chore(Keymaps): refactor and add duplicate selection keymap

lua/aquila/core/keymaps.lua

@@ -9,11 +9,12 @@ set({ 'i', 'n' }, "<C-s>", '<cmd>w<CR>')                   -- i love windows beh
 set({ 'n', 'v', 'i' }, '<C-z>', '<Nop>')                   -- fix problem when CTRL + Z is exit neovim
 set('n', '<C-c>', '<Nop>')                                 -- fix probelm when CTRL + C in normal mode is exit neovim
 
--- same like alt + up/down at vscode
+-- same behavior like alt + up/down in vscode
+-- the selected line will move one line up/down
 set("v", "J", ":m '>+1<CR>gv=gv")
 set("v", "K", ":m '<-2<CR>gv=gv")
 
--- when you are in search mode and move with 'n'/'N' for the next matches, the window is stick center
+-- pressing `n/N` for the next/prev matches in search mode, will make the matches line center
 set("n", "n", "nzzzv")
 set("n", "N", "Nzzzv")
 
@@ -25,6 +26,7 @@ set({ "n", "v" }, "<Leader>p", "\"+p", { desc = "Paste from system clipboard" })
 set("v", "<leader>P", '"_dP', { desc = 'Do not lose the " register on paste' })
 set("n", "x", '"_x', { desc = 'Do not lose the " register on delete' })
 set("n", "c", '"_c', { desc = 'Do not lose the " register on change' })
+set("n", "s", '"_s', { desc = 'Do not lose the " register on replace' })
 
 set("n", "<Leader>~", '<cmd>Alpha<CR>', { desc = "Take me home to the place i belong ~~" })
 
@@ -44,3 +46,24 @@ set("n", "dd", function()
     end,
     { expr = true }
 )
+
+-- DUPLICATE VISUAL SELECTION
+local duplicate_selection = function()
+    local save_reg = vim.fn.getreginfo([["]])
+
+    local visual_mode = vim.fn.mode()
+    if visual_mode == "v" or visual_mode == "V" then
+        vim.fn.execute [[noautocmd normal! y`>p]]
+    else
+        vim.fn.execute [[noautocmd normal! yP]]
+    end
+
+    vim.fn.setreg([["]], save_reg.regcontents, save_reg.regtype)
+end
+set('v', '<C-d>', duplicate_selection, { desc = 'Duplicate selection' })
+set('v', '<C-M-d>', function()
+        duplicate_selection()
+        vim.fn.execute [[noautocmd normal! gv]]
+    end,
+    { desc = 'Duplicate selection (keep selection)' }
+)