first draft at stamping, broken because i'm not using workspaces

MODULE.bazel

@@ -10,7 +10,7 @@ bazel_dep(name = "rules_pkg", version = "0.9.1")
 
 go_deps = use_extension("@gazelle//:extensions.bzl", "go_deps")
 go_deps.from_file(go_mod = "//:go.mod")
-use_repo(go_deps, "com_github_engoengine_engo", "com_github_threedotslabs_watermill")
+use_repo(go_deps, "com_github_engoengine_ecs", "com_github_threedotslabs_watermill")
 
 oci = use_extension("@rules_oci//oci:extensions.bzl", "oci")
 oci.pull(

cmd/echo/BUILD.bazel

@@ -20,6 +20,10 @@ go_binary(
     name = "echo",
     embed = [":echo_lib"],
     visibility = ["//visibility:public"],
+    x_defs = {
+        "code.ndumas.com/ndumas/gomud.Version":"STABLE_GIT_VERSION",
+        "code.ndumas.com/ndumas/gomud.Build":"STABLE_GIT_COMMIT",
+    },
 )
 
 load("@rules_pkg//:pkg.bzl", "pkg_tar")

cmd/echo/main.go

@@ -14,6 +14,7 @@ import (
 	"github.com/ThreeDotsLabs/watermill/message/router/plugin"
 	"github.com/ThreeDotsLabs/watermill/pubsub/gochannel"
 
+	"code.ndumas.com/ndumas/gomud"
 	"code.ndumas.com/ndumas/gomud/engine"
 	"code.ndumas.com/ndumas/gomud/logger"
 	"code.ndumas.com/ndumas/gomud/telnet"
@@ -22,14 +23,21 @@ import (
 var (
 	port        int
 	verbose     int
+	versionFlag bool
 )
 
 func main() {
 
 	flag.IntVar(&verbose, "verbose", 0, "-5:Trace, -4:Debug, 0:Info, 4:Warn, 8:Error")
 	flag.IntVar(&port, "port", 5555, "MUD server port")
+	flag.BoolVar(&versionFlag, "version", false, "print build version")
 	flag.Parse()
 
+	if versionFlag {
+		fmt.Printf("%s@%s\n", gomud.VERSION, gomud.BUILD)
+		return
+	}
+
 	l, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
 	if err != nil {
 		log.Fatalf("error binding to port %d\n: %s", port, err)

git-desc.sh

@@ -0,0 +1,6 @@
+#! /bin/bash
+
+tag=$(git describe --tags --dirty=-dev)
+commit=$(git rev-parse HEAD | head -c8)
+echo "STABLE_GIT_VERSION:$tag"
+echo "STABLE_GIT_COMMIT:$commit"

version.go

@@ -0,0 +1,6 @@
+package gomud
+
+const (
+	VERSION = ""
+	BUILD   = ""
+)