3 files changed, 43 insertions, 0 deletions
diff --git a/lua/clever_f/capabilities.lua b/lua/clever_f/capabilities.lua
index 7478fb2..79013b5 100644
--- a/lua/clever_f/capabilities.lua
+++ b/lua/clever_f/capabilities.lua
@@ -2,6 +2,7 @@ local M = {}
 
 M.read_methods = {
   text = { "read_text" },
+  buffer = { "read_buffer" },
   cursor = { "read_cursor" },
   mode = { "read_mode", "read_pending_operator" },
   selection = { "read_selection" },
diff --git a/lua/clever_f/feedback_service.lua b/lua/clever_f/feedback_service.lua
index 39ae527..492eda6 100644
--- a/lua/clever_f/feedback_service.lua
+++ b/lua/clever_f/feedback_service.lua
@@ -15,6 +15,11 @@ M.Priority = {
   HIGH = "high",
   ORDINARY = "ordinary",
 }
+M.FINALIZER_EVENTS = {
+  "CursorMoved",
+  "InsertEnter",
+  "TextChanged",
+}
 
 local OVERLAY_PRIORITIES = {
   CleverFCursor = M.Priority.HIGH,
@@ -95,6 +100,8 @@ local function require_host(host)
     or type(host.define_highlight_group) ~= "function"
     or type(host.create_highlight) ~= "function"
     or type(host.remove_highlight) ~= "function"
+    or type(host.read_buffer) ~= "function"
+    or type(host.register_events) ~= "function"
     or type(host.supports_cursor_presentation) ~= "function"
     or type(host.suppress_cursor_presentation) ~= "function"
     or type(host.restore_cursor_presentation) ~= "function"
@@ -111,6 +118,7 @@ local function require_transitions(transitions, state)
     or type(transitions.RemoveTemporaryOverlay) ~= "function"
     or type(transitions.AddTargetOverlay) ~= "function"
     or type(transitions.ClearTargetOverlays) ~= "function"
+    or type(transitions.AddFinalizer) ~= "function"
   then
     fail("FeedbackService transitions must manage overlay resources", 3)
   end
@@ -447,6 +455,26 @@ function FeedbackService:remove_character_overlays(window)
   return remove_target_overlays(service_records[self], window)
 end
 
+function FeedbackService:handle_finalizer_event()
+  return false
+end
+
+local function register_finalizers(service, record)
+  local buffer = record.host:read_buffer()
+  local identity = record.host:register_events(
+    M.FINALIZER_EVENTS,
+    function(name, payload)
+      service:handle_finalizer_event(name, payload)
+    end,
+    { buffer = buffer }
+  )
+  record.transitions:AddFinalizer(identity, buffer)
+  return {
+    identity = identity,
+    buffer = buffer,
+  }
+end
+
 function FeedbackService:request_persistent(specification)
   local request = self:build_persistent(specification)
   if request.window == nil then
@@ -471,6 +499,7 @@ function FeedbackService:request_persistent(specification)
     request.window,
     request.anchor.line
   )
+  request.finalizers = register_finalizers(self, record)
   local requests = record.persistent_requests
   requests[#requests + 1] = request
   return request
diff --git a/lua/clever_f/testing/memory_host.lua b/lua/clever_f/testing/memory_host.lua
index b815c2f..8d92697 100644
--- a/lua/clever_f/testing/memory_host.lua
+++ b/lua/clever_f/testing/memory_host.lua
@@ -138,6 +138,7 @@ function MemoryHost.new(options)
 
   local self = setmetatable({
     _text = text_snapshot(options.text or options.buffer_lines or { "" }),
+    _buffer = options.buffer or "buffer-1",
     _cursor = domain.Position.coerce(options.cursor or { line = 1, byte_column = 1 }),
     _window = options.window or "window-1",
     _mode = raw_mode,
@@ -229,6 +230,11 @@ function MemoryHost:read_cursor()
   return self._cursor
 end
 
+function MemoryHost:read_buffer()
+  self:_record("read_buffer", { buffer = self._buffer })
+  return self._buffer
+end
+
 function MemoryHost:read_window()
   self:_record("read_window", { window = self._window })
   return self._window
@@ -322,6 +328,13 @@ function MemoryHost:set_cursor(position)
   self._cursor = domain.Position.coerce(position)
 end
 
+function MemoryHost:set_buffer(buffer)
+  if buffer == nil then
+    error("buffer identity must be present", 2)
+  end
+  self._buffer = buffer
+end
+
 function MemoryHost:set_window(window)
   if window == nil then
     error("window identity must be present", 2)