branch = None

      if branchname and branchname in repo_obj.listall_branches():

          branch = repo_obj.lookup_branch(branchname)

      elif branchname:

          try:

              commit = repo_obj.get(branchname)

          if "refs/tags/%s" % branchname in list(repo_obj.references):

              ref = repo_obj.lookup_reference("refs/tags/%s" % branchname)

          # If we're arriving here from the release page, we may have a Tag

          # where we expected a commit, in this case, get the actual commit

          if isinstance(commit, pygit2.Tag):

              branchname = commit.oid.hex

      elif not repo_obj.is_empty and not repo_obj.head_is_unborn:

          branch = repo_obj.lookup_branch(repo_obj.head.shorthand)

          branchname = branch.branch_name

      if not repo_obj.is_empty and not repo_obj.head_is_unborn:

      if identifier in repo_obj.listall_branches():

          branchname = identifier

          branch = repo_obj.lookup_branch(identifier)

      else:

          try:

              commit = repo_obj.get(identifier)

              branchname = "master"

      if isinstance(commit, pygit2.Tag):

      tree = None

      if isinstance(commit, pygit2.Tree):

      if identifier in repo_obj.listall_branches():

          branch = repo_obj.lookup_branch(identifier)

      else:

          try:

              commit = repo_obj.get(identifier)

          flask.abort(404, "Commit %s not found" % (identifier))

      if isinstance(commit, pygit2.Tag):

      if filename:

          if isinstance(commit, pygit2.Blob):

      if branchname in repo_obj.listall_branches():

          branch = repo_obj.lookup_branch(branchname)

      else:

          try:

              commit = repo_obj[branchname]

              commit = repo_obj[repo_obj.head.target]

      if isinstance(commit, pygit2.Tag):

      content = __get_file_in_tree(

          repo_obj, commit.tree, filename.split("/"), bail_on_tree=True

          if identifier in repo_obj.listall_branches():

              branchname = identifier

              branch = repo_obj.lookup_branch(identifier)

          else:

              try:

                  commit = repo_obj.get(identifier)

          # If we're arriving here from the release page, we may have a Tag

          # where we expected a commit, in this case, get the actual commit

          if isinstance(commit, pygit2.Tag):

              branchname = commit.oid.hex

          if commit and not isinstance(commit, pygit2.Blob):

      branch = None

      if branchname in repo_obj.listall_branches():

          branch = repo_obj.lookup_branch(branchname)

      else:

          flask.abort(400, "Invalid branch specified")