import os

import sys

import argparse

def flush_and_validate(filepath, expected_lines=None):

"""

Flushes the output of a file and performs basic sanity checks.

Args:

filepath (str): The path to the file.

expected_lines (list, optional): A list of expected lines. Defaults to None.

Returns:

bool: True if the flush was successful and the file contents are valid, False otherwise.

"""

try:

with open(filepath, 'r') as f:

content = f.read() # Read the file content

except FileNotFoundError:

print(f"Error: File not found at {filepath}", file=sys.stderr)

return False

# Flush the output (simulated by writing to a temporary file)

temp_filepath = f"{filepath}.tmp"

with open(temp_filepath, 'w') as temp_f:

temp_f.write(content)

os.replace(temp_filepath, filepath) # Replace original with temp file

if expected_lines:

lines = content.splitlines()

if lines != expected_lines:

print("Error: File content does not match expected lines.", file=sys.stderr)

print(f"Expected: {expected_lines}", file=sys.stderr)

print(f"Actual: {lines}", file=sys.stderr)

return False

else:

print("File flushed successfully and content appears valid.", file=sys.stderr)

return True

if __name__ == '__main__':

parser = argparse.ArgumentParser(description="Flush and validate file contents.")

parser.add_argument("filepath", help="Path to the file.")

parser.add_argument("--expected", nargs='+', help="Expected lines (optional).")

args = parser.parse_args()

if flush_and_validate(args.filepath, args.expected):

sys.exit(0) # Success

else:

sys.exit(1) # Failure