ui: use line-based rather than char-based updates in screen.c

Add ext_newgrid and ext_hlstate extensions. These use predefined
highlights and line-segment based updates, for efficiency and
simplicity.. The ext_hlstate extension in addition allows semantic
identification of builtin and syntax highlights.

Reimplement the old char-based updates in the remote UI layer, for
compatibility. For the moment, this is still the default. The bulitin
TUI uses the new line-based protocol.

cmdline uses curwin cursor position when ext_cmdline is active.

1 files changed, 18 insertions, 1 deletions

diff --git a/src/nvim/highlight.c b/src/nvim/highlight.c
index 5efbafa128..0b39ba442e 100644
--- a/src/nvim/highlight.c
+++ b/src/nvim/highlight.c
@@ -38,7 +38,7 @@ void highlight_init(void)
 bool highlight_use_hlstate(void)
 {
   if (hlstate_active) {
-      return false;
+    return false;
   }
   hlstate_active = true;
   // hl tables must now be rebuilt.
@@ -89,9 +89,26 @@ static int get_attr_entry(HlEntry entry)
 
   map_put(HlEntry, int)(attr_entry_ids, entry, id);
 
+  Array inspect = hl_inspect(id);
+
+  // Note: internally we don't distinguish between cterm and rgb attributes,
+  // remote_ui_hl_attr_define will however.
+  ui_call_hl_attr_define(id, entry.attr, entry.attr, inspect);
+  api_free_array(inspect);
   return id;
 }
 
+/// When a UI connects, we need to send it the table of higlights used so far.
+void ui_send_all_hls(UI *ui)
+{
+  for (size_t i = 1; i < kv_size(attr_entries); i++) {
+    Array inspect = hl_inspect((int)i);
+    ui->hl_attr_define(ui, (Integer)i, kv_A(attr_entries, i).attr,
+                       kv_A(attr_entries, i).attr, inspect);
+    api_free_array(inspect);
+  }
+}
+
 /// Get attribute code for a syntax group.
 int hl_get_syn_attr(int idx, HlAttrs at_en)
 {