From 4af5cf9a8a1883b9f21f5a88309cb941fad8ab88 Mon Sep 17 00:00:00 2001
From: mathew <glephunter@gmail.com>
Date: Fri, 18 Aug 2023 20:47:50 +0800
Subject: [PATCH] check modified before format avoid trigger many times

---
 lua/guard/format.lua | 5 ++++-
 plugin/guard.lua     | 4 ++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/lua/guard/format.lua b/lua/guard/format.lua
index 142c88b..caa04c2 100644
--- a/lua/guard/format.lua
+++ b/lua/guard/format.lua
@@ -172,10 +172,13 @@ local function do_fmt(buf)
 end
 
 local function attach_to_buf(buf)
-  api.nvim_create_autocmd('BufWritePost', {
+  api.nvim_create_autocmd('BufWritePre', {
     group = 'Guard',
     buffer = buf,
     callback = function(opt)
+      if not vim.bo[opt.buf].modified then
+        return
+      end
       require('guard.format').do_fmt(opt.buf)
     end,
   })
diff --git a/plugin/guard.lua b/plugin/guard.lua
index 5be752a..02c1fca 100644
--- a/plugin/guard.lua
+++ b/plugin/guard.lua
@@ -9,7 +9,7 @@ vim.api.nvim_create_user_command('GuardDisable', function(opts)
   local arg = opts.args
   local bufnr = (#opts.fargs == 0) and api.nvim_get_current_buf() or tonumber(arg)
   if bufnr then
-    local bufau = api.nvim_get_autocmds({ group = 'Guard', event = 'BufWritePost', buffer = bufnr })
+    local bufau = api.nvim_get_autocmds({ group = 'Guard', event = 'BufWritePre', buffer = bufnr })
     if #bufau ~= 0 then
       api.nvim_del_autocmd(bufau[1].id)
     end
@@ -19,7 +19,7 @@ vim.api.nvim_create_user_command('GuardEnable', function(opts)
   local arg = opts.args
   local bufnr = (#opts.fargs == 0) and api.nvim_get_current_buf() or tonumber(arg)
   if bufnr then
-    local bufau = api.nvim_get_autocmds({ group = 'Guard', event = 'BufWritePost', buffer = bufnr })
+    local bufau = api.nvim_get_autocmds({ group = 'Guard', event = 'BufWritePre', buffer = bufnr })
     if #bufau == 0 then
       require('guard.format').attach_to_buf(bufnr)
     end