ref-filter.h: move contains caches into filter

Move the 'contains_cache' and 'no_contains_cache' used in filter_refs into
an 'internal' struct of the 'struct ref_filter'. In later patches, the
'struct ref_filter *' will be a common data structure across multiple
filtering functions. These caches are part of the common functionality the
filter struct will support, so they are updated to be internally accessible
wherever the filter is used.

The design used here mirrors what was introduced in 576de3d
(unpack_trees: start splitting internal fields from public API, 2023-02-27)
for 'unpack_trees_options'.

Signed-off-by: Victoria Dye <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: vdye

ref-filter.c

@@ -2680,8 +2680,6 @@ static int filter_ref_kind(struct ref_filter *filter, const char *refname)
 struct ref_filter_cbdata {
 	struct ref_array *array;
 	struct ref_filter *filter;
-	struct contains_cache contains_cache;
-	struct contains_cache no_contains_cache;
 };
 
 /*
@@ -2732,11 +2730,11 @@ static int ref_filter_handler(const char *refname, const struct object_id *oid,
 			return 0;
 		/* We perform the filtering for the '--contains' option... */
 		if (filter->with_commit &&
-		    !commit_contains(filter, commit, filter->with_commit, &ref_cbdata->contains_cache))
+		    !commit_contains(filter, commit, filter->with_commit, &filter->internal.contains_cache))
 			return 0;
 		/* ...or for the `--no-contains' option */
 		if (filter->no_commit &&
-		    commit_contains(filter, commit, filter->no_commit, &ref_cbdata->no_contains_cache))
+		    commit_contains(filter, commit, filter->no_commit, &filter->internal.no_contains_cache))
 			return 0;
 	}
 
@@ -2905,8 +2903,8 @@ int filter_refs(struct ref_array *array, struct ref_filter *filter, unsigned int
 	save_commit_buffer_orig = save_commit_buffer;
 	save_commit_buffer = 0;
 
-	init_contains_cache(&ref_cbdata.contains_cache);
-	init_contains_cache(&ref_cbdata.no_contains_cache);
+	init_contains_cache(&filter->internal.contains_cache);
+	init_contains_cache(&filter->internal.no_contains_cache);
 
 	/*  Simple per-ref filtering */
 	if (!filter->kind)
@@ -2930,8 +2928,8 @@ int filter_refs(struct ref_array *array, struct ref_filter *filter, unsigned int
 			head_ref(ref_filter_handler, &ref_cbdata);
 	}
 
-	clear_contains_cache(&ref_cbdata.contains_cache);
-	clear_contains_cache(&ref_cbdata.no_contains_cache);
+	clear_contains_cache(&filter->internal.contains_cache);
+	clear_contains_cache(&filter->internal.no_contains_cache);
 
 	/*  Filters that need revision walking */
 	reach_filter(array, &filter->reachable_from, INCLUDE_REACHED);

ref-filter.h

@@ -7,6 +7,7 @@
 #include "commit.h"
 #include "string-list.h"
 #include "strvec.h"
+#include "commit-reach.h"
 
 /* Quoting styles */
 #define QUOTE_NONE 0
@@ -75,6 +76,11 @@ struct ref_filter {
 		lines;
 	int abbrev,
 		verbose;
+
+	struct {
+		struct contains_cache contains_cache;
+		struct contains_cache no_contains_cache;
+	} internal;
 };
 
 struct ref_format {