Add configuration files

.gitignore

@@ -5,3 +5,4 @@ elm-stuff
 static/jon.js
 __pycache__
 *.swp
+py/jon/config.json

py/jon/__init__.py

@@ -1,4 +1,5 @@
 import inspect
+import json
 
 from flask import Flask, render_template
 
@@ -7,9 +8,10 @@ from . import db, inventory, location, template_utils
 
 def create_app():
     app = Flask(__name__)
-    app.config.from_mapping(
-        SECRET_KEY="dev"
-    )
+    app.config.from_file("default-config.json", load=json.load)
+    # You don't need a config.json. If you don't provide one, default-config.json
+    # is used.
+    app.config.from_file("config.json", load=json.load, silent=True)
 
     db.init_app(app)
 

py/jon/db/__init__.py

@@ -1,6 +1,6 @@
 import psycopg2
 
-from flask import g
+from flask import current_app, g
 from pathlib import Path
 from psycopg2.extras import RealDictCursor
 
@@ -9,7 +9,7 @@ def get_db():
     if "db" not in g:
         # TODO: Make this configurable and use a default that works
         # on the pool computers.
-        g.db = psycopg2.connect("host=localhost dbname=garfield")
+        g.db = psycopg2.connect(current_app.config["DB_CONNECTION_STRING"])
         run_query_on(g.db, "add_views.sql", None)
 
     return g.db

py/jon/default-config.json

@@ -0,0 +1,4 @@
+{
+  "SECRET_KEY": "dev",
+  "DB_CONNECTION_STRING": "host=fsmi-db dbname=garfield"
+}

py/jon/templates/base.html

@@ -83,6 +83,13 @@
         </ul>
       </nav>
 
+      {% if config.DEBUG %}
+      <details>
+        <summary><code>config</code></summary>
+        <pre>{% for key, value in config.items() %}{{ key }} = {{ value }}
+{% endfor %}</pre>
+      </details>
+      {% endif %}
     </header>
 
     <main>