From 6f6b263d102d37901d4e25e80db9760b924a7d30 Mon Sep 17 00:00:00 2001
From: Zachary Yedidia <zyedidia@gmail.com>
Date: Mon, 26 Aug 2019 21:06:27 -0400
Subject: [PATCH] Add some plugin functions

---
 cmd/micro/initlua.go   |  3 +++
 internal/buffer/loc.go | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/cmd/micro/initlua.go b/cmd/micro/initlua.go
index 1c6715e1..17d64cb6 100644
--- a/cmd/micro/initlua.go
+++ b/cmd/micro/initlua.go
@@ -70,6 +70,8 @@ func luaImportMicroConfig() *lua.LTable {
 	ulua.L.SetField(pkg, "RTSyntax", luar.New(ulua.L, config.RTSyntax))
 	ulua.L.SetField(pkg, "RTHelp", luar.New(ulua.L, config.RTHelp))
 	ulua.L.SetField(pkg, "RTPlugin", luar.New(ulua.L, config.RTPlugin))
+	ulua.L.SetField(pkg, "RegisterCommonOption", luar.New(ulua.L, config.RegisterCommonOption))
+	ulua.L.SetField(pkg, "RegisterGlobalOption", luar.New(ulua.L, config.RegisterGlobalOption))
 
 	return pkg
 }
@@ -111,6 +113,7 @@ func luaImportMicroBuffer() *lua.LTable {
 	ulua.L.SetField(pkg, "NewBufferFromFile", luar.New(ulua.L, func(path string) (*buffer.Buffer, error) {
 		return buffer.NewBufferFromFile(path, buffer.BTDefault)
 	}))
+	ulua.L.SetField(pkg, "ByteOffset", luar.New(ulua.L, buffer.ByteOffset))
 
 	return pkg
 }
diff --git a/internal/buffer/loc.go b/internal/buffer/loc.go
index 0fa682b1..89db7b89 100644
--- a/internal/buffer/loc.go
+++ b/internal/buffer/loc.go
@@ -123,3 +123,15 @@ func (l Loc) Diff(a, b Loc, buf *Buffer) int {
 func (l Loc) Move(n int, buf *Buffer) Loc {
 	return l.MoveLA(n, buf.LineArray)
 }
+
+// ByteOffset is just like ToCharPos except it counts bytes instead of runes
+func ByteOffset(pos Loc, buf *Buffer) int {
+	x, y := pos.X, pos.Y
+	loc := 0
+	for i := 0; i < y; i++ {
+		// + 1 for the newline
+		loc += len(buf.Line(i)) + 1
+	}
+	loc += len(buf.Line(y)[:x])
+	return loc
+}