From 79a378feeb250452a35b9f96ed03f964061ad63d Mon Sep 17 00:00:00 2001
From: Greg Wilson <gvwilson@third-bit.com>
Date: Sun, 15 Sep 2024 17:01:54 -0400
Subject: [PATCH] feat: add error handling for missing H1 heading

---
 mccole/render.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mccole/render.py b/mccole/render.py
index 5777c1d..d9e554e 100644
--- a/mccole/render.py
+++ b/mccole/render.py
@@ -5,6 +5,7 @@
 from jinja2 import Environment, FileSystemLoader
 from markdown import markdown
 from pathlib import Path
+import sys
 
 from .util import find_files, get_inclusion, load_config, write_file
 
@@ -86,7 +87,11 @@ def do_tables(doc, source_path):
 
 def do_title(doc, source_path):
     """Make sure title element is filled in."""
-    doc.title.string = doc.h1.get_text()
+    try:
+        doc.title.string = doc.h1.get_text()
+    except Exception as exc:
+        print(f"{source_path} lacks H1 heading", file=sys.stderr)
+        sys.exit(1)
 
 
 def do_root_path_prefix(doc, source_path):