Add clang-format config file

This is used in preparation to enable automatic code-formatting in the
following commits.  For now let's just add a clang-format config file,
formatting of source files will follow.

related: #16019

Signed-off-by: Luca Saccarola <github.e41mv@aleeas.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

.clang-format

@@ -0,0 +1,254 @@
+---
+Language: Cpp
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignArrayOfStructures: None
+AlignConsecutiveAssignments:
+  Enabled: false
+  AcrossEmptyLines: false
+  AcrossComments: false
+  AlignCompound: false
+  AlignFunctionPointers: false
+  PadOperators: false
+AlignConsecutiveBitFields:
+  Enabled: false
+  AcrossEmptyLines: false
+  AcrossComments: false
+  AlignCompound: false
+  AlignFunctionPointers: false
+  PadOperators: false
+AlignConsecutiveDeclarations:
+  Enabled: false
+  AcrossEmptyLines: false
+  AcrossComments: false
+  AlignCompound: false
+  AlignFunctionPointers: false
+  PadOperators: false
+AlignConsecutiveMacros:
+  Enabled: false
+  AcrossEmptyLines: false
+  AcrossComments: false
+  AlignCompound: false
+  AlignFunctionPointers: false
+  PadOperators: false
+AlignConsecutiveShortCaseStatements:
+  Enabled: false
+  AcrossEmptyLines: false
+  AcrossComments: false
+  AlignCaseColons: false
+AlignEscapedNewlines: DontAlign
+AlignOperands: Align
+AlignTrailingComments:
+  Kind: Leave
+  OverEmptyLines: 0
+AllowAllArgumentsOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowBreakBeforeNoexceptSpecifier: Never
+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortCompoundRequirementOnASingleLine: true
+AllowShortEnumsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLambdasOnASingleLine: None
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: All
+AlwaysBreakAfterReturnType: AllDefinitions
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: MultiLine
+BinPackArguments: true
+BinPackParameters: false
+BitFieldColonSpacing: Both
+BraceWrapping:
+  AfterCaseLabel: true
+  AfterClass: true
+  AfterControlStatement: Always
+  AfterEnum: true
+  AfterExternBlock: true
+  AfterFunction: true
+  AfterNamespace: true
+  AfterObjCDeclaration: true
+  AfterStruct: true
+  AfterUnion: true
+  BeforeCatch: true
+  BeforeElse: true
+  BeforeLambdaBody: false
+  BeforeWhile: true
+  IndentBraces: false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+BreakAdjacentStringLiterals: true
+BreakAfterAttributes: Leave
+BreakAfterJavaFieldAnnotations: false
+BreakArrays: true
+BreakBeforeBinaryOperators: None
+BreakBeforeConceptDeclarations: Always
+BreakBeforeBraces: Custom
+BreakBeforeInlineASMColon: OnlyMultiline
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeColon
+BreakInheritanceList: BeforeColon
+BreakStringLiterals: true
+ColumnLimit: 80
+CommentPragmas: '^ IWYU pragma:'
+CompactNamespaces: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: false
+DerivePointerAlignment: false
+DisableFormat: false
+EmptyLineAfterAccessModifier: Never
+EmptyLineBeforeAccessModifier: LogicalBlock
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: false
+IfMacros:
+  - KJ_IF_MAYBE
+IncludeBlocks: Preserve
+IncludeCategories:
+  - Regex: '^"(llvm|llvm-c|clang|clang-c)/'
+    Priority: 2
+    SortPriority: 0
+    CaseSensitive: false
+  - Regex: '^(<|"(gtest|gmock|isl|json)/)'
+    Priority: 3
+    SortPriority: 0
+    CaseSensitive: false
+  - Regex: '.*'
+    Priority: 1
+    SortPriority: 0
+    CaseSensitive: false
+IncludeIsMainRegex: '(Test)?$'
+IncludeIsMainSourceRegex: ''
+IndentAccessModifiers: false
+IndentCaseBlocks: false
+IndentCaseLabels: true
+IndentExternBlock: AfterExternBlock
+IndentGotoLabels: true
+IndentPPDirectives: AfterHash
+IndentRequiresClause: true
+IndentWidth: 4
+IndentWrappedFunctionNames: false
+InsertBraces: false
+InsertNewlineAtEOF: false
+InsertTrailingCommas: None
+IntegerLiteralSeparator:
+  Binary: 0
+  BinaryMinDigits: 0
+  Decimal: 0
+  DecimalMinDigits: 0
+  Hex: 0
+  HexMinDigits: 0
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: true
+KeepEmptyLinesAtEOF: false
+LambdaBodyIndentation: Signature
+LineEnding: DeriveLF
+MacroBlockBegin: ''
+MacroBlockEnd: ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBinPackProtocolList: Auto
+ObjCBlockIndentWidth: 4
+ObjCBreakBeforeNestedBlockParam: true
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PackConstructorInitializers: BinPack
+PenaltyBreakAssignment: 4
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 1000000000
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakOpenParenthesis: 0
+PenaltyBreakScopeResolution: 500
+PenaltyBreakString: 1000
+PenaltyBreakTemplateDeclaration: 10
+PenaltyExcessCharacter: 1000000
+PenaltyIndentedWhitespace: 0
+PenaltyReturnTypeOnItsOwnLine: 60
+PointerAlignment: Right
+PPIndentWidth: 1
+QualifierAlignment: Leave
+ReferenceAlignment: Pointer
+ReflowComments: false
+RemoveBracesLLVM: false
+RemoveParentheses: Leave
+RemoveSemicolon: false
+RequiresClausePosition: OwnLine
+RequiresExpressionIndentation: OuterScope
+SeparateDefinitionBlocks: Leave
+ShortNamespaceLines: 1
+SkipMacroDefinitionBody: false
+SortIncludes: CaseSensitive
+SortJavaStaticImport: Before
+SortUsingDeclarations: LexicographicNumeric
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: true
+SpaceAroundPointerQualifiers: Default
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCaseColon: false
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeJsonColon: false
+SpaceBeforeParens: ControlStatementsExceptControlMacros 
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceBeforeSquareBrackets: false
+SpaceInEmptyBlock: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: Never
+SpacesInContainerLiterals: true
+SpacesInLineCommentPrefix:
+  Minimum: 1
+  Maximum: -1
+SpacesInParens: Never
+SpacesInParensOptions:
+  InCStyleCasts: false
+  InConditionalStatements: false
+  InEmptyParentheses: false
+  Other: false
+SpacesInSquareBrackets: false
+Standard: c++03
+TabWidth: 8
+UseTab: Never
+VerilogBreakBetweenInstancePorts: true
+WhitespaceSensitiveMacros:
+  - BOOST_PP_STRINGIZE
+  - CF_SWIFT_NAME
+  - NS_SWIFT_NAME
+  - PP_STRINGIZE
+  - STRINGIZE
+
+# Taken from:
+#   git grep '^#define *FOR_*' src | cut -d':' -f2 | grep -o '[A-Z]*_.*(' \
+#   | tr -d '(' | LC_ALL=C sort -u
+ForEachMacros:
+  - 'FOR_ALL_AUTOCMD_PATTERNS'
+  - 'FOR_ALL_BUFFERS'
+  - 'FOR_ALL_BUFS_FROM_LAST'
+  - 'FOR_ALL_BUF_WININFO'
+  - 'FOR_ALL_CHANNELS'
+  - 'FOR_ALL_CHILD_MENUS'
+  - 'FOR_ALL_DIFFBLOCKS_IN_TAB'
+  - 'FOR_ALL_FRAMES'
+  - 'FOR_ALL_HASHTAB_ITEMS'
+  - 'FOR_ALL_JOBS'
+  - 'FOR_ALL_LIST_ITEMS'
+  - 'FOR_ALL_MENUS'
+  - 'FOR_ALL_NODE_SIBLINGS'
+  - 'FOR_ALL_POPUPWINS'
+  - 'FOR_ALL_POPUPWINS_IN_TAB'
+  - 'FOR_ALL_QFL_ITEMS'
+  - 'FOR_ALL_SIGNS'
+  - 'FOR_ALL_SIGNS_IN_BUF'
+  - 'FOR_ALL_SPELL_LANGS'
+  - 'FOR_ALL_SYNSTATES'
+  - 'FOR_ALL_TABPAGES'
+  - 'FOR_ALL_TAB_WINDOWS'
+  - 'FOR_ALL_TERMS'
+  - 'FOR_ALL_TIMERS'
+  - 'FOR_ALL_WATCHERS'
+  - 'FOR_ALL_WINDOWS'
+  - 'FOR_ALL_WINDOWS_IN_TAB'
+...