Flash message on action errors.

Closes #8.

reader/app.py

@@ -1,10 +1,10 @@
 import json
 from urllib.parse import urlparse, urljoin
 
-from flask import Flask, render_template, current_app, g, request, redirect, abort, Blueprint
+from flask import Flask, render_template, current_app, g, request, redirect, abort, Blueprint, flash
 import humanize
 
-from . import Reader
+from . import Reader, ReaderError
 
 
 blueprint = Blueprint('reader', __name__)
@@ -75,8 +75,13 @@ def dispatch(self):
         if self.really[func]:
             really = request.form.get('really')
             if really != 'really':
-                return "really not checked", 400
-        func()
+                flash("really not checked")
+                return redirect(next)
+        try:
+            func()
+        except ReaderError as e:
+            flash("error: {}".format(e))
+            return redirect(next)
         return redirect(next)
 
     def __call__(self, func=None, *, really=False):
@@ -147,6 +152,7 @@ def add_feed():
 def create_app(db_path):
     app = Flask(__name__)
     app.config['READER_DB'] = db_path
+    app.secret_key = 'secret'
     app.teardown_appcontext(close_db)
     app.register_blueprint(blueprint)
     return app

reader/templates/entries.html

@@ -41,6 +41,12 @@
 <br>
 
 
+{% with messages = get_flashed_messages() %}
+{% if messages %}
+<p id="messages"><b>{% for message in messages %}{{ message }}. {% endfor %}</b></p>
+{% endif %}
+{% endwith %}
+
 
 {% for feed, entry in entries %}
 

reader/templates/feeds.html

@@ -17,12 +17,18 @@
 <button type="submit" name="action" value="add-feed">add feed</button>
 
 <input type="hidden" name="next" value='{{ url_for('.feeds', **request.args) }}'>
-
 </small>
 </form>
 <br>
 
 
+{% with messages = get_flashed_messages() %}
+{% if messages %}
+<p id="messages"><b>{% for message in messages %}{{ message }}. {% endfor %}</b></p>
+{% endif %}
+{% endwith %}
+
+
 {% for feed in feeds %}
 
 <form action="{{ url_for('.update_entries') }}" method="post" id="feed-{{ loop.index }}" class="feed">