Fix debug screen.

main.py

@@ -1,6 +1,7 @@
 #!/usr/bin/python3
 """Check prices of ferries to France."""
 
+import collections
 import inspect
 import json
 import os
@@ -8,7 +9,6 @@ import os.path
 import re
 import sys
 import traceback
-import collections
 from datetime import date, datetime, timedelta
 from typing import Any
 
@@ -23,11 +23,6 @@ import ferry
 from ferry.api import get_accommodations, get_prices
 from ferry.read_config import ferry_config, vehicle_from_config
 
-# import werkzeug.exceptions
-# from werkzeug.debug.tbtools import DebugTraceback
-# from werkzeug.debug.tbtools import get_current_traceback
-
-
 app = flask.Flask(__name__)
 app.debug = True
 
@@ -87,24 +82,23 @@ def get_duration(depart: str, arrive: str, time_delta: int) -> str:
 
 
 @app.errorhandler(werkzeug.exceptions.InternalServerError)
-def exception_handler(e: Exception) -> tuple[str, int]:
-    """Show error page."""
+def exception_handler(e: werkzeug.exceptions.InternalServerError) -> tuple[str, int]:
+    """Handle exception."""
     exec_type, exc_value, current_traceback = sys.exc_info()
     assert exc_value
     tb = DebugTraceback(exc_value)
 
     summary = tb.render_traceback_html(include_title=False)
-    exc_lines = list(tb._te.format_exception_only())
+    exc_lines = "".join(tb._te.format_exception_only())
 
-    frames = [f for f, lineno in traceback.walk_tb(current_traceback)]
-    last_frame = frames[-1]
+    last_frame = list(traceback.walk_tb(current_traceback))[-1][0]
     last_frame_args = inspect.getargs(last_frame.f_code)
 
     return (
         flask.render_template(
             "show_error.html",
             plaintext=tb.render_traceback_text(),
-            exception="".join(exc_lines),
+            exception=exc_lines,
             exception_type=tb._te.exc_type.__name__,
             summary=summary,
             last_frame=last_frame,
@@ -114,23 +108,6 @@ def exception_handler(e: Exception) -> tuple[str, int]:
     )
 
 
-# @app.errorhandler(werkzeug.exceptions.InternalServerError)
-# def exception_handler(e):
-#     # tb = get_current_traceback()
-#     tb = DebugTraceback()
-#     last_frame = next(frame for frame in reversed(tb.frames) if not frame.is_library)
-#     last_frame_args = inspect.getargs(last_frame.code)
-#     return (
-#         flask.render_template(
-#             "show_error.html",
-#             tb=tb,
-#             last_frame=last_frame,
-#             last_frame_args=last_frame_args,
-#         ),
-#         500,
-#     )
-
-
 def parse_date(d: str) -> date:
     """Parse a date from a string in ISO format."""
     return datetime.strptime(d, "%Y-%m-%d").date()

templates/show_error.html

@@ -12,19 +12,12 @@
   <pre>{{ exception }}</pre>
 </div>
 
-{% set body %}
-URL: {{ request.url }}
-
-{{ tb.plaintext | safe }}
-{% endset %}
-
 <h2 class="traceback">Traceback <em>(most recent call last)</em></h2>
 {{ summary | safe }}
 
-{#
-<p>Error in function "{{ last_frame.function_name }}": {{ last_frame_args | pprint }}</p>
-<pre>{{ last_frame.locals | pprint }}</pre>
-#}
+<p>Error in function "{{ last_frame.f_code.co_name }}": {{ last_frame_args | pprint }}</p>
+<pre>{{ last_frame.f_locals | pprint }}</pre>
+
 </div>
 
 {% endblock %}