fix(autocmds): completely clear highlights and autocmds on disable

This involves handling all the "rendering" logic inside `autocmds`
module and only exposing two functions (`start_rendering` and
`stop_rendering`) for the main module.

Fix #5

lua/sentiment.lua

@@ -1,6 +1,5 @@
 local manager = require("sentiment.config.manager")
 local autocmds = require("sentiment.autocmds")
-local ui = require("sentiment.ui")
 
 local M = {}
 
@@ -24,28 +23,14 @@ function M.setup(cfg)
   vim.g.loaded_matchparen = 1
   manager.apply(cfg or {})
 
-  autocmds.renderer:create()
+  autocmds.start_rendering()
   create_user_commands()
 end
 
 ---Disable the plugin.
-function M.disable()
-  if not autocmds.renderer:exists() then return end
-
-  autocmds.renderer:remove()
-  for _, buf in ipairs(vim.api.nvim_list_bufs()) do
-    ui.clear(buf)
-  end
-end
+function M.disable() autocmds.stop_rendering() end
 
 ---Re-enable the plugin.
-function M.enable()
-  if autocmds.renderer:exists() then return end
-
-  for _, win in ipairs(vim.api.nvim_list_wins()) do
-    ui.render(win)
-  end
-  autocmds.renderer:create()
-end
+function M.enable() autocmds.start_rendering() end
 
 return M

lua/sentiment/autocmds.lua

@@ -3,8 +3,9 @@ local ui = require("sentiment.ui")
 
 local M = {}
 
----`Pair` renderer.
-M.renderer = Autocmd.new({
+local renderer_timer = nil
+
+local renderer = Autocmd.new({
   name = "renderer",
   desc = "Render pair",
   events = {
@@ -14,7 +15,32 @@ M.renderer = Autocmd.new({
     "CursorMoved",
     "CursorMovedI",
   },
-  callback = function() ui.render() end,
+  callback = function() renderer_timer = ui.render() end,
 })
 
+---Start rendering pairs.
+function M.start_rendering()
+  if renderer:exists() then return end
+
+  for _, win in ipairs(vim.api.nvim_list_wins()) do
+    renderer_timer = ui.render(win)
+  end
+
+  renderer:create()
+end
+
+---Stop rendering pairs.
+function M.stop_rendering()
+  if not renderer:exists() then return end
+
+  renderer:remove()
+  if renderer_timer ~= nil and renderer_timer:is_active() then
+    renderer_timer:close()
+  end
+
+  for _, buf in ipairs(vim.api.nvim_list_bufs()) do
+    ui.clear(buf)
+  end
+end
+
 return M