implement -dump-config

goatherd.go

@@ -34,6 +34,9 @@ func (d *duration) UnmarshalJSON(b []byte) (err error) {
 
     return
 }
+func (d duration) MarshalJSON() ([]byte, error) {
+    return []byte(fmt.Sprintf(`"%s"`, d.String())), nil
+}
 
 
 var cfg struct {
@@ -361,6 +364,7 @@ func main() {
     flag_add_user := flag.String("add-user", "", "Add new user to the database. If '-' read name from stdin.")
     flag_secret := flag.String("secret", "-", "Secret for the new user. If '-' read from stdin.")
     flag_serve := flag.Bool("serve", false, "Start daemon.")
+    flag_dump_config := flag.Bool("dump-config", false, "Dump the effective config to stdout.")
 
     // also settable in config file
     flag.StringVar(&cfg.Db_url, "db-url", ":memory:", "URL used to connect to the database.")
@@ -390,6 +394,13 @@ func main() {
     // default action is to serve, but not if one of the other actions is given
     serve_default := true
 
+    if *flag_dump_config {
+        serve_default = false
+        enc := json.NewEncoder(os.Stdout)
+        enc.SetIndent("", "\t")
+        err_fatal(enc.Encode(cfg))
+    }
+
     if *flag_init_db {
         serve_default = false
         create_table(db)