Clang Format file and script

Adds paths to ignore to clang-format, .clang-format file.
Also a wrapper script to clang-format to read .clang-format-ignore.

To format the whole tree at the root of the repository run:
`find . -iname '*.h' -o -iname '*.cpp' -exec python3 Scripts/clang-format.py -i \{\} \;`

.clang-format

@@ -0,0 +1,109 @@
+Language: Cpp
+BasedOnStyle: WebKit
+AccessModifierOffset: -2
+AlignAfterOpenBracket: Align
+AlignArrayOfStructures: None
+AlignConsecutiveAssignments: None
+AlignConsecutiveBitFields: Consecutive
+AlignConsecutiveDeclarations: None
+AlignConsecutiveMacros: None
+AlignEscapedNewlines: DontAlign
+AlignOperands: Align
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortCaseLabelsOnASingleLine: true
+AllowShortEnumsOnASingleLine: true
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: WithoutElse
+AllowShortLambdasOnASingleLine: Inline
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: true
+AttributeMacros:
+  - JEMALLOC_NOTHROW
+  - FEX_ALIGNED
+  - FEX_ANNOTATE
+  - FEX_DEFAULT_VISIBILITY
+  - FEX_NAKED 
+  - FEX_PACKED
+  - FEXCORE_PRESERVE_ALL_ATTR
+  - GLIBC_ALIAS_FUNCTION
+BinPackArguments: true
+BinPackParameters: true
+BitFieldColonSpacing: Both
+BreakAfterAttributes: Always # clang 16 required
+BreakBeforeBraces: Attach
+BreakBeforeBinaryOperators: None
+BreakBeforeInlineASMColon: OnlyMultiline # clang 16 required
+BreakBeforeTernaryOperators: false
+BreakConstructorInitializers: BeforeComma
+BreakInheritanceList: BeforeColon
+ColumnLimit: 140
+CompactNamespaces: false
+ConstructorInitializerIndentWidth: 2
+ContinuationIndentWidth: 2
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+EmptyLineAfterAccessModifier: Leave
+EmptyLineBeforeAccessModifier: Leave
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
+IncludeBlocks: Preserve
+IndentAccessModifiers: false
+IndentCaseBlocks: false
+IndentCaseLabels: false
+IndentExternBlock: AfterExternBlock
+IndentGotoLabels: false
+IndentPPDirectives: None
+IndentRequires: false
+IndentWidth: 2
+InsertBraces: true
+KeepEmptyLinesAtTheStartOfBlocks: true
+LambdaBodyIndentation: OuterScope
+LineEnding: LF # clang 16 required
+MaxEmptyLinesToKeep: 2
+NamespaceIndentation: Inner
+QualifierAlignment: Left
+PackConstructorInitializers: Never
+PenaltyBreakAssignment: 2
+PenaltyBreakBeforeFirstCallParameter: 2
+PenaltyBreakOpenParenthesis: 2
+PenaltyBreakString: 10
+PenaltyBreakTemplateDeclaration: 8
+PenaltyExcessCharacter: 2
+PenaltyReturnTypeOnItsOwnLine: 16
+PointerAlignment: Left
+RemoveBracesLLVM: false
+ReferenceAlignment: Left
+ReflowComments: true
+RequiresClausePosition: WithPreceding
+SeparateDefinitionBlocks: Leave
+SortIncludes: Never
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: false
+SpaceAroundPointerQualifiers: Default
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCaseColon: false
+SpaceBeforeCpp11BracedList: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: Custom
+SpaceBeforeParensOptions:
+  AfterControlStatements: true
+  AfterFunctionDeclarationName: false
+  AfterFunctionDefinitionName: false
+  AfterOverloadedOperator: false
+  AfterRequiresInClause: true
+  BeforeNonEmptyParentheses: false
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceBeforeSquareBrackets: false
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: Leave
+SpacesInCStyleCastParentheses: false
+SpacesInConditionalStatement: false
+SpacesInParentheses: false
+Standard: c++20
+UseTab: Never

.clang-format-ignore

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+# This file is used to ignore files and directories from clang-format
+
+# Ignore build folder
+build/*
+
+# Ignore all files in the External directory
+External/*
+
+# SoftFloat-3e code doesn't belong to us 
+FEXCore/Source/Common/SoftFloat-3e/*
+Source/Common/cpp-optparse/*
+
+# Files with human-indented tables for readability - don't mess with these
+FEXCore/Source/Interface/Core/X86Tables/X87Tables.cpp
+FEXCore/Source/Interface/Core/X86Tables/XOPTables.cpp
+FEXCore/Source/Interface/Core/X86Tables/*
+

Scripts/clang-format.py

@@ -0,0 +1,70 @@
+import subprocess
+import sys
+import os
+import re
+import fnmatch
+
+# Wrapper globals
+project_root = os.path.join(os.path.dirname(os.path.realpath(__file__)), "..")
+ignore_file_path = os.path.join(project_root, ".clang-format-ignore")
+clang_format_command = "clang-format"
+
+
+def glob_to_regex(pattern):
+    # Normalize directory separators
+    pattern = pattern.replace("\\", "/")
+    return fnmatch.translate(pattern)
+
+
+def load_ignore_patterns(ignore_file_path):
+    with open(ignore_file_path, "r") as file:
+        lines = file.readlines()
+
+    patterns = []
+    for line in lines:
+        line = line.strip()
+        if line and not line.startswith("#"):  # Ignore empty lines and comments
+            pattern = glob_to_regex(line)
+            patterns.append(re.compile(pattern))
+    return patterns
+
+
+def normalize_path(file_path):
+    absolute_path = os.path.abspath(file_path)
+    normalized_path = absolute_path.replace("\\", "/")
+    return normalized_path
+
+
+def should_ignore(file_path, ignore_patterns):
+    normalized_path = normalize_path(file_path)
+    relative_path = os.path.relpath(normalized_path, start=project_root).replace(
+        "\\", "/"
+    )
+    for pattern in ignore_patterns:
+        if pattern.match(relative_path):
+            return True
+    return False
+
+
+def find_valid_file_paths(args):
+    return [arg for arg in args if os.path.isfile(arg)]
+
+
+def main():
+    ignore_patterns = load_ignore_patterns(ignore_file_path)
+    valid_paths = find_valid_file_paths(sys.argv[1:])
+
+    if len(valid_paths) != 1:
+        print("Error: Expected exactly one valid file path as argument.")
+        sys.exit(1)
+
+    file_path = valid_paths[0]
+    if should_ignore(file_path, ignore_patterns):
+        print(f"Ignoring {file_path} based on ignore patterns.")
+        return
+
+    subprocess.run([clang_format_command] + sys.argv[1:], check=True)
+
+
+if __name__ == "__main__":
+    main()