feat: added gradio

.gitignore

@@ -2,4 +2,6 @@ output
 images
 *.jpeg
 *.pdf 
-*.png
+*.png
+__pycache__
+.gradio

app.py

@@ -0,0 +1,73 @@
+import gradio as gr
+import fitz
+import numpy as np
+import tempfile
+import os
+
+def parse_page_selection(selection):
+    pages = set()
+    for part in selection.split(','):
+        if '-' in part:
+            start, end = map(int, part.split('-'))
+            pages.update(range(start - 1, end))  # Convert to 0-based index
+        else:
+            pages.add(int(part) - 1)  # Convert to 0-based index
+    return sorted(pages)
+
+def invert_colors(pix):
+    img = np.frombuffer(pix.samples, dtype=np.uint8)
+    img = 255 - img  # Invert colors
+    return fitz.Pixmap(pix.colorspace, pix.width, pix.height, img.tobytes(), pix.alpha)
+
+def invert_pdf_pages(input_pdf, output_pdf, page_selection):
+    pages_to_invert = parse_page_selection(page_selection)
+    doc = fitz.open(input_pdf)
+    
+    for page_num in pages_to_invert:
+        if 0 <= page_num < len(doc):
+            page = doc[page_num]
+            pix = page.get_pixmap()
+            inverted_pix = invert_colors(pix)
+            img_rect = page.rect
+            page.clean_contents()
+            page.insert_image(img_rect, stream=inverted_pix.tobytes())
+
+    doc.save(output_pdf)
+    doc.close()
+
+def invert_pdf_document(input_file, page_selection):
+    # If input_file is a file-like object, write its content to a temp file.
+    # Otherwise, assume it's a file path.
+    if hasattr(input_file, "read"):
+        with tempfile.NamedTemporaryFile(delete=False, suffix=".pdf") as tmp_in:
+            tmp_in.write(input_file.read())
+            tmp_in_path = tmp_in.name
+        cleanup = True
+    else:
+        tmp_in_path = input_file
+        cleanup = False
+
+    # Create a temporary file to save the inverted PDF.
+    with tempfile.NamedTemporaryFile(delete=False, suffix=".pdf") as tmp_out:
+        tmp_out_path = tmp_out.name
+
+    invert_pdf_pages(tmp_in_path, tmp_out_path, page_selection)
+
+    # Clean up temporary input file if it was created.
+    if cleanup:
+        os.remove(tmp_in_path)
+    return tmp_out_path
+
+iface = gr.Interface(
+    fn=invert_pdf_document,
+    inputs=[
+        gr.File(label="Input PDF"),
+        gr.Textbox(label="Page Selection", value="1-12,14-20,22-32,56,66-78,82-97")
+    ],
+    outputs=gr.File(label="Output PDF"),
+    title="PDF Color Inverter",
+    description="Upload a PDF and specify the pages to invert colors."
+)
+
+if __name__ == "__main__":
+    iface.launch(share=True)