1 files changed, 80 insertions, 0 deletions
diff --git a/doMtime.go b/doMtime.go
new file mode 100644
index 0000000..4f69642
--- /dev/null
+++ b/doMtime.go
@@ -0,0 +1,80 @@
+//go:build go1.20
+// +build go1.20
+
+// Copyright 2017-2025 WIT.COM Inc. All rights reserved.
+// Use of this source code is governed by the GPL 3.0
+
+// protobuf the way I am using them, require GO 1.20. I think. I could be wrong.
+// The Go Protocol Buffers library embeds a sync.Mutex within the MessageState struct to prevent unintended shallow copies of message structs
+// this optionally (but it is the default) inserts a mutex into the struct generated by protoc
+
+// go:generate autogenpb --proto file.proto
+
+package main
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+
+	"go.wit.com/lib/config"
+	"go.wit.com/log"
+)
+
+func doClean(filebase string) error {
+	globPattern := filebase + "*.pb.go"
+	files, err := filepath.Glob(globPattern)
+	if err != nil {
+		log.Info("glob error", err, files)
+	}
+	for _, filename := range files {
+		// err += os.Remove(filename)
+		err = errors.Join(err, os.Remove(filename))
+	}
+	log.Info("Removed:", files)
+	return err
+}
+
+// is true if no errors and nothing is new
+func doMtime(filebase string) bool {
+	var allerr error
+	statf, err := os.Stat(filebase + ".proto")
+	allerr = errors.Join(allerr, err)
+	basetime := statf.ModTime()
+	globPattern := filebase + "*.pb.go"
+	files, err := filepath.Glob(globPattern)
+	if err != nil {
+		log.Info("glob error", err, files)
+		allerr = errors.Join(allerr, err)
+	}
+	if len(files) == 0 {
+		log.Info("no pb.go files found. need to re-run")
+		return false
+	}
+	for _, filename := range files {
+		fstats, err := os.Stat(filename)
+		allerr = errors.Join(allerr, err)
+		newtime := fstats.ModTime()
+		if basetime.Before(newtime) {
+			// everything is okay
+			// log.Info(filebase+".proto was older than", filename)
+		} else {
+			log.Info(filebase+".proto was newer than", filename)
+			// need to rerun
+			err := doClean(filebase)
+			allerr = errors.Join(allerr, err)
+			if allerr != nil {
+				log.Info("autogenpb doMtime() had errors:", allerr)
+			}
+			return false
+		}
+	}
+	if config.Verbose() {
+		log.Info(filebase + ".proto was older than all pb.go files. No need to re-run autogenpb.")
+	}
+	if allerr == nil {
+		return true
+	}
+	log.Info("autogenpb doMtime() had errors:", allerr)
+	return false
+}