add basic clang-format script

.clang-format

+---
+# https://clang.llvm.org/docs/ClangFormatStyleOptions.html#
+# the "Visual Studio" style is similar to:
+BasedOnStyle: LLVM
+UseTab: Never
+IndentWidth: 4
+BreakBeforeBraces: Allman
+AccessModifierOffset: -4
+SortIncludes: false
+ColumnLimit: 0
+...

format_code.py

+#! /usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# This script runs "clang-format" recursively on all C/C++ files
+
+import sys
+import os
+import fnmatch
+import re
+import subprocess
+
+
+def all_files(root,
+              patterns='*',
+              skips='*.git*;*build*',
+              single_level=False,
+              yield_folders=False):
+    # self.checkPath(root)
+    patterns = patterns.split(';')
+    skips = skips.split(';')
+    for path, subdirs, files in os.walk(root):
+        # print('processing folder', path)
+        if yield_folders:
+            files.extend(subdirs)
+        files.sort()
+        for name in files:
+            for pattern in patterns:
+                if fnmatch.fnmatch(name, pattern):
+                    fullname = os.path.join(path, name)
+                    ok = True
+                    for skip in skips:
+                        if fnmatch.fnmatch(fullname, skip):
+                            ok = False
+                    if ok:
+                        yield fullname
+                        break
+        if single_level:
+            break
+
+
+def main():
+
+    # loop over all files and format them
+    encs = {}
+    for f in all_files(os.getcwd(), patterns='*.cpp;*.c;*.h;*.hpp',
+                       skips='*.git*;*build*'):
+        print(f)
+        cmd = ['clang-format', "-style=file", "-i", f]
+        retcode = subprocess.call(cmd)
+        if retcode != 0:
+            print(f'ERROR: retcode = {retcode}')
+            break
+
+
+if __name__ == "__main__":
+    main()