From 1ea8611dbc31722a14ef25f52a5bfe402f8774b6 Mon Sep 17 00:00:00 2001
From: rootiest <chris@rootiest.com>
Date: Tue, 18 Mar 2025 22:29:45 -0400
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20Feat(scrolling):=20smarter=20<C-u>?=
 =?UTF-8?q?=20and=20<C-d>?=
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Allows <C-u> and <C-d> to accept a count and scroll by <count>*<half-screen>. The count is
remembered and re-used for both <C-u> and <C-d> so repetitively pressing those sequences will
continue to use the previous count. Count defaults to 1 initally (scroll by one half-screen)
---
 lua/config/overrides.lua | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/lua/config/overrides.lua b/lua/config/overrides.lua
index 92bc216..abd40fd 100644
--- a/lua/config/overrides.lua
+++ b/lua/config/overrides.lua
@@ -106,3 +106,42 @@ vim.keymap.set(
   'Q',
   { noremap = true, desc = 'Replay last register' }
 )
+
+---------------------------------------------------------------------------
+--          ╓─────────────────────────────────────────────────────────╖
+--          ║  Scroll half a screen with <C-d> and <C-u>              ║
+--          ║           (with count and memory)                       ║
+--          ╙─────────────────────────────────────────────────────────╜
+local last_scroll_count = 1 -- Store the last used count
+
+-- Define the ScrollDirection type
+---@alias ScrollDirection 'up'|'down'
+
+--- Scroll half a screen up or down
+---@param direction ScrollDirection The direction to scroll in
+local function scroll(direction)
+  -- Set the count to the provided count or the last used count
+  local count = vim.v.count > 0 and vim.v.count or last_scroll_count
+  -- Remember the count for next time
+  last_scroll_count = count
+  -- Calculate the number of lines in a half-screen
+  local half_screen = math.floor(vim.api.nvim_win_get_height(0) / 2)
+  -- Generate the key sequence
+  local keys = count * half_screen .. (direction == 'down' and '\x04' or '\x15')
+
+  -- Execute the key sequence
+  vim.api.nvim_feedkeys(
+    vim.api.nvim_replace_termcodes(keys, true, false, true),
+    'n',
+    false
+  )
+end
+
+-- Map the scroll functions to <C-d> and <C-u>
+vim.keymap.set('n', '<C-d>', function()
+  scroll('down')
+end, { silent = true })
+vim.keymap.set('n', '<C-u>', function()
+  scroll('up')
+end, { silent = true })
+---------------------------------------------------------------------------