Merge pull request #25039 from glepnir/fix_hl

fix(highlight): add create param in nvim_get_hl api function

src/nvim/api/keysets.h

@@ -181,6 +181,7 @@ typedef struct {
   Integer id;
   String name;
   Boolean link;
+  Boolean create;
 } Dict(get_highlight);
 
 typedef struct {

src/nvim/api/vim.c

@@ -96,6 +96,7 @@ Integer nvim_get_hl_id_by_name(String name)
 ///                 - name: (string) Get a highlight definition by name.
 ///                 - id: (integer) Get a highlight definition by id.
 ///                 - link: (boolean, default true) Show linked group name instead of effective definition |:hi-link|.
+///                 - create: (boolean, default true) When highlight group doesn't exist create it.
 ///
 /// @param[out] err Error details, if any.
 /// @return Highlight groups as a map from group name to a highlight definition map as in |nvim_set_hl()|,

src/nvim/highlight_group.c

@@ -1569,7 +1569,13 @@ Dictionary ns_get_hl_defs(NS ns_id, Dict(get_highlight) *opts, Arena *arena, Err
   Boolean link = GET_BOOL_OR_TRUE(opts, get_highlight, link);
   int id = -1;
   if (HAS_KEY(opts, get_highlight, name)) {
-    id = syn_check_group(opts->name.data, opts->name.size);
+    Boolean create = GET_BOOL_OR_TRUE(opts, get_highlight, create);
+    id = create ? syn_check_group(opts->name.data, opts->name.size)
+                : syn_name2id_len(opts->name.data, opts->name.size);
+    if (id == 0 && !create) {
+      Dictionary attrs = ARRAY_DICT_INIT;
+      return attrs;
+    }
   } else if (HAS_KEY(opts, get_highlight, id)) {
     id = (int)opts->id;
   }