ladder_compact_json_file

#!/usr/bin/env python
import json
import argparse

# Error codes
JSON_ERROR_OK = 0
JSON_ERROR_OPENFILE = 1
JSON_ERROR_PARSE = 2
JSON_ERROR_COMPACTFILE = 3
JSON_ERROR_WRITEFILE = 4

# Error messages
error_messages = {
    JSON_ERROR_OK: "Success",
    JSON_ERROR_OPENFILE: "Failed to open input file",
    JSON_ERROR_PARSE: "Failed to parse JSON",
    JSON_ERROR_COMPACTFILE: "Failed to compact JSON",
    JSON_ERROR_WRITEFILE: "Failed to write output file"
}

def ladder_compact_json_file(input_path, output_path):
    """
    Compact a JSON file by removing unnecessary whitespace.
    
    Args:
        input_path (str): Path to the input JSON file.
        output_path (str): Path to the output compacted JSON file.
    
    Returns:
        int: Error code indicating success or type of failure.
    """
    try:
        with open(input_path, 'r') as f:
            data = json.load(f)
    except FileNotFoundError:
        return JSON_ERROR_OPENFILE
    except json.JSONDecodeError:
        return JSON_ERROR_PARSE
    
    try:
        compact_json = json.dumps(data, separators=(',', ':'))
    except Exception:
        return JSON_ERROR_COMPACTFILE
    
    try:
        with open(output_path, 'w') as f:
            f.write(compact_json)
    except Exception:
        return JSON_ERROR_WRITEFILE
    
    return JSON_ERROR_OK

def main():
    parser = argparse.ArgumentParser(description="Compact a JSON file by removing unnecessary whitespace.")
    parser.add_argument("input", help="Path to the input JSON file")
    parser.add_argument("output", help="Path to the output compacted JSON file")
    args = parser.parse_args()

    result = ladder_compact_json_file(args.input, args.output)
    if result == JSON_ERROR_OK:
        print("JSON compacted successfully.")
    else:
        print(f"Error: {error_messages.get(result, 'Unknown error')}")

if __name__ == "__main__":
    main()