feat(api): implement nvim_{add,del}_user_command

Add support for adding and removing custom user commands with the Nvim
API.

1 files changed, 32 insertions, 0 deletions

diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index ba2238ace2..67fd5a4efc 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -4983,6 +4983,9 @@ static int ExpandFromContext(expand_T *xp, char_u *pat, int *num_file, char_u **
   if (xp->xp_context == EXPAND_USER_LIST) {
     return ExpandUserList(xp, num_file, file);
   }
+  if (xp->xp_context == EXPAND_USER_LUA) {
+    return ExpandUserLua(xp, num_file, file);
+  }
   if (xp->xp_context == EXPAND_PACKADD) {
     return ExpandPackAddDir(pat, num_file, file);
   }
@@ -5411,6 +5414,35 @@ static int ExpandUserList(expand_T *xp, int *num_file, char_u ***file)
   return OK;
 }
 
+static int ExpandUserLua(expand_T *xp, int *num_file, char_u ***file)
+{
+  typval_T rettv;
+  nlua_call_user_expand_func(xp, &rettv);
+  if (rettv.v_type != VAR_LIST) {
+    tv_clear(&rettv);
+    return FAIL;
+  }
+
+  list_T *const retlist = rettv.vval.v_list;
+
+  garray_T ga;
+  ga_init(&ga, (int)sizeof(char *), 3);
+  // Loop over the items in the list.
+  TV_LIST_ITER_CONST(retlist, li, {
+    if (TV_LIST_ITEM_TV(li)->v_type != VAR_STRING
+        || TV_LIST_ITEM_TV(li)->vval.v_string == NULL) {
+      continue;  // Skip non-string items and empty strings.
+    }
+
+    GA_APPEND(char *, &ga, xstrdup((const char *)TV_LIST_ITEM_TV(li)->vval.v_string));
+  });
+  tv_list_unref(retlist);
+
+  *file = ga.ga_data;
+  *num_file = ga.ga_len;
+  return OK;
+}
+
 /// Expand color scheme, compiler or filetype names.
 /// Search from 'runtimepath':
 ///   'runtimepath'/{dirnames}/{pat}.vim