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tools/nvim: implement cross-platform automatic theme switching
Replace vim-lumen with custom solution that automatically switches between
ayu (dark) and everforest (light) colorschemes based on system theme.
- macOS: uses defaults read -g AppleInterfaceStyle
- Linux: checks gsettings, kreadconfig5, and COLORFGBG
- Polls every 3 seconds for theme changes
- Provides :RefreshTheme command for manual switching
author
lassulus
date
(Jul 1, 2025, 12:28 PM CEST)
commit
9d3eef9d
9d3eef9d972a741ccdd0b74f67d5d6449f294b90
parent
8313bf40
8313bf407d3a7a40656b90d25ede347edd93f174
+78
-29
+78
-29
tools/nvim/flake-module.nix
+78
-29
tools/nvim/flake-module.nix
···
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colorschemes = {
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ayu = {
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enable = true;
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settings = {
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mirage = false;
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dark = true;
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};
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settings.overrides = {
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EoLSpace = {
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bg = "#883333";
···
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};
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};
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};
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extraConfigLua = ''
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-- Cross-platform background detection and colorscheme switching
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local last_theme = nil
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local function detect_and_set_theme()
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local is_dark = false
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if vim.fn.has("mac") == 1 then
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-- macOS: check system appearance
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local result = vim.fn.system("defaults read -g AppleInterfaceStyle 2>/dev/null")
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is_dark = result:match("Dark") ~= nil
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elseif vim.fn.has("unix") == 1 then
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-- Linux: check if running under a dark theme
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-- Try multiple methods to detect dark theme
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local methods = {
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-- GNOME/GTK
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"gsettings get org.gnome.desktop.interface gtk-theme 2>/dev/null",
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"gsettings get org.gnome.desktop.interface color-scheme 2>/dev/null",
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-- KDE
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"kreadconfig5 --file kdeglobals --group General --key ColorScheme 2>/dev/null",
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-- Check if COLORFGBG suggests dark background
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function()
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local colorfgbg = vim.env.COLORFGBG
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if colorfgbg then
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local fg, bg = colorfgbg:match("(%d+);(%d+)")
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if fg and bg then
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-- If foreground is lighter than background, likely dark theme
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return tonumber(fg) > tonumber(bg)
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end
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end
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return false
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end
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}
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for _, method in ipairs(methods) do
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if type(method) == "function" then
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is_dark = method()
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if is_dark then break end
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else
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local result = vim.fn.system(method)
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if result:match("[Dd]ark") or result:match("prefer%-dark") then
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is_dark = true
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break
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end
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end
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end
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end
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local new_theme = is_dark and "dark" or "light"
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if new_theme ~= last_theme then
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last_theme = new_theme
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vim.o.background = new_theme
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if is_dark then
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vim.cmd("colorscheme ayu")
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print("Switched to dark theme (ayu)")
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else
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vim.cmd("colorscheme everforest")
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print("Switched to light theme (everforest)")
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end
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end
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end
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-- Set initial theme
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vim.defer_fn(detect_and_set_theme, 100)
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-- Check for theme changes every 3 seconds (less frequent to be less resource intensive)
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local timer = vim.loop.new_timer()
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timer:start(3000, 3000, vim.schedule_wrap(detect_and_set_theme))
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-- Create a command to manually refresh theme
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vim.api.nvim_create_user_command("RefreshTheme", detect_and_set_theme, {})
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'';
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globals = {
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mapleader = " ";
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lumen_light_colorscheme = "everforest";
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lumen_dark_colorscheme = "ayu";
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};
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opts = {
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mouse = "a";
···
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" need to use lua to expand $HOME
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lua vim.o.undodir = vim.fs.normalize('$HOME/.vim/undodir')
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'';
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extraPackages = [
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pkgs.glib # for vim-lumen
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];
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extraPlugins = [
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pkgs.vimPlugins.vim-fetch
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(pkgs.vimUtils.buildVimPlugin {
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name = "vim-lumen";
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src = pkgs.fetchFromGitHub {
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owner = "vimpostor";
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repo = "vim-lumen";
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rev = "ac13c32c3e309f6c6a84ff6cad8dbb135e75f0e4";
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hash = "sha256-rsDUDI9lh4CEX1upMBjeyBOm99GAXWGPQ9vSCN8cmFo=";
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};
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})
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];
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# not ready yet, we are waiting for none-ls to get updated
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# extraConfigLua = ''
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# local null_ls = require("null-ls")
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# null_ls.register(null_ls.builtins.formatting.nix_flake_fmt)
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# '';
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keymaps = [
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{
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mode = "i";
···
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mode = "n";
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key = "<Space>";
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action = "<Nop>";
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}
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{
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mode = "n";
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key = "<leader>sd";
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action = ":colorscheme ayu-dark<cr>";
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}
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{
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mode = "n";
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key = "<leader>sw";
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action = ":colorscheme ayu-light<cr>";
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}
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{
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mode = [