api: unify buffer numbers and window ids with handles

also allow handle==0 meaning curbuf/curwin/curtab

src/nvim/api/private/defs.h

@@ -9,13 +9,15 @@
 #define STRING_INIT {.data = NULL, .size = 0}
 #define OBJECT_INIT { .type = kObjectTypeNil }
 #define ERROR_INIT { .set = false }
-#define REMOTE_TYPE(type) typedef uint64_t type
+#define REMOTE_TYPE(type) typedef handle_T type
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # define ArrayOf(...) Array
 # define DictionaryOf(...) Dictionary
 #endif
 
+typedef int handle_T;
+
 // Basic types
 typedef enum {
   kErrorTypeException,

src/nvim/api/private/handle.c

@@ -5,30 +5,26 @@
 #include "nvim/map.h"
 #include "nvim/api/private/handle.h"
 
-#define HANDLE_INIT(name) name##_handles = pmap_new(uint64_t)()
+#define HANDLE_INIT(name) name##_handles = pmap_new(handle_T)()
 
 #define HANDLE_IMPL(type, name) \
-  static PMap(uint64_t) *name##_handles = NULL; \
+  static PMap(handle_T) *name##_handles = NULL; /* NOLINT */ \
   \
-  type *handle_get_##name(uint64_t handle) \
+  type *handle_get_##name(handle_T handle) \
   { \
-    return pmap_get(uint64_t)(name##_handles, handle); \
+    return pmap_get(handle_T)(name##_handles, handle); \
   } \
   \
   void handle_register_##name(type *name) \
   { \
-    assert(!name->handle); \
-    name->handle = next_handle++; \
-    pmap_put(uint64_t)(name##_handles, name->handle, name); \
+    pmap_put(handle_T)(name##_handles, name->handle, name); \
   } \
   \
   void handle_unregister_##name(type *name) \
   { \
-    pmap_del(uint64_t)(name##_handles, name->handle); \
+    pmap_del(handle_T)(name##_handles, name->handle); \
   }
 
-static uint64_t next_handle = 1;
-
 HANDLE_IMPL(buf_T, buffer)
 HANDLE_IMPL(win_T, window)
 HANDLE_IMPL(tabpage_T, tabpage)

src/nvim/api/private/handle.h

@@ -3,9 +3,10 @@
 
 #include "nvim/vim.h"
 #include "nvim/buffer_defs.h"
+#include "nvim/api/private/defs.h"
 
 #define HANDLE_DECLS(type, name) \
-  type *handle_get_##name(uint64_t handle); \
+  type *handle_get_##name(handle_T handle); \
   void handle_register_##name(type *name); \
   void handle_unregister_##name(type *name);
 

src/nvim/api/private/helpers.c

@@ -507,6 +507,10 @@ Object vim_to_object(typval_T *obj)
 
 buf_T *find_buffer_by_handle(Buffer buffer, Error *err)
 {
+  if (buffer == 0) {
+    return curbuf;
+  }
+
   buf_T *rv = handle_get_buffer(buffer);
 
   if (!rv) {
@@ -518,6 +522,10 @@ buf_T *find_buffer_by_handle(Buffer buffer, Error *err)
 
 win_T * find_window_by_handle(Window window, Error *err)
 {
+  if (window == 0) {
+    return curwin;
+  }
+
   win_T *rv = handle_get_window(window);
 
   if (!rv) {
@@ -529,6 +537,10 @@ win_T * find_window_by_handle(Window window, Error *err)
 
 tabpage_T * find_tab_by_handle(Tabpage tabpage, Error *err)
 {
+  if (tabpage == 0) {
+    return curtab;
+  }
+
   tabpage_T *rv = handle_get_tabpage(tabpage);
 
   if (!rv) {

src/nvim/api/vim.c

@@ -472,7 +472,7 @@ void vim_set_current_buffer(Buffer buffer, Error *err)
   if (!try_end(err) && result == FAIL) {
     api_set_error(err,
                   Exception,
-                  _("Failed to switch to buffer %" PRIu64),
+                  _("Failed to switch to buffer %d"),
                   buffer);
   }
 }
@@ -522,7 +522,7 @@ void vim_set_current_window(Window window, Error *err)
   if (!try_end(err) && win != curwin) {
     api_set_error(err,
                   Exception,
-                  _("Failed to switch to window %" PRIu64),
+                  _("Failed to switch to window %d"),
                   window);
   }
 }
@@ -573,7 +573,7 @@ void vim_set_current_tabpage(Tabpage tabpage, Error *err)
   if (!try_end(err) && tp != curtab) {
     api_set_error(err,
                   Exception,
-                  _("Failed to switch to tabpage %" PRIu64),
+                  _("Failed to switch to tabpage %d"),
                   tabpage);
   }
 }