Runtime fixes for entrypoint

tools/package-puzzles.py

@@ -87,9 +87,10 @@ def generate_html(ziphandle, puzzle, puzzledir, category, points, authors, files
             points=points,
             body=puzzle.html_body(),
             file_content=file_content.getvalue(),
-        authors=', '.join(authors)),
+            authors=', '.join(authors),
             scripts='\n'.join(scripts),
 	)
+    )
     ziphandle.writestr(os.path.join(puzzledir, 'index.html'), html_content.getvalue())
 
 def build_category(categorydir, outdir):

www/cgi-bin/puzzler.cgi

@@ -11,7 +11,7 @@ local points = cgi.fields['p'] or ""
 local answer = cgi.fields['a'] or ""
 
 -- Defang category name; prevent directory traversal
-category = category:gsub("[^A-Za-z0-9]", "-")
+category = category:gsub("[^A-Za-z0-9_]", "-")
 
 -- Check answer
 local needle = points .. " " .. answer