changeset 47333:f286d715f9ab

revlogv2: simplify and clarify the processing of each entry

As we add more entries and some of them has non trivial processing it seems
useful to make the processing leaner and clearly separated to simplify futures
patches.

Differential Revision: https://phab.mercurial-scm.org/D10773

--- a/mercurial/revlogutils/docket.py	Wed May 19 16:55:36 2021 +0200
+++ b/mercurial/revlogutils/docket.py	Thu May 20 21:48:53 2021 +0200
@@ -238,18 +238,29 @@
     """given some docket data return a docket object for the given revlog"""
     header = S_HEADER.unpack(data[: S_HEADER.size])
     offset = S_HEADER.size
-    version_header = header[0]
-    index_uuid_size = header[1]
+
+    iheader = iter(header)
+
+    version_header = next(iheader)
+
+    index_uuid_size = next(iheader)
     index_uuid = data[offset : offset + index_uuid_size]
     offset += index_uuid_size
-    data_uuid_size = header[2]
+
+    data_uuid_size = next(iheader)
     data_uuid = data[offset : offset + data_uuid_size]
     offset += data_uuid_size
-    index_size = header[3]
-    pending_index_size = header[4]
-    data_size = header[5]
-    pending_data_size = header[6]
-    default_compression_header = header[7]
+
+    index_size = next(iheader)
+
+    pending_index_size = next(iheader)
+
+    data_size = next(iheader)
+
+    pending_data_size = next(iheader)
+
+    default_compression_header = next(iheader)
+
     docket = RevlogDocket(
         revlog,
         use_pending=use_pending,