3 files changed, 36 insertions, 6 deletions
diff --git a/runtime/lua/vim/treesitter.lua b/runtime/lua/vim/treesitter.lua
index 38ac182e32..3af66b134c 100644
--- a/runtime/lua/vim/treesitter.lua
+++ b/runtime/lua/vim/treesitter.lua
@@ -44,13 +44,18 @@ function M._create_parser(bufnr, lang, opts)
     self:_on_bytes(...)
   end
 
-  local function detach_cb()
+  local function detach_cb(_, ...)
     if parsers[bufnr] == self then
       parsers[bufnr] = nil
     end
+    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()
 
diff --git a/runtime/lua/vim/treesitter/highlighter.lua b/runtime/lua/vim/treesitter/highlighter.lua
index 275e960e28..6b833c6d35 100644
--- a/runtime/lua/vim/treesitter/highlighter.lua
+++ b/runtime/lua/vim/treesitter/highlighter.lua
@@ -113,8 +113,9 @@ function TSHighlighter.new(tree, opts)
   opts = opts or {}
   self.tree = tree
   tree:register_cbs {
-    on_changedtree = function(...) self:on_changedtree(...) end,
-    on_bytes = function(...) self:on_bytes(...) end
+    on_changedtree = function(...) self:on_changedtree(...) end;
+    on_bytes = function(...) self:on_bytes(...) end;
+    on_detach = function(...) self:on_detach(...) end;
   }
 
   self.bufnr = tree:source()
@@ -176,6 +177,10 @@ function TSHighlighter:on_bytes(_, _, start_row, _, _, _, _, _, new_end)
   a.nvim__buf_redraw_range(self.bufnr, start_row, start_row + new_end + 1)
 end
 
+function TSHighlighter:on_detach()
+  self:destroy()
+end
+
 function TSHighlighter:on_changedtree(changes)
   for _, ch in ipairs(changes or {}) do
     a.nvim__buf_redraw_range(self.bufnr, ch[1], ch[3]+1)
diff --git a/runtime/lua/vim/treesitter/languagetree.lua b/runtime/lua/vim/treesitter/languagetree.lua
index 6d47ed8365..28a87f26c7 100644
--- a/runtime/lua/vim/treesitter/languagetree.lua
+++ b/runtime/lua/vim/treesitter/languagetree.lua
@@ -35,6 +35,7 @@ function LanguageTree.new(source, lang, opts)
     _callbacks = {
       changedtree = {},
       bytes = {},
+      detach = {},
       child_added = {},
       child_removed = {}
     },
@@ -45,11 +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
 
@@ -397,6 +403,16 @@ 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(true)
+  self:_do_callback('detach', ...)
+end
+
 --- Registers callbacks for the parser
 -- @param cbs An `nvim_buf_attach`-like table argument with the following keys :
 --  `on_bytes` : see `nvim_buf_attach`, but this will be called _after_ the parsers callback.
@@ -416,6 +432,10 @@ function LanguageTree:register_cbs(cbs)
     table.insert(self._callbacks.bytes, cbs.on_bytes)
   end
 
+  if cbs.on_detach then
+    table.insert(self._callbacks.detach, cbs.on_detach)
+  end
+
   if cbs.on_child_added then
     table.insert(self._callbacks.child_added, cbs.on_child_added)
   end