From 96800f1f69d840cecfbe01225b5cae00b8bd4f53 Mon Sep 17 00:00:00 2001
From: Carsten Seeger <cseeger@virtomize.com>
Date: Mon, 18 Dec 2023 13:10:10 +0100
Subject: [PATCH] feat: version flag

---
 go.mod       |  1 +
 go.sum       |  4 ++--
 lib/const.go | 17 +++++------------
 magefile.go  |  7 +++++--
 main.go      | 12 ++++++++++++
 5 files changed, 25 insertions(+), 16 deletions(-)

diff --git a/go.mod b/go.mod
index b9aba31..8d00230 100644
--- a/go.mod
+++ b/go.mod
@@ -13,6 +13,7 @@ require (
 	github.com/go-ldap/ldap v3.0.3+incompatible // indirect
 	github.com/golang/protobuf v1.3.2 // indirect
 	github.com/golang/snappy v0.0.3 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/google/uuid v1.2.0 // indirect
 	github.com/gopherjs/gopherjs v0.0.0-20191106031601-ce3c9ade29de // indirect
 	github.com/gorilla/websocket v1.4.2 // indirect
diff --git a/go.sum b/go.sum
index af186f5..2611874 100644
--- a/go.sum
+++ b/go.sum
@@ -106,8 +106,9 @@ github.com/gomodule/redigo v2.0.0+incompatible/go.mod h1:B4C85qUVwatsJoIUNIfCRsp
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
-github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
@@ -436,7 +437,6 @@ golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.0.0-20180910000450-7ca32eb868bf/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
 google.golang.org/api v0.0.0-20181030000543-1d582fd0359e/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
diff --git a/lib/const.go b/lib/const.go
index f456764..2eee6dd 100644
--- a/lib/const.go
+++ b/lib/const.go
@@ -1,18 +1,11 @@
 package mail2most
 
 const (
-	// ERROR .
-	ERROR string = "error"
-	// INFO .
-	INFO string = "info"
-	// DEBUG .
-	DEBUG string = "debug"
-	// LOGSTDOUT .
-	LOGSTDOUT string = "stdout"
-	// LOGFILE .
-	LOGFILE string = "logfile"
-	// LOGFORMATJSON .
+	ERROR         string = "error"
+	INFO          string = "info"
+	DEBUG         string = "debug"
+	LOGSTDOUT     string = "stdout"
+	LOGFILE       string = "logfile"
 	LOGFORMATJSON string = "json"
-	// LOGFORMATTEXT .
 	LOGFORMATTEXT string = "text"
 )
diff --git a/magefile.go b/magefile.go
index 688f136..53c2873 100644
--- a/magefile.go
+++ b/magefile.go
@@ -1,4 +1,5 @@
-//+build mage
+//go:build mage
+// +build mage
 
 package main
 
@@ -34,7 +35,9 @@ func Build() error {
 		return err
 	}
 
-	return sh.RunV("go", "build", "-a", "-tags", "netgo", "-o", binPath+"/"+binName, "-ldflags", "-w -extldflags \"-static\"")
+	tag, _ := exec.Command("bash", "-c", "git tag --sort=-version:refname | head -n 1").Output()
+
+	return sh.RunV("go", "build", "-a", "-tags", "netgo", "-o", binPath+"/"+binName, "-ldflags", "-w -extldflags \"-static\" -X 'main.Version="+string(tag)+"'")
 }
 
 // CreateRelease - mage build
diff --git a/main.go b/main.go
index ef5004c..7eae667 100644
--- a/main.go
+++ b/main.go
@@ -2,13 +2,17 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"log"
 
 	m2m "github.com/virtomize/mail2most/lib"
 )
 
+var Version string
+
 func main() {
 	confFile := flag.String("c", "conf/mail2most.conf", "path to config file")
+	version := flag.Bool("version", false, "display mail2most version")
 	flag.Parse()
 
 	m, err := m2m.New(*confFile)
@@ -16,6 +20,14 @@ func main() {
 		log.Fatal(err)
 	}
 
+	if *version {
+		if Version == "" {
+			fmt.Print("unknown")
+		}
+		fmt.Print(Version)
+		return
+	}
+
 	err = m.Run()
 	if err != nil {
 		log.Fatal(err)