refactor: improve Neovim config for better readability and functionality

- Switch to Lua API options for setting vim options instead of vim.cmd
- Add autocmd to trim trailing whitespace on save (except markdown)
- Disable auto-comments via autocmd for all filetypes
- Enhance and standardize key mappings with noremap and silent flags
- Clean up plugin config indentation and comments

2 files changed, 70 insertions, 37 deletions

diff --git a/config/nvim/init.lua b/config/nvim/init.lua
index df90607..ea8a3d2 100644
--- a/config/nvim/init.lua
+++ b/config/nvim/init.lua
@@ -1,15 +1,14 @@
 require("plugins")
 
-vim.cmd("let mapleader = ' '")
-vim.cmd("set relativenumber")
-vim.cmd("set number")
-vim.cmd("colorscheme duskfox")
-vim.cmd("set nowrap")
-vim.cmd("set clipboard=unnamedplus") -- Use system clipboard
-vim.cmd("set background=dark")
-vim.cmd("set shm+=I")	-- Disable intro message
-vim.cmd("autocmd FileType * setlocal formatoptions-=c formatoptions-=r formatoptions-=o") -- Disable auto-comment
--- vim.cmd("set list")	-- Show spaces tabs etc.
+vim.g.mapleader = ' '
+vim.opt.background = "dark"
+vim.opt.clipboard = "unnamedplus" -- Use system clipboard
+vim.opt.list = true               -- Show spaces, tabs, etc.
+vim.opt.number = true
+vim.opt.relativenumber = true
+vim.opt.shortmess:append("I")     -- Disable intro message
+vim.opt.wrap = false
+vim.cmd.colorscheme("duskfox")
 
 vim.opt.fillchars = {
     vert = "|",
@@ -22,16 +21,54 @@ vim.opt.fillchars = {
     foldclose = ">",
 }
 
-vim.keymap.set('n', '<leader><leader>', ':w!<CR>')
-vim.keymap.set('n', '<leader>q', ':wq!<CR>')
-vim.keymap.set('n', '<C-t>', ':tabnew<CR>')
-vim.keymap.set('n', 'J', ':tabn<CR>')
-vim.keymap.set('n', 'K', ':tabp<CR>')
-vim.keymap.set('n', '<C-n>', ':vsplit<CR>')
-vim.keymap.set('n', 'H', ':wincmd h<CR>')
-vim.keymap.set('n', 'L', ':wincmd l<CR>')
-vim.keymap.set('n', '<leader>e', ':Neotree toggle right<CR>')
-vim.keymap.set('n', '<leader>o', '<C-W>w')
-vim.keymap.set('i', '<C-h>', '<Left>')
-vim.keymap.set('i', '<C-l>', '<Right>')
-vim.keymap.set('i', '<C-space>', '<ESC>')
+-- Remove trailing whitespace on all lines before saving, excluding markdown files
+vim.api.nvim_create_autocmd("BufWritePre", {
+  pattern = "*",
+  callback = function()
+    if vim.bo.filetype == "markdown" then
+      return
+    end
+    vim.cmd([[%s/\s\+$//e]])
+  end,
+})
+
+-- Disable auto-comment
+vim.api.nvim_create_autocmd("FileType", {
+  pattern = "*",
+  callback = function()
+    vim.opt_local.formatoptions:remove({ "c", "r", "o" })
+  end,
+})
+
+
+-- NOTE: On some terminal emulators, the keybinds
+-- <C-j> and <C-k> don't work either in normal or insert mode.
+
+-- Tabs
+vim.keymap.set('n', '<C-t>', '<cmd>tabnew<CR>'  , { noremap = true, silent = true })
+vim.keymap.set('n', 'H'    , '<cmd>wincmd h<CR>', { noremap = true, silent = true })
+vim.keymap.set('n', 'J'    , '<cmd>tabn<CR>'    , { noremap = true, silent = true })
+vim.keymap.set('n', 'K'    , '<cmd>tabp<CR>'    , { noremap = true, silent = true })
+vim.keymap.set('n', 'L'    , '<cmd>wincmd l<CR>', { noremap = true, silent = true })
+
+-- Windows
+vim.keymap.set('n', '<C-Down>' , '<cmd>split<CR>' , { noremap = true, silent = true })
+vim.keymap.set('n', '<C-Right>', '<cmd>vsplit<CR>', { noremap = true, silent = true })
+vim.keymap.set('n', '<C-h>'    , '<C-w>h'         , { noremap = true })
+vim.keymap.set('n', '<C-j>'    , '<C-w>j'         , { noremap = true })
+vim.keymap.set('n', '<C-k>'    , '<C-w>k'         , { noremap = true })
+vim.keymap.set('n', '<C-l>'    , '<C-w>l'         , { noremap = true })
+
+-- Imitate normal mode in insert mode
+vim.keymap.set('i', '<C-h>'    , '<Left>' , { noremap = true })
+vim.keymap.set('i', '<C-l>'    , '<Right>', { noremap = true })
+vim.keymap.set('i', '<C-j>'    , '<Down>' , { noremap = true })
+vim.keymap.set('i', '<C-k>'    , '<Up>'   , { noremap = true })
+vim.keymap.set('i', '<C-space>', '<ESC>'  , { noremap = true })
+
+-- Plugins
+vim.keymap.set('n', '<leader>e', '<cmd>Neotree toggle right<CR>', { noremap = true, silent = true })
+
+-- Other
+vim.keymap.set('n', '<leader><leader>', '<cmd>w!<CR>' , { noremap = true, silent = true })
+vim.keymap.set('n', '<leader>q'       , '<cmd>wq!<CR>', { noremap = true, silent = true })
diff --git a/config/nvim/lua/plugins.lua b/config/nvim/lua/plugins.lua
index 911a4d7..7b00b1c 100644
--- a/config/nvim/lua/plugins.lua
+++ b/config/nvim/lua/plugins.lua
@@ -33,18 +33,18 @@ require("lazy").setup({
 })
 
 require("Comment").setup{
-    padding = true,	-- Add a space b/w comment and the line
-    sticky = true,	-- Whether the cursor should stay at its position
-    ignore = nil,	-- Lines to be ignored while (un)comment
+    padding = true,   -- Add a space b/w comment and the line
+    sticky = true,    -- Whether the cursor should stay at its position
+    ignore = nil,     -- Lines to be ignored while (un)comment
     -- LHS of toggle mappings in NORMAL mode
     toggler = {
-        line = 'cc', 	--Line-comment toggle keymap
-        block = 'cb', 	-- Block-comment toggle keymap
+        line = 'cc',  --Line-comment toggle keymap
+        block = 'cb', -- Block-comment toggle keymap
     },
     -- LHS of operator-pending mappings in NORMAL and VISUAL mode
     opleader = {
-        line = 'cc', 	--Line-comment keymap
-        block = 'cb',	--Block-comment keymap
+        line = 'cc',  --Line-comment keymap
+        block = 'cb', --Block-comment keymap
     },
 }
 
@@ -72,25 +72,21 @@ require("neo-tree").setup({
 			}
 		}
 	},
-	--Indent Markers
 	default_component_configs = {
 		indent = {
+			--Indent Markers
 			with_markers = true,
 			indent_marker = "│",
 			last_indent_marker = "└",
 			indent_size = 2,
-		},
-	},
-	--Expanders
-	default_component_configs = {
-		indent = {
+			-- Expanders
 			with_expanders = false, --Not active
 			expander_collapsed = ">",
 			expander_expanded = "",
 			expander_highlight = "NeoTreeExpander",
+
 		},
 	},
-
 })
 
 require("nvim-autopairs").setup({