Fix #14: better active window detection

plugin/hardline.vim

@@ -7,3 +7,17 @@ if exists('g:loaded_hardline')
 endif
 
 let g:loaded_hardline = 1
+
+function! ActiveLine()
+  return luaeval('require("hardline").update_statusline(true)')
+endfunction
+
+function! InactiveLine()
+  return luaeval('require("hardline").update_statusline(false)')
+endfunction
+
+augroup hardline
+  autocmd!
+  autocmd WinEnter,BufEnter * setlocal statusline=%!ActiveLine()
+  autocmd WinLeave,BufLeave * setlocal statusline=%!InactiveLine()
+augroup END