clang format: preliminary support

Add a .clang-format example file. Might need minor tuning. If people doesn't like the syntax

Add a basic script to validate current change is compliant with clang-format
* on master it will test last 20 commits
* on branch it will test all commits of the branch

Idea is to plug it into travis (might require clang 3.8). Everything is blacklisted. Use "ALL" parameters
to test all standard directories.

.clang-format

@@ -0,0 +1,77 @@
+---
+Language:        Cpp
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: true
+AlignConsecutiveDeclarations: true
+AlignEscapedNewlinesLeft: false
+AlignOperands:   true
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: true
+AllowShortCaseLabelsOnASingleLine: true
+AllowShortFunctionsOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: true
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: true
+BinPackArguments: true
+BinPackParameters: true
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Linux
+BreakBeforeTernaryOperators: false
+BreakConstructorInitializersBeforeComma: true
+ColumnLimit:     0
+CommentPragmas:  '^ (IWYU pragma:|NOLINT)'
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+DisableFormat:   false
+ForEachMacros:   []
+IncludeCategories:
+  - Regex:           '^"(stdafx|PrecompiledHeader)'
+    Priority:        -2
+  - Regex:           '^".*Common'
+    Priority:        -1
+  - Regex:           '^<'
+    Priority:        1
+  - Regex:           '^"'
+    Priority:        2
+IndentCaseLabels: true
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: true
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 3
+NamespaceIndentation: None
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 60
+PointerAlignment: Left
+ReflowComments:  true
+SortIncludes:    false
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 2
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard:        Cpp11
+TabWidth:        4
+UseTab:          Never
+...

linux_various/check_format.sh

@@ -0,0 +1,66 @@
+#!/bin/sh
+
+ret=0
+
+branch=`git rev-parse --abbrev-ref HEAD`
+if [ x$branch = "xmaster" ]
+then
+    # check the last 20 commits. It ought to be enough even for big push
+    diff_range=HEAD~20
+else
+    # check filed updated in the branch
+    diff_range="master...HEAD"
+fi
+
+# get updates and blacklist directories that don't use yet the clang-format syntax
+files=`git diff $diff_range --name-only --diff-filter=ACMRT | \
+    grep "\.\(c\|h\|inl\|cpp\|hpp\)$" | \
+    grep -v "${1}common/" | \
+    grep -v "${1}pcsx2/" | \
+    grep -v "${1}plugins/cdvdGigaherz/" | \
+    grep -v "${1}plugins/CDVDiso/" | \
+    grep -v "${1}plugins/CDVDisoEFP/" | \
+    grep -v "${1}plugins/CDVDlinuz/" | \
+    grep -v "${1}plugins/CDVDnull/" | \
+    grep -v "${1}plugins/CDVDolio/" | \
+    grep -v "${1}plugins/CDVDpeops/" | \
+    grep -v "${1}plugins/dev9ghzdrk/" | \
+    grep -v "${1}plugins/dev9null/" | \
+    grep -v "${1}plugins/FWnull/" | \
+    grep -v "${1}plugins/GSdx/" | \
+    grep -v "${1}plugins/GSdx_legacy/" | \
+    grep -v "${1}plugins/GSnull/" | \
+    grep -v "${1}plugins/LilyPad/" | \
+    grep -v "${1}plugins/onepad/" | \
+    grep -v "${1}plugins/PadNull/" | \
+    grep -v "${1}plugins/PeopsSPU2/" | \
+    grep -v "${1}plugins/SPU2null/" | \
+    grep -v "${1}plugins/spu2-x/" | \
+    grep -v "${1}plugins/SSSPSXPAD/" | \
+    grep -v "${1}plugins/USBnull/" | \
+    grep -v "${1}plugins/USBqemu/" | \
+    grep -v "${1}plugins/xpad/" | \
+    grep -v "${1}plugins/zerogs/" | \
+    grep -v "${1}plugins/zerospu2/" | \
+    grep -v "${1}plugins/zzogl-pg/" | \
+    \
+    grep -v "3rdpary/" | \
+    grep -v "bin/" | \
+    grep -v "cmake/" | \
+    grep -v "tools/" | \
+    grep -v "tests/" | \
+    grep -v "unfree/"
+`
+
+# Check remaining files are clang-format compliant
+for f in $files
+do
+    clang-format -style=file -output-replacements-xml $f | grep "<replacement " >/dev/null
+    if [ $? -ne 1 ]
+    then
+        echo "file $f did not match clang-format"
+        ret=1;
+    fi
+done
+
+exit $ret;