Add .clang-format to enforce project style (pytorch#204)

* Add .clang-format to enforce project style

The settings here match the current settings for the pytorch/pytorch
project, with the exception that 8-character-width tabs are preferred in
place of spaces.

* Mass reformat of all .c and .h files

Now that we have a clang-format file defined, clean up all usages once.

* Enable clang-format-check workflow

Enforce clang-format consistency on all new changes.

.clang-format

@@ -0,0 +1,85 @@
+---
+AccessModifierOffset: -1
+AlignAfterOpenBracket: AlwaysBreak
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlinesLeft: true
+AlignOperands:   false
+AlignTrailingComments: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: true
+AlwaysBreakTemplateDeclarations: true
+BinPackArguments: false
+BinPackParameters: false
+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
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: false
+ColumnLimit:     120
+CommentPragmas:  '^ IWYU pragma:'
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ConstructorInitializerIndentWidth: 8
+ContinuationIndentWidth: 8
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+DisableFormat:   false
+ForEachMacros:   [ FOR_EACH_RANGE, FOR_EACH, ]
+IncludeCategories:
+  - Regex:           '^<.*\.h(pp)?>'
+    Priority:        1
+  - Regex:           '^<.*'
+    Priority:        2
+  - Regex:           '.*'
+    Priority:        3
+IndentCaseLabels: true
+IndentWidth:     8
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+PenaltyBreakBeforeFirstCallParameter: 1
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 2000000
+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:        8
+UseTab:          Always
+---

.github/workflows/clang-format-check.yml

@@ -0,0 +1,12 @@
+name: clang-format
+on: [push, pull_request]
+jobs:
+  formatting-check:
+    name: Formatting Check
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Run clang-format style check.
+      uses: jidicula/[email protected]
+      with:
+        exclude-regex: 'deps\/'

bench/get-current.cc

@@ -2,7 +2,6 @@
 
 #include <cpuinfo.h>
 
-
 static void cpuinfo_get_current_processor(benchmark::State& state) {
 	cpuinfo_initialize();
 	while (state.KeepRunning()) {

bench/init.cc

@@ -2,7 +2,6 @@
 
 #include <cpuinfo.h>
 
-
 static void cpuinfo_initialize(benchmark::State& state) {
 	while (state.KeepRunning()) {
 		cpuinfo_initialize();

include/cpuinfo-mock.h

@@ -7,37 +7,35 @@
 
 #include <cpuinfo.h>
 #if defined(__linux__)
-	#include <sys/types.h>
+#include <sys/types.h>
 #endif
 
 #if !defined(CPUINFO_MOCK) || !(CPUINFO_MOCK)
-	#error This header is intended only for test use
+#error This header is intended only for test use
 #endif
 
-
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-
 #if CPUINFO_ARCH_ARM
-	void CPUINFO_ABI cpuinfo_set_fpsid(uint32_t fpsid);
-	void CPUINFO_ABI cpuinfo_set_wcid(uint32_t wcid);
+void CPUINFO_ABI cpuinfo_set_fpsid(uint32_t fpsid);
+void CPUINFO_ABI cpuinfo_set_wcid(uint32_t wcid);
 #endif /* CPUINFO_ARCH_ARM */
 
 #if CPUINFO_ARCH_X86 || CPUINFO_ARCH_X86_64
-	struct cpuinfo_mock_cpuid {
-		uint32_t input_eax;
-		uint32_t input_ecx;
-		uint32_t eax;
-		uint32_t ebx;
-		uint32_t ecx;
-		uint32_t edx;
-	};
+struct cpuinfo_mock_cpuid {
+	uint32_t input_eax;
+	uint32_t input_ecx;
+	uint32_t eax;
+	uint32_t ebx;
+	uint32_t ecx;
+	uint32_t edx;
+};
 
-	void CPUINFO_ABI cpuinfo_mock_set_cpuid(struct cpuinfo_mock_cpuid* dump, size_t entries);
-	void CPUINFO_ABI cpuinfo_mock_get_cpuid(uint32_t eax, uint32_t regs[4]);
-	void CPUINFO_ABI cpuinfo_mock_get_cpuidex(uint32_t eax, uint32_t ecx, uint32_t regs[4]);
+void CPUINFO_ABI cpuinfo_mock_set_cpuid(struct cpuinfo_mock_cpuid* dump, size_t entries);
+void CPUINFO_ABI cpuinfo_mock_get_cpuid(uint32_t eax, uint32_t regs[4]);
+void CPUINFO_ABI cpuinfo_mock_get_cpuidex(uint32_t eax, uint32_t ecx, uint32_t regs[4]);
 #endif /* CPUINFO_ARCH_X86 || CPUINFO_ARCH_X86_64 */
 
 struct cpuinfo_mock_file {
@@ -53,22 +51,22 @@ struct cpuinfo_mock_property {
 };
 
 #if defined(__linux__)
-	void CPUINFO_ABI cpuinfo_mock_filesystem(struct cpuinfo_mock_file* files);
-	int CPUINFO_ABI cpuinfo_mock_open(const char* path, int oflag);
-	int CPUINFO_ABI cpuinfo_mock_close(int fd);
-	ssize_t CPUINFO_ABI cpuinfo_mock_read(int fd, void* buffer, size_t capacity);
+void CPUINFO_ABI cpuinfo_mock_filesystem(struct cpuinfo_mock_file* files);
+int CPUINFO_ABI cpuinfo_mock_open(const char* path, int oflag);
+int CPUINFO_ABI cpuinfo_mock_close(int fd);
+ssize_t CPUINFO_ABI cpuinfo_mock_read(int fd, void* buffer, size_t capacity);
 
-	#if CPUINFO_ARCH_ARM || CPUINFO_ARCH_ARM64
-		void CPUINFO_ABI cpuinfo_set_hwcap(uint32_t hwcap);
-	#endif
-	#if CPUINFO_ARCH_ARM
-		void CPUINFO_ABI cpuinfo_set_hwcap2(uint32_t hwcap2);
-	#endif
+#if CPUINFO_ARCH_ARM || CPUINFO_ARCH_ARM64
+void CPUINFO_ABI cpuinfo_set_hwcap(uint32_t hwcap);
+#endif
+#if CPUINFO_ARCH_ARM
+void CPUINFO_ABI cpuinfo_set_hwcap2(uint32_t hwcap2);
+#endif
 #endif
 
 #if defined(__ANDROID__)
-	void CPUINFO_ABI cpuinfo_mock_android_properties(struct cpuinfo_mock_property* properties);
-	void CPUINFO_ABI cpuinfo_mock_gl_renderer(const char* renderer);
+void CPUINFO_ABI cpuinfo_mock_android_properties(struct cpuinfo_mock_property* properties);
+void CPUINFO_ABI cpuinfo_mock_gl_renderer(const char* renderer);
 #endif
 
 #ifdef __cplusplus