Redo breadcrumb logic to something less painful.

inventory/routes/helpers.py

@@ -4,12 +4,37 @@ import hashlib
 import io
 import os
 
-from flask import url_for, jsonify
+from flask import url_for, jsonify, request
+from flask import current_app as app
 
-from ..models import Inventory
+from ..models import User, Inventory, WorkLog
 
 from ..models.image import ImageAttachable
 
+ROUTE_BREADCRUMBS = {
+    'main.user': {
+        'trail': [('Users', 'main.list_users')],
+        'model': User,
+        'arg': 'id',
+        'label_attr': 'identifier',
+        'url_func': lambda i: url_for('main.user', id=i.id)
+    },
+    'main.inventory_item': {
+        'trail': [('Inventory', 'main.list_inventory')],
+        'model': Inventory,
+        'arg': 'id',
+        'label_attr': 'identifier',
+        'url_func': lambda i: url_for('main.inventory_item', id=i.id)
+    },
+    'main.worklog': {
+        'trail': [('Work Log', 'main.list_worklog')],
+        'model': WorkLog,
+        'arg': 'id',
+        'label_attr': 'identifier',
+        'url_func': lambda i: url_for('main.worklog', id=i.id)
+    }
+}
+
 inventory_headers = {
     "Date Entered": lambda i: {"text": i.timestamp.strftime("%Y-%m-%d") if i.timestamp else None},
     "Identifier": lambda i: {"text": i.identifier},
@@ -104,4 +129,35 @@ def make_csv(export_func, columns, rows):
         "success": True,
         "csv": base64.b64encode(csv_string.encode()).decode(),
         "count": len(rows)
-    })
+    })
+
+def generate_breadcrumbs():
+    crumbs = []
+
+    endpoint = request.endpoint
+    view_args = request.view_args or {}
+
+    if endpoint in ROUTE_BREADCRUMBS:
+        print(endpoint, view_args)
+        config = ROUTE_BREADCRUMBS[endpoint]
+
+        for label, ep in config.get('trail', []):
+            crumbs.append({'label': label, 'url': url_for(ep)})
+
+        obj_id = view_args.get(config['arg'])
+        if obj_id:
+            obj = config['model'].query.get(obj_id)
+            if obj:
+                crumbs.append({
+                    'label': getattr(obj, config['label_attr'], str(obj)),
+                    'url': config['url_func'](obj)
+                })
+    else:
+        # fallback to ugly slashes
+        path = request.path.strip('/').split('/')
+        accumulated = ''
+        for segment in path:
+            accumulated += '/' + segment
+            crumbs.append({'label': segment.title(), 'url': accumulated})
+
+    return crumbs