add branch name or tag in admin index

library/Class/BokehVersion.php

@@ -21,7 +21,10 @@
 
 
 class Class_BokehVersion {
-  use Trait_SimpleWebClient;
+  use
+    Trait_SimpleWebClient,
+    Trait_StaticCommand;
+
 
   public function current() {
     return BOKEH_RELEASE_NUMBER;
@@ -62,4 +65,11 @@ class Class_BokehVersion {
       ? current($versions)['name']
       : $this->current();
   }
+
+
+  public function getCurrentBranchName() : string {
+    $command = $this->getCommand();
+    return trim($command->exec(sprintf('cd %s && git name-rev --name-only HEAD 2>&1',
+                                       ROOT_PATH)));
+  }
 }
\ No newline at end of file