checkout: count and print -m paths separately

Since 0f086e6dca (checkout: print something when checking out paths -
2018-11-13), this command reports how many paths have been updated
from what source (either from a tree, or from the index). I forget
that there's a third source: when -m is used, the merge conflict is
re-created (granted, also from the index, but it's not a straight copy
from the index).

Count and report unmerged paths separately. There's a bit more update
to avoid reporting:

   Recreated X merge conflicts
   Updated 0 paths from the index

The second line is unnecessary. Though if there's no conflict
recreation, we still report

   Updated 0 paths from the index

to make it clear we're not really doing anything.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/checkout.c

@@ -259,7 +259,7 @@ static int checkout_paths(const struct checkout_opts *opts,
 	struct commit *head;
 	int errs = 0;
 	struct lock_file lock_file = LOCK_INIT;
-	int nr_checkouts = 0;
+	int nr_checkouts = 0, nr_unmerged = 0;
 
 	if (opts->track != BRANCH_TRACK_UNSPECIFIED)
 		die(_("'%s' cannot be used with updating paths"), "--track");
@@ -384,13 +384,18 @@ static int checkout_paths(const struct checkout_opts *opts,
 						       &state, &nr_checkouts);
 			else if (opts->merge)
 				errs |= checkout_merged(pos, &state,
-							&nr_checkouts);
+							&nr_unmerged);
 			pos = skip_same_name(ce, pos) - 1;
 		}
 	}
 	errs |= finish_delayed_checkout(&state, &nr_checkouts);
 
 	if (opts->count_checkout_paths) {
+		if (nr_unmerged)
+			fprintf_ln(stderr, Q_("Recreated %d merge conflict",
+					      "Recreated %d merge conflicts",
+					      nr_unmerged),
+				   nr_unmerged);
 		if (opts->source_tree)
 			fprintf_ln(stderr, Q_("Updated %d path from %s",
 					      "Updated %d paths from %s",
@@ -398,7 +403,7 @@ static int checkout_paths(const struct checkout_opts *opts,
 				   nr_checkouts,
 				   find_unique_abbrev(&opts->source_tree->object.oid,
 						      DEFAULT_ABBREV));
-		else
+		else if (!nr_unmerged || nr_checkouts)
 			fprintf_ln(stderr, Q_("Updated %d path from the index",
 					      "Updated %d paths from the index",
 					      nr_checkouts),