Updated Neovim config

home/private_dot_config/nvim/init.lua

@@ -2,5 +2,59 @@
 vim.opt.number = true
 vim.opt.relativenumber = true
 
--- Highlight the current line
-vim.opt.cursorline = true
+-- GUI stuff
+vim.opt.cursorline = true       -- Highlight the current line
+vim.opt.colorcolumn = "80,120"  -- Show vertical ruler
+vim.opt.scrolloff = 8           -- Keep at least 8 lines between the cursor and the borders
+vim.opt.wrap = false            -- Don't wrap long lines
+
+-- Show whitespace characters (tabs, trailing spaces, etc.)
+vim.opt.list = true
+vim.opt.listchars = { tab = '» ', trail = '·', multispace = '·', nbsp = '␣' }
+
+-- Strip trailing whitespace and extra blank lines at end of file on save
+local trim_group = vim.api.nvim_create_augroup('TrimOnSave', { clear = true })
+vim.api.nvim_create_autocmd('BufWritePre', {
+    group = trim_group,
+    pattern = '*',
+    callback = function()
+        local save_view = vim.fn.winsaveview()
+        vim.cmd([[%s/\s\+$//e]])                -- Remove trailing whitespace on every line
+        vim.cmd([[%s/\n\+\%$//e]])              -- Remove all trailing blank lines
+        vim.fn.append(vim.fn.line('$'), '')     -- Always append exactly one blank line at the end
+        vim.fn.setpos('.', save_cursor)         -- Restore the window to where it was before the edits
+    end,
+})
+
+-- Remove background opacity
+vim.api.nvim_set_hl(0, 'Normal', { bg = 'none' })
+vim.api.nvim_set_hl(0, 'NormalFloat', { bg = 'none' })
+
+-- Remember old sessions
+vim.opt.undofile = true
+local restore_cursor_group = vim.api.nvim_create_augroup('RestoreCursor', { clear = true })
+vim.api.nvim_create_autocmd('BufReadPost', {
+    group = restore_cursor_group,
+    callback = function()
+        local mark = vim.api.nvim_buf_get_mark(0, '"')
+        local last_line = vim.api.nvim_buf_line_count(0)
+        if mark[1] > 0 and mark[1] <= last_line then
+            vim.schedule(function()
+                vim.api.nvim_win_set_cursor(0, mark)
+                vim.cmd.normal({ 'zz', bang = true })
+            end)
+        end
+    end,
+})
+
+-- Indentation
+vim.opt.tabstop = 4        -- Visual width of a tab character
+vim.opt.softtabstop = 4    -- Spaces inserted/deleted per Tab/Backspace in insert mode
+vim.opt.shiftwidth = 4     -- Width used by >>, <<, and autoindent
+vim.opt.expandtab = true   -- Typed tabs become spaces
+vim.opt.smartindent = true -- Auto-indent new lines based on syntax (e.g. after '{')
+
+-- Search
+vim.opt.ignorecase = true  -- Case-insensitive search...
+vim.opt.smartcase = true   -- ...unless you type an explicit uppercase letter
+