add examples

examples/packages/simple-example/lektor_simple.py

@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+from lektor.pluginsystem import Plugin
+from lektor.utils import slugify
+
+
+class SimpleGroupByPlugin(Plugin):
+    def on_groupby_after_build_all(self, groupby, builder, **extra):
+        @groupby.watch('/blog', 'testB', slug='simple/{group}/index.html',
+                       template='example-simple.html', flatten=True)
+        def convert_simple_example(args):
+            # Yield groups
+            value = args.field  # list type since model is 'strings' type
+            for tag in value:
+                yield slugify(tag), {'val': tag, 'tags_in_page': len(value)}
+            # Everything below is just for documentation purposes
+            page = args.record  # extract additional info from source
+            fieldKey, flowIndex, flowKey = args.key  # or get field index
+            if flowIndex is None:
+                obj = page[fieldKey]
+            else:
+                obj = page[fieldKey].blocks[flowIndex].get(flowKey)
+            print('page:', page)
+            print(' obj:', obj)
+            print()