# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 2019-09-26 21:43:32
# Node ID f3bcae1e9e23460e5085cfea549f3aaa21ddb71c
# Parent  2cc453284d5c473dc722c1cca1d4ea403fc5ebd2

copies: expand the logic of usechangesetcentricalgo

Using intermediate variable is clearer and will make is simple to expand the
logic.

Differential Revision: https://phab.mercurial-scm.org/D6930

diff --git a/mercurial/copies.py b/mercurial/copies.py
--- a/mercurial/copies.py
+++ b/mercurial/copies.py
@@ -182,8 +182,9 @@ def _computeforwardmissing(a, b, match=N
 
 def usechangesetcentricalgo(repo):
     """Checks if we should use changeset-centric copy algorithms"""
-    return (repo.ui.config('experimental', 'copies.read-from') in
-            ('changeset-only', 'compatibility'))
+    readfrom = repo.ui.config('experimental', 'copies.read-from')
+    changesetsource = ('changeset-only', 'compatibility')
+    return readfrom in changesetsource
 
 def _committedforwardcopies(a, b, base, match):
     """Like _forwardcopies(), but b.rev() cannot be None (working copy)"""