Update app.py

app.py

@@ -14,22 +14,45 @@ from reportlab.lib import colors
 from reportlab.pdfbase import pdfmetrics
 from reportlab.pdfbase.ttfonts import TTFont
 
-# --- Step 1: Auto-download and register the emoji-supporting font ---
+# --- Step 1: Define and Download Available Emoji Fonts ---
+# List of available TTF filenames from the repository.
+font_files = [
+    "Noto-COLRv1-emojicompat.ttf",
+    "Noto-COLRv1-noflags.ttf",
+    "Noto-COLRv1.ttf",
+    "NotoColorEmoji-emojicompat.ttf",
+    "NotoColorEmoji-flagsonly.ttf",
+    "NotoColorEmoji-noflags.ttf",
+    "NotoColorEmoji.ttf",
+    "NotoColorEmoji_WindowsCompatible.ttf"
+]
 
-# URL for the Noto Emoji TTF file
-font_url = "https://github.com/googlefonts/noto-emoji/raw/main/fonts/NotoEmoji-Regular.ttf"
-font_path = "NotoEmoji-Regular.ttf"
+# Base URL to download the fonts from GitHub
+base_font_url = "https://github.com/googlefonts/noto-emoji/raw/main/fonts/"
 
-if not os.path.exists(font_path):
-    st.info("Downloading Noto Emoji font...")
-    try:
-        urllib.request.urlretrieve(font_url, font_path)
-        st.success("Noto Emoji font downloaded.")
-    except Exception as e:
-        st.error(f"Failed to download font: {e}")
+# Download each font if not already present.
+for font_file in font_files:
+    if not os.path.exists(font_file):
+        st.info(f"Downloading {font_file}...")
+        try:
+            urllib.request.urlretrieve(base_font_url + font_file, font_file)
+            st.success(f"Downloaded {font_file}")
+        except Exception as e:
+            st.error(f"Failed to download {font_file}: {e}")
+
+# --- Step 2: Allow User to Select the Emoji Font ---
+# Create a mapping for display (remove the .ttf extension for clarity)
+font_display_names = {f: f.replace(".ttf", "") for f in font_files}
+selected_font_file = st.sidebar.selectbox(
+    "Select Emoji Font",
+    options=font_files,
+    format_func=lambda f: font_display_names[f]
+)
 
-# Register the downloaded font with ReportLab under the name "NotoEmoji"
-pdfmetrics.registerFont(TTFont('NotoEmoji', font_path))
+# Register the selected font with ReportLab.
+# We use the display name (without .ttf) as the registered font name.
+registered_font_name = font_display_names[selected_font_file]
+pdfmetrics.registerFont(TTFont(registered_font_name, selected_font_file))
 
 # --- Streamlit App Setup ---
 st.set_page_config(layout="wide", initial_sidebar_state="collapsed")
@@ -102,7 +125,7 @@ default_markdown = """# Cutting-Edge ML Outline
     - Documentation synthesis
 """
 
-# --- Markdown to PDF content processing ---
+# --- Markdown to PDF Content Processing ---
 def markdown_to_pdf_content(markdown_text):
     lines = markdown_text.strip().split('\n')
     pdf_content = []
@@ -116,7 +139,7 @@ def markdown_to_pdf_content(markdown_text):
             continue
             
         if line.startswith('# '):
-            # Skip main title if desired
+            # Optionally, skip main title
             pass
         elif line.startswith('## '):
             if current_item and sub_items:
@@ -182,11 +205,11 @@ def create_main_pdf(markdown_text, base_font_size=10, auto_size=False):
     section_font_size = base_font_size * 1.2
     title_font_size = min(16, base_font_size * 1.5)
     
-    # Define styles using the emoji-supporting font "NotoEmoji"
+    # Define styles using the selected emoji-supporting font.
     title_style = ParagraphStyle(
         'Heading1',
         parent=styles['Heading1'],
-        fontName='NotoEmoji',
+        fontName=registered_font_name,
         textColor=colors.darkblue,
         alignment=1,
         fontSize=title_font_size
@@ -195,7 +218,7 @@ def create_main_pdf(markdown_text, base_font_size=10, auto_size=False):
     section_style = ParagraphStyle(
         'SectionStyle',
         parent=styles['Heading2'],
-        fontName='NotoEmoji',
+        fontName=registered_font_name,
         textColor=colors.darkblue,
         fontSize=section_font_size,
         leading=section_font_size * 1.2,
@@ -205,7 +228,7 @@ def create_main_pdf(markdown_text, base_font_size=10, auto_size=False):
     item_style = ParagraphStyle(
         'ItemStyle',
         parent=styles['Normal'],
-        fontName='NotoEmoji',
+        fontName=registered_font_name,
         fontSize=item_font_size,
         leading=item_font_size * 1.2,
         spaceAfter=1
@@ -214,7 +237,7 @@ def create_main_pdf(markdown_text, base_font_size=10, auto_size=False):
     subitem_style = ParagraphStyle(
         'SubItemStyle',
         parent=styles['Normal'],
-        fontName='NotoEmoji',
+        fontName=registered_font_name,
         fontSize=subitem_font_size,
         leading=subitem_font_size * 1.2,
         leftIndent=10,
@@ -280,7 +303,7 @@ def pdf_to_image(pdf_bytes):
     try:
         doc = fitz.open(stream=pdf_bytes, filetype="pdf")
         page = doc[0]
-        pix = page.get_pixmap(matrix=fitz.Matrix(2.0, 2.0))  # 2x zoom for clarity
+        pix = page.get_pixmap(matrix=fitz.Matrix(2.0, 2.0))
         img = Image.frombytes("RGB", [pix.width, pix.height], pix.samples)
         doc.close()
         return img
@@ -288,7 +311,7 @@ def pdf_to_image(pdf_bytes):
         st.error(f"Failed to render PDF preview: {e}")
         return None
 
-# --- Sidebar UI for Settings ---
+# --- Sidebar UI for Additional Settings ---
 with st.sidebar:
     auto_size = st.checkbox("Auto-size text", value=True)
     if not auto_size: