additional error handling; use path buffers; improve logic

demo/tmpl/ex-edge-r/chassis.tmpl

@@ -1,5 +0,0 @@
-chassis {
-    users {
-        {{ username }};
-    }
-}

demo/tmpl/ex-edge-r/interfaces.tera

@@ -0,0 +1,8 @@
+interfaces {
+{%- set interfaces = uplinks | default(value=[uplink]) %}
+{%- for interace in interfaces %}
+    {{ interace }} {
+        unit 0 family inet dhcp;
+    }
+{%- endfor %}
+}

demo/tmpl/ex-edge-r/interfaces.tmpl

@@ -1,4 +0,0 @@
-interfaces {
-    {{ uplink }} {
-    }
-}

demo/tmpl/ex-edge-r/protocols.tera

@@ -0,0 +1,3 @@
+protocols {
+    {{ protocol }};
+}

demo/tmpl/ex-edge-r/protocols.tmpl

@@ -1,4 +0,0 @@
-protocols {
-    {{ protocol }} {
-    }
-}

demo/tmpl/ex-edge-r/structure.yaml

@@ -1,5 +1,4 @@
 files:
   - system
-  - chassis
   - interfaces
   - protocols

demo/tmpl/ex-edge-r/system.tera

@@ -0,0 +1,8 @@
+system {
+    hostname {{ hostname }};
+    location "{{ location }}";
+    zone {{ zone }};
+    users {
+      {{ username }};
+    }
+}

demo/tmpl/ex-edge-r/system.tmpl

@@ -1 +0,0 @@
-../common/ex/system.tmpl