Added tmux with custom initial setup (marvin only) & blender (both)

Add a second nixosConfigurations entry for a friend's machine running
Plasma 6 + SDDM. The hardware-configuration.nix is a placeholder; it
must be replaced with the output of nixos-generate-config on the
actual hardware before installing. Git identity in hosts/nikita-nixos/
home.nix is also a placeholder.

.gitignore

@@ -1 +1,10 @@
 .claude
+docs/
+
+# secret guardrails — keep credentials out of the repo
+secrets/
+*.age
+*.key
+*.pem
+.env
+.env.*

README.md

@@ -0,0 +1,12 @@
+What's verified:
+  - nix flake check passes for both hivebrain and nikita-nixos
+  - nixos-rebuild dry-build --flake .#hivebrain succeeds (your config is unchanged in behavior)
+  - nixos-rebuild dry-build --flake .#nikita-nixos succeeds (Plasma 6 + SDDM derivation resolves)
+  - main is untouched
+
+  What's still TODO before you can install nikita-nixos:
+  - Replace hosts/nikita-nixos/hardware-configuration.nix (placeholder with PLACEHOLDER-ROOT label) with
+  the real output of nixos-generate-config --root /mnt on his machine.
+  - Replace the placeholder git identity in hosts/nikita-nixos/home.nix (currently Nikita /
+  nikita@example.com).
+  - Set Nikita's password with passwd after first boot — nothing is baked in.

config/nvim/.gitignore

@@ -0,0 +1,8 @@
+tt.*
+.tests
+doc/tags
+debug
+.repro
+foo.*
+*.log
+data

config/nvim/.neoconf.json

@@ -0,0 +1,15 @@
+{
+  "neodev": {
+    "library": {
+      "enabled": true,
+      "plugins": true
+    }
+  },
+  "neoconf": {
+    "plugins": {
+      "lua_ls": {
+        "enabled": true
+      }
+    }
+  }
+}

config/nvim/LICENSE

@@ -1,24 +0,0 @@
-This is free and unencumbered software released into the public domain.
-
-Anyone is free to copy, modify, publish, use, compile, sell, or
-distribute this software, either in source code form or as a compiled
-binary, for any purpose, commercial or non-commercial, and by any
-means.
-
-In jurisdictions that recognize copyright laws, the author or authors
-of this software dedicate any and all copyright interest in the
-software to the public domain. We make this dedication for the benefit
-of the public at large and to the detriment of our heirs and
-successors. We intend this dedication to be an overt act of
-relinquishment in perpetuity of all present and future rights to this
-software under copyright law.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
-OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-OTHER DEALINGS IN THE SOFTWARE.
-
-For more information, please refer to <https://unlicense.org>

config/nvim/README.md

@@ -1,9 +0,0 @@
-**This repo is supposed to be used as config by NvChad users!**
-
-- The main nvchad repo (NvChad/NvChad) is used as a plugin by this repo.
-- So you just import its modules , like `require "nvchad.options" , require "nvchad.mappings"`
-- So you can delete the .git from this repo ( when you clone it locally ) or fork it :)
-
-# Credits
-
-1) Lazyvim starter https://github.com/LazyVim/starter as nvchad's starter was inspired by Lazyvim's . It made a lot of things easier!

config/nvim/init.lua

@@ -1,37 +1,2 @@
-vim.g.base46_cache = vim.fn.stdpath "data" .. "/base46/"
-vim.g.mapleader = " "
-
--- bootstrap lazy and all plugins
-local lazypath = vim.fn.stdpath "data" .. "/lazy/lazy.nvim"
-
-if not vim.uv.fs_stat(lazypath) then
-  local repo = "https://github.com/folke/lazy.nvim.git"
-  vim.fn.system { "git", "clone", "--filter=blob:none", repo, "--branch=stable", lazypath }
-end
-
-vim.opt.rtp:prepend(lazypath)
-
-local lazy_config = require "configs.lazy"
-
--- load plugins
-require("lazy").setup({
-  {
-    "NvChad/NvChad",
-    lazy = false,
-    branch = "v2.5",
-    import = "nvchad.plugins",
-  },
-
-  { import = "plugins" },
-}, lazy_config)
-
--- load theme
-dofile(vim.g.base46_cache .. "defaults")
-dofile(vim.g.base46_cache .. "statusline")
-
-require "options"
-require "autocmds"
-
-vim.schedule(function()
-  require "mappings"
-end)
+-- bootstrap lazy.nvim, LazyVim and your plugins
+require("config.lazy")

config/nvim/lazy-lock.json

@@ -1,29 +1,43 @@
 {
-  "LuaSnip": { "branch": "master", "commit": "0abc8f390b278c3b4aabc4c004ac8a088b65cf24" },
-  "NvChad": { "branch": "v2.5", "commit": "d042cc975247c2aa55fcb228e5d146dc1dc6c648" },
-  "base46": { "branch": "v3.0", "commit": "884b990dcdbe07520a0892da6ba3e8d202b46337" },
+  "LazyVim": { "branch": "main", "commit": "459a4c3b1059671e766a46c7cc223827dc67e3d0" },
   "blink.cmp": { "branch": "main", "commit": "78336bc89ee5365633bcf754d93df01678b5c08f" },
+  "bufferline.nvim": { "branch": "main", "commit": "655133c3b4c3e5e05ec549b9f8cc2894ac6f51b3" },
+  "catppuccin": { "branch": "main", "commit": "e068ab5f8261f23f6f71ffd8791ae40315b77b9c" },
   "conform.nvim": { "branch": "master", "commit": "619363c30309d29ffa631e67c8183f2a72caa373" },
+  "crates.nvim": { "branch": "main", "commit": "694357861ec9ebf12475ddcdd04ea45a0923c32d" },
+  "flash.nvim": { "branch": "main", "commit": "fcea7ff883235d9024dc41e638f164a450c14ca2" },
   "friendly-snippets": { "branch": "main", "commit": "6cd7280adead7f586db6fccbd15d2cac7e2188b9" },
   "gitsigns.nvim": { "branch": "main", "commit": "2038c666bd9d8a0b7349a0b6ee00dc83104b9ecf" },
-  "indent-blankline.nvim": { "branch": "master", "commit": "d28a3f70721c79e3c5f6693057ae929f3d9c0a03" },
+  "grug-far.nvim": { "branch": "main", "commit": "c69859c1d5427ab5fc7ed12380ab521b4e336691" },
   "lazy.nvim": { "branch": "main", "commit": "85c7ff3711b730b4030d03144f6db6375044ae82" },
+  "lazydev.nvim": { "branch": "main", "commit": "ff2cbcba459b637ec3fd165a2be59b7bbaeedf0d" },
+  "lualine.nvim": { "branch": "master", "commit": "221ce6b2d999187044529f49da6554a92f740a96" },
+  "mason-lspconfig.nvim": { "branch": "main", "commit": "47059d71b42d74b0a1e9f61c1d99d301039c3b5b" },
+  "mason-nvim-dap.nvim": { "branch": "main", "commit": "9a10e096703966335bd5c46c8c875d5b0690dade" },
   "mason.nvim": { "branch": "main", "commit": "2a6940af80375532e5e9e7c1f2fc6319a1b7a69d" },
-  "menu": { "branch": "main", "commit": "7a0a4a2896b715c066cfbe320bdc048091874cc6" },
-  "minty": { "branch": "main", "commit": "aafc9e8e0afe6bf57580858a2849578d8d8db9e0" },
-  "nvim-autopairs": { "branch": "master", "commit": "7b9923abad60b903ece7c52940e1321d39eccc79" },
-  "nvim-cmp": { "branch": "main", "commit": "a1d504892f2bc56c2e79b65c6faded2fd21f3eca" },
+  "mini.ai": { "branch": "main", "commit": "cb20f298ebf5ae91924cd0c6c310712de2ef4086" },
+  "mini.icons": { "branch": "main", "commit": "e56797f90192d81f1fda02e662fc3e8e3d775027" },
+  "mini.pairs": { "branch": "main", "commit": "db0fac0a25884183650352ccf92b362a41ed2e9c" },
+  "noice.nvim": { "branch": "main", "commit": "7bfd942445fb63089b59f97ca487d605e715f155" },
+  "nui.nvim": { "branch": "main", "commit": "de740991c12411b663994b2860f1a4fd0937c130" },
   "nvim-dap": { "branch": "master", "commit": "9e848e09a697ee95302a3ef2dd43fd6eb709e570" },
   "nvim-dap-ui": { "branch": "master", "commit": "1a66cabaa4a4da0be107d5eda6d57242f0fe7e49" },
+  "nvim-dap-virtual-text": { "branch": "master", "commit": "fbdb48c2ed45f4a8293d0d483f7730d24467ccb6" },
+  "nvim-lint": { "branch": "master", "commit": "a219b2c9e5b4765e5c845aba119dad55806fcaf1" },
   "nvim-lspconfig": { "branch": "master", "commit": "3371bf298c1f56efc26771ee961f461176958fb5" },
   "nvim-nio": { "branch": "master", "commit": "21f5324bfac14e22ba26553caf69ec76ae8a7662" },
-  "nvim-tree.lua": { "branch": "master", "commit": "8e8be709c9a93e1ebefde7964884a8b564bfd3e0" },
   "nvim-treesitter": { "branch": "main", "commit": "4916d6592ede8c07973490d9322f187e07dfefac" },
-  "nvim-web-devicons": { "branch": "master", "commit": "dfbfaa967a6f7ec50789bead7ef87e336c1fa63c" },
+  "nvim-treesitter-textobjects": { "branch": "main", "commit": "851e865342e5a4cb1ae23d31caf6e991e1c99f1e" },
+  "nvim-ts-autotag": { "branch": "main", "commit": "88c1453db4ba7dd24131086fe51fdf74e587d275" },
+  "persistence.nvim": { "branch": "main", "commit": "b20b2a7887bd39c1a356980b45e03250f3dce49c" },
   "plenary.nvim": { "branch": "master", "commit": "74b06c6c75e4eeb3108ec01852001636d85a932b" },
+  "rose-pine": { "branch": "main", "commit": "ff483051a47e27d84bdef47703538df1ed9f4a47" },
   "rustaceanvim": { "branch": "main", "commit": "5a3a4158857ee1f7ec839b6ddd87cc0083a19c5f" },
-  "telescope.nvim": { "branch": "master", "commit": "427b576c16792edad01a92b89721d923c19ad60f" },
-  "ui": { "branch": "v3.0", "commit": "3e67e9d5325fd47fdbc90ca00a147db2f3525754" },
-  "volt": { "branch": "main", "commit": "620de1321f275ec9d80028c68d1b88b409c0c8b1" },
+  "snacks.nvim": { "branch": "main", "commit": "882c996cf28183f4d63640de0b4c02ec886d01f2" },
+  "todo-comments.nvim": { "branch": "main", "commit": "31e3c38ce9b29781e4422fc0322eb0a21f4e8668" },
+  "tokyonight.nvim": { "branch": "main", "commit": "cdc07ac78467a233fd62c493de29a17e0cf2b2b6" },
+  "trouble.nvim": { "branch": "main", "commit": "bd67efe408d4816e25e8491cc5ad4088e708a69a" },
+  "ts-comments.nvim": { "branch": "main", "commit": "a59d6092213447450191122c9346f309161504cb" },
+  "vim-tmux-navigator": { "branch": "master", "commit": "e41c431a0c7b7388ae7ba341f01a0d217eb3a432" },
   "which-key.nvim": { "branch": "main", "commit": "3aab2147e74890957785941f0c1ad87d0a44c15a" }
 }

config/nvim/lazyvim.json

@@ -0,0 +1,10 @@
+{
+  "extras": [
+
+  ],
+  "install_version": 8,
+  "news": {
+    "NEWS.md": "11866"
+  },
+  "version": 8
+}

config/nvim/lua/autocmds.lua

@@ -1 +0,0 @@
-require "nvchad.autocmds"

config/nvim/lua/chadrc.lua

@@ -1,24 +0,0 @@
--- This file needs to have same structure as nvconfig.lua 
--- https://github.com/NvChad/ui/blob/v3.0/lua/nvconfig.lua
--- Please read that file to know all available options :( 
-
----@type ChadrcConfig
-local M = {}
-
-M.base46 = {
-	theme = "rosepine",
-
-	-- hl_override = {
-	-- 	Comment = { italic = true },
-	-- 	["@comment"] = { italic = true },
-	-- },
-}
-
--- M.nvdash = { load_on_startup = true }
--- M.ui = {
---       tabufline = {
---          lazyload = false
---      }
--- }
-
-return M

config/nvim/lua/config/autocmds.lua

@@ -0,0 +1,2 @@
+-- Autocmds are automatically loaded on the VeryLazy event
+-- Default autocmds: https://github.com/LazyVim/LazyVim/blob/main/lua/lazyvim/config/autocmds.lua

config/nvim/lua/config/keymaps.lua

@@ -0,0 +1,22 @@
+-- Keymaps are automatically loaded on the VeryLazy event
+-- Default keymaps: https://github.com/LazyVim/LazyVim/blob/main/lua/lazyvim/config/keymaps.lua
+
+local map = vim.keymap.set
+
+map("n", ";", ":", { desc = "CMD enter command mode" })
+map("i", "jk", "<ESC>")
+
+-- DAP (override LazyVim defaults with previous muscle-memory bindings)
+map("n", "<Leader>dl", function() require("dap").step_into() end, { desc = "Debugger step into" })
+map("n", "<Leader>dj", function() require("dap").step_over() end, { desc = "Debugger step over" })
+map("n", "<Leader>dk", function() require("dap").step_out() end, { desc = "Debugger step out" })
+map("n", "<Leader>dc", function() require("dap").continue() end, { desc = "Debugger continue" })
+map("n", "<Leader>db", function() require("dap").toggle_breakpoint() end, { desc = "Debugger toggle breakpoint" })
+map("n", "<Leader>dd", function()
+  require("dap").set_breakpoint(vim.fn.input("Breakpoint condition: "))
+end, { desc = "Debugger conditional breakpoint" })
+map("n", "<Leader>de", function() require("dap").terminate() end, { desc = "Debugger terminate" })
+map("n", "<Leader>dr", function() require("dap").run_last() end, { desc = "Debugger run last" })
+
+-- rustaceanvim
+map("n", "<Leader>dt", "<cmd>RustLsp testables<CR>", { desc = "Rust testables" })

config/nvim/lua/config/lazy.lua

@@ -0,0 +1,41 @@
+local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
+if not (vim.uv or vim.loop).fs_stat(lazypath) then
+  local lazyrepo = "https://github.com/folke/lazy.nvim.git"
+  local out = vim.fn.system({ "git", "clone", "--filter=blob:none", "--branch=stable", lazyrepo, lazypath })
+  if vim.v.shell_error ~= 0 then
+    vim.api.nvim_echo({
+      { "Failed to clone lazy.nvim:\n", "ErrorMsg" },
+      { out, "WarningMsg" },
+      { "\nPress any key to exit..." },
+    }, true, {})
+    vim.fn.getchar()
+    os.exit(1)
+  end
+end
+vim.opt.rtp:prepend(lazypath)
+
+require("lazy").setup({
+  spec = {
+    { "LazyVim/LazyVim", import = "lazyvim.plugins" },
+    { import = "lazyvim.plugins.extras.dap.core" },
+    { import = "lazyvim.plugins.extras.lang.rust" },
+    { import = "plugins" },
+  },
+  defaults = {
+    lazy = false,
+    version = false,
+  },
+  install = { colorscheme = { "rose-pine", "tokyonight", "habamax" } },
+  checker = { enabled = true, notify = false },
+  performance = {
+    rtp = {
+      disabled_plugins = {
+        "gzip",
+        "tarPlugin",
+        "tohtml",
+        "tutor",
+        "zipPlugin",
+      },
+    },
+  },
+})

config/nvim/lua/config/options.lua

@@ -0,0 +1,2 @@
+-- Options are automatically loaded before lazy.nvim startup
+-- Default options: https://github.com/LazyVim/LazyVim/blob/main/lua/lazyvim/config/options.lua

config/nvim/lua/configs/conform.lua

@@ -1,15 +0,0 @@
-local options = {
-  formatters_by_ft = {
-    lua = { "stylua" },
-    -- css = { "prettier" },
-    -- html = { "prettier" },
-  },
-
-  -- format_on_save = {
-  --   -- These options will be passed to conform.format()
-  --   timeout_ms = 500,
-  --   lsp_fallback = true,
-  -- },
-}
-
-return options

config/nvim/lua/configs/lazy.lua

@@ -1,47 +0,0 @@
-return {
-  defaults = { lazy = true },
-  install = { colorscheme = { "nvchad" } },
-
-  ui = {
-    icons = {
-      ft = "",
-      lazy = "󰂠 ",
-      loaded = "",
-      not_loaded = "",
-    },
-  },
-
-  performance = {
-    rtp = {
-      disabled_plugins = {
-        "2html_plugin",
-        "tohtml",
-        "getscript",
-        "getscriptPlugin",
-        "gzip",
-        "logipat",
-        "netrw",
-        "netrwPlugin",
-        "netrwSettings",
-        "netrwFileHandlers",
-        "matchit",
-        "tar",
-        "tarPlugin",
-        "rrhelper",
-        "spellfile_plugin",
-        "vimball",
-        "vimballPlugin",
-        "zip",
-        "zipPlugin",
-        "tutor",
-        "rplugin",
-        "syntax",
-        "synmenu",
-        "optwin",
-        "compiler",
-        "bugreport",
-        "ftplugin",
-      },
-    },
-  },
-}

config/nvim/lua/configs/lspconfig.lua

@@ -1,6 +0,0 @@
-require("nvchad.configs.lspconfig").defaults()
-
-local servers = { "html", "cssls" }
-vim.lsp.enable(servers)
-
--- read :h vim.lsp.config for changing options of lsp servers 

config/nvim/lua/mappings.lua

@@ -1,28 +0,0 @@
-require "nvchad.mappings"
-
--- add yours here
-
-local map = vim.keymap.set
-
-map("n", ";", ":", { desc = "CMD enter command mode" })
-map("i", "jk", "<ESC>")
-
--- map({ "n", "i", "v" }, "<C-s>", "<cmd> w <cr>")
-
--- Nvim DAP
-map("n", "<Leader>dl", "<cmd>lua require'dap'.step_into()<CR>", { desc = "Debugger step into" })
-map("n", "<Leader>dj", "<cmd>lua require'dap'.step_over()<CR>", { desc = "Debugger step over" })
-map("n", "<Leader>dk", "<cmd>lua require'dap'.step_out()<CR>", { desc = "Debugger step out" })
-map("n", "<Leader>dc", "<cmd>lua require'dap'.continue()<CR>", { desc = "Debugger continue" })
-map("n", "<Leader>db", "<cmd>lua require'dap'.toggle_breakpoint()<CR>", { desc = "Debugger toggle breakpoint" })
-map(
-	"n",
-	"<Leader>dd",
-	"<cmd>lua require'dap'.set_breakpoint(vim.fn.input('Breakpoint condition: '))<CR>",
-	{ desc = "Debugger set conditional breakpoint" }
-)
-map("n", "<Leader>de", "<cmd>lua require'dap'.terminate()<CR>", { desc = "Debugger reset" })
-map("n", "<Leader>dr", "<cmd>lua require'dap'.run_last()<CR>", { desc = "Debugger run last" })
-
--- rustaceanvim
-map("n", "<Leader>dt", "<cmd>lua vim.cmd('RustLsp testables')<CR>", { desc = "Debugger testables" })

config/nvim/lua/options.lua

@@ -1,6 +0,0 @@
-require "nvchad.options"
-
--- add yours here!
-
--- local o = vim.o
--- o.cursorlineopt ='both' -- to enable cursorline!

config/nvim/lua/plugins/colorscheme.lua

@@ -0,0 +1,8 @@
+return {
+  { "rose-pine/neovim", name = "rose-pine", lazy = false, priority = 1000 },
+
+  {
+    "LazyVim/LazyVim",
+    opts = { colorscheme = "rose-pine" },
+  },
+}

config/nvim/lua/plugins/init.lua

@@ -1,83 +0,0 @@
-return {
-  {
-    "stevearc/conform.nvim",
-    -- event = 'BufWritePre', -- uncomment for format on save
-    opts = require "configs.conform",
-  },
-
-  -- These are some examples, uncomment them if you want to see them work!
-  {
-    "neovim/nvim-lspconfig",
-    config = function()
-      require "configs.lspconfig"
-    end,
-  },
-
-  {
-    'mrcjkb/rustaceanvim',
-    -- To avoid being surprised by breaking changes,
-    -- I recommend you set a version range
-    version = '^9',
-    -- This plugin implements proper lazy-loading (see :h lua-plugin-lazy).
-    -- No need for lazy.nvim to lazy-load it.
-    lazy = false,
-    config = function()
-      local mason_registry = require('mason-registry')
-      local codelldb = mason_registry.get_package('codelldb')
-      local extension_path = codelldb:get_install_path() .. "/extension/"
-      local codelldb_path = extension_path .. "adapter/codelldb"
-      local liblldb_ext = vim.uv.os_uname().sysname == "Darwin" and "dylib" or "so"
-      local liblldb_path = extension_path .. "lldb/lib/liblldb." .. liblldb_ext
-      local cfg = require('rustaceanvim.config')
-
-      vim.g.rustaceanvim = {
-        dap = {
-          adapter = cfg.get_codelldb_adapter(codelldb_path, liblldb_path),
-        },
-      }
-    end
-  },
-
-  { 
-    'mfussenegger/nvim-dap', 
-    config = function()
-      local dap, dapui = require('dap'), require('dapui') 
-      
-      dap.listeners.before.attach.dapui_config = function()
-        dapui.open()
-      end
-      
-      dap.listeners.before.launch.dapui_config = function()
-        dapui.open()
-      end
-
-      dap.listeners.before.event_terminated.dapui_config = function()
-        dapui.close()
-      end
-
-      dap.listeners.before.event_exited.dapui_config = function()
-        dapui.close()
-      end
-    end
-  },
-
-  {
-    'rcarriga/nvim-dap-ui',
-    dependencies = { 'mfussenegger/nvim-dap', 'nvim-neotest/nvim-nio' },
-    config = function()
-      require('dapui').setup()
-    end,
-  },
-
-  { import = "nvchad.blink.lazyspec" },
-
-  {
-  	"nvim-treesitter/nvim-treesitter",
-  	opts = {
-  		ensure_installed = {
-  			"vim", "lua", "vimdoc",
-       "html", "css"
-  		},
-  	},
-  },
-}

config/nvim/lua/plugins/tmux-navigator.lua

@@ -0,0 +1,13 @@
+return {
+  {
+    "christoomey/vim-tmux-navigator",
+    lazy = false,
+    cmd = {
+      "TmuxNavigateLeft",
+      "TmuxNavigateDown",
+      "TmuxNavigateUp",
+      "TmuxNavigateRight",
+      "TmuxNavigatePrevious",
+    },
+  },
+}

configuration.nix

@@ -1,21 +0,0 @@
-{ ... }:
-
-{
-  imports = [
-    ./hardware-configuration.nix
-    ./system/boot.nix
-    ./system/networking.nix
-    ./system/locale.nix
-    ./system/xserver.nix
-    ./system/picom.nix
-    ./system/display-manager.nix
-    ./system/fonts.nix
-    ./system/users.nix
-    ./system/programs.nix
-    ./system/packages.nix
-    ./system/ssh.nix
-    ./system/nix.nix
-  ];
-
-  system.stateVersion = "26.05";
-}

flake.nix

@@ -9,20 +9,32 @@
 		};
 	};
 
-	outputs = { self, nixpkgs, home-manager, ... }: {
-		nixosConfigurations.hivebrain = nixpkgs.lib.nixosSystem {
+	outputs = { self, nixpkgs, home-manager, ... }:
+	let
+		mkHost = { hostPath, username, homePath }: nixpkgs.lib.nixosSystem {
 			system = "x86_64-linux";
 			modules = [
-				./configuration.nix
+				hostPath
 				home-manager.nixosModules.home-manager {
 					home-manager = {
 						useGlobalPkgs = true;
 						useUserPackages = true;
-						users.marvin = import ./home.nix;
+						users.${username} = import homePath;
 						backupFileExtension = "backup";
 					};
 				}
 			];
 		};
+	in {
+		nixosConfigurations.hivebrain = mkHost {
+			hostPath = ./hosts/hivebrain;
+			username = "marvin";
+			homePath = ./hosts/hivebrain/home.nix;
+		};
+		nixosConfigurations.nikita-nixos = mkHost {
+			hostPath = ./hosts/nikita-nixos;
+			username = "nikita";
+			homePath = ./hosts/nikita-nixos/home.nix;
+		};
 	};
 }

home.nix

@@ -1,17 +0,0 @@
-{ ... }:
-
-{
-  imports = [
-    ./home/zsh.nix
-    ./home/git.nix
-    ./home/rofi.nix
-    ./home/yazi.nix
-    ./home/packages.nix
-    ./home/symlinks.nix
-    ./home/fonts.nix
-  ];
-
-  home.username = "marvin";
-  home.homeDirectory = "/home/marvin";
-  home.stateVersion = "26.05";
-}

home/blender.nix

@@ -0,0 +1,5 @@
+{ pkgs, ... }:
+
+{
+  home.packages = [ pkgs.blender ];
+}

home/git.nix

@@ -1,11 +0,0 @@
-{ ... }:
-
-{
-  programs.git = {
-    enable = true;
-    settings.user = {
-      name = "MDietermann";
-      email = "marvin.dietermann@hive-brain.de";
-    };
-  };
-}

home/packages-base.nix

@@ -0,0 +1,10 @@
+{ pkgs, ... }:
+
+{
+  home.packages = with pkgs; [
+    neovim
+    nerd-fonts.jetbrains-mono
+    ripgrep
+    unzip
+  ];
+}

home/packages-marvin.nix

@@ -4,19 +4,20 @@
   home.packages = with pkgs; [
     alacritty
     claude-code
+    fd
+    fzf
     gcc
+    lazygit
     lua-language-server
-    neovim
-    nerd-fonts.jetbrains-mono
     nil
     nixpkgs-fmt
     nodejs
     obsidian
     pkg-config
-    ripgrep
     rustup
     steam
-    unzip
+    vesktop
+    xclip
     xwallpaper
   ];
 }

home/tmux.nix

@@ -0,0 +1,51 @@
+{ pkgs, ... }:
+
+{
+  programs.tmux = {
+    enable = true;
+    prefix = "C-Space";
+    keyMode = "vi";
+    mouse = true;
+    escapeTime = 10;
+    terminal = "tmux-256color";
+    historyLimit = 50000;
+    baseIndex = 1;
+    plugins = with pkgs.tmuxPlugins; [
+      vim-tmux-navigator
+      resurrect
+      {
+        plugin = continuum;
+        extraConfig = ''
+          set -g @continuum-restore 'on'
+          set -g @continuum-save-interval '15'
+        '';
+      }
+    ];
+    extraConfig = ''
+      # True-color + undercurl passthrough for nvim LSP underlines
+      set -ga terminal-overrides ',*256col*:Tc'
+      set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm'
+      set -as terminal-overrides ',*:Setulc=\E[58::2::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'
+
+      set -g renumber-windows on
+      setw -g pane-base-index 1
+
+      # Splits open in pane's CWD
+      bind | split-window -h -c "#{pane_current_path}"
+      bind - split-window -v -c "#{pane_current_path}"
+      unbind '"'
+      unbind %
+      bind c new-window -c "#{pane_current_path}"
+
+      # Reload config
+      bind r source-file ~/.config/tmux/tmux.conf \; display "reloaded"
+
+      # Vi copy-mode: v select, y yank to X11 clipboard
+      bind-key -T copy-mode-vi v send -X begin-selection
+      bind-key -T copy-mode-vi y send -X copy-pipe-and-cancel 'xclip -selection clipboard -i'
+
+      # Default layout on new session: main + right pane (~20%) + bottom pane (~15%)
+      set-hook -g session-created 'split-window -h -l 20% -c "#{pane_current_path}" ; select-pane -t 0 ; split-window -v -l 15% -c "#{pane_current_path}" ; select-pane -t 0'
+    '';
+  };
+}

home/zsh.nix

@@ -19,7 +19,7 @@
 
     shellAliases = {
       btw = "echo I use NixOS";
-      reload-nixos = "sudo nixos-rebuild switch --flake ~/nixos-dotfiles#hivebrain";
+      reload-nixos = "sudo nixos-rebuild switch --flake ~/nixos-dotfiles";
     };
   };
 }

hosts/hivebrain/default.nix

@@ -0,0 +1,26 @@
+{ ... }:
+
+{
+  imports = [
+    ./hardware-configuration.nix
+
+    # shared
+    ../../system/boot.nix
+    ../../system/networking.nix
+    ../../system/locale.nix
+    ../../system/fonts.nix
+    ../../system/nix.nix
+    ../../system/ssh.nix
+    ../../system/programs.nix
+    ../../system/packages.nix
+
+    # marvin-only
+    ../../system/xserver.nix
+    ../../system/picom.nix
+    ../../system/display-managers/ly.nix
+    ../../system/users/marvin.nix
+  ];
+
+  networking.hostName = "hivebrain";
+  system.stateVersion = "26.05";
+}

hosts/hivebrain/home.nix

@@ -0,0 +1,27 @@
+{ ... }:
+
+{
+  imports = [
+    ../../home/zsh.nix
+    ../../home/fonts.nix
+    ../../home/rofi.nix
+    ../../home/yazi.nix
+    ../../home/symlinks.nix
+    ../../home/packages-base.nix
+    ../../home/packages-marvin.nix
+    ../../home/tmux.nix
+    ../../home/blender.nix
+  ];
+
+  home.username = "marvin";
+  home.homeDirectory = "/home/marvin";
+  home.stateVersion = "26.05";
+
+  programs.git = {
+    enable = true;
+    settings.user = {
+      name = "MDietermann";
+      email = "marvin.dietermann@hive-brain.de";
+    };
+  };
+}

hosts/nikita-nixos/default.nix

@@ -0,0 +1,24 @@
+{ ... }:
+
+{
+  imports = [
+    ./hardware-configuration.nix
+
+    # shared
+    ../../system/boot.nix
+    ../../system/networking.nix
+    ../../system/locale.nix
+    ../../system/fonts.nix
+    ../../system/nix.nix
+    ../../system/programs.nix
+    ../../system/packages.nix
+
+    # nikita-only
+    ../../system/plasma.nix
+    ../../system/display-managers/sddm.nix
+    ../../system/users/nikita.nix
+  ];
+
+  networking.hostName = "nikita-nixos";
+  system.stateVersion = "26.05";
+}

hosts/nikita-nixos/hardware-configuration.nix

@@ -0,0 +1,24 @@
+{ lib, modulesPath, ... }:
+
+# Placeholder hardware-configuration. Replace with the file generated on
+# Nikita's actual machine via `nixos-generate-config --root /mnt` before
+# building or installing.
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  boot.initrd.availableKernelModules = [ ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-label/PLACEHOLDER-ROOT";
+    fsType = "ext4";
+  };
+
+  swapDevices = [ ];
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+}

hosts/nikita-nixos/home.nix

@@ -0,0 +1,25 @@
+{ ... }:
+
+{
+  imports = [
+    ../../home/zsh.nix
+    ../../home/fonts.nix
+    ../../home/yazi.nix
+    ../../home/symlinks.nix
+    ../../home/packages-base.nix
+    ../../home/blender.nix
+  ];
+
+  home.username = "nikita";
+  home.homeDirectory = "/home/nikita";
+  home.stateVersion = "26.05";
+
+  # TODO: replace with Nikita's actual git identity before first use
+  programs.git = {
+    enable = true;
+    settings.user = {
+      name = "Nikita";
+      email = "nikita@example.com";
+    };
+  };
+}

system/display-managers/sddm.nix

@@ -0,0 +1,5 @@
+{ ... }:
+
+{
+  services.displayManager.sddm.enable = true;
+}

system/networking.nix

@@ -1,6 +1,5 @@
 { ... }:
 
 {
-  networking.hostName = "hivebrain";
   networking.networkmanager.enable = true;
 }

system/plasma.nix

@@ -0,0 +1,5 @@
+{ ... }:
+
+{
+  services.desktopManager.plasma6.enable = true;
+}

system/users/nikita.nix

@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+
+{
+  users.users.nikita = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" "networkmanager" ];
+    shell = pkgs.zsh;
+    packages = with pkgs; [
+      tree
+    ];
+  };
+}