Fix quiet mode in git-clang-format

[Gvald]

Summary

Do not generate output in quiet mode, when no modified files exists

[Gvald]

Quiet mode is very useful for scripting, when only the diff format output is required, or no output if not formatting is needed.
In case of no modified files, git-clang-format will output to screen even though the quiet mode enabled.

This patch changes this behavior, so if quiet flag passes in - no output will be available, even if no modified files exists.

[serge-sans-paille]

clang/tools/clang-format/git-clang-format

151–152

nit: PEP8 recommends opts.verbose >= 0. LGTM otherwise.

[Gvald]

PEP8 compliance fix

[Gvald]

Tried to arc land but don't have the permissions.
From LLVM docs:

It is sufficient to add a comment to the approved review indicating you cannot commit the patch yourself

So here it is, the comment... 😃

[Gvald]

@serge-sans-paille - the diff is PEP8 compliant now.
Care to commit, as I don't have the right permissions?

[serge-sans-paille]

Sure, thanks for your patience!

[serge-sans-paille]

I'll need a contact email to preserve authorship information, can you send me one at [e-mail]? Thanks!

clang/tools/clang-format/git-clang-format

if ignored_files:
       print('Ignoring changes in the following files (wrong extension):')
       for filename in ignored_files:
         print('    %s' % filename)
     if changed_lines:
       print('Running clang-format on the following files:')
       for filename in changed_lines:
         print('    %s' % filename)
   if not changed_lines:
+    if opts.verbose >= 0:
       print('no modified files to format')
     return
   # The computed diff outputs absolute paths, so we must cd before accessing
   # those files.
   cd_to_toplevel()
   if len(commits) > 1:
     old_tree = commits[1]
     new_tree = run_clang_format_and_save_to_tree(changed_lines,
                                                  revision=commits[1],