code: Add clang format target, rules and CI workflow

.ci/clang-format.sh

@@ -0,0 +1,37 @@
+#!/bin/bash -ex
+
+if grep -nrI '\s$' src *.yml *.txt *.md Doxyfile .gitignore .gitmodules .ci* dist/*.desktop \
+                 dist/*.svg dist/*.xml; then
+    echo Trailing whitespace found, aborting
+    exit 1
+fi
+
+# Default clang-format points to default 3.5 version one
+CLANG_FORMAT=clang-format-15
+$CLANG_FORMAT --version
+
+if [ "$GITHUB_EVENT_NAME" = "pull_request" ]; then
+    # Get list of every file modified in this pull request
+    files_to_lint="$(git diff --name-only --diff-filter=ACMRTUXB $COMMIT_RANGE | grep '^src/[^.]*[.]\(cpp\|h\)$' || true)"
+else
+    # Check everything for branch pushes
+    files_to_lint="$(find src/ -name '*.cpp' -or -name '*.h')"
+fi
+
+# Turn off tracing for this because it's too verbose
+set +x
+
+for f in $files_to_lint; do
+    d=$(diff -u "$f" <($CLANG_FORMAT "$f") || true)
+    if ! [ -z "$d" ]; then
+        echo "!!! $f not compliant to coding style, here is the fix:"
+        echo "$d"
+        fail=1
+    fi
+done
+
+set -x
+
+if [ "$fail" = 1 ]; then
+    exit 1
+fi

.github/workflows/format.yml

@@ -0,0 +1,21 @@
+name: shad-format
+
+on:
+  push:
+    branches: [ "*" ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  clang-format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Install
+        run: sudo apt-get install clang-format-15
+      - name: Build
+        env:
+          COMMIT_RANGE: ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }}
+        run: ./.ci/clang-format.sh

CMakeLists.txt

@@ -27,6 +27,57 @@ function(create_target_directory_groups target_name)
     endforeach()
 endfunction()
 
+
+# Setup a custom clang-format target (if clang-format can be found) that will run
+# against all the src files. This should be used before making a pull request.
+# =======================================================================
+
+set(CLANG_FORMAT_POSTFIX "-15")
+find_program(CLANG_FORMAT
+    NAMES clang-format${CLANG_FORMAT_POSTFIX}
+          clang-format
+    PATHS ${PROJECT_BINARY_DIR}/externals)
+# if find_program doesn't find it, try to download from externals
+if (NOT CLANG_FORMAT)
+    if (WIN32)
+        message(STATUS "Clang format not found! Downloading...")
+        set(CLANG_FORMAT "${PROJECT_BINARY_DIR}/externals/clang-format${CLANG_FORMAT_POSTFIX}.exe")
+        file(DOWNLOAD
+            https://github.com/citra-emu/ext-windows-bin/raw/master/clang-format${CLANG_FORMAT_POSTFIX}.exe
+            "${CLANG_FORMAT}" SHOW_PROGRESS
+            STATUS DOWNLOAD_SUCCESS)
+        if (NOT DOWNLOAD_SUCCESS EQUAL 0)
+            message(WARNING "Could not download clang format! Disabling the clang format target")
+            file(REMOVE ${CLANG_FORMAT})
+            unset(CLANG_FORMAT)
+        endif()
+    else()
+        message(WARNING "Clang format not found! Disabling the clang format target")
+    endif()
+endif()
+
+if (CLANG_FORMAT)
+    set(SRCS ${PROJECT_SOURCE_DIR}/src)
+    set(CCOMMENT "Running clang format against all the .h and .cpp files in src/")
+    if (WIN32)
+        if(MINGW)
+            add_custom_target(clang-format
+                COMMAND find `cygpath -u ${SRCS}` -iname *.h -o -iname *.cpp -o -iname *.mm | xargs `cygpath -u ${CLANG_FORMAT}` -i
+                COMMENT ${CCOMMENT})
+        else()
+            add_custom_target(clang-format
+                COMMAND powershell.exe -Command "Get-ChildItem '${SRCS}/*' -Include *.cpp,*.h,*.mm -Recurse | Foreach {&'${CLANG_FORMAT}' -i $_.fullname}"
+                COMMENT ${CCOMMENT})
+        endif()
+    else()
+        add_custom_target(clang-format
+            COMMAND find ${SRCS} -iname *.h -o -iname *.cpp -o -iname *.mm | xargs ${CLANG_FORMAT} -i
+            COMMENT ${CCOMMENT})
+    endif()
+    unset(SRCS)
+    unset(CCOMMENT)
+endif()
+
 add_subdirectory(third-party)
 include_directories(src)
 

src/.clang-format

@@ -0,0 +1,256 @@
+---
+Language:        Cpp
+# BasedOnStyle:  LLVM
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlinesLeft: false
+AlignOperands: true
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: true
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterClass:      false
+  AfterControlStatement: false
+  AfterEnum:       false
+  AfterFunction:   false
+  AfterNamespace:  false
+  AfterObjCDeclaration: false
+  AfterStruct:     false
+  AfterUnion:      false
+  BeforeCatch:     false
+  BeforeElse:      false
+  IndentBraces:    false
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Attach
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+ColumnLimit:     100
+CommentPragmas:  '^ IWYU pragma:'
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+DisableFormat:   false
+ForEachMacros:   [ foreach, Q_FOREACH, BOOST_FOREACH ]
+IncludeCategories:
+  - Regex:           '^\<[^Q][^/.>]*\>'
+    Priority:        -2
+  - Regex:           '^\<'
+    Priority:        -1
+  - Regex:           '^\"'
+    Priority:        0
+IndentCaseLabels: false
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: true
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 150
+PointerAlignment: Left
+ReflowComments:  true
+SortIncludes:    true
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard:        Cpp11
+TabWidth:        4
+UseTab:          Never
+---
+Language:        Java
+# BasedOnStyle:  LLVM
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlinesLeft: false
+AlignOperands: true
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: true
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterClass:      false
+  AfterControlStatement: false
+  AfterEnum:       false
+  AfterFunction:   false
+  AfterNamespace:  false
+  AfterObjCDeclaration: false
+  AfterStruct:     false
+  AfterUnion:      false
+  BeforeCatch:     false
+  BeforeElse:      false
+  IndentBraces:    false
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Attach
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+ColumnLimit:     100
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+DisableFormat:   false
+IncludeCategories:
+  - Regex:           '^\<[^Q][^/.>]*\>'
+    Priority:        -2
+  - Regex:           '^\<'
+    Priority:        -1
+  - Regex:           '^\"'
+    Priority:        0
+IndentCaseLabels: false
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: true
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 150
+PointerAlignment: Left
+ReflowComments:  true
+SortIncludes:    true
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth:        4
+UseTab:          Never
+---
+Language:        ObjC
+# BasedOnStyle:  LLVM
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlinesLeft: false
+AlignOperands: true
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: true
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterClass:      false
+  AfterControlStatement: false
+  AfterEnum:       false
+  AfterFunction:   false
+  AfterNamespace:  false
+  AfterObjCDeclaration: false
+  AfterStruct:     false
+  AfterUnion:      false
+  BeforeCatch:     false
+  BeforeElse:      false
+  IndentBraces:    false
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Attach
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+ColumnLimit:     100
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+DisableFormat:   false
+IncludeCategories:
+  - Regex:           '^\<[^Q][^/.>]*\>'
+    Priority:        -2
+  - Regex:           '^\<'
+    Priority:        -1
+  - Regex:           '^\"'
+    Priority:        0
+IndentCaseLabels: false
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: true
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 150
+PointerAlignment: Left
+ReflowComments:  true
+SortIncludes:    true
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth:        4
+UseTab:          Never
+...