Add search_fields attribute to Summary class

This commit adds the `search_fields` attribute to the Summary class.
The `search_fields` attribute can be accessed to retrieve the last item
search related fields.

Signed-off-by: Jose Javier Merchante <jjmerchante@bitergia.com>

perceval/backend.py

@@ -1035,6 +1035,7 @@ def __init__(self):
         self.max_offset = None
         self.last_offset = None
         self.extras = None
+        self.last_search_fields = None
 
     @property
     def total(self):
@@ -1061,6 +1062,8 @@ def update(self, item):
             self.min_offset = offset if self.min_offset is None else min(self.min_offset, offset)
             self.max_offset = offset if self.max_offset is None else max(self.max_offset, offset)
 
+        self.last_search_fields = item.get('search_fields', None)
+
 
 def uuid(*args):
     """Generate a UUID based on the given parameters.

releases/unreleased/include-recovery-mode-for-git-backend.yml

@@ -0,0 +1,12 @@
+---
+title: Include recovery mode for Git backend
+category: added
+author: null
+issue: null
+notes: >
+  Include a new option in Git that allows continuing
+  to fetch commits from the previous execution using the last
+  commit. The option is `--recovery <commit>`.
+
+  The last commit can be obtained from the summary object
+  of the last execution or the last item.

tests/test_backend.py

@@ -1884,6 +1884,7 @@ def test_init(self):
         self.assertIsNone(summary.max_offset)
         self.assertIsNone(summary.last_offset)
         self.assertIsNone(summary.extras)
+        self.assertIsNone(summary.last_search_fields)
 
     def test_update(self):
         """Test whether the method update properly works"""
@@ -1899,7 +1900,8 @@ def test_update(self):
             },
             {
                 "updated_on": 1483228700.0,
-                "uuid": "0fa16dc4edab9130a14914a8d797f634d13b4bb4"
+                "uuid": "0fa16dc4edab9130a14914a8d797f634d13b4bb4",
+                "search_fields": {"item_id": "08c2fc9c870c704a9e778db582f1ac98063f3198"}
             }
         ]
 
@@ -1917,6 +1919,7 @@ def test_update(self):
         self.assertIsNone(summary.min_offset)
         self.assertIsNone(summary.max_offset)
         self.assertIsNone(summary.last_offset)
+        self.assertIsNone(summary.last_search_fields)
 
         item = items[1]
         summary.update(item)
@@ -1930,6 +1933,7 @@ def test_update(self):
         self.assertIsNone(summary.min_offset)
         self.assertIsNone(summary.max_offset)
         self.assertIsNone(summary.last_offset)
+        self.assertIsNone(summary.last_search_fields)
 
         item = items[2]
         summary.update(item)
@@ -1943,6 +1947,7 @@ def test_update(self):
         self.assertIsNone(summary.min_offset)
         self.assertIsNone(summary.max_offset)
         self.assertIsNone(summary.last_offset)
+        self.assertDictEqual(summary.last_search_fields, item['search_fields'])
 
     def test_update_offset(self):
         """Test whether the method update properly works on offset attributes"""