[PATCH v4 1/3] merge-ort: copy a few small helper functions from merge-recursive.c

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

From: Elijah Newren <newren@gmail.com>

In a subsequent commit, we will implement the traditional recursiveness
that gave merge-recursive its name, namely merging non-unique
merge-bases to come up with a single virtual merge base.  Copy a few
helper functions from merge-recursive.c that we will use in the
implementation.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-ort.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/merge-ort.c b/merge-ort.c
index 414e7b7eeac..b66f8a6f100 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -17,8 +17,10 @@
 #include "cache.h"
 #include "merge-ort.h"
 
+#include "alloc.h"
 #include "blob.h"
 #include "cache-tree.h"
+#include "commit.h"
 #include "commit-reach.h"
 #include "diff.h"
 #include "diffcore.h"
@@ -1348,6 +1350,36 @@ void merge_finalize(struct merge_options *opt,
 
 /*** Function Grouping: helper functions for merge_incore_*() ***/
 
+static inline void set_commit_tree(struct commit *c, struct tree *t)
+{
+	c->maybe_tree = t;
+}
+
+MAYBE_UNUSED
+static struct commit *make_virtual_commit(struct repository *repo,
+					  struct tree *tree,
+					  const char *comment)
+{
+	struct commit *commit = alloc_commit_node(repo);
+
+	set_merge_remote_desc(commit, comment, (struct object *)commit);
+	set_commit_tree(commit, tree);
+	commit->object.parsed = 1;
+	return commit;
+}
+
+MAYBE_UNUSED
+static struct commit_list *reverse_commit_list(struct commit_list *list)
+{
+	struct commit_list *previous = NULL, *current, *backup;
+	for (current = list; current; current = backup) {
+		backup = current->next;
+		current->next = previous;
+		previous = current;
+	}
+	return previous;
+}
+
 static void merge_start(struct merge_options *opt, struct merge_result *result)
 {
 	/* Sanity checks on opt */
-- 
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