Add diff statistics calculation and display in compliance view template

Author: miaow2

netbox_config_diff/compliance/utils.py

@@ -60,3 +60,16 @@ def get_remediation_commands(name: str, platform: str, actual_config: str, rende
     host.load_running_config(config_text=actual_config)
     host.load_generated_config(config_text=rendered_config)
     return host.remediation_config_filtered_text(include_tags={}, exclude_tags={})
+
+
+def get_diff_statistics(diff: str) -> tuple[int, int]:
+    lines_added = 0
+    lines_deleted = 0
+
+    for line in diff.splitlines():
+        if line.startswith("+") and not line.startswith("+++"):
+            lines_added += 1
+        elif line.startswith("-") and not line.startswith("---"):
+            lines_deleted += 1
+
+    return lines_added, lines_deleted

netbox_config_diff/templates/netbox_config_diff/configcompliance/data.html

@@ -35,7 +35,14 @@ <h5 class="card-header">Error</h5>
     <div class="row mb-3">
       <div class="col col-md-12">
         <div class="card">
-          <h5 class="card-header">Diff</h5>
+          <h2 class="card-header">Diff
+            {% if version|first != "3" and statistics %}
+              <div class="card-actions">
+                <span style="color: #1a7f37;">{{ statistics.0 }}</span> line(s) missing,
+                <span style="color: #d1242f;">{{ statistics.1 }}</span> extra line(s)
+              </div>
+            {% endif %}
+          </h2>
           <div class="card-body" id="diffElement"></div>
         </div>
       </div>

netbox_config_diff/views/compliance.py

@@ -5,6 +5,7 @@
 from netbox.views import generic
 from utilities.views import ViewTab, register_model_view
 
+from netbox_config_diff.compliance.utils import get_diff_statistics
 from netbox_config_diff.filtersets import ConfigComplianceFilterSet, PlatformSettingFilterSet
 from netbox_config_diff.forms import (
     ConfigComplianceFilterForm,
@@ -25,10 +26,14 @@ class ConfigComplianceView(generic.ObjectView):
     template_name = "netbox_config_diff/configcompliance/data.html"
 
     def get_extra_context(self, request, instance):
+        statistics = None
+        if instance.diff:
+            statistics = get_diff_statistics(instance.diff)
         return {
             "instance": instance,
             "base_template": self.base_template,
             "version": VERSION,
+            "statistics": statistics,
         }