Add D/T matrix.

librestash/lib/stats/basic.py

@@ -23,3 +23,15 @@ def difficulty_count(db, geocacher):
 @stats_plugin
 def terrain_count(db, geocacher):
     return _field_count(db, geocacher, 'terrain')
+
+@stats_plugin
+def difficulty_terrain_count(db, geocacher):
+    res = {}
+
+    for cache in geocacher.found_geocaches:
+        combo = (cache.difficulty, cache.terrain)
+        if not combo in res:
+            res[combo] = 0
+        res[combo] += 1
+
+    return res

librestash/templates/stats/plugins/difficulty_terrain_matrix.html

+<table>
+ <tr>
+  <td></td>
+  {% for d in range(10, 55, 5) %}
+   <td>{{ d / 10 }}</td>
+  {% endfor %}
+  <td></td>
+ </tr>
+
+ {% for t in range(10, 55, 5) %}
+  <tr>
+   <td>{{ t / 10 }}</td>
+   {% for d in range(10, 55, 5) %}
+    <td>{{ data['difficulty_terrain_count'][(d / 10, t / 10)] }}</td>
+   {% endfor %}
+  </tr>
+ {% endfor %}
+</table>