Make /resto deal with vegan and unrecognized kinds

Better to show a fallback category if a kind isn't recognized than
nothing at all!

The code is refactored to have a table definition in RESTO_TABLES, this
allows to DRY when recognizing unrecognized meals (hah).

The ** operator is used to copy dicts while being able to amend them:
{**meal, "name": …} is a copy of meal but with a different name.

app/app.py

@@ -246,12 +246,24 @@ RESTO_TEMPLATE = """
 
 ## Vegetoarisch
 {vegi_table}
-
+{uncategorized}
 ## Groensels
 {vegetable_table}
 
 """
 
+UNCATEGORIZED_TEMPLATE = """
+## Nog etwad anders...
+{}
+"""
+
+RESTO_TABLES = {
+    "soup_table": {"soup"},
+    "meat_table": {"meat"},
+    "fish_table": {"fish"},
+    "vegi_table": {"vegetarian", "vegan"},
+}
+
 @app.route('/resto', methods=['GET'])
 def resto_menu():
     today = datetime.today()
@@ -262,11 +274,14 @@ def resto_menu():
     if not resto["open"]:
         return 'De resto is vandaag gesloten.'
     else:
-        def table_for(kind):
-            items = [meal for meal in resto["meals"] if meal["kind"] == kind]
-            if len(items) == 0:
+        def table_for(kinds):
+            items = [meal for meal in resto["meals"] if meal["kind"] in kinds]
+            return format_items(items)
+
+        def format_items(items):
+            if not items:
                 return "None :("
-            maxwidth = max(map(lambda item: len(item["name"]), items))
+            maxwidth = max(len(item["name"]) for item in items)
             return "\n".join("{name: <{width}}{price}".format(
                     name=item["name"],
                     width=maxwidth + 2,
@@ -274,11 +289,24 @@ def resto_menu():
                 for item in items
                 )
 
+        recognized_kinds = set.union(*RESTO_TABLES.values())
+        uncategorized_meals = [
+                meal for meal in resto["meals"]
+                if meal["kind"] not in recognized_kinds
+                ]
+
+        uncategorized = "" if not uncategorized_meals else \
+            UNCATEGORIZED_TEMPLATE.format(
+                format_items([
+                    # Small hack: change "name" into "name (kind)"
+                    {**meal, "name": "{} ({})".format(meal["name"], meal["kind"])}
+                    for meal in uncategorized_meals
+                ])
+            )
+
         return RESTO_TEMPLATE.format(
-                soup_table=table_for("soup"),
-                meat_table=table_for("meat"),
-                fish_table=table_for("fish"),
-                vegi_table=table_for("vegetarian"),
+                **{k: table_for(v) for k,v in RESTO_TABLES.items()},
+                uncategorized=uncategorized,
                 vegetable_table="\n".join(resto["vegetables"])
                 )