Add .clang-format and auto-indent script

.clang-format

@@ -0,0 +1,34 @@
+---
+BasedOnStyle: Google
+AlignConsecutiveBitFields: AcrossEmptyLinesAndComments
+AlignTrailingComments: 'true'
+AlignConsecutiveAssignments: Consecutive
+AllowShortFunctionsOnASingleLine: 'false'
+ColumnLimit: '80'
+DerivePointerAlignment: 'false'
+IndentExternBlock: NoIndent
+IndentWidth: '4'
+NamespaceIndentation: Inner
+
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterCaseLabel:  'true'
+  AfterClass:      'true'
+  AfterControlStatement: Always
+  AfterEnum:       'true'
+  AfterFunction:   'true'
+  AfterNamespace:  'true'
+  AfterObjCDeclaration: 'true'
+  AfterStruct:     'true'
+  AfterUnion:      'true'
+  AfterExternBlock: 'false'
+  BeforeCatch:     'true'
+  BeforeElse:      'true'
+  BeforeLambdaBody: 'true'
+  BeforeWhile:     'false'
+  IndentBraces:    'false'
+  SplitEmptyFunction: 'true'
+  SplitEmptyRecord: 'true'
+  SplitEmptyNamespace: 'true'
+
+...

scripts/clang_format.sh

@@ -0,0 +1,52 @@
+#!/bin/bash -e
+
+#  Copyright (C) 2021 by Alain Carlucci.
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, see <http://www.gnu.org/licenses/>
+
+function show_help {
+    echo "OpenRTX clang-format tool."
+    echo ""
+    echo "Usage: $0 [--check] [--help]"
+    echo ""
+    echo "To apply clang-format style to the whole codebase, run without arguments"
+    echo "To check if the codebase is compliant, run with --check"
+}
+
+if [ $# -gt 1 ]; then
+    show_help
+    exit 1
+fi
+
+if [ $# -eq 1 ]; then
+    if [ "$1" == "--help" ]; then
+        show_help
+        exit 0
+    fi
+
+    if [ "$1" != "--check" ]; then
+        echo "Invalid argument $1"
+        show_help
+        exit 1
+    fi
+fi
+
+FILE_LIST=$(git ls-files | egrep '\.(c|cpp|h)$' | egrep -v 'lib/|subprojects/|platform/mcu')
+
+CHECK_ARGS=""
+if [ "$1" == "--check" ]; then
+    CHECK_ARGS="--dry-run -Werror"
+fi
+
+clang-format $CHECK_ARGS -i $FILE_LIST