[PATCH v3 10/15] merge-ort: provide a merge_get_conflicted_files() helper function

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

From: Elijah Newren <newren@gmail.com>

After a merge, this function allows the user to extract the same
information that would be printed by `ls-files -u`, which means
files with their mode, oid, and stage.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-ort.c | 31 +++++++++++++++++++++++++++++++
 merge-ort.h | 21 +++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/merge-ort.c b/merge-ort.c
index d28d1721d14..c4ce6027dc4 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -4275,6 +4275,37 @@ void merge_display_update_messages(struct merge_options *opt,
 	trace2_region_leave("merge", "display messages", opt->repo);
 }
 
+void merge_get_conflicted_files(struct merge_result *result,
+				struct string_list *conflicted_files)
+{
+	struct hashmap_iter iter;
+	struct strmap_entry *e;
+	struct merge_options_internal *opti = result->priv;
+
+	strmap_for_each_entry(&opti->conflicted, &iter, e) {
+		const char *path = e->key;
+		struct conflict_info *ci = e->value;
+		int i;
+
+		VERIFY_CI(ci);
+
+		for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
+			struct stage_info *si;
+
+			if (!(ci->filemask & (1ul << i)))
+				continue;
+
+			si = xmalloc(sizeof(*si));
+			si->stage = i+1;
+			si->mode = ci->stages[i].mode;
+			oidcpy(&si->oid, &ci->stages[i].oid);
+			string_list_append(conflicted_files, path)->util = si;
+		}
+	}
+	/* string_list_sort() uses a stable sort, so we're good */
+	string_list_sort(conflicted_files);
+}
+
 void merge_switch_to_result(struct merge_options *opt,
 			    struct tree *head,
 			    struct merge_result *result,
diff --git a/merge-ort.h b/merge-ort.h
index d643b47cb7c..e635a294ea8 100644
--- a/merge-ort.h
+++ b/merge-ort.h
@@ -2,6 +2,7 @@
 #define MERGE_ORT_H
 
 #include "merge-recursive.h"
+#include "hash.h"
 
 struct commit;
 struct tree;
@@ -89,6 +90,26 @@ void merge_display_update_messages(struct merge_options *opt,
 				   struct merge_result *result,
 				   FILE *stream);
 
+struct stage_info {
+	struct object_id oid;
+	int mode;
+	int stage;
+};
+
+/*
+ * Provide a list of path -> {struct stage_info*} mappings for
+ * all conflicted files.  Note that each path could appear up to three
+ * times in the list, corresponding to 3 different stage entries.  In short,
+ * this basically provides the info that would be printed by `ls-files -u`.
+ *
+ * result should have been populated by a call to
+ * one of the merge_incore_[non]recursive() functions.
+ *
+ * conflicted_files should be empty before calling this function.
+ */
+void merge_get_conflicted_files(struct merge_result *result,
+				struct string_list *conflicted_files);
+
 /* Do needed cleanup when not calling merge_switch_to_result() */
 void merge_finalize(struct merge_options *opt,
 		    struct merge_result *result);
-- 
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