Script to merge multiple PDFs, with sorting the files with natural sort

merge_pdfs.py

import os
import sys
from PyPDF2 import PdfMerger
from natsort import natsorted

def merge_pdfs(directory, output_filename):
    # Initialize PdfMerger
    merger = PdfMerger()

    # Get all PDF files in the directory
    pdf_files = [f for f in os.listdir(directory) if f.endswith('.pdf')]
    
    # Sort files using natural sort
    pdf_files = natsorted(pdf_files)

    # Merge PDFs
    for pdf in pdf_files:
        merger.append(os.path.join(directory, pdf))

    # Write the merged PDF to the output file
    merger.write(output_filename)
    merger.close()

    print(f"Merged PDF saved as {output_filename}")

if __name__ == "__main__":
    if len(sys.argv) != 3:
        print("Usage: python merge_pdfs.py <directory> <output_filename>")
        sys.exit(1)

    directory = sys.argv[1]
    output_filename = sys.argv[2]

    if not os.path.isdir(directory):
        print(f"Error: {directory} is not a valid directory.")
        sys.exit(1)

    merge_pdfs(directory, output_filename)