New event: DirChanged

src/nvim/auevents.lua

@@ -28,6 +28,7 @@ return {
     'CursorHoldI',            -- idem, in Insert mode
     'CursorMoved',            -- cursor was moved
     'CursorMovedI',           -- cursor was moved in Insert mode
+    'DirChanged',             -- directory changed
     'EncodingChanged',        -- after changing the 'encoding' option
     'FileAppendCmd',          -- append to a file using command
     'FileAppendPost',         -- after appending to a file
@@ -101,6 +102,7 @@ return {
   -- List of neovim-specific events or aliases for the purpose of generating 
   -- syntax file
   neovim_specific = {
+    DirChanged=true,
     TabClosed=true,
     TabNew=true,
     TabNewEntered=true,

src/nvim/ex_docmd.c

@@ -6949,6 +6949,35 @@ void free_cd_dir(void)
 
 #endif
 
+static void apply_autocmd_dirchanged(char_u *new_dir, CdScope scope)
+{
+  dict_T *dict = get_vim_var_dict(VV_EVENT);
+  char buf[8];
+
+  switch (scope) {
+  case kCdScopeGlobal:
+    snprintf(buf, sizeof(buf), "global");
+    break;
+  case kCdScopeTab:
+    snprintf(buf, sizeof(buf), "tab");
+    break;
+  case kCdScopeWindow:
+    snprintf(buf, sizeof(buf), "window");
+    break;
+  case kCdScopeInvalid:
+    // Should never happen.
+    assert(false);
+  }
+
+  dict_add_nr_str(dict, "scope", 0L, (char_u *)buf);
+  dict_add_nr_str(dict, "cwd",   0L, new_dir);
+  dict_set_keys_readonly(dict);
+
+  apply_autocmds(EVENT_DIRCHANGED, NULL, new_dir, false, NULL);
+
+  dict_clear(dict);
+}
+
 /// Deal with the side effects of changing the current directory.
 ///
 /// @param scope  Scope of the function call (global, tab or window).
@@ -6972,6 +7001,8 @@ void post_chdir(CdScope scope)
     }
   }
 
+  apply_autocmd_dirchanged(new_dir, scope);
+
   switch (scope) {
   case kCdScopeGlobal:
     // We are now in the global directory, no need to remember its name.
@@ -6998,8 +7029,6 @@ void post_chdir(CdScope scope)
   shorten_fnames(TRUE);
 }
 
-
-
 /// `:cd`, `:tcd`, `:lcd`, `:chdir`, `:tchdir` and `:lchdir`.
 void ex_cd(exarg_T *eap)
 {
@@ -7061,8 +7090,8 @@ void ex_cd(exarg_T *eap)
 
       post_chdir(scope);
 
-      /* Echo the new current directory if the command was typed. */
+      // Echo the new current directory if the command was typed.
-      if (KeyTyped || p_verbose >= 5)
+      if (KeyTyped || p_verbose >= 5) {
         ex_pwd(eap);
     }
     xfree(tofree);