Add clang formatting script and format all sample and src files

.clang-format

@@ -0,0 +1,77 @@
+---
+Language:        Cpp
+# BasedOnStyle:  Chromium
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros: true
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: Right
+AlignOperands:   false
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterCaseLabel:  false
+  AfterClass:      false
+  AfterControlStatement: false
+  AfterEnum:       false
+  AfterFunction:   false
+  AfterStruct:     false
+  AfterUnion:      false
+  AfterExternBlock: false
+  BeforeCatch:     false
+  BeforeElse:      false
+  IndentBraces:    false
+  SplitEmptyFunction: false
+  AfterNamespace: false
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: WebKit
+BreakBeforeTernaryOperators: true
+BreakStringLiterals: true
+ColumnLimit:     150
+CommentPragmas:  '^ IWYU pragma:'
+ContinuationIndentWidth: 4
+DerivePointerAlignment: false
+IncludeBlocks:   Preserve
+IndentCaseLabels: true
+IndentGotoLabels: true
+IndentPPDirectives: None
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+CompactNamespaces: false
+KeepEmptyLinesAtTheStartOfBlocks: false
+PenaltyBreakAssignment: 2
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 200
+PointerAlignment: Left
+ReflowComments:  true
+SortIncludes:    false
+SpaceAfterCStyleCast: true
+SpaceAfterLogicalNot: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInConditionalStatement: false
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+SpaceBeforeSquareBrackets: false
+Standard:        Auto
+TabWidth:        4
+UseTab:          Never

.github/workflows/ci.yml

@@ -10,6 +10,19 @@ on:
       - master
 
 jobs:
+  clang-format-check:
+    runs-on: macos-11
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v3
+      - name: Install clang-format
+        run: |
+          brew install clang-format
+          clang-format --version
+      - name: Run clang format check
+        run: |
+          bash scripts/check-clang.sh
+
   mac-os-build-clang:
     runs-on: macos-12
     env:

scripts/check-clang.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+if [[ -z $CLANG_FORMAT ]] ; then
+    CLANG_FORMAT=clang-format
+fi
+
+if NOT type $CLANG_FORMAT 2> /dev/null ; then
+    echo "No appropriate clang-format found."
+    exit 1
+fi
+
+FAIL=0
+SOURCE_FILES=`find src samples -type f \( -name '*.h' -o -name '*.c' \) -not -path "*/external/*"`
+echo "Performing clang format compliance check...."
+for i in $SOURCE_FILES
+do
+    $CLANG_FORMAT -output-replacements-xml $i | grep -c "<replacement " > /dev/null
+    if [ $? -ne 1 ]
+    then
+        echo "$i failed clang-format check."
+        FAIL=1
+    fi
+done
+
+if [ $FAIL -ne 1 ]; then
+        echo "Clang check passed for the project"
+fi
+
+exit $FAIL

scripts/clang-format.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+parse_args() {
+	while [[ $# -gt 0 ]]
+	do
+	key="$1"
+		case $key in
+		    -f)
+			echo "Clang formatting the files specified"
+		    clang-format -style=file -i -fallback-style=none $2
+		    shift # past argument
+		    shift # past value
+		    ;;
+		    -d)
+			echo "Clang formatting all files in the directory"
+			find $2 -iname *.h -o -iname *.cpp -o -iname *.h | xargs clang-format -style=file -i -fallback-style=none
+		    shift # past argument
+		    shift # past value
+		    ;;
+		    -g)
+			echo "Clang formatting only git diff'ed output"
+			clang-format -style=file -fallback-style=none -i `git ls-files -om "*.[ch]"`
+		    shift # past argument
+		    ;;
+		    -h|--help)
+			echo "-f: Pass list of files to be clang formatted"
+			echo "-a: Clang format all files in the project"
+			echo "-d: Clang format all files in the directory passed after this option"
+			echo "-g: Clang formatting only git diff'ed output"
+		    exit 0
+		    ;;
+		    *)    # unknown option
+		    echo "Unknown option $key"
+		    exit 1
+		    ;;
+		esac
+	done
+}
+
+parse_args $@