Add comprehensive modern type hints and mypy strict mode integration

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Test with tox
       run: tox
 
-  lint-and-format:
+  lint-format-and-type-check:
     runs-on: ubuntu-latest
 
     steps:
@@ -50,3 +50,6 @@ jobs:
 
     - name: Check formatting with ruff
       run: tox -e format-check
+
+    - name: Type check with mypy
+      run: tox -e mypy

pyproject.toml

@@ -11,16 +11,14 @@ authors = [
 description = "Interactive sorting utility for text lines with various sorting options"
 readme = "README.md"
 license = {text = "MIT"}
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 classifiers = [
     "Development Status :: 4 - Beta",
     "Intended Audience :: Developers",
     "Intended Audience :: End Users/Desktop",
     "License :: OSI Approved :: MIT License",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -46,7 +44,7 @@ where = ["src"]
 # Ruff configuration
 [tool.ruff]
 line-length = 120
-target-version = "py38"
+target-version = "py310"
 
 [tool.ruff.lint]
 select = [
@@ -68,4 +66,21 @@ ignore = [
 quote-style = "double"
 indent-style = "space"
 skip-magic-trailing-comma = false
-line-ending = "auto"
+line-ending = "auto"
+
+# mypy configuration
+[tool.mypy]
+python_version = "3.10"
+strict = true
+warn_return_any = true
+warn_unused_configs = true
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+check_untyped_defs = true
+disallow_untyped_decorators = true
+no_implicit_optional = true
+warn_redundant_casts = true
+warn_unused_ignores = true
+warn_no_return = true
+warn_unreachable = true
+strict_equality = true

src/interactive_sort/__init__.py

@@ -1,9 +1,9 @@
 """Interactive Sort - A tool for interactively sorting lines of text."""
 
-__version__ = "1.0.0"
-__author__ = "MightyHelper"
-__description__ = "Interactive sorting utility for text lines with various sorting options"
+__version__: str = "1.0.0"
+__author__: str = "MightyHelper"
+__description__: str = "Interactive sorting utility for text lines with various sorting options"
 
 from .main import InteractiveSort, main
 
-__all__ = ["InteractiveSort", "main"]
+__all__: list[str] = ["InteractiveSort", "main"]

src/interactive_sort/main.py

@@ -4,14 +4,16 @@
 import os
 import re
 import sys
+from collections.abc import Callable
 from functools import cmp_to_key
+from typing import Any
 
 
 class InteractiveSort:
-    def __init__(self, args):
-        self.data = []
-        self.args = args
-        self.month_map = {
+    def __init__(self, args: argparse.Namespace) -> None:
+        self.data: list[str] = []
+        self.args: argparse.Namespace = args
+        self.month_map: dict[str, int] = {
             "JAN": 1,
             "FEB": 2,
             "MAR": 3,
@@ -26,11 +28,11 @@ def __init__(self, args):
             "DEC": 12,
         }
 
-    def get_sort_key(self, item):
+    def get_sort_key(self, item: str) -> str:
         """Generates a key for sorting based on the provided arguments."""
-        key = item
+        key: str = item
         if self.args.field_separator:
-            fields = key.split(self.args.field_separator)
+            fields: list[str] = key.split(self.args.field_separator)
             if fields:
                 key = fields[0]
             else:
@@ -42,35 +44,37 @@ def get_sort_key(self, item):
             key = "".join(filter(str.isprintable, key))
         return key
 
-    def month_sort_key(self, item):
+    def month_sort_key(self, item: str) -> int:
         """Extracts and converts the month from the beginning of the string (or first field)."""
-        text_to_check = item
+        text_to_check: str = item
         if self.args.field_separator:
-            fields = item.split(self.args.field_separator)
+            fields: list[str] = item.split(self.args.field_separator)
             if fields:
                 text_to_check = fields[0]
             else:
                 return 0
 
-        match = re.match(r"^(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)\s*", text_to_check, re.IGNORECASE)
+        match: re.Match[str] | None = re.match(r"^(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)\s*", text_to_check, re.IGNORECASE)
         if match:
             return self.month_map.get(match.group(1).upper(), 0)  # 0 for unknown
         return 0  # Treat lines without a month at the beginning as "unknown"
 
-    def human_numeric_sort_key(self, item):
+    def human_numeric_sort_key(self, item: str) -> float | str:
         """Converts a human-readable number string to a comparable tuple (or from the first field)."""
-        text_to_check = item
+        text_to_check: str = item
         if self.args.field_separator:
-            fields = item.split(self.args.field_separator)
+            fields: list[str] = item.split(self.args.field_separator)
             if fields:
                 text_to_check = fields[0]
             else:
                 return item  # Fallback
 
-        parts = re.findall(r"(\d+\.?\d*)([KMGTPEZY]?)", text_to_check, re.IGNORECASE)
+        parts: list[tuple[str, str]] = re.findall(r"(\d+\.?\d*)([KMGTPEZY]?)", text_to_check, re.IGNORECASE)
         if parts:
-            value, unit = parts[0]
-            value = float(value)
+            value_str: str
+            unit: str
+            value_str, unit = parts[0]
+            value: float = float(value_str)
             unit = unit.upper()
             if unit == "K":
                 value *= 1024
@@ -94,11 +98,11 @@ def human_numeric_sort_key(self, item):
         except ValueError:
             return text_to_check  # Keep original string if not convertible to number
 
-    def numeric_sort_key(self, item):
+    def numeric_sort_key(self, item: str) -> float | str:
         """Tries to convert the item (or first field) to a float for numeric sorting."""
-        text_to_check = item
+        text_to_check: str = item
         if self.args.field_separator:
-            fields = item.split(self.args.field_separator)
+            fields: list[str] = item.split(self.args.field_separator)
             if fields:
                 text_to_check = fields[0]
             else:
@@ -109,90 +113,87 @@ def numeric_sort_key(self, item):
         except ValueError:
             return text_to_check  # Keep original string if not a valid number
 
-    def compare_items(self, item1, item2):
+    def compare_items(self, item1: str, item2: str) -> int:
         """Compares two items based on the active sorting options."""
         if self.args.month_sort:
-            key1 = self.month_sort_key(item1)
-            key2 = self.month_sort_key(item2)
+            key1: int = self.month_sort_key(item1)
+            key2: int = self.month_sort_key(item2)
             if key1 != key2:
                 return key1 - key2
 
         if self.args.human_numeric_sort:
-            key1 = self.human_numeric_sort_key(item1)
-            key2 = self.human_numeric_sort_key(item2)
-            if isinstance(key1, (int, float)) and isinstance(key2, (int, float)):
-                if key1 != key2:
-                    return key1 - key2
+            key1_human: float | str = self.human_numeric_sort_key(item1)
+            key2_human: float | str = self.human_numeric_sort_key(item2)
+            if isinstance(key1_human, int | float) and isinstance(key2_human, int | float):
+                if key1_human != key2_human:
+                    return int(key1_human - key2_human)
 
         if self.args.numeric_sort:
-            key1 = self.numeric_sort_key(item1)
-            key2 = self.numeric_sort_key(item2)
-            if isinstance(key1, (int, float)) and isinstance(key2, (int, float)):
-                if key1 != key2:
-                    return key1 - key2
+            key1_numeric: float | str = self.numeric_sort_key(item1)
+            key2_numeric: float | str = self.numeric_sort_key(item2)
+            if isinstance(key1_numeric, int | float) and isinstance(key2_numeric, int | float):
+                if key1_numeric != key2_numeric:
+                    return int(key1_numeric - key2_numeric)
 
         # Default string comparison (after applying ignore-case and ignore-nonprinting)
-        key1 = self.get_sort_key(item1)
-        key2 = self.get_sort_key(item2)
-        if key1 < key2:
+        key1_str: str = self.get_sort_key(item1)
+        key2_str: str = self.get_sort_key(item2)
+        if key1_str < key2_str:
             return -1
-        elif key1 > key2:
+        elif key1_str > key2_str:
             return 1
         else:
             return 0
 
-    def add_item(self, item):
+    def add_item(self, item: str) -> None:
         """Adds an item to the sorted data using a custom comparison."""
         if not self.args.month_sort and not self.args.human_numeric_sort and not self.args.numeric_sort:
-
-            def key_func(x):
-                return self.get_sort_key(x)
-
+            key_func: Callable[[str], Any] = self.get_sort_key
         else:
             key_func = cmp_to_key(self.compare_items)
 
         bisect.insort_left(self.data, item, key=key_func)
 
-    def display_sorted(self):
+    def display_sorted(self) -> None:
         """Displays the current sorted data."""
         output_stream = sys.stderr if self.args.stderr else sys.stdout
 
         if not self.args.stderr:
             os.system("cls" if os.name == "nt" else "clear")
 
         print("--- Interactive Sorted Data ---", file=output_stream)
-        items_to_display = self.data
+        items_to_display: list[str] = self.data
         if self.args.unique:
             items_to_display = sorted(
                 set(items_to_display), key=lambda x: self.data.index(x)
             )  # Maintain original order of first occurrence
         if self.args.reverse:
-            items_to_display = reversed(items_to_display)
+            items_to_display = list(reversed(items_to_display))
 
         for item in items_to_display:
             print(item, file=output_stream)
         print("-----------------------------", file=output_stream)
 
-    def output_final_sorted(self):
+    def output_final_sorted(self) -> None:
         """Outputs the final sorted data to stdout (used when stderr flag is set)."""
-        items_to_display = self.data
+        items_to_display: list[str] = self.data
         if self.args.unique:
             items_to_display = sorted(
                 set(items_to_display), key=lambda x: self.data.index(x)
             )  # Maintain original order of first occurrence
         if self.args.reverse:
-            items_to_display = reversed(items_to_display)
+            items_to_display = list(reversed(items_to_display))
 
         for item in items_to_display:
             print(item, file=sys.stdout)
 
-    def run(self):
+    def run(self) -> None:
         """Runs the interactive sort application."""
         output_stream = sys.stderr if self.args.stderr else sys.stdout
         print("Enter lines of text. Press Ctrl+D (or Ctrl+Z then Enter on Windows) to finish.", file=output_stream)
         try:
             while True:
-                line = input()
+                line: str = input()
                 self.add_item(line)
                 self.display_sorted()
         except EOFError:
@@ -205,9 +206,9 @@ def run(self):
             print("\nExiting.", file=output_stream)
 
 
-def main():
+def main() -> None:
     """Main entry point for the interactive-sort command."""
-    parser = argparse.ArgumentParser(description="Interactively sort input lines.")
+    parser: argparse.ArgumentParser = argparse.ArgumentParser(description="Interactively sort input lines.")
     parser.add_argument("-f", "--ignore-case", action="store_true", help="fold lower case to upper case characters")
     parser.add_argument("-i", "--ignore-nonprinting", action="store_true", help="consider only printable characters")
     parser.add_argument("-M", "--month-sort", action="store_true", help="compare (unknown) < 'JAN' < ... < 'DEC'")
@@ -224,10 +225,11 @@ def main():
         default=None,
         help="use FIELD as the field separator when finding an ordering key",
     )
+    parser.add_argument("--stderr", action="store_true", help="output to stderr for debugging")
 
-    args = parser.parse_args()
+    args: argparse.Namespace = parser.parse_args()
 
-    sorter = InteractiveSort(args)
+    sorter: InteractiveSort = InteractiveSort(args)
     sorter.run()