attempt to load resolved journal files

one step closer to actual functionality, attempt to load the resolved
markdown file in the instance directory, or 404 if it doesn't exist

incorporealcms/journal.py

@@ -1,5 +1,9 @@
 """Journal functionality."""
-from flask import Blueprint
+import logging
+
+from flask import Blueprint, abort, current_app as app
+
+logger = logging.getLogger(__name__)
 
 bp = Blueprint('journal', __name__, url_prefix='/')
 
@@ -7,7 +11,19 @@ bp = Blueprint('journal', __name__, url_prefix='/')
 @bp.route('/', defaults={'path': 'index'})
 @bp.route('/<path:path>')
 def display_journal_entry(path):
-    return path
+    """Get the file contents of the requested path and render the file."""
+    resolved_path = journal_file_resolver(path)
+    logger.info("received request for path '%s', resolved to '%s'", path, resolved_path)
+    try:
+        with app.open_instance_resource(resolved_path, 'r') as entry_file:
+            logger.debug("file '%s' found", resolved_path)
+    except FileNotFoundError:
+        logger.warning("requested path '%s' (resolved path '%s') not found!", path, resolved_path)
+        abort(404)
+    else:
+        return "OK"
+
+    return resolved_path
 
 
 def journal_file_resolver(path):