buffer updates: add on_reload callback and handle it in treesitter parser

runtime/lua/vim/treesitter.lua

@@ -51,7 +51,11 @@ function M._create_parser(bufnr, lang, opts)
     self:_on_detach(...)
   end
 
-  a.nvim_buf_attach(self:source(), false, {on_bytes=bytes_cb, on_detach=detach_cb, preview=true})
+  local function reload_cb(_, ...)
+    self:_on_reload(...)
+  end
+
+  a.nvim_buf_attach(self:source(), false, {on_bytes=bytes_cb, on_detach=detach_cb, on_reload=reload_cb, preview=true})
 
   self:parse()
 

runtime/lua/vim/treesitter/languagetree.lua

@@ -46,11 +46,16 @@ function LanguageTree.new(source, lang, opts)
 end
 
 -- Invalidates this parser and all its children
-function LanguageTree:invalidate()
+function LanguageTree:invalidate(reload)
   self._valid = false
 
+  -- buffer was reloaded, reparse all trees
+  if reload then
+    self._trees = {}
+  end
+
   for _, child in ipairs(self._children) do
-    child:invalidate()
+    child:invalidate(reload)
   end
 end
 
@@ -398,8 +403,13 @@ function LanguageTree:_on_bytes(bufnr, changed_tick,
       new_row, new_col, new_byte)
 end
 
+function LanguageTree:_on_reload()
+  self:invalidate(true)
+end
+
+
 function LanguageTree:_on_detach(...)
-  self:invalidate()
+  self:invalidate(true)
   self:_do_callback('detach', ...)
 end