Enhances UI with bufferline, diagnostics, and theme

- Integrates plugins for improved buffer management (bufferline, bufdelete) and diagnostics display (trouble).
- Applies the Catppuccin theme for a refreshed visual experience.
- Updates Neovim settings to support new UI elements and enable Nerd Fonts.

init.lua

@@ -91,7 +91,7 @@ vim.g.mapleader = ' '
 vim.g.maplocalleader = ' '
 
 -- Set to true if you have a Nerd Font installed and selected in the terminal
-vim.g.have_nerd_font = false
+vim.g.have_nerd_font = true
 
 -- [[ Setting options ]]
 -- See `:help vim.o`
@@ -123,6 +123,12 @@ vim.o.mouse = 'a'
 -- Don't show the mode, since it's already in the status line
 vim.o.showmode = false
 
+-- Hide the command line when not in use
+vim.o.cmdheight = 1
+
+-- Hide the default tab line since we're using bufferline
+vim.o.showtabline = 0
+
 -- Sync clipboard between OS and Neovim.
 --  Schedule the setting after `UiEnter` because it can increase startup-time.
 --  Remove this option if you want your OS clipboard to remain independent.
@@ -362,6 +368,7 @@ require('lazy').setup({
         { '<leader>s', group = '[S]earch' },
         { '<leader>t', group = '[T]oggle' },
         { '<leader>h', group = 'Git [H]unk', mode = { 'n', 'v' } },
+        { '<leader>b', group = '[B]uffer' },
       },
     },
   },

lua/custom/plugins/bufdelete.lua

@@ -0,0 +1,18 @@
+-- filepath: /home/kali/.config/nvim/lua/custom/plugins/bufdelete.lua
+-- Bufdelete for properly closing buffers
+-- https://github.com/famiu/bufdelete.nvim
+
+return {
+  'famiu/bufdelete.nvim',
+  event = "VeryLazy", -- lazy load
+  config = function()
+    -- Key mappings to delete buffers
+    vim.keymap.set('n', '<leader>bd', function()
+      require("bufdelete").bufdelete(0, false)
+    end, {noremap = true, desc = "Delete buffer"})
+    
+    vim.keymap.set('n', '<leader>bD', function()
+      require("bufdelete").bufdelete(0, true)
+    end, {noremap = true, desc = "Delete buffer (force)"})
+  end
+}

lua/custom/plugins/bufferline.lua

@@ -0,0 +1,87 @@
+-- filepath: /home/kali/.config/nvim/lua/custom/plugins/bufferline.lua
+-- Bufferline configuration
+-- https://github.com/akinsho/bufferline.nvim
+
+return {
+  'akinsho/bufferline.nvim',
+  version = "*", -- use the latest stable version
+  event = "VeryLazy", -- lazy load for better startup
+  dependencies = {
+    'nvim-tree/nvim-web-devicons', -- for file icons
+  },
+  opts = {
+    options = {
+      -- Themes and appearance
+      indicator = {
+        style = 'icon',
+        icon = '▎',
+      },
+      buffer_close_icon = '󰅖',
+      modified_icon = '●',
+      close_icon = '',
+      left_trunc_marker = '',
+      right_trunc_marker = '',
+      max_name_length = 18,
+      max_prefix_length = 15,
+      truncate_names = true,
+      tab_size = 18,
+      diagnostics = "nvim_lsp", -- Use LSP diagnostics
+      diagnostics_update_in_insert = false,
+      diagnostics_indicator = function(count, level, diagnostics_dict, context)
+        local icon = level:match("error") and " " or " "
+        return " " .. icon .. count
+      end,
+      offsets = {
+        {
+          filetype = "neo-tree",
+          text = "File Explorer",
+          text_align = "center",
+          separator = true
+        }
+      },
+      color_icons = true,
+      show_buffer_icons = true,
+      show_buffer_close_icons = true,
+      show_close_icon = true,
+      show_tab_indicators = true,
+      separator_style = "thin",
+      enforce_regular_tabs = false,
+      always_show_bufferline = true,
+      hover = {
+        enabled = true,
+        delay = 200,
+        reveal = {'close'}
+      },
+    },
+    -- Colorscheme integration
+    highlights = {
+      -- These are automatically integrated with your colorscheme
+    },
+  },
+  config = function(_, opts)
+    require("bufferline").setup(opts)
+    
+    -- Key mappings for navigating between buffers
+    vim.keymap.set('n', '<leader>bp', '<cmd>BufferLinePick<CR>', {noremap = true, desc = "Pick buffer"})
+    vim.keymap.set('n', '<leader>bc', '<cmd>BufferLinePickClose<CR>', {noremap = true, desc = "Pick buffer to close"})
+    vim.keymap.set('n', '<leader>bh', '<cmd>BufferLineCyclePrev<CR>', {noremap = true, desc = "Previous buffer"})
+    vim.keymap.set('n', '<leader>bl', '<cmd>BufferLineCycleNext<CR>', {noremap = true, desc = "Next buffer"})
+    vim.keymap.set('n', '<leader>bH', '<cmd>BufferLineMovePrev<CR>', {noremap = true, desc = "Move buffer left"})
+    vim.keymap.set('n', '<leader>bL', '<cmd>BufferLineMoveNext<CR>', {noremap = true, desc = "Move buffer right"})
+    vim.keymap.set('n', '<leader>b1', '<cmd>BufferLineGoToBuffer 1<CR>', {noremap = true, desc = "Go to buffer 1"})
+    vim.keymap.set('n', '<leader>b2', '<cmd>BufferLineGoToBuffer 2<CR>', {noremap = true, desc = "Go to buffer 2"})
+    vim.keymap.set('n', '<leader>b3', '<cmd>BufferLineGoToBuffer 3<CR>', {noremap = true, desc = "Go to buffer 3"})
+    vim.keymap.set('n', '<leader>b4', '<cmd>BufferLineGoToBuffer 4<CR>', {noremap = true, desc = "Go to buffer 4"})
+    vim.keymap.set('n', '<leader>b5', '<cmd>BufferLineGoToBuffer 5<CR>', {noremap = true, desc = "Go to buffer 5"})
+    vim.keymap.set('n', '<leader>b6', '<cmd>BufferLineGoToBuffer 6<CR>', {noremap = true, desc = "Go to buffer 6"})
+    vim.keymap.set('n', '<leader>b7', '<cmd>BufferLineGoToBuffer 7<CR>', {noremap = true, desc = "Go to buffer 7"})
+    vim.keymap.set('n', '<leader>b8', '<cmd>BufferLineGoToBuffer 8<CR>', {noremap = true, desc = "Go to buffer 8"})
+    vim.keymap.set('n', '<leader>b9', '<cmd>BufferLineGoToBuffer 9<CR>', {noremap = true, desc = "Go to buffer 9"})
+    
+    -- Additional keymaps for Alt+number to switch buffers quickly
+    for i = 1, 9 do
+      vim.keymap.set('n', string.format('<A-%s>', i), string.format('<cmd>BufferLineGoToBuffer %s<CR>', i), 
+        {noremap = true, desc = string.format("Go to buffer %s", i)})
+    end
+  end,
+}

lua/custom/plugins/catppuccin.lua

@@ -0,0 +1,80 @@
+-- In your plugins configuration file (e.g., lua/plugins/catppuccin.lua or similar)
+return {
+  {
+    'catppuccin/nvim',
+    name = 'catppuccin', -- Optional, but can be useful for referring to the plugin
+    priority = 1000, -- Ensure it loads early to apply the colorscheme
+    lazy = false, -- Load on startup if you want it as your default theme
+    config = function()
+      -- Load the colorscheme here
+      -- vim.cmd.colorscheme "catppuccin" -- Default is "mocha" if no flavour is specified
+
+      -- Or, to specify a flavour and set up integrations:
+      require('catppuccin').setup {
+        flavour = 'mocha', -- latte, frappe, macchiato, mocha
+        background = { -- :h background
+          light = 'latte',
+          dark = 'mocha',
+        },
+        transparent_background = false, -- useful if you want the underlying terminal colors to show through
+        show_end_of_buffer = false, -- shows the '~' characters after the end of buffers
+        term_colors = true, -- Toggles Neovim terminal colors for the Catppuccin palette.
+        dim_inactive = {
+          enabled = false, -- dims inactive windows
+          shade = 'dark',
+          percentage = 0.15,
+        },
+        no_italic = false, -- Force no italic
+        no_bold = false, -- Force no bold
+        no_underline = false, -- Force no underline
+        styles = { -- Handles the styles of general hi groups (see `:h highlight-args`):
+          comments = { 'italic' },
+          conditionals = { 'italic' },
+          loops = {},
+          functions = {},
+          keywords = {},
+          strings = {},
+          variables = {},
+          numbers = {},
+          booleans = {},
+          properties = {},
+          types = {},
+          operators = {},
+          -- miscs = {}, -- Custom groups for miscellaneous items specific to firmware development
+        },
+        color_overrides = {},
+        custom_highlights = {},
+        integrations = {
+          cmp = true,
+          gitsigns = true,
+          nvimtree = true,
+          telescope = true,
+          notify = true,
+          mini = {
+            enabled = true,
+            indentscope_color = '',
+          },
+          -- For more plugins integrations please check integration table in the README project
+          native_lsp = {
+            enabled = true,
+            underlines = {
+              errors = { 'undercurl' },
+              hints = { 'undercurl' },
+              warnings = { 'undercurl' },
+              information = { 'undercurl' },
+            },
+          },
+          headlines = true,
+          indent_blankline = {
+            enabled = true,
+            scope_color = 'mauve', -- catppuccin color a available flavor
+            -- Also a vailable: latte, frappe, macchiato, mocha
+          },
+        },
+      }
+
+      -- After setting up, set the colorscheme
+      vim.cmd.colorscheme 'catppuccin'
+    end,
+  },
+}

lua/custom/plugins/trouble.lua

@@ -0,0 +1,87 @@
+-- Trouble - A pretty diagnostics, references, telescope results, quickfix and location list
+-- https://github.com/folke/trouble.nvim
+
+return {
+  "folke/trouble.nvim",
+  dependencies = { "nvim-tree/nvim-web-devicons" },
+  event = { "BufReadPost", "BufNewFile" },
+  cmd = { "TroubleToggle", "Trouble" },
+  opts = {
+    position = "bottom", -- position of the list can be: bottom, top, left, right
+    height = 12, -- height of the trouble list when position is top or bottom
+    width = 50, -- width of the list when position is left or right
+    icons = true, -- use devicons for filenames
+    mode = "workspace_diagnostics", -- "workspace_diagnostics", "document_diagnostics", "quickfix", "lsp_references", "loclist"
+    severity = nil, -- nil (ALL) or vim.diagnostic.severity.ERROR | WARN | INFO | HINT
+    fold_open = "", -- icon used for open folds
+    fold_closed = "", -- icon used for closed folds
+    group = true, -- group results by file
+    padding = true, -- add an extra new line on top of the list
+    action_keys = { -- key mappings for actions in the trouble list
+      close = "q", -- close the list
+      cancel = "<esc>", -- cancel the preview and get back to your last window / buffer / cursor
+      refresh = "r", -- manually refresh
+      jump = { "<cr>", "<tab>", "<2-leftmouse>" }, -- jump to the diagnostic or open / close folds
+      open_split = { "<c-x>" }, -- open buffer in new split
+      open_vsplit = { "<c-v>" }, -- open buffer in new vsplit
+      open_tab = { "<c-t>" }, -- open buffer in new tab
+      jump_close = {"o"}, -- jump to the diagnostic and close the list
+      toggle_mode = "m", -- toggle between "workspace" and "document" diagnostics mode
+      switch_severity = "s", -- switch "diagnostics" severity filter
+      toggle_preview = "P", -- toggle auto_preview
+      hover = "K", -- opens a small popup with the full multiline message
+      preview = "p", -- preview the diagnostic location
+      open_code_href = "c", -- if present, open a URI with more information about the diagnostic error
+      close_folds = {"zM", "zm"}, -- close all folds
+      open_folds = {"zR", "zr"}, -- open all folds
+      toggle_fold = {"zA", "za"}, -- toggle fold of current file
+      previous = "k", -- previous item
+      next = "j", -- next item
+      help = "?" -- help menu
+    },
+    multiline = true, -- render multi-line messages
+    indent_lines = true, -- add an indent guide below the fold icons
+    win_config = { border = "rounded" }, -- window configuration for floating windows
+    auto_open = false, -- automatically open the list when you have diagnostics
+    auto_close = false, -- automatically close the list when you have no diagnostics
+    auto_preview = true, -- automatically preview the location of the diagnostic. <esc> to close preview and go back to last window
+    auto_fold = false, -- automatically fold a file trouble list at creation
+    auto_jump = {"lsp_definitions"}, -- for the given modes, automatically jump if there is only a single result
+    signs = {
+      -- icons / text used for a diagnostic
+      error = "",
+      warning = "",
+      hint = "",
+      information = "",
+      other = "",
+    },
+    use_diagnostic_signs = false -- enabling this will use the signs defined in your lsp client
+  },
+  keys = {
+    { "<leader>xx", "<cmd>TroubleToggle document_diagnostics<cr>", desc = "Document Diagnostics (Trouble)" },
+    { "<leader>xX", "<cmd>TroubleToggle workspace_diagnostics<cr>", desc = "Workspace Diagnostics (Trouble)" },
+    { "<leader>xL", "<cmd>TroubleToggle loclist<cr>", desc = "Location List (Trouble)" },
+    { "<leader>xQ", "<cmd>TroubleToggle quickfix<cr>", desc = "Quickfix List (Trouble)" },
+    { "gR", "<cmd>TroubleToggle lsp_references<cr>", desc = "LSP References (Trouble)" },
+    { "gD", "<cmd>TroubleToggle lsp_definitions<cr>", desc = "LSP Definitions (Trouble)" },
+    { "<leader>xT", "<cmd>TodoTrouble<cr>", desc = "TODOs (Trouble)", cond = function() return require("lazy.core.config").spec.plugins["todo-comments"] ~= nil end },
+  },
+  config = function(_, opts)
+    require("trouble").setup(opts)
+    
+    -- Add which-key group
+    local ok, which_key = pcall(require, "which-key")
+    if ok then
+      which_key.register({
+        ["<leader>x"] = { 
+          name = "Trouble/Diagnostics", 
+          x = { "<cmd>TroubleToggle document_diagnostics<cr>", "Document Diagnostics" },
+          X = { "<cmd>TroubleToggle workspace_diagnostics<cr>", "Workspace Diagnostics" },
+          L = { "<cmd>TroubleToggle loclist<cr>", "Location List" },
+          Q = { "<cmd>TroubleToggle quickfix<cr>", "Quickfix List" },
+          T = { "<cmd>TodoTrouble<cr>", "TODOs" },
+        },
+      })
+    end
+  end,
+}