Update app.py

app.py

@@ -10,7 +10,7 @@ from PIL import Image
 import fitz  # PyMuPDF
 
 from reportlab.lib.pagesizes import A4
-from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, PageBreak
+from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle
 from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
 from reportlab.lib import colors
 from reportlab.pdfbase import pdfmetrics
@@ -27,12 +27,18 @@ available_fonts = {
     "NotoEmoji SemiBold": "NotoEmoji-SemiBold.ttf"
 }
 
-# Sidebar: Let the user choose the NotoEmoji font.
-selected_font_name = st.sidebar.selectbox(
-    "Select NotoEmoji Font",
-    options=list(available_fonts.keys())
-)
-selected_font_path = available_fonts[selected_font_name]
+# Sidebar: Font selection and size adjustment.
+with st.sidebar:
+    selected_font_name = st.selectbox(
+        "Select NotoEmoji Font",
+        options=list(available_fonts.keys())
+    )
+    selected_font_path = available_fonts[selected_font_name]
+    
+    auto_size = st.checkbox("Auto-size text", value=True)
+    base_font_size = st.slider("Base Font Size (points)", min_value=6, max_value=16, value=10, step=1)
+    if auto_size:
+        st.info("Font size will adjust between 6-16 points based on content length, starting from your base size.")
 
 # Register the chosen emoji font with ReportLab.
 pdfmetrics.registerFont(TTFont(selected_font_name, selected_font_path))
@@ -216,7 +222,7 @@ default_markdown = """# 🌟 Deities Guide: Mythology and Moral Lessons 🌟
 """
 
 # ---------------------------------------------------------------
-# Process markdown into a two-page layout based on line count.
+# Process markdown into a two-column layout for a double-page spread.
 def markdown_to_pdf_content(markdown_text):
     lines = markdown_text.strip().split('\n')
     pdf_content = []
@@ -261,30 +267,31 @@ def markdown_to_pdf_content(markdown_text):
     if current_item and sub_items:
         pdf_content.append([current_item, sub_items])
     
-    # Split based on line count, erring on left side longer.
+    # Split into two columns (left and right) based on line count.
     total_lines = sum(1 + len(subs) if isinstance(item, list) else 1 for item in pdf_content)
     target_lines = total_lines // 2
-    page1_content = []
-    page2_content = []
+    left_column = []
+    right_column = []
     current_lines = 0
     
     for item in pdf_content:
         line_count = 1 + (len(item[1]) if isinstance(item, list) else 0)
-        if current_lines <= target_lines or len(page1_content) == 0:
-            page1_content.append(item)
+        if current_lines < target_lines or len(left_column) == 0:
+            left_column.append(item)
             current_lines += line_count
         else:
-            page2_content.append(item)
+            right_column.append(item)
     
-    return page1_content, page2_content
+    return left_column, right_column
 
 # ---------------------------------------------------------------
-# Create the PDF with two pages.
+# Create the PDF as a double-page spread.
 def create_main_pdf(markdown_text, base_font_size=10, auto_size=False):
     buffer = io.BytesIO()
+    # Double-page spread: Two A4 pages side-by-side (landscape).
     doc = SimpleDocTemplate(
         buffer, 
-        pagesize=A4,
+        pagesize=(A4[1] * 2, A4[0]),  # Width = 2 * A4 width, Height = A4 height
         leftMargin=36,
         rightMargin=36,
         topMargin=36,
@@ -294,16 +301,16 @@ def create_main_pdf(markdown_text, base_font_size=10, auto_size=False):
     styles = getSampleStyleSheet()
     story = []
     spacer_height = 10
-    page1_content, page2_content = markdown_to_pdf_content(markdown_text)
+    left_column, right_column = markdown_to_pdf_content(markdown_text)
     
-    total_items = sum(1 + len(subs) if isinstance(item, list) else 1 for item in page1_content + page2_content)
+    total_items = sum(1 + len(subs) if isinstance(item, list) else 1 for item in left_column + right_column)
     if auto_size:
-        base_font_size = max(6, min(12, 400 / total_items))  # Adjusted for two pages.
+        base_font_size = max(6, min(16, base_font_size * 200 / total_items))  # Scale based on user’s base size.
     
     item_font_size = base_font_size
     subitem_font_size = base_font_size * 0.9
     section_font_size = base_font_size * 1.2
-    title_font_size = min(16, base_font_size * 1.5)
+    title_font_size = min(20, base_font_size * 1.5)
     
     # Define ParagraphStyles using Helvetica for normal text.
     title_style = ParagraphStyle(
@@ -344,40 +351,59 @@ def create_main_pdf(markdown_text, base_font_size=10, auto_size=False):
         spaceAfter=1
     )
     
-    # Page 1
+    # Title spanning both columns.
     story.append(Paragraph(apply_emoji_font("Deities Guide: Mythology and Moral Lessons", selected_font_name), title_style))
     story.append(Spacer(1, spacer_height))
     
-    for item in page1_content:
+    # Prepare two-column layout.
+    left_cells = []
+    for item in left_column:
         if isinstance(item, str) and item.startswith('<b>'):
             text = item.replace('<b>', '').replace('</b>', '')
-            story.append(Paragraph(apply_emoji_font(text, selected_font_name), section_style))
+            left_cells.append(Paragraph(apply_emoji_font(text, selected_font_name), section_style))
         elif isinstance(item, list):
             main_item, sub_items = item
-            story.append(Paragraph(apply_emoji_font(main_item, selected_font_name), item_style))
+            left_cells.append(Paragraph(apply_emoji_font(main_item, selected_font_name), item_style))
             for sub_item in sub_items:
-                story.append(Paragraph(apply_emoji_font(sub_item, selected_font_name), subitem_style))
+                left_cells.append(Paragraph(apply_emoji_font(sub_item, selected_font_name), subitem_style))
         else:
-            story.append(Paragraph(apply_emoji_font(item, selected_font_name), item_style))
+            left_cells.append(Paragraph(apply_emoji_font(item, selected_font_name), item_style))
     
-    story.append(PageBreak())  # Explicitly move to Page 2.
-    
-    # Page 2
-    story.append(Paragraph(apply_emoji_font("Deities Guide: Continued", selected_font_name), title_style))
-    story.append(Spacer(1, spacer_height))
-    
-    for item in page2_content:
+    right_cells = []
+    for item in right_column:
         if isinstance(item, str) and item.startswith('<b>'):
             text = item.replace('<b>', '').replace('</b>', '')
-            story.append(Paragraph(apply_emoji_font(text, selected_font_name), section_style))
+            right_cells.append(Paragraph(apply_emoji_font(text, selected_font_name), section_style))
         elif isinstance(item, list):
             main_item, sub_items = item
-            story.append(Paragraph(apply_emoji_font(main_item, selected_font_name), item_style))
+            right_cells.append(Paragraph(apply_emoji_font(main_item, selected_font_name), item_style))
             for sub_item in sub_items:
-                story.append(Paragraph(apply_emoji_font(sub_item, selected_font_name), subitem_style))
+                right_cells.append(Paragraph(apply_emoji_font(sub_item, selected_font_name), subitem_style))
         else:
-            story.append(Paragraph(apply_emoji_font(item, selected_font_name), item_style))
+            right_cells.append(Paragraph(apply_emoji_font(item, selected_font_name), item_style))
+    
+    # Balance the columns by padding with empty strings.
+    max_cells = max(len(left_cells), len(right_cells))
+    left_cells.extend([""] * (max_cells - len(left_cells)))
+    right_cells.extend([""] * (max_cells - len(right_cells)))
     
+    # Create a table for the double-page spread.
+    table_data = list(zip(left_cells, right_cells))
+    col_width = (A4[1] - 36)  # Half the spread width minus margins.
+    table = Table(table_data, colWidths=[col_width, col_width], hAlign='CENTER')
+    table.setStyle(TableStyle([
+        ('VALIGN', (0, 0), (-1, -1), 'TOP'),
+        ('ALIGN', (0, 0), (-1, -1), 'LEFT'),
+        ('BACKGROUND', (0, 0), (-1, -1), colors.white),
+        ('GRID', (0, 0), (-1, -1), 0, colors.white),
+        ('LINEAFTER', (0, 0), (0, -1), 0.5, colors.grey),  # Divider between columns.
+        ('LEFTPADDING', (0, 0), (-1, -1), 2),
+        ('RIGHTPADDING', (0, 0), (-1, -1), 2),
+        ('TOPPADDING', (0, 0), (-1, -1), 1),
+        ('BOTTOMPADDING', (0, 0), (-1, -1), 1),
+    ]))
+    
+    story.append(table)
     doc.build(story)
     buffer.seek(0)
     return buffer.getvalue()
@@ -399,15 +425,6 @@ def pdf_to_image(pdf_bytes):
         return None
 
 # ---------------------------------------------------------------
-# Sidebar options for text size.
-with st.sidebar:
-    auto_size = st.checkbox("Auto-size text", value=True)
-    if not auto_size:
-        base_font_size = st.slider("Base Font Size (points)", min_value=6, max_value=16, value=10, step=1)
-    else:
-        base_font_size = 10
-        st.info("Font size will auto-adjust between 6-12 points based on content length.")
-
 # Persist markdown content in session state.
 if 'markdown_content' not in st.session_state:
     st.session_state.markdown_content = default_markdown
@@ -422,7 +439,7 @@ with st.container():
     pdf_images = pdf_to_image(pdf_bytes)
     if pdf_images:
         for i, img in enumerate(pdf_images):
-            st.image(img, caption=f"Page {i+1}", use_container_width=True)
+            st.image(img, caption=f"Double-Page Spread", use_container_width=True)
     else:
         st.info("Download the PDF to view it locally.")
 
@@ -430,7 +447,7 @@ with st.container():
 st.download_button(
     label="Download PDF",
     data=pdf_bytes,
-    file_name="deities_guide.pdf",
+    file_name="deities_guide_double_page.pdf",
     mime="application/pdf"
 )