feat: opinionated tmux and neovim configs

tmux:
- Ctrl+a prefix (easier than Ctrl+b)
- Vim-style pane navigation (h/j/k/l)
- Intuitive splits (| and - keys)
- Alt+arrow for quick pane switching
- Tokyo Night theme matching neovim
- Copy mode with vim keybindings

neovim:
- Space as leader key
- Tokyo Night colorscheme (no plugins)
- Better defaults (relative numbers, smart search)
- Quality of life keymaps (jk/jj to exit insert)
- Custom statusline
- Useful autocommands (yank highlight, trim whitespace)

Author: devatnull

backend/containers/nvim-config/init.lua

@@ -1,70 +1,250 @@
--- Minimal Neovim config for learning
--- Keep it simple so learners can understand what's happening
-
--- Basic settings
-vim.opt.number = true           -- Line numbers
-vim.opt.relativenumber = true   -- Relative line numbers
-vim.opt.mouse = 'a'             -- Enable mouse
-vim.opt.clipboard = 'unnamedplus' -- System clipboard
-vim.opt.expandtab = true        -- Spaces instead of tabs
-vim.opt.tabstop = 2             -- 2 spaces per tab
-vim.opt.shiftwidth = 2          -- 2 spaces for indent
-vim.opt.smartindent = true      -- Smart indentation
-vim.opt.wrap = false            -- No line wrapping
-vim.opt.cursorline = true       -- Highlight current line
-vim.opt.termguicolors = true    -- True colors
-vim.opt.signcolumn = 'yes'      -- Always show sign column
-vim.opt.scrolloff = 8           -- Keep 8 lines visible
-vim.opt.updatetime = 250        -- Faster updates
-vim.opt.timeoutlen = 500        -- Faster key sequences
-vim.opt.ignorecase = true       -- Case insensitive search
-vim.opt.smartcase = true        -- Unless uppercase used
-vim.opt.hlsearch = true         -- Highlight search
-vim.opt.incsearch = true        -- Incremental search
-
--- Better colors (simple dark theme)
-vim.cmd [[
-  colorscheme default
-  highlight Normal guibg=#1a1b26 guifg=#a9b1d6
-  highlight LineNr guifg=#565f89
-  highlight CursorLine guibg=#24283b
-  highlight CursorLineNr guifg=#7aa2f7
-  highlight Visual guibg=#364a82
-  highlight StatusLine guibg=#1a1b26 guifg=#a9b1d6
-  highlight Search guibg=#7aa2f7 guifg=#1a1b26
-  highlight IncSearch guibg=#f7768e guifg=#1a1b26
-]]
-
--- Leader key
-vim.g.mapleader = ' '
-
--- Basic keymaps for learning
-vim.keymap.set('n', '<leader>w', ':w<CR>', { desc = 'Save file' })
-vim.keymap.set('n', '<leader>q', ':q<CR>', { desc = 'Quit' })
-vim.keymap.set('n', '<Esc>', ':noh<CR>', { desc = 'Clear search highlight' })
+-- Opinionated Neovim config for learning
+-- No plugins required - pure Lua config
+
+-- ============================================
+-- Options
+-- ============================================
+
+vim.g.mapleader = " "
+vim.g.maplocalleader = " "
+
+local opt = vim.opt
+
+-- Line numbers
+opt.number = true
+opt.relativenumber = true
+opt.signcolumn = "yes"
+
+-- Tabs & indentation
+opt.tabstop = 2
+opt.shiftwidth = 2
+opt.expandtab = true
+opt.smartindent = true
+opt.autoindent = true
+
+-- Search
+opt.ignorecase = true
+opt.smartcase = true
+opt.hlsearch = true
+opt.incsearch = true
+
+-- Appearance
+opt.termguicolors = true
+opt.cursorline = true
+opt.scrolloff = 8
+opt.sidescrolloff = 8
+opt.wrap = false
+opt.showmode = false
+opt.colorcolumn = "80"
+
+-- Behavior
+opt.mouse = "a"
+opt.clipboard = "unnamedplus"
+opt.splitright = true
+opt.splitbelow = true
+opt.undofile = true
+opt.swapfile = false
+opt.updatetime = 250
+opt.timeoutlen = 300
+opt.completeopt = "menuone,noselect"
+
+-- ============================================
+-- Tokyo Night colorscheme (inline)
+-- ============================================
+
+local colors = {
+  bg = "#1a1b26",
+  bg_dark = "#16161e",
+  bg_highlight = "#292e42",
+  blue = "#7aa2f7",
+  cyan = "#7dcfff",
+  fg = "#c0caf5",
+  fg_dark = "#a9b1d6",
+  fg_gutter = "#3b4261",
+  green = "#9ece6a",
+  magenta = "#bb9af7",
+  orange = "#ff9e64",
+  red = "#f7768e",
+  yellow = "#e0af68",
+  comment = "#565f89",
+  visual = "#364a82",
+}
+
+-- Apply colors
+vim.cmd("hi clear")
+vim.cmd("hi Normal guibg=" .. colors.bg .. " guifg=" .. colors.fg)
+vim.cmd("hi NormalFloat guibg=" .. colors.bg_dark .. " guifg=" .. colors.fg)
+vim.cmd("hi Cursor guibg=" .. colors.fg .. " guifg=" .. colors.bg)
+vim.cmd("hi CursorLine guibg=" .. colors.bg_highlight)
+vim.cmd("hi CursorLineNr guifg=" .. colors.blue .. " gui=bold")
+vim.cmd("hi LineNr guifg=" .. colors.fg_gutter)
+vim.cmd("hi SignColumn guibg=" .. colors.bg)
+vim.cmd("hi ColorColumn guibg=" .. colors.bg_highlight)
+vim.cmd("hi Visual guibg=" .. colors.visual)
+vim.cmd("hi Search guibg=" .. colors.blue .. " guifg=" .. colors.bg)
+vim.cmd("hi IncSearch guibg=" .. colors.orange .. " guifg=" .. colors.bg)
+vim.cmd("hi StatusLine guibg=" .. colors.bg_dark .. " guifg=" .. colors.fg_dark)
+vim.cmd("hi StatusLineNC guibg=" .. colors.bg_dark .. " guifg=" .. colors.comment)
+vim.cmd("hi VertSplit guifg=" .. colors.fg_gutter)
+vim.cmd("hi Pmenu guibg=" .. colors.bg_dark .. " guifg=" .. colors.fg)
+vim.cmd("hi PmenuSel guibg=" .. colors.visual .. " guifg=" .. colors.fg)
+vim.cmd("hi Comment guifg=" .. colors.comment .. " gui=italic")
+vim.cmd("hi String guifg=" .. colors.green)
+vim.cmd("hi Number guifg=" .. colors.orange)
+vim.cmd("hi Boolean guifg=" .. colors.orange)
+vim.cmd("hi Constant guifg=" .. colors.orange)
+vim.cmd("hi Identifier guifg=" .. colors.magenta)
+vim.cmd("hi Function guifg=" .. colors.blue)
+vim.cmd("hi Statement guifg=" .. colors.magenta)
+vim.cmd("hi Keyword guifg=" .. colors.cyan)
+vim.cmd("hi Type guifg=" .. colors.cyan)
+vim.cmd("hi Special guifg=" .. colors.blue)
+vim.cmd("hi Error guifg=" .. colors.red)
+vim.cmd("hi WarningMsg guifg=" .. colors.yellow)
+vim.cmd("hi Title guifg=" .. colors.blue .. " gui=bold")
+vim.cmd("hi Directory guifg=" .. colors.blue)
+vim.cmd("hi MatchParen guibg=" .. colors.visual .. " gui=bold")
+vim.cmd("hi NonText guifg=" .. colors.fg_gutter)
+vim.cmd("hi Folded guibg=" .. colors.bg_highlight .. " guifg=" .. colors.comment)
+
+-- ============================================
+-- Keymaps
+-- ============================================
+
+local map = vim.keymap.set
+
+-- Better escape
+map("i", "jk", "<Esc>", { desc = "Exit insert mode" })
+map("i", "jj", "<Esc>", { desc = "Exit insert mode" })
+
+-- Save
+map("n", "<leader>w", "<cmd>w<cr>", { desc = "Save file" })
+map("n", "<C-s>", "<cmd>w<cr>", { desc = "Save file" })
+
+-- Quit
+map("n", "<leader>q", "<cmd>q<cr>", { desc = "Quit" })
+map("n", "<leader>Q", "<cmd>qa!<cr>", { desc = "Quit all" })
+
+-- Clear search
+map("n", "<Esc>", "<cmd>nohlsearch<cr>", { desc = "Clear search" })
 
 -- Better window navigation
-vim.keymap.set('n', '<C-h>', '<C-w>h', { desc = 'Move to left window' })
-vim.keymap.set('n', '<C-j>', '<C-w>j', { desc = 'Move to lower window' })
-vim.keymap.set('n', '<C-k>', '<C-w>k', { desc = 'Move to upper window' })
-vim.keymap.set('n', '<C-l>', '<C-w>l', { desc = 'Move to right window' })
+map("n", "<C-h>", "<C-w>h", { desc = "Go to left window" })
+map("n", "<C-j>", "<C-w>j", { desc = "Go to lower window" })
+map("n", "<C-k>", "<C-w>k", { desc = "Go to upper window" })
+map("n", "<C-l>", "<C-w>l", { desc = "Go to right window" })
+
+-- Resize windows
+map("n", "<C-Up>", "<cmd>resize +2<cr>", { desc = "Increase height" })
+map("n", "<C-Down>", "<cmd>resize -2<cr>", { desc = "Decrease height" })
+map("n", "<C-Left>", "<cmd>vertical resize -2<cr>", { desc = "Decrease width" })
+map("n", "<C-Right>", "<cmd>vertical resize +2<cr>", { desc = "Increase width" })
+
+-- Move lines
+map("v", "J", ":m '>+1<cr>gv=gv", { desc = "Move down" })
+map("v", "K", ":m '<-2<cr>gv=gv", { desc = "Move up" })
 
 -- Stay in visual mode when indenting
-vim.keymap.set('v', '<', '<gv', { desc = 'Indent left' })
-vim.keymap.set('v', '>', '>gv', { desc = 'Indent right' })
+map("v", "<", "<gv", { desc = "Indent left" })
+map("v", ">", ">gv", { desc = "Indent right" })
 
--- Move lines up/down in visual mode
-vim.keymap.set('v', 'J', ":m '>+1<CR>gv=gv", { desc = 'Move selection down' })
-vim.keymap.set('v', 'K', ":m '<-2<CR>gv=gv", { desc = 'Move selection up' })
+-- Better paste (don't replace clipboard)
+map("v", "p", '"_dP', { desc = "Paste without yanking" })
 
--- Show which-key style help (built-in)
-vim.keymap.set('n', '<leader>?', function()
-  print("Leader commands: <leader>w = save, <leader>q = quit")
-end, { desc = 'Show help' })
+-- Center cursor after jumps
+map("n", "<C-d>", "<C-d>zz", { desc = "Scroll down" })
+map("n", "<C-u>", "<C-u>zz", { desc = "Scroll up" })
+map("n", "n", "nzzzv", { desc = "Next search result" })
+map("n", "N", "Nzzzv", { desc = "Previous search result" })
 
+-- Splits
+map("n", "<leader>-", "<cmd>split<cr>", { desc = "Horizontal split" })
+map("n", "<leader>|", "<cmd>vsplit<cr>", { desc = "Vertical split" })
+
+-- Buffers
+map("n", "<leader>bn", "<cmd>bnext<cr>", { desc = "Next buffer" })
+map("n", "<leader>bp", "<cmd>bprevious<cr>", { desc = "Previous buffer" })
+map("n", "<leader>bd", "<cmd>bdelete<cr>", { desc = "Delete buffer" })
+
+-- File explorer (netrw)
+map("n", "<leader>e", "<cmd>Explore<cr>", { desc = "File explorer" })
+
+-- ============================================
+-- Statusline
+-- ============================================
+
+local function mode_color()
+  local modes = {
+    n = colors.blue,
+    i = colors.green,
+    v = colors.magenta,
+    V = colors.magenta,
+    ["\22"] = colors.magenta,
+    c = colors.orange,
+    R = colors.red,
+  }
+  return modes[vim.fn.mode()] or colors.fg
+end
+
+function _G.statusline()
+  local mode = vim.fn.mode():upper()
+  local file = vim.fn.expand("%:t")
+  if file == "" then file = "[No Name]" end
+  local modified = vim.bo.modified and " [+]" or ""
+  local readonly = vim.bo.readonly and " [RO]" or ""
+  local filetype = vim.bo.filetype ~= "" and vim.bo.filetype or "text"
+  local line = vim.fn.line(".")
+  local col = vim.fn.col(".")
+  local total = vim.fn.line("$")
+  
+  return string.format(
+    " %s │ %s%s%s │ %s │ %d:%d / %d ",
+    mode, file, modified, readonly, filetype, line, col, total
+  )
+end
+
+vim.opt.statusline = "%!v:lua.statusline()"
+
+-- ============================================
+-- Autocommands
+-- ============================================
+
+local augroup = vim.api.nvim_create_augroup
+local autocmd = vim.api.nvim_create_autocmd
+
+-- Highlight on yank
+autocmd("TextYankPost", {
+  group = augroup("highlight_yank", { clear = true }),
+  callback = function()
+    vim.highlight.on_yank({ higroup = "Visual", timeout = 200 })
+  end,
+})
+
+-- Remove trailing whitespace on save
+autocmd("BufWritePre", {
+  group = augroup("trim_whitespace", { clear = true }),
+  pattern = "*",
+  command = [[%s/\s\+$//e]],
+})
+
+-- Return to last edit position
+autocmd("BufReadPost", {
+  group = augroup("last_position", { clear = true }),
+  callback = function()
+    local mark = vim.api.nvim_buf_get_mark(0, '"')
+    local lcount = vim.api.nvim_buf_line_count(0)
+    if mark[1] > 0 and mark[1] <= lcount then
+      pcall(vim.api.nvim_win_set_cursor, 0, mark)
+    end
+  end,
+})
+
+-- ============================================
 -- Welcome message
-vim.api.nvim_create_autocmd('VimEnter', {
+-- ============================================
+
+vim.api.nvim_create_autocmd("VimEnter", {
   callback = function()
-    print("Welcome! Press <Space>? for help. Try :Tutor for built-in tutorial!")
-  end
+    vim.notify("Welcome! Space = leader. Try :Tutor for vim tutorial.", vim.log.levels.INFO)
+  end,
 })