Modularize code;

Add packaging instructions;
Add modules to handle Gemini file type (no Gemini server yet);
Improve handling of configuration.

json/index.py

@@ -0,0 +1,38 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+import json
+import os
+from rivista.xmpp.utilities import XmppUtilities
+
+class JsonIndex:
+
+    def generate_json(iq, directory_cache_json):
+        """Create a JSON file from node items."""
+        json_data = []
+        pubsub = iq['from'].bare
+        node = iq['pubsub']['items']['node']
+        entries = iq['pubsub']['items']
+        for entry in entries:
+            item_id = entry['id']
+            item_payload = entry['payload']
+            namespace = '{http://www.w3.org/2005/Atom}'
+            title = item_payload.find(namespace + 'title')
+            title_text = '*** No Title ***' if title == None else title.text
+            # updated = item.find(namespace + 'updated')
+            # updated = None if updated == None else updated.text
+            # if updated: updated = datetime.datetime.fromisoformat(updated)
+            link_href = XmppUtilities.form_an_item_link(pubsub, node, item_id)
+            # link = item.find(namespace + 'link')
+            # link_href = '' if link == None else link.attrib['href']
+            json_data_entry = {'title' : title_text,
+                               'link' : link_href}
+            json_data.append(json_data_entry)
+            #if len(json_data) > 6: break
+        directory = os.path.join(directory_cache_json, pubsub)
+        if not os.path.exists(directory):
+            os.mkdir(directory)
+        filename = os.path.join(directory_cache_json, pubsub, node)
+        
+        with open(filename, 'w', encoding='utf-8') as f:
+            json.dump(json_data, f, ensure_ascii=False, indent=4)