feat!: introduce ChronoTomatoVersion

- set version from `runtime/debug.Main.Version`
- use latest git tag as fallback
- allow version to be overwritten via ldflags
- this will break `go build .` and `go install .`

cmd/client/app.go

@@ -2,8 +2,11 @@ package client
 
 import (
 	"flag"
+	"fmt"
+	"os"
 
 	"git.smsvc.net/pomodoro/ChronoTomato/internal/helper"
+	"git.smsvc.net/pomodoro/ChronoTomato/internal/metadata"
 	"git.smsvc.net/pomodoro/ChronoTomato/internal/websocket"
 	ChronoTomato "git.smsvc.net/pomodoro/ChronoTomato/pkg/models"
 	GoTomato "git.smsvc.net/pomodoro/GoTomato/pkg/models"
@@ -68,9 +71,15 @@ func Start() {
 		parameter_url        = flag.String("url", "", "GoTomato Server URL (eg ws://localhost:8080/ws)")
 		parameter_password   = flag.String("password", "", "Control password for pomodoro session")
 		parameter_configfile = flag.String("config", defaultConfigFile, "Path to config file")
+		showVersion          = flag.Bool("version", false, "Show Version")
 	)
 	flag.Parse()
 
+	if *showVersion {
+		fmt.Printf("ChronoTomato v%v\n", metadata.ChronoTomatoVersion)
+		os.Exit(0)
+	}
+
 	// read passed config file or try to use default config
 	if *parameter_configfile != defaultConfigFile {
 		config = helper.ParseConfig(*parameter_configfile)

internal/metadata/version.go

@@ -0,0 +1,33 @@
+package metadata
+
+import (
+	"os/exec"
+	"runtime/debug"
+	"strings"
+)
+
+var ChronoTomatoVersion = "" // The GoTomato version
+
+func stripVersionPrefix(version string) string {
+	return strings.TrimLeft(version, "v")
+}
+
+func getLatestTag() string {
+	bytes, _ := exec.Command("git", "describe", "--tags").Output()
+	output := strings.TrimSpace(string(bytes))
+	return stripVersionPrefix(output)
+}
+
+// set GoTomatoVersion from runtime/debug.Main.Version
+// use latest git tag as fallback
+// can be overwritten via ldflags (e,g. by goreleaser)
+func init() {
+	if ChronoTomatoVersion == "" {
+		info, _ := debug.ReadBuildInfo()
+		if info.Main.Version != "(devel)" {
+			ChronoTomatoVersion = stripVersionPrefix(info.Main.Version)
+		} else {
+			ChronoTomatoVersion = getLatestTag()
+		}
+	}
+}