From 253281ae5e94be780e52ac1f5b4d33a6d912f38f Mon Sep 17 00:00:00 2001
From: Zachary Yedidia <zyedidia@gmail.com>
Date: Sun, 28 Jun 2020 16:29:32 -0400
Subject: [PATCH] Add a lock for plugins to use if using async code

Ref #1539
---
 cmd/micro/initlua.go | 1 +
 cmd/micro/micro.go   | 3 +++
 internal/lua/lua.go  | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/cmd/micro/initlua.go b/cmd/micro/initlua.go
index a6d566fc..8b1dca82 100644
--- a/cmd/micro/initlua.go
+++ b/cmd/micro/initlua.go
@@ -56,6 +56,7 @@ func luaImportMicro() *lua.LTable {
 	ulua.L.SetField(pkg, "Tabs", luar.New(ulua.L, func() *action.TabList {
 		return action.Tabs
 	}))
+	ulua.L.SetField(pkg, "Lock", luar.New(ulua.L, ulua.Lock))
 
 	return pkg
 }
diff --git a/cmd/micro/micro.go b/cmd/micro/micro.go
index 62b3290c..83b09daa 100644
--- a/cmd/micro/micro.go
+++ b/cmd/micro/micro.go
@@ -17,6 +17,7 @@ import (
 	"github.com/zyedidia/micro/v2/internal/action"
 	"github.com/zyedidia/micro/v2/internal/buffer"
 	"github.com/zyedidia/micro/v2/internal/config"
+	ulua "github.com/zyedidia/micro/v2/internal/lua"
 	"github.com/zyedidia/micro/v2/internal/screen"
 	"github.com/zyedidia/micro/v2/internal/shell"
 	"github.com/zyedidia/micro/v2/internal/util"
@@ -344,7 +345,9 @@ func main() {
 	// okay to be inefficient and run it via a function every time
 	// We do this so we can recover from panics without crashing the editor
 	for {
+		ulua.Lock.Lock()
 		DoEvent()
+		ulua.Lock.Unlock()
 	}
 }
 
diff --git a/internal/lua/lua.go b/internal/lua/lua.go
index 83b58cd8..644795a6 100644
--- a/internal/lua/lua.go
+++ b/internal/lua/lua.go
@@ -15,6 +15,7 @@ import (
 	"regexp"
 	"runtime"
 	"strings"
+	"sync"
 	"time"
 	"unicode/utf8"
 
@@ -24,6 +25,7 @@ import (
 )
 
 var L *lua.LState
+var Lock sync.Mutex
 
 // LoadFile loads a lua file
 func LoadFile(module string, file string, data []byte) error {