API: nvim__stats()

Use it to verify fsync() behavior.

src/nvim/api/vim.c

@@ -1473,6 +1473,17 @@ Float nvim__id_float(Float flt)
   return flt;
 }
 
+/// Gets internal stats.
+///
+/// @return Map of various internal stats.
+Dictionary nvim__stats(void)
+{
+  Dictionary rv = ARRAY_DICT_INIT;
+  PUT(rv, "fsync", INTEGER_OBJ(g_stats.fsync));
+  PUT(rv, "redraw", INTEGER_OBJ(g_stats.redraw));
+  return rv;
+}
+
 /// Gets a list of dictionaries representing attached UIs.
 ///
 /// @return Array of UI dictionaries

src/nvim/globals.h

@@ -80,6 +80,11 @@ typedef enum {
   kTrue  = 1,
 } TriState;
 
+EXTERN struct nvim_stats_s {
+  int64_t fsync;
+  int64_t redraw;
+} g_stats INIT(= { 0, 0 });
+
 /* Values for "starting" */
 #define NO_SCREEN       2       /* no screen updating yet */
 #define NO_BUFFERS      1       /* not all buffers loaded yet */

src/nvim/os/fs.c

@@ -629,6 +629,7 @@ int os_fsync(int fd)
 {
   int r;
   RUN_UV_FS_FUNC(r, uv_fs_fsync, fd, NULL);
+  g_stats.fsync++;
   return r;
 }