Match background with system appearance on Windows

On start-up only

Author: raindev

lua/daybreak.lua

@@ -1,11 +1,14 @@
 local gdbus = require('gdbus')
 local macos = require('macos')
+local windows = require('windows')
 
 local M = {}
 
 function M.setup(_)
   if vim.fn.has('osx') == 1 then
     macos.setup()
+  elseif vim.fn.has('win32') == 1 or vim.fn.has('win64') == 1 then
+    windows.setup()
   elseif vim.fn.executable('gdbus') == 1 then
     gdbus.setup()
   end

lua/windows.lua

@@ -0,0 +1,26 @@
+local M = {}
+
+function M.setup()
+  local reg_cmd = 'reg query'
+      .. ' HKCU\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize'
+      .. ' /v AppsUseLightTheme'
+  local reg_stdout = io.popen(reg_cmd)
+  if reg_stdout == nil then
+    print('can\'t execute reg')
+    return
+  end
+  local stdout_str = reg_stdout:read('*a')
+  local exit_success = reg_stdout:close()
+  if exit_success ~= true then
+    print('reg command failed')
+    return
+  end
+  local value = stdout_str:match('AppsUseLightTheme%s+REG_DWORD%s+0x(%d+)')
+  if value == nil then
+    print('unrecognized registry value')
+    return
+  end
+  vim.opt.background = value == '1' and 'light' or 'dark'
+end
+
+return M

readme.md

@@ -17,5 +17,5 @@ Using any other plugin manager add `raindev/daybreak.nvim` and load the plugin w
    - [ ] macOS
    - [ ] windows
 2. Event based, no polling.
-3. Support Linux, macOS and Windows (planned).
+3. Support Linux, macOS and Windows.
 4. Zero configuration.