QA: add a git hook script to validate the format & check spu2x format

Note: pre-commit hook is for linux, need to be manually installed in .git/hooks/

A windows solution is welcome

linux_various/check_format.sh

@@ -55,7 +55,6 @@ files=`git diff --name-only --diff-filter=ACMRT $diff_range  -- $PWD | \
     grep -v "${1}plugins/GSdx/" | \
     grep -v "${1}plugins/GSdx_legacy/" | \
     grep -v "${1}plugins/PeopsSPU2/" | \
-    grep -v "${1}plugins/spu2-x/" | \
     grep -v "${1}plugins/SSSPSXPAD/" | \
     grep -v "${1}plugins/USBqemu/" | \
     grep -v "${1}plugins/xpad/" | \

linux_various/pre-commit

@@ -0,0 +1,101 @@
+#!/bin/bash
+
+# git pre-commit hook that runs an clang-format stylecheck.
+# Features:
+#  - abort commit when commit does not comply with the style guidelines
+#  - create a patch of the proposed style changes
+
+# modifications for clang-format by rene.milk@wwu.de
+# This file is part of a set of unofficial pre-commit hooks available
+# at github.
+# Link:    https://github.com/githubbrowser/Pre-commit-hooks
+# Contact: David Martin, david.martin.mailbox@googlemail.com
+
+
+##################################################################
+# SETTINGS
+# set path to clang-format binary
+CLANG_FORMAT="/usr/bin/clang-format"
+
+# remove any older patches from previous commits. Set to true or false.
+DELETE_OLD_PATCHES=false
+
+# only parse files with the extensions in FILE_EXTS. Set to true or false.
+# if false every changed file in the commit will be parsed with clang-format.
+# if true only files matching one of the extensions are parsed with clang-format.
+PARSE_EXTS=true
+
+# file types to parse. Only effective when PARSE_EXTS is true.
+ FILE_EXTS=".c .h .cpp .hpp .inl"
+
+ALLOWED_ROOT_DIR="./plugins/USBnull ./plugins/SPU2null ./plugins/FWnull ./plugins/dev9null ./plugins/GSnull ./plugins/CDVDnull ./plugins/PadNull ./plugins/LilyPad/ ./plugins/onepad/ ./plugins/spu2-x/"
+
+##################################################################
+# There should be no need to change anything below this line.
+
+# exit on error
+set -e
+
+# check whether the given file matches any of the set extensions
+matches_extension() {
+    local filename=$(basename "$1")
+    local extension=".${filename##*.}"
+    local ext
+
+    for ext in $FILE_EXTS; do [[ "$ext" == "$extension" ]] && return 0; done
+
+    return 1
+}
+
+if [ ! -x "$CLANG_FORMAT" ] ; then
+    printf "Error: clang-format executable ($CLANG_FORMAT) not found.\n"
+    printf "Set the correct path in $0.\n"
+    exit 1
+fi
+
+# create a random filename to store our generated patch
+prefix="pre-commit-clang-format"
+suffix="$(date +%s)"
+patch="/tmp/$prefix-${suffix}.patch"
+
+# clean up any older clang-format patches
+$DELETE_OLD_PATCHES && rm -f /tmp/$prefix*.patch
+
+# create one patch containing all changes to the files
+git diff-index --cached --diff-filter=ACMR --name-only HEAD -- $ALLOWED_ROOT_DIR | while read file;
+do
+    # ignore file if we do check for file extensions and the file
+    # does not match any of the extensions specified in $FILE_EXTS
+    if $PARSE_EXTS && ! matches_extension "$file"; then
+        continue;
+    fi
+
+    # clang-format our sourcefile, create a patch with diff and append it to our $patch
+    # The sed call is necessary to transform the patch from
+    #    --- $file timestamp
+    #    +++ - timestamp
+    # to both lines working on the same file and having a a/ and b/ prefix.
+    # Else it can not be applied with 'git apply'.
+    "$CLANG_FORMAT" -style=file "$file" | \
+        diff -u "$file" - | \
+        sed -e "1s|--- |--- a/|" -e "2s|+++ -|+++ b/$file|" >> "$patch"
+done
+
+# if no patch has been generated all is ok, clean up the file stub and exit
+if [ ! -s "$patch" ] ; then
+    printf "Files in this commit comply with the clang-format rules.\n"
+    rm -f "$patch"
+    exit 0
+fi
+
+# a patch has been created, notify the user and exit
+printf "\nThe following differences were found between the code to commit "
+printf "and the clang-format rules:\n\n"
+cat "$patch"
+
+printf "\nYou can apply these changes with:\n git apply $patch\n"
+printf "(may need to be called from the root directory of your repository)\n"
+printf "Aborting commit. Apply changes and commit again or skip checking with"
+printf " --no-verify (not recommended).\n"
+
+exit 1