Modules: Add remaining list API functions (#8439)

List functions operating on elements by index:

* RM_ListGet
* RM_ListSet
* RM_ListInsert
* RM_ListDelete

Iteration is done using a simple for loop over indices.
The index based functions use an internal iterator as an optimization.
This is explained in the docs:

```
 * Many of the list functions access elements by index. Since a list is in
 * essence a doubly-linked list, accessing elements by index is generally an
 * O(N) operation. However, if elements are accessed sequentially or with
 * indices close together, the functions are optimized to seek the index from
 * the previous index, rather than seeking from the ends of the list.
 *
 * This enables iteration to be done efficiently using a simple for loop:
 *
 *     long n = RM_ValueLength(key);
 *     for (long i = 0; i < n; i++) {
 *         RedisModuleString *elem = RedisModule_ListGet(key, i);
 *         // Do stuff...
 *     }
```

1 files changed, 9 insertions, 0 deletions

diff --git a/src/redismodule.h b/src/redismodule.h
index be2186bc4..dd491ef24 100644
--- a/src/redismodule.h
+++ b/src/redismodule.h
@@ -27,6 +27,7 @@
  * Avoid touching the LRU/LFU of the key when opened. */
 #define REDISMODULE_OPEN_KEY_NOTOUCH (1<<16)
 
+/* List push and pop */
 #define REDISMODULE_LIST_HEAD 0
 #define REDISMODULE_LIST_TAIL 1
 
@@ -615,6 +616,10 @@ REDISMODULE_API int (*RedisModule_KeyType)(RedisModuleKey *kp) REDISMODULE_ATTR;
 REDISMODULE_API size_t (*RedisModule_ValueLength)(RedisModuleKey *kp) REDISMODULE_ATTR;
 REDISMODULE_API int (*RedisModule_ListPush)(RedisModuleKey *kp, int where, RedisModuleString *ele) REDISMODULE_ATTR;
 REDISMODULE_API RedisModuleString * (*RedisModule_ListPop)(RedisModuleKey *key, int where) REDISMODULE_ATTR;
+REDISMODULE_API RedisModuleString * (*RedisModule_ListGet)(RedisModuleKey *key, long index) REDISMODULE_ATTR;
+REDISMODULE_API int (*RedisModule_ListSet)(RedisModuleKey *key, long index, RedisModuleString *value) REDISMODULE_ATTR;
+REDISMODULE_API int (*RedisModule_ListInsert)(RedisModuleKey *key, long index, RedisModuleString *value) REDISMODULE_ATTR;
+REDISMODULE_API int (*RedisModule_ListDelete)(RedisModuleKey *key, long index) REDISMODULE_ATTR;
 REDISMODULE_API RedisModuleCallReply * (*RedisModule_Call)(RedisModuleCtx *ctx, const char *cmdname, const char *fmt, ...) REDISMODULE_ATTR;
 REDISMODULE_API const char * (*RedisModule_CallReplyProto)(RedisModuleCallReply *reply, size_t *len) REDISMODULE_ATTR;
 REDISMODULE_API void (*RedisModule_FreeCallReply)(RedisModuleCallReply *reply) REDISMODULE_ATTR;
@@ -941,6 +946,10 @@ static int RedisModule_Init(RedisModuleCtx *ctx, const char *name, int ver, int
     REDISMODULE_GET_API(ValueLength);
     REDISMODULE_GET_API(ListPush);
     REDISMODULE_GET_API(ListPop);
+    REDISMODULE_GET_API(ListGet);
+    REDISMODULE_GET_API(ListSet);
+    REDISMODULE_GET_API(ListInsert);
+    REDISMODULE_GET_API(ListDelete);
     REDISMODULE_GET_API(StringToLongLong);
     REDISMODULE_GET_API(StringToDouble);
     REDISMODULE_GET_API(StringToLongDouble);