sparse-checkout: enable reapply to take --[no-]{cone,sparse-index}

Folks may want to switch to or from cone mode, or to or from a
sparse-index without changing their sparsity paths.  Allow them to do so
using the reapply command.

Reviewed-by: Derrick Stolee <[email protected]>
Reviewed-by: Victoria Dye <[email protected]>
Signed-off-by: Elijah Newren <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: newren

builtin/sparse-checkout.c

@@ -759,13 +759,22 @@ static int sparse_checkout_set(int argc, const char **argv, const char *prefix)
 }
 
 static char const * const builtin_sparse_checkout_reapply_usage[] = {
-	N_("git sparse-checkout reapply"),
+	N_("git sparse-checkout reapply [--[no-]cone] [--[no-]sparse-index] "),
 	NULL
 };
 
+static struct sparse_checkout_reapply_opts {
+	int cone_mode;
+	int sparse_index;
+} reapply_opts;
+
 static int sparse_checkout_reapply(int argc, const char **argv)
 {
 	static struct option builtin_sparse_checkout_reapply_options[] = {
+		OPT_BOOL(0, "cone", &reapply_opts.cone_mode,
+			 N_("initialize the sparse-checkout in cone mode")),
+		OPT_BOOL(0, "sparse-index", &reapply_opts.sparse_index,
+			 N_("toggle the use of a sparse index")),
 		OPT_END(),
 	};
 
@@ -777,6 +786,13 @@ static int sparse_checkout_reapply(int argc, const char **argv)
 			     builtin_sparse_checkout_reapply_usage, 0);
 
 	repo_read_index(the_repository);
+
+	reapply_opts.cone_mode = -1;
+	reapply_opts.sparse_index = -1;
+
+	if (update_modes(&reapply_opts.cone_mode, &reapply_opts.sparse_index))
+		return 1;
+
 	return update_working_directory(NULL);
 }