[PATCH v12 3/4] ref-filter: factor ref_array pushing into its own function

[Harald Nordgren]

From: Jeff King <p...@peff.net>

In preparation for callers constructing their own ref_array
structs, let's move our own internal push operation into its
own function.

While we're at it, we can replace REALLOC_ARRAY() with
ALLOC_GROW(), which should give the growth operation
amortized linear complexity (as opposed to growing by one,
which is potentially quadratic, though in-place realloc
growth often makes this faster in practice).

Signed-off-by: Jeff King <p...@peff.net>
Signed-off-by: Harald Nordgren <haraldnordg...@gmail.com>
---
 ref-filter.c | 16 +++++++++++++---
 ref-filter.h |  8 ++++++++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/ref-filter.c b/ref-filter.c
index c1c3cc948..6e9328b27 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1840,6 +1840,18 @@ static struct ref_array_item *new_ref_array_item(const 
char *refname,
        return ref;
 }
 
+struct ref_array_item *ref_array_push(struct ref_array *array,
+                                     const char *refname,
+                                     const struct object_id *oid)
+{
+       struct ref_array_item *ref = new_ref_array_item(refname, oid);
+
+       ALLOC_GROW(array->items, array->nr + 1, array->alloc);
+       array->items[array->nr++] = ref;
+
+       return ref;
+}
+
 static int ref_kind_from_refname(const char *refname)
 {
        unsigned int i;
@@ -1930,13 +1942,11 @@ static int ref_filter_handler(const char *refname, 
const struct object_id *oid,
         * to do its job and the resulting list may yet to be pruned
         * by maxcount logic.
         */
-       ref = new_ref_array_item(refname, oid);
+       ref = ref_array_push(ref_cbdata->array, refname, oid);
        ref->commit = commit;
        ref->flag = flag;
        ref->kind = kind;
 
-       REALLOC_ARRAY(ref_cbdata->array->items, ref_cbdata->array->nr + 1);
-       ref_cbdata->array->items[ref_cbdata->array->nr++] = ref;
        return 0;
 }
 
diff --git a/ref-filter.h b/ref-filter.h
index 68268f9eb..76cf87cb6 100644
--- a/ref-filter.h
+++ b/ref-filter.h
@@ -135,4 +135,12 @@ void setup_ref_filter_porcelain_msg(void);
 void pretty_print_ref(const char *name, const struct object_id *oid,
                      const struct ref_format *format);
 
+/*
+ * Push a single ref onto the array; this can be used to construct your own
+ * ref_array without using filter_refs().
+ */
+struct ref_array_item *ref_array_push(struct ref_array *array,
+                                     const char *refname,
+                                     const struct object_id *oid);
+
 #endif /*  REF_FILTER_H  */
-- 
2.14.3 (Apple Git-98)