cocci & cache.h: apply pending "index_cache_pos" rule

Apply the rule added in [1] to change "cache_name_pos" to
"index_name_pos", which allows us to get rid of another
"USE_THE_INDEX_COMPATIBILITY_MACROS" macro.

The replacement of "USE_THE_INDEX_COMPATIBILITY_MACROS" here with
"USE_THE_INDEX_VARIABLE" is a manual change on top, now that these
files only use "&the_index", and don't need any compatibility
macros (or functions).

1. 0e6550a2c6 (cocci: add a index-compatibility.pending.cocci,
   2022-11-19)

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

builtin/mv.c

@@ -3,7 +3,7 @@
  *
  * Copyright (C) 2006 Johannes Schindelin
  */
-#define USE_THE_INDEX_COMPATIBILITY_MACROS
+#define USE_THE_INDEX_VARIABLE
 #include "builtin.h"
 #include "config.h"
 #include "pathspec.h"
@@ -489,7 +489,8 @@ remove_entry:
 			if ((mode & SPARSE) &&
 			    path_in_sparse_checkout(dst, &the_index)) {
 				/* from out-of-cone to in-cone */
-				int dst_pos = cache_name_pos(dst, strlen(dst));
+				int dst_pos = index_name_pos(&the_index, dst,
+							     strlen(dst));
 				struct cache_entry *dst_ce = the_index.cache[dst_pos];
 
 				dst_ce->ce_flags &= ~CE_SKIP_WORKTREE;
@@ -500,7 +501,8 @@ remove_entry:
 				   !(mode & SPARSE) &&
 				   !path_in_sparse_checkout(dst, &the_index)) {
 				/* from in-cone to out-of-cone */
-				int dst_pos = cache_name_pos(dst, strlen(dst));
+				int dst_pos = index_name_pos(&the_index, dst,
+							     strlen(dst));
 				struct cache_entry *dst_ce = the_index.cache[dst_pos];
 
 				/*

builtin/update-index.c

@@ -3,7 +3,7 @@
  *
  * Copyright (C) Linus Torvalds, 2005
  */
-#define USE_THE_INDEX_COMPATIBILITY_MACROS
+#define USE_THE_INDEX_VARIABLE
 #include "cache.h"
 #include "bulk-checkin.h"
 #include "config.h"
@@ -381,7 +381,7 @@ static int process_path(const char *path, struct stat *st, int stat_errno)
 	if (has_symlink_leading_path(path, len))
 		return error("'%s' is beyond a symbolic link", path);
 
-	pos = cache_name_pos(path, len);
+	pos = index_name_pos(&the_index, path, len);
 	ce = pos < 0 ? NULL : the_index.cache[pos];
 	if (ce && ce_skip_worktree(ce)) {
 		/*

cache.h

@@ -456,7 +456,6 @@ extern struct index_state the_index;
 #ifdef USE_THE_INDEX_COMPATIBILITY_MACROS
 #define read_cache() repo_read_index(the_repository)
 #define discard_cache() discard_index(&the_index)
-#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 #endif
 #endif
 #endif

contrib/coccinelle/index-compatibility.cocci

@@ -91,6 +91,9 @@ identifier ACT = active_cache_tree;
 |
 - resolve_undo_clear
 + resolve_undo_clear_index
+|
+- cache_name_pos
++ index_name_pos
 )
   (
 + &the_index,

contrib/coccinelle/index-compatibility.pending.cocci

@@ -15,9 +15,6 @@
 (
 - discard_cache
 + discard_index
-|
-- cache_name_pos
-+ index_name_pos
 )
   (
 + &the_index,