Switch to lua

plugin/hflip.lua

@@ -0,0 +1,5 @@
+if not vim.g.hflip then
+    local hflip = require('hflip')
+    vim.api.nvim_create_user_command('HFlip', hflip.hflip, {})
+    vim.g.hflip = true
+end

plugin/hflip.vim

@@ -1,13 +0,0 @@
-" in plugin/hflip.vim
-if exists('g:loaded_hflip') | finish | endif " prevent loading file twice
-
-let s:save_cpo = &cpo " save user coptions
-set cpo&vim " reset them to defaults
-
-" command to run our plugin
-command! HFlip lua require'hflip'.hflip()
-
-let &cpo = s:save_cpo " and restore after
-unlet s:save_cpo
-
-let g:loaded_hflip = 1