pre-commit-checkstyle

#!/bin/bash
#
# An example hook script to verify what is about to be committed.
# Called by "git commit" with no arguments.  The hook should
# exit with non-zero status after issuing an appropriate message if
# it wants to stop the commit.
#
# To enable this hook, rename this file to "pre-commit".

# /home/khc/.m2/repository/com/puppycrawl/tools/checkstyle/6.3/checkstyle-6.3.jar:/home/khc/.m2/repository/commons-cli/commons-cli/1.2/commons-cli-1.2.jar 

if git rev-parse --verify HEAD >/dev/null 2>&1
then
	against=HEAD
else
	# Initial commit: diff against an empty tree object
	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

root=$(git rev-parse --show-toplevel)
config=$root/$(git ls-files --full-name | grep checkstyle.xml$)
if [ ! -f $config ]; then
    echo "cannot find checkstyle config!"
    exit 1
fi

copyright=$root/$(git ls-files --full-name | grep copyright_header.txt$)

echo "checking " $(git diff-index --cached --name-only $against -- | grep .java$)

cd $root && java -cp /home/khc/Downloads/checkstyle-6.3-all.jar \
    -Dcheckstyle.header.file=$copyright \
    com.puppycrawl.tools.checkstyle.Main \
    -f plain \
    -c $config \
    $(git diff-index --cached --name-only $against -- | grep .java$) | grep ^/

# grep returns 0 if it found something
if [ $? == 0 ]; then
    exit 1
fi