initial commit

.gitignore

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+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+
+# Virtual environments
+.venv

README.md

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+# Mileage Report

mileage_rate.py

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+# /// script
+# requires-python = ">=3.12"
+# dependencies = ["typer", "rich", "xlwings"]
+# ///
+from contextlib import contextmanager
+from pathlib import Path
+from typing import Annotated
+
+import xlwings as xw
+import typer
+from rich.console import Console
+
+console = Console()
+
+
+def get_totals(book: xw.Book):
+    for sheet in book.sheets:
+        if sheet.name.endswith("Rate"):
+            continue
+        try:
+            total = float(sheet.range("S3").expand("down").value[-1])
+        except Exception as e:
+            console.print(f"[red]Error reading total from sheet {sheet.name}: {e}[/red]")
+            console.print_exception(show_locals=False)
+        else:
+            yield sheet.name, total
+
+
+def get_grand_total(book: xw.Book):
+    totals = dict(get_totals(book))
+    grand_total = sum(totals.values())
+    return grand_total
+
+
+@contextmanager
+def switch_values(book: xw.Book):
+    og_vals = book.sheets['GSA Rate'].range("B2").expand("down").value
+    try:
+        book.sheets['GSA Rate'].range("B2").expand("down").value = 0.70
+        yield
+    finally:
+        book.sheets['GSA Rate'].range("B2").expand("down").options(transpose=True).value = og_vals
+
+
+def get_diff(book: xw.Book):
+    book.sheets['GSA Rate'].range("B2:B10").value = 0.67
+    initial = get_grand_total(book)
+
+    with switch_values(book):
+        fixed = get_grand_total(book)
+
+    diff = round(fixed - initial, 2)
+    return diff
+
+
+def get_all_diffs(base: Path):
+    reports = [f for f in base.glob('*Mileage*.xlsx') if f.is_file() and not f.stem.startswith('~$')]
+    console.print(f"Found {len(reports)} report(s).")
+    for r in reports:
+        with console.status(f'Processing [bold blue]{r.name}[/bold blue]'):
+            console.print('Opening workbook...')
+            book = xw.Book(r)
+            try:
+                console.print('Calculating totals...')
+                diff = get_diff(book)
+                yield r.name, diff
+                console.print(f"[cyan]Report:[/] {r.name}")
+                console.print(f"  Difference after rate change: [bold green]${diff:.2f}[/]")
+            except Exception as e:
+                console.print(f"[red]Error processing {r.name}: {e}[/red]")
+            finally:
+                book.close()
+
+
+def main(
+    directory: Annotated[
+        Path,
+        typer.Argument(
+            exists=True,
+            file_okay=False,
+            dir_okay=True,
+            readable=True,
+            writable=True,
+            resolve_path=True
+        )
+    ] = None) -> None:
+    console.print(f"Processing files in directory: {directory}")
+    results = dict(get_all_diffs(directory))
+    with Path('results.csv').open('w', encoding='utf-8') as f:
+        f.write("Report,Difference\n")
+        for report, diff in results.items():
+            f.write(f'{report},{diff}\n')
+
+
+if __name__ == "__main__":
+    typer.run(main)