print version with tensorboard --version (#2097)

Author: shashvatshahi1998

tensorboard/plugins/core/core_plugin.py

@@ -376,6 +376,11 @@ def define_flags(self, parser):
 
 See tensorboard/backend/event_processing/event_file_inspector.py for more info.\
 ''')
+    
+    parser.add_argument(
+        '--version',
+        action='store_true',
+        help='Prints the version of Tensorboard')
 
     parser.add_argument(
         '--tag',
@@ -459,7 +464,9 @@ def define_flags(self, parser):
   def fix_flags(self, flags):
     """Fixes standard TensorBoard CLI flags to parser."""
     FlagsError = base_plugin.FlagsError
-    if flags.inspect:
+    if flags.version:
+      pass  
+    elif flags.inspect:
       if flags.logdir and flags.event_file:
         raise FlagsError(
             'Must specify either --logdir or --event_file, but not both.')

tensorboard/plugins/core/core_plugin_test.py

@@ -46,12 +46,14 @@
 class FakeFlags(object):
   def __init__(
       self,
-      inspect,
+      inspect=False,
+      version=False,
       logdir='',
       event_file='',
       db='',
       path_prefix=''):
     self.inspect = inspect
+    self.version = version
     self.logdir = logdir
     self.event_file = event_file
     self.db = db
@@ -80,6 +82,7 @@ def testRoutesProvided(self):
   def testFlag(self):
     loader = core_plugin.CorePluginLoader()
     loader.fix_flags(FakeFlags(inspect=True, logdir='/tmp'))
+    loader.fix_flags(FakeFlags(version=True))
     loader.fix_flags(FakeFlags(inspect=True, event_file='/tmp/event.out'))
     loader.fix_flags(FakeFlags(inspect=False, logdir='/tmp'))
     loader.fix_flags(FakeFlags(inspect=False, db='sqlite:foo'))

tensorboard/program.py

@@ -221,6 +221,9 @@ def main(self, ignored_argv=('',)):
       event_file = os.path.expanduser(self.flags.event_file)
       efi.inspect(self.flags.logdir, event_file, self.flags.tag)
       return 0
+    if self.flags.version:
+      print(version.VERSION)
+      return 0
     try:
       server = self._make_server()
       sys.stderr.write('TensorBoard %s at %s (Press CTRL+C to quit)\n' %