fix: multiple au attached to one buf (#117)

* initial commit

* fix: dup au

Author: xiaoshihou514

lua/guard/events.lua

@@ -8,7 +8,15 @@ local function watch_ft(fts)
     group = group,
     pattern = fts,
     callback = function(args)
-      format.attach_to_buf(args.buf)
+      if
+        #api.nvim_get_autocmds({
+          group = group,
+          event = 'BufWritePre',
+          buffer = args.buf,
+        }) == 0
+      then
+        format.attach_to_buf(args.buf)
+      end
     end,
     desc = 'guard',
   })

lua/guard/format.lua

@@ -211,11 +211,11 @@ local function attach_to_buf(buf)
   api.nvim_create_autocmd('BufWritePre', {
     group = require('guard.events').group,
     buffer = buf,
-    callback = function(opt)
-      if not vim.bo[opt.buf].modified then
+    callback = function()
+      if not vim.bo[buf].modified then
         return
       end
-      require('guard.format').do_fmt(opt.buf)
+      require('guard.format').do_fmt(buf)
     end,
   })
 end