[PATCH 1/7] merge-ort: extract handling of priv member into reusable function

["Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Elijah Newren <newren@gmail.com>

In preparation for a subsequent commit which will ensure we do not
forget to maintain our invariants for the priv member in error
codepaths, extract the necessary functionality out into a separate
function.  This change is cosmetic at this point, and introduces no
changes beyond an extra assertion sanity check.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-ort.c | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/merge-ort.c b/merge-ort.c
index eaede6cead9..10f5a655f29 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -5000,6 +5000,28 @@ static void merge_check_renames_reusable(struct merge_result *result,
 
 /*** Function Grouping: merge_incore_*() and their internal variants ***/
 
+static void move_opt_priv_to_result_priv(struct merge_options *opt,
+					 struct merge_result *result)
+{
+	/*
+	 * opt->priv and result->priv are a bit weird.  opt->priv contains
+	 * information that we can re-use in subsequent merge operations to
+	 * enable our cached renames optimization.  The best way to provide
+	 * that to subsequent merges is putting it in result->priv.
+	 * However, putting it directly there would mean retrofitting lots
+	 * of functions in this file to also take a merge_result pointer,
+	 * which is ugly and annoying.  So, we just make sure at the end of
+	 * the merge (the outer merge if there are internal recursive ones)
+	 * to move it.
+	 */
+	assert(opt->priv && !result->priv);
+	if (!opt->priv->call_depth) {
+		result->priv = opt->priv;
+		result->_properly_initialized = RESULT_INITIALIZED;
+		opt->priv = NULL;
+	}
+}
+
 /*
  * Originally from merge_trees_internal(); heavily adapted, though.
  */
@@ -5060,11 +5082,7 @@ static void merge_ort_nonrecursive_internal(struct merge_options *opt,
 		/* existence of conflicted entries implies unclean */
 		result->clean &= strmap_empty(&opt->priv->conflicted);
 	}
-	if (!opt->priv->call_depth) {
-		result->priv = opt->priv;
-		result->_properly_initialized = RESULT_INITIALIZED;
-		opt->priv = NULL;
-	}
+	move_opt_priv_to_result_priv(opt, result);
 }
 
 /*
-- 
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