[PATCH 2/3] merge-tree: show the original file names in the conflict output

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

When showing the conflict output in an `ls-files -u`-style form, it
makes sense to show conflicted files' names in the form that they were
written on disk (for example, in case of a file/directory conflict, we
would have written the file under a different name by appending a
`~<branch>` suffix).

However, when the intention is to perform a worktree-less merge, this
makes less sense, and causes more confusion than is necessary. Let's
show the original file names instead.

This patch also fixes a bug where the output of conflicts involving a
rename did not always show the correct file name for the respective
stages.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 builtin/merge-tree.c             |  2 +-
 merge-ort.c                      |  2 +-
 merge-ort.h                      |  1 +
 t/t4301-merge-tree-write-tree.sh | 18 +++++++++---------
 4 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/builtin/merge-tree.c b/builtin/merge-tree.c
index ae5782917b9..8cd9ce399aa 100644
--- a/builtin/merge-tree.c
+++ b/builtin/merge-tree.c
@@ -454,8 +454,8 @@ static int real_merge(struct merge_tree_options *o,
 
 		merge_get_conflicted_files(&result, &conflicted_files);
 		for (i = 0; i < conflicted_files.nr; i++) {
-			const char *name = conflicted_files.items[i].string;
 			struct stage_info *c = conflicted_files.items[i].util;
+			const char *name = c->path;
 			if (!o->name_only)
 				printf("%06o %s %d\t",
 				       c->mode, oid_to_hex(&c->oid), c->stage);
diff --git a/merge-ort.c b/merge-ort.c
index 211f6823e1d..ed72d2e338e 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -4488,7 +4488,7 @@ void merge_get_conflicted_files(struct merge_result *result,
 			if (!(ci->filemask & (1ul << i)))
 				continue;
 
-			si = xmalloc(sizeof(*si));
+			FLEX_ALLOC_STR(si, path, ci->pathnames[i]);
 			si->stage = i+1;
 			si->mode = ci->stages[i].mode;
 			oidcpy(&si->oid, &ci->stages[i].oid);
diff --git a/merge-ort.h b/merge-ort.h
index a994c9a5fcd..595031fbab9 100644
--- a/merge-ort.h
+++ b/merge-ort.h
@@ -94,6 +94,7 @@ struct stage_info {
 	struct object_id oid;
 	int mode;
 	int stage;
+	const char path[FLEX_ARRAY];
 };
 
 /*
diff --git a/t/t4301-merge-tree-write-tree.sh b/t/t4301-merge-tree-write-tree.sh
index e0ef9724b2b..e08452a8531 100755
--- a/t/t4301-merge-tree-write-tree.sh
+++ b/t/t4301-merge-tree-write-tree.sh
@@ -125,7 +125,7 @@ test_expect_success 'test conflict notices and such' '
 	cat <<-EOF >expect &&
 	HASH
 	greeting
-	whatever~side1
+	whatever
 
 	Auto-merging greeting
 	CONFLICT (content): Merge conflict in greeting
@@ -153,7 +153,7 @@ test_expect_success 'Just the conflicted files without the messages' '
 	test_expect_code 1 git merge-tree --write-tree --no-messages --name-only side1 side2 >out &&
 	anonymize_hash out >actual &&
 
-	test_write_lines HASH greeting whatever~side1 >expect &&
+	test_write_lines HASH greeting whatever >expect &&
 
 	test_cmp expect actual
 '
@@ -168,14 +168,14 @@ test_expect_success 'Check conflicted oids and modes without messages' '
 	100644 HASH 1Qgreeting
 	100644 HASH 2Qgreeting
 	100644 HASH 3Qgreeting
-	100644 HASH 1Qwhatever~side1
-	100644 HASH 2Qwhatever~side1
+	100644 HASH 1Qwhatever
+	100644 HASH 2Qwhatever
 	EOF
 
 	test_cmp expect actual &&
 
 	# Check the actual hashes against the `ls-files -u` output too
-	tail -n +2 out | sed -e s/side1/HEAD/ >actual &&
+	tail -n +2 out | sed -e s/whatever/whatever~HEAD/ >actual &&
 	test_cmp conflicted-file-info actual
 '
 
@@ -200,11 +200,11 @@ test_expect_success 'NUL terminated conflicted file "lines"' '
 	100644 HASH 1Qgreeting
 	100644 HASH 2Qgreeting
 	100644 HASH 3Qgreeting
-	100644 HASH 1Qwhatever~tweak1
-	100644 HASH 2Qwhatever~tweak1
-	100644 HASH 1QΑυτά μου φαίνονται κινέζικα
+	100644 HASH 1Qwhatever
+	100644 HASH 2Qwhatever
+	100644 HASH 1Qnumbers
 	100644 HASH 2QΑυτά μου φαίνονται κινέζικα
-	100644 HASH 3QΑυτά μου φαίνονται κινέζικα
+	100644 HASH 3Qnumbers
 
 	EOF
 
-- 
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