From a6c80d13c01cd3426174592d5fd5d885e8a1e79b Mon Sep 17 00:00:00 2001
From: Lukas Reineke <lukas.reineke@protonmail.com>
Date: Sun, 10 Sep 2023 10:32:57 +0900
Subject: [PATCH] Better debounce logic

fix #624
---
 doc/indent_blankline.txt |  2 +-
 lua/ibl/autocmds.lua     | 10 ++--------
 lua/ibl/config.lua       |  2 +-
 lua/ibl/init.lua         | 28 +++++++++++++++++-----------
 4 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/doc/indent_blankline.txt b/doc/indent_blankline.txt
index 2f4c3a92..97948a52 100644
--- a/doc/indent_blankline.txt
+++ b/doc/indent_blankline.txt
@@ -185,7 +185,7 @@ config                                                            *ibl.config*
                         Sets the amount indent-blankline debounces
                         refreshes in milliseconds
 
-                        Default: `50` ~
+                        Default: `200` ~
 
    • {viewport_buffer}  (|ibl.config.viewport_buffer|)
                         Configures the viewport of where indentation guides
diff --git a/lua/ibl/autocmds.lua b/lua/ibl/autocmds.lua
index 1accee7d..91c6950d 100644
--- a/lua/ibl/autocmds.lua
+++ b/lua/ibl/autocmds.lua
@@ -12,6 +12,7 @@ M.setup = function()
         callback = ibl.refresh_all,
     })
     vim.api.nvim_create_autocmd({
+        "CursorMoved",
         "BufWinEnter",
         "CompleteChanged",
         "FileChangedShellPost",
@@ -22,19 +23,12 @@ M.setup = function()
         group = group,
         pattern = "*",
         callback = function(opts)
-            ibl.refresh(opts.buf)
+            ibl.debounced_refresh(opts.buf)
         end,
     })
     vim.api.nvim_create_autocmd("OptionSet", {
         group = group,
         pattern = "list,listchars,shiftwidth,tabstop,vartabstop",
-        callback = function(opts)
-            ibl.refresh(opts.buf)
-        end,
-    })
-    vim.api.nvim_create_autocmd("CursorMoved", {
-        group = group,
-        pattern = "*",
         callback = function(opts)
             ibl.debounced_refresh(opts.buf)
         end,
diff --git a/lua/ibl/config.lua b/lua/ibl/config.lua
index 056a2231..8c5f654c 100644
--- a/lua/ibl/config.lua
+++ b/lua/ibl/config.lua
@@ -18,7 +18,7 @@ M.buffer_config = {}
 ---@type ibl.config.full
 M.default_config = {
     enabled = true,
-    debounce = 50,
+    debounce = 200,
     viewport_buffer = {
         min = 30,
         max = 500,
diff --git a/lua/ibl/init.lua b/lua/ibl/init.lua
index 8888a7d0..f47e19de 100644
--- a/lua/ibl/init.lua
+++ b/lua/ibl/init.lua
@@ -110,22 +110,28 @@ end
 
 local debounced_refresh = setmetatable({
     timers = {},
+    queued_buffers = {},
 }, {
     ---@param bufnr number
     __call = function(self, bufnr)
         bufnr = utils.get_bufnr(bufnr)
-        local config = conf.get_config(bufnr)
-        if not self.timers[bufnr] or self.timers[bufnr]:is_closing() then
-            if vim.uv then
-                self.timers[bufnr] = vim.uv.new_timer()
-            else
-                self.timers[bufnr] = vim.loop.new_timer()
-            end
+        local uv = vim.uv or vim.loop
+        if not self.timers[bufnr] then
+            self.timers[bufnr] = uv.new_timer()
+        end
+        if uv.timer_get_due_in(self.timers[bufnr]) <= 50 then
+            M.refresh(bufnr)
+
+            local config = conf.get_config(bufnr)
+            self.timers[bufnr]:start(config.debounce, 0, function()
+                if self.queued_buffers[bufnr] then
+                    self.queued_buffers[bufnr] = nil
+                    vim.schedule_wrap(M.refresh)(bufnr)
+                end
+            end)
+        else
+            self.queued_buffers[bufnr] = true
         end
-        self.timers[bufnr]:start(config.debounce, 0, function()
-            vim.schedule_wrap(M.refresh)(bufnr)
-            self.timers[bufnr]:stop()
-        end)
     end,
 })