import os
import re

# Directory containing the .txt files
directory = '.'

# Name of the output file
output_file = 'merged_content.txt'

# Collect and sort filenames numerically
file_list = []
for filename in os.listdir(directory):
    if filename.startswith('content_') and filename.endswith('.txt'):
        match = re.match(r'content_(\d+)\.txt', filename)
        if match:
            number = int(match.group(1))
            file_list.append((number, filename))

# Sort by the numeric part
file_list.sort()

# Write contents in order
with open(output_file, 'w', encoding='utf-8') as outfile:
    for _, filename in file_list:
        with open(os.path.join(directory, filename), 'r') as infile:
            outfile.write(infile.read())
            outfile.write('\n<!--pagebreak-->\n')  # Add a page break after each file

# Convert the merged text file to PDF using Calibre's ebook-convert
os.system("""ebook-convert merged_content.txt output.pdf --pdf-page-numbers""")