list-objects-filter: encapsulate filter components

Encapsulate filter_fn, filter_free_fn, and filter_data into their own
opaque struct.

Due to opaqueness, filter_fn and filter_free_fn can no longer be
accessed directly by users. Currently, all usages of filter_fn are
guarded by a necessary check:

	(obj->flags & NOT_USER_GIVEN) && filter_fn

Take the opportunity to include this check into the new function
list_objects_filter__filter_object(), so that we no longer need to write
this check at every caller of the filter function.

Also, the init functions in list-objects-filter.c no longer need to
confusingly return the filter constituents in various places (filter_fn
and filter_free_fn as out parameters, and filter_data as the function's
return value); they can just initialize the "struct filter" passed in.

Helped-by: Jeff Hostetler <git@jeffhostetler.com>
Helped-by: Jonathan Tan <jonathantanmy@google.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Matthew DeVore <matvore@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 22 insertions, 33 deletions

diff --git a/list-objects.c b/list-objects.c
index b5651ddd5b..9307d91fb3 100644
--- a/list-objects.c
+++ b/list-objects.c
@@ -18,8 +18,7 @@ struct traversal_context {
 	show_object_fn show_object;
 	show_commit_fn show_commit;
 	void *show_data;
-	filter_object_fn filter_fn;
-	void *filter_data;
+	struct filter *filter;
 };
 
 static void process_blob(struct traversal_context *ctx,
@@ -29,7 +28,7 @@ static void process_blob(struct traversal_context *ctx,
 {
 	struct object *obj = &blob->object;
 	size_t pathlen;
-	enum list_objects_filter_result r = LOFR_MARK_SEEN | LOFR_DO_SHOW;
+	enum list_objects_filter_result r;
 
 	if (!ctx->revs->blob_objects)
 		return;
@@ -54,11 +53,10 @@ static void process_blob(struct traversal_context *ctx,
 
 	pathlen = path->len;
 	strbuf_addstr(path, name);
-	if ((obj->flags & NOT_USER_GIVEN) && ctx->filter_fn)
-		r = ctx->filter_fn(ctx->revs->repo,
-				   LOFS_BLOB, obj,
-				   path->buf, &path->buf[pathlen],
-				   ctx->filter_data);
+	r = list_objects_filter__filter_object(ctx->revs->repo,
+					       LOFS_BLOB, obj,
+					       path->buf, &path->buf[pathlen],
+					       ctx->filter);
 	if (r & LOFR_MARK_SEEN)
 		obj->flags |= SEEN;
 	if (r & LOFR_DO_SHOW)
@@ -157,7 +155,7 @@ static void process_tree(struct traversal_context *ctx,
 	struct object *obj = &tree->object;
 	struct rev_info *revs = ctx->revs;
 	int baselen = base->len;
-	enum list_objects_filter_result r = LOFR_MARK_SEEN | LOFR_DO_SHOW;
+	enum list_objects_filter_result r;
 	int failed_parse;
 
 	if (!revs->tree_objects)
@@ -186,11 +184,10 @@ static void process_tree(struct traversal_context *ctx,
 	}
 
 	strbuf_addstr(base, name);
-	if ((obj->flags & NOT_USER_GIVEN) && ctx->filter_fn)
-		r = ctx->filter_fn(ctx->revs->repo,
-				   LOFS_BEGIN_TREE, obj,
-				   base->buf, &base->buf[baselen],
-				   ctx->filter_data);
+	r = list_objects_filter__filter_object(ctx->revs->repo,
+					       LOFS_BEGIN_TREE, obj,
+					       base->buf, &base->buf[baselen],
+					       ctx->filter);
 	if (r & LOFR_MARK_SEEN)
 		obj->flags |= SEEN;
 	if (r & LOFR_DO_SHOW)
@@ -203,16 +200,14 @@ static void process_tree(struct traversal_context *ctx,
 	else if (!failed_parse)
 		process_tree_contents(ctx, tree, base);
 
-	if ((obj->flags & NOT_USER_GIVEN) && ctx->filter_fn) {
-		r = ctx->filter_fn(ctx->revs->repo,
-				   LOFS_END_TREE, obj,
-				   base->buf, &base->buf[baselen],
-				   ctx->filter_data);
-		if (r & LOFR_MARK_SEEN)
-			obj->flags |= SEEN;
-		if (r & LOFR_DO_SHOW)
-			ctx->show_object(obj, base->buf, ctx->show_data);
-	}
+	r = list_objects_filter__filter_object(ctx->revs->repo,
+					       LOFS_END_TREE, obj,
+					       base->buf, &base->buf[baselen],
+					       ctx->filter);
+	if (r & LOFR_MARK_SEEN)
+		obj->flags |= SEEN;
+	if (r & LOFR_DO_SHOW)
+		ctx->show_object(obj, base->buf, ctx->show_data);
 
 	strbuf_setlen(base, baselen);
 	free_tree_buffer(tree);
@@ -402,8 +397,7 @@ void traverse_commit_list(struct rev_info *revs,
 	ctx.show_commit = show_commit;
 	ctx.show_object = show_object;
 	ctx.show_data = show_data;
-	ctx.filter_fn = NULL;
-	ctx.filter_data = NULL;
+	ctx.filter = NULL;
 	do_traverse(&ctx);
 }
 
@@ -416,17 +410,12 @@ void traverse_commit_list_filtered(
 	struct oidset *omitted)
 {
 	struct traversal_context ctx;
-	filter_free_fn filter_free_fn = NULL;
 
 	ctx.revs = revs;
 	ctx.show_object = show_object;
 	ctx.show_commit = show_commit;
 	ctx.show_data = show_data;
-	ctx.filter_fn = NULL;
-
-	ctx.filter_data = list_objects_filter__init(omitted, filter_options,
-						    &ctx.filter_fn, &filter_free_fn);
+	ctx.filter = list_objects_filter__init(omitted, filter_options);
 	do_traverse(&ctx);
-	if (ctx.filter_data && filter_free_fn)
-		filter_free_fn(ctx.filter_data);
+	list_objects_filter__free(ctx.filter);
 }