparse.Namespace) -> None:
         max_arg_num = 0
         arg_nums = set()
 
-        while True:
-            try:
+        try:
+            while True:
                 cur_match = normal_matches.__next__()
 
                 # Get the number string between the braces
@@ -3612,9 +3612,8 @@ def _macro_create(self, args: argparse.Namespace) -> None:
                 max_arg_num = max(max_arg_num, cur_num)
 
                 arg_list.append(MacroArg(start_index=cur_match.start(), number_str=cur_num_str, is_escaped=False))
-
-            except StopIteration:
-                break
+        except StopIteration:
+            pass
 
         # Make sure the argument numbers are continuous
         if len(arg_nums) != max_arg_num:
@@ -3624,16 +3623,16 @@ def _macro_create(self, args: argparse.Namespace) -> None:
         # Find all escaped arguments
         escaped_matches = re.finditer(MacroArg.macro_escaped_arg_pattern, value)
 
-        while True:
-            try:
+        try:
+            while True:
                 cur_match = escaped_matches.__next__()
 
                 # Get the number string between the braces
                 cur_num_str = re.findall(MacroArg.digit_pattern, cur_match.group())[0]
 
                 arg_list.append(MacroArg(start_index=cur_match.start(), number_str=cur_num_str, is_escaped=True))
-            except StopIteration:
-                break
+        except StopIteration:
+            pass
 
         # Set the macro
         result = "overwritten" if args.name in self.macros else "created"

pyproject.toml

@@ -147,9 +147,7 @@ exclude = [
 # Same as Black.
 line-length = 127
 indent-width = 4
-
-# Assume Python 3.13
-target-version = "py313"
+target-version = "py39" # Minimum supported version of Python
 output-format = "full"
 
 [tool.ruff.lint]
@@ -235,6 +233,7 @@ ignore = [
     "E111",   # Conflicts with ruff format
     "E114",   # Conflicts with ruff format
     "E117",   # Conflicts with ruff format
+    "FA100",  # Adding from __future__ import annotations screws up cmd2 because of how use inspect to validate type annotations at runtime
     "ISC002", # Conflicts with ruff format
     "Q000",   # Conflicts with ruff format
     "Q001",   # Conflicts with ruff format
@@ -258,56 +257,35 @@ dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
 
 mccabe.max-complexity = 49
 
-per-file-ignores."cmd2/__init__.py" = [
-    "E402", # Module level import not at top of file
-    "F401", # Unused import
-]
+[tool.ruff.lint.per-file-ignores]
+# Module level import not at top of file and unused import
+"cmd2/__init__.py" = ["E402", "F401"]
 
-per-file-ignores."cmd2/argparse_custom.py" = [
-    "B010", # Do not call setattr with a constant attribute value
-]
+# Do not call setattr with constant attribute value
+"cmd2/argparse_custom.py" = ["B010"]
 
-per-file-ignores."examples/*.py" = [
+# Ignore various varnings in examples/ directory
+"examples/*.py" = [
     "ANN",     # Ignore all type annotation rules in examples folder
     "D",       # Ignore all pydocstyle rules in examples folder
     "INP001",  # Module is part of an implicit namespace
     "PLW2901", # loop variable overwritten inside loop
     "S",       # Ignore all Security rules in examples folder
 ]
+"examples/scripts/*.py" = ["F821"] # Undefined name `app`
+"plugins/*.py" = ["INP001"] # Module is part of an implicit namespace
 
-per-file-ignores."examples/scripts/*.py" = [
-    "F821", # Undefined name `app`
-]
-
-per-file-ignores."plugins/*.py" = [
-    "ANN",    # Ignore all type annotation rules in test folders
-    "D",      # Ignore all pydocstyle rules in test folders
-    "INP001", # Module is part of an implicit namespace
-    "S",      # Ignore all Security rules in test folders
-    "SLF",    # Ignore all warnings about private or protected member access in test folders
-]
-
-per-file-ignores."tests/*.py" = [
+# Ingore various rulesets in test and plugins directories
+"{plugins,tests,tests_isolated}/*.py" = [
     "ANN",  # Ignore all type annotation rules in test folders
     "ARG",  # Ignore all unused argument warnings in test folders
     "D",    # Ignore all pydocstyle rules in test folders
     "E501", # Line too long
     "S",    # Ignore all Security rules in test folders
     "SLF",  # Ignore all warnings about private or protected member access in test folders
 ]
-
-per-file-ignores."tests/pyscript/*.py" = [
-    "F821",   # Undefined name `app`
-    "INP001", # Module is part of an implicit namespace
-]
-
-per-file-ignores."tests_isolated/*.py" = [
-    "ANN", # Ignore all type annotation rules in test folders
-    "ARG", # Ignore all unused argument warnings in test folders
-    "D",   # Ignore all pydocstyle rules in test folders
-    "S",   # Ignore all Security rules in test folders
-    "SLF", # Ignore all warnings about private or protected member access in test folders
-]
+# Undefined name `app` and module is part of an implicit namespace
+"tests/pyscript/*.py" = ["F821", "INP001"]
 
 [tool.ruff.format]
 # Like Black, use double quotes for strings.