[libcamera-devel] [PATCH v2 1/2] libcamera: Add clang-format style

[Kieran Bingham]

Hi Laurent,

On 21/01/2019 18:01, Laurent Pinchart wrote:
> The initial clang-format options are copied from the Linux kernel style,
> with the following differences:
> 
> - Use C++11
> - Remove the line length limit (to keep the original line breaks)
> - Don't indent access modifiers
> - Allow short inline functions on a single line
> - Move braces to next line after class definition
> - Keep braces on the line of the namespace definition
> - Replace for-each macros
> 

I approve of this - it gives us so much more control than astyle...

I've done some initial testing, putting this through my branches - and
it gives good results. Some things are picked up which aren't picked up
by astyle, which is to be expected.

for example, spaces are now added between while and (), which I actually
think is reasonable:

                timeout.start(5000);
-               while(timeout.isRunning()) {
+               while (timeout.isRunning()) {
                        dispatcher->processEvents();

Especially as it picked up this:

-       while( ioctl(fd_, VIDIOC_ENUM_FMT, &fmt) == 0 ) {
+       while (ioctl(fd_, VIDIOC_ENUM_FMT, &fmt) == 0) {

which looks nicer.


Initialiser lists are forced to a new line, which might be ok, but also
note that hugging of the empty function ... I might have left that space
in there at least...


-       CaptureAsync() : frames(0) {};
+       CaptureAsync()
+               : frames(0){};


Hugging of casts (I like this one too),

I think we can adapt things as we go along though rather than stall this.

Ship it! The sooner this goes in the easier it will be to migrate.

Acked-by: Kieran Bingham <kieran.bingham at ideasonboard.com>

> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> ---
>  .clang-format | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 119 insertions(+)
>  create mode 100644 .clang-format
> 
> diff --git a/.clang-format b/.clang-format
> new file mode 100644
> index 000000000000..17eb095bde71
> --- /dev/null
> +++ b/.clang-format
> @@ -0,0 +1,119 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# clang-format configuration file. Intended for clang-format >= 4.
> +#
> +# For more information, see:
> +#
> +#   Documentation/process/clang-format.rst
> +#   https://clang.llvm.org/docs/ClangFormat.html
> +#   https://clang.llvm.org/docs/ClangFormatStyleOptions.html
> +#
> +---
> +AccessModifierOffset: -8
> +AlignAfterOpenBracket: Align
> +AlignConsecutiveAssignments: false
> +AlignConsecutiveDeclarations: false
> +#AlignEscapedNewlines: Left # Unknown to clang-format-4.0
> +AlignOperands: true
> +AlignTrailingComments: false
> +AllowAllParametersOfDeclarationOnNextLine: false
> +AllowShortBlocksOnASingleLine: false
> +AllowShortCaseLabelsOnASingleLine: false
> +AllowShortFunctionsOnASingleLine: Inline
> +AllowShortIfStatementsOnASingleLine: false
> +AllowShortLoopsOnASingleLine: false
> +AlwaysBreakAfterDefinitionReturnType: None
> +AlwaysBreakAfterReturnType: None
> +AlwaysBreakBeforeMultilineStrings: false
> +AlwaysBreakTemplateDeclarations: false
> +BinPackArguments: true
> +BinPackParameters: true
> +BraceWrapping:
> +  AfterClass: true
> +  AfterControlStatement: false
> +  AfterEnum: false
> +  AfterFunction: true
> +  AfterNamespace: false
> +  AfterObjCDeclaration: false
> +  AfterStruct: false
> +  AfterUnion: false
> +  #AfterExternBlock: false # Unknown to clang-format-5.0
> +  BeforeCatch: false
> +  BeforeElse: false
> +  IndentBraces: false
> +  #SplitEmptyFunction: true # Unknown to clang-format-4.0
> +  #SplitEmptyRecord: true # Unknown to clang-format-4.0
> +  #SplitEmptyNamespace: true # Unknown to clang-format-4.0
> +BreakBeforeBinaryOperators: None
> +BreakBeforeBraces: Custom
> +#BreakBeforeInheritanceComma: false # Unknown to clang-format-4.0
> +BreakBeforeTernaryOperators: false
> +BreakConstructorInitializersBeforeComma: false
> +#BreakConstructorInitializers: BeforeComma # Unknown to clang-format-4.0
> +BreakAfterJavaFieldAnnotations: false
> +BreakStringLiterals: false
> +ColumnLimit: 0
> +CommentPragmas: '^ IWYU pragma:'
> +#CompactNamespaces: false # Unknown to clang-format-4.0
> +ConstructorInitializerAllOnOneLineOrOnePerLine: false
> +ConstructorInitializerIndentWidth: 8
> +ContinuationIndentWidth: 8
> +Cpp11BracedListStyle: false
> +DerivePointerAlignment: false
> +DisableFormat: false
> +ExperimentalAutoDetectBinPacking: false
> +#FixNamespaceComments: false # Unknown to clang-format-4.0
> +ForEachMacros:
> +  - 'udev_list_entry_foreach'
> +#IncludeBlocks: Preserve # Unknown to clang-format-5.0
> +IncludeCategories:
> +  - Regex: '.*'
> +    Priority: 1
> +IncludeIsMainRegex: '(_test)?$'
> +IndentCaseLabels: false
> +#IndentPPDirectives: None # Unknown to clang-format-5.0
> +IndentWidth: 8
> +IndentWrappedFunctionNames: false
> +JavaScriptQuotes: Leave
> +JavaScriptWrapImports: true
> +KeepEmptyLinesAtTheStartOfBlocks: false
> +MacroBlockBegin: ''
> +MacroBlockEnd: ''
> +MaxEmptyLinesToKeep: 1
> +NamespaceIndentation: Inner
> +#ObjCBinPackProtocolList: Auto # Unknown to clang-format-5.0
> +ObjCBlockIndentWidth: 8
> +ObjCSpaceAfterProperty: true
> +ObjCSpaceBeforeProtocolList: true
> +
> +# Taken from git's rules
> +#PenaltyBreakAssignment: 10 # Unknown to clang-format-4.0
> +PenaltyBreakBeforeFirstCallParameter: 30
> +PenaltyBreakComment: 10
> +PenaltyBreakFirstLessLess: 0
> +PenaltyBreakString: 10
> +PenaltyExcessCharacter: 100
> +PenaltyReturnTypeOnItsOwnLine: 60
> +
> +PointerAlignment: Right
> +ReflowComments: false
> +SortIncludes: false
> +#SortUsingDeclarations: false # Unknown to clang-format-4.0
> +SpaceAfterCStyleCast: false
> +SpaceAfterTemplateKeyword: true
> +SpaceBeforeAssignmentOperators: true
> +#SpaceBeforeCtorInitializerColon: true # Unknown to clang-format-5.0
> +#SpaceBeforeInheritanceColon: true # Unknown to clang-format-5.0
> +SpaceBeforeParens: ControlStatements
> +#SpaceBeforeRangeBasedForLoopColon: true # Unknown to clang-format-5.0
> +SpaceInEmptyParentheses: false
> +SpacesBeforeTrailingComments: 1
> +SpacesInAngles: false
> +SpacesInContainerLiterals: false
> +SpacesInCStyleCastParentheses: false
> +SpacesInParentheses: false
> +SpacesInSquareBrackets: false
> +Standard: Cpp11
> +TabWidth: 8
> +UseTab: Always
> +...
> 

-- 
Regards
--
Kieran