cocci & cache.h: apply variable section of "pending" index-compatibility

Mostly apply the part of "index-compatibility.pending.cocci" that
renames the global variables like "active_nr", which are a shorthand
to referencing (in that case) a struct member as "the_index.cache_nr".

In doing so move more of "index-compatibility.pending.cocci" to
"index-compatibility.cocci".

In the case of "active_nr" we'd have a textual conflict with
"ab/various-leak-fixes" in "next"[1]. Let's exclude that specific case
while moving the rule over from "pending".

1. 407b94280f8 (commit: discard partial cache before (re-)reading it,
   2022-11-08)

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/builtin/merge-index.c b/builtin/merge-index.c
index 012f52bd00..a334c513c9 100644
--- a/builtin/merge-index.c
+++ b/builtin/merge-index.c
@@ -14,11 +14,11 @@ static int merge_entry(int pos, const char *path)
 	char ownbuf[4][60];
 	struct child_process cmd = CHILD_PROCESS_INIT;
 
-	if (pos >= active_nr)
+	if (pos >= the_index.cache_nr)
 		die("git merge-index: %s not in the cache", path);
 	found = 0;
 	do {
-		const struct cache_entry *ce = active_cache[pos];
+		const struct cache_entry *ce = the_index.cache[pos];
 		int stage = ce_stage(ce);
 
 		if (strcmp(ce->name, path))
@@ -28,7 +28,7 @@ static int merge_entry(int pos, const char *path)
 		xsnprintf(ownbuf[stage], sizeof(ownbuf[stage]), "%o", ce->ce_mode);
 		arguments[stage] = hexbuf[stage];
 		arguments[stage + 4] = ownbuf[stage];
-	} while (++pos < active_nr);
+	} while (++pos < the_index.cache_nr);
 	if (!found)
 		die("git merge-index: %s not in the cache", path);
 
@@ -62,8 +62,8 @@ static void merge_all(void)
 	int i;
 	/* TODO: audit for interaction with sparse-index. */
 	ensure_full_index(&the_index);
-	for (i = 0; i < active_nr; i++) {
-		const struct cache_entry *ce = active_cache[i];
+	for (i = 0; i < the_index.cache_nr; i++) {
+		const struct cache_entry *ce = the_index.cache[i];
 		if (!ce_stage(ce))
 			continue;
 		i += merge_entry(i, ce->name)-1;