feat: customize the version command

caddy/mercure/main.go

@@ -1,14 +1,38 @@
-// Copied from https://github.com/caddyserver/xcaddy/blob/b7fd102f41e12be4735dc77b0391823989812ce8/environment.go#L251
+// Adapted from https://github.com/caddyserver/xcaddy/blob/b7fd102f41e12be4735dc77b0391823989812ce8/environment.go#L251
 package main
 
 import (
+	"fmt"
+	"runtime/debug"
+
+	caddy "github.com/caddyserver/caddy/v2"
 	caddycmd "github.com/caddyserver/caddy/v2/cmd"
 
 	// plug in Caddy modules here.
 	_ "github.com/caddyserver/caddy/v2/modules/standard"
 	_ "github.com/dunglas/mercure/caddy"
 )
 
+//nolint:gochecknoinits
+func init() {
+	if caddy.CustomVersion != "" {
+		return
+	}
+
+	version := "(unknown)"
+	if bi, ok := debug.ReadBuildInfo(); ok {
+		for _, m := range bi.Deps {
+			if m.Path == "github.com/dunglas/mercure" {
+				version = m.Version
+
+				break
+			}
+		}
+	}
+
+	caddy.CustomVersion = fmt.Sprintf("Mercure.rocks %s Caddy", version)
+}
+
 func main() {
 	caddycmd.Main()
 }