auto dark/light theme (from darkman)

lua/theme-sync.lua

@@ -0,0 +1,61 @@
+-- Sync Neovim theme with system (darkman)
+
+local M = {}
+
+-- Theme mappings
+M.themes = {
+  light = "onenord_light",
+  dark = "onenord",        -- Change to your preferred dark theme
+}
+
+-- Get current system theme from darkman
+function M.get_system_mode()
+  local handle = io.popen("darkman get 2>/dev/null")
+  if handle then
+    local result = handle:read("*a")
+    handle:close()
+    result = result and result:gsub("%s+$", "") or nil
+    if result == "light" then
+      return "light"
+    end
+  end
+  return "dark"
+end
+
+-- Apply theme based on mode (mirrors NvChad's toggle_theme logic)
+function M.apply_theme(mode)
+  local theme = M.themes[mode] or M.themes.dark
+  local opts = require("nvconfig").base46
+
+  -- Update in-memory config so base46.compile() picks up the new theme
+  opts.theme = theme
+
+  -- Bust chadrc cache, read old theme from file, then replace it
+  package.loaded.chadrc = nil
+  local old_theme = require("chadrc").base46.theme
+  require("nvchad.utils").replace_word('theme = "' .. old_theme, 'theme = "' .. theme)
+
+  require("base46").load_all_highlights()
+end
+
+-- Sync with system theme
+function M.sync()
+  local mode = M.get_system_mode()
+  M.apply_theme(mode)
+end
+
+-- Watch for theme changes (checks periodically)
+function M.watch()
+  local timer = vim.loop.new_timer()
+  local last_mode = M.get_system_mode()
+
+  timer:start(0, 5000, vim.schedule_wrap(function()
+    local current_mode = M.get_system_mode()
+    if current_mode ~= last_mode then
+      M.apply_theme(current_mode)
+      last_mode = current_mode
+    end
+  end))
+end
+
+return M