From b3e40a26440f3ec5674bf5d17989269ceed61936 Mon Sep 17 00:00:00 2001
From: Zachary Yedidia <zyedidia@gmail.com>
Date: Wed, 15 Jan 2020 22:25:08 -0500
Subject: [PATCH] Make debug mode flag, plugins can access logbuf

---
 cmd/micro/initlua.go      |  2 ++
 cmd/micro/micro.go        | 11 +++++++++--
 internal/buffer/buffer.go |  5 +++++
 runtime/help/plugins.md   |  2 ++
 4 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/cmd/micro/initlua.go b/cmd/micro/initlua.go
index 6363ddf3..0c6d113d 100644
--- a/cmd/micro/initlua.go
+++ b/cmd/micro/initlua.go
@@ -117,6 +117,8 @@ func luaImportMicroBuffer() *lua.LTable {
 		return buffer.NewBufferFromFile(path, buffer.BTDefault)
 	}))
 	ulua.L.SetField(pkg, "ByteOffset", luar.New(ulua.L, buffer.ByteOffset))
+	ulua.L.SetField(pkg, "Log", luar.New(ulua.L, buffer.WriteLog))
+	ulua.L.SetField(pkg, "LogBuf", luar.New(ulua.L, buffer.GetLogBuf))
 
 	return pkg
 }
diff --git a/cmd/micro/micro.go b/cmd/micro/micro.go
index 3be216e7..3e2f95fa 100644
--- a/cmd/micro/micro.go
+++ b/cmd/micro/micro.go
@@ -28,6 +28,7 @@ var (
 	flagVersion   = flag.Bool("version", false, "Show the version number and information")
 	flagConfigDir = flag.String("config-dir", "", "Specify a custom location for the configuration directory")
 	flagOptions   = flag.Bool("options", false, "Show all option help")
+	flagDebug     = flag.Bool("debug", false, "Enable debug mode (prints debug info to ./log.txt)")
 	optionFlags   map[string]*string
 )
 
@@ -41,6 +42,8 @@ func InitFlags() {
 		fmt.Println("    \tThis can also be done by opening file:LINE:COL")
 		fmt.Println("-options")
 		fmt.Println("    \tShow all option help")
+		fmt.Println("-debug")
+		fmt.Println("    \tEnable debug mode (enables logging to ./log.txt)")
 		fmt.Println("-version")
 		fmt.Println("    \tShow the version number and information")
 
@@ -82,6 +85,10 @@ func InitFlags() {
 		}
 		os.Exit(0)
 	}
+
+	if util.Debug == "OFF" && *flagDebug {
+		util.Debug = "ON"
+	}
 }
 
 // LoadInput determines which files should be loaded into buffers
@@ -144,10 +151,10 @@ func main() {
 
 	var err error
 
-	InitLog()
-
 	InitFlags()
 
+	InitLog()
+
 	err = config.InitConfigDir(*flagConfigDir)
 	if err != nil {
 		screen.TermMessage(err)
diff --git a/internal/buffer/buffer.go b/internal/buffer/buffer.go
index 6535b87f..296f6bf7 100644
--- a/internal/buffer/buffer.go
+++ b/internal/buffer/buffer.go
@@ -879,3 +879,8 @@ func (b *Buffer) Line(i int) string {
 func WriteLog(s string) {
 	LogBuf.EventHandler.Insert(LogBuf.End(), s)
 }
+
+// GetLogBuf returns the log buffer
+func GetLogBuf() *Buffer {
+	return LogBuf
+}
diff --git a/runtime/help/plugins.md b/runtime/help/plugins.md
index e68df426..6c431068 100644
--- a/runtime/help/plugins.md
+++ b/runtime/help/plugins.md
@@ -178,6 +178,8 @@ The packages and functions are listed below (in Go type signatures):
     - `BTInfo`
     - `NewBufferFromFile`
     - `ByteOffset`
+    - `Log`
+    - `LogBuf`
 * `micro/util`
     - `RuneAt`
     - `GetLeadingWhitespace`