import os
import gradio as gr
import fitz

def merge(pdfs):
  
  os.makedirs("out", exist_ok = True)
  os.chdir("./out")
  
  result = fitz.open()
  
  for pdf in pdfs:
    with fitz.open(pdf) as mfile:
      result.insert_pdf(mfile)
      
  result.save("merge.pdf")
  
  file = "merge.pdf"
  
  return file

demo = gr.Interface(
  fn = merge,
  inputs = gr.Files(file_types = ["text",".pdf"]), 
  outputs = "file",
  theme = 'nuttea/Softblue',
  allow_flagging = "never"  
)

demo.queue(concurrency_count = 10)
demo.launch()