Added script to generate stats on a git checkout

infra/tools/antibody/git_commit_parser.py

Index: infra/tools/antibody/git_commit_parser.py
diff --git a/infra/tools/antibody/git_commit_parser.py b/infra/tools/antibody/git_commit_parser.py
index d126654b672d77f3c14b1e6d9759d38bf1c2266a..02df5998608146d10696979beff1193ef6a8b0f0 100644
--- a/infra/tools/antibody/git_commit_parser.py
+++ b/infra/tools/antibody/git_commit_parser.py
@@ -21,6 +21,7 @@ def read_commit_info(git_checkout_path, commits_after_date,
   Args:
     git_checkout_path(str): path to a local git checkout
     git_log_format(str): formatting directives passed to git log --format
+
   Return:
     log(str): output of git log
   """
@@ -65,12 +66,18 @@ def get_bug_url(git_line):
 
 def get_tbr(git_line):
   tbr = None
-  if git_line.startswith('TBR=') and len(git_line) > 4:
-    tbr = git_line[4:]
-    tbr = [x.strip() for x in tbr.split(',')]
+  if git_line.startswith('TBR='):
+    if len(git_line) > 4:
+      tbr = git_line[4:]
+      tbr = [x.strip() for x in tbr.split(',')]
+    else:
+      tbr = ['NOBODY']
   return tbr
 
 
+# TODO(keelerh): figure out how to parse existence of a review url if
+# not prefaced by any indicator (because review urls for other commits
+# appear in the commit message frequently for reverts and references)
 def get_review_url(git_line):
   review_url = None
   if re.match(r'^Review:.+$', git_line):