yamllint yaml files on GIT pre-commit hook script

yamllint-pre-commit.bash

#!/usr/bin/env bash
# To be copied in .git/hooks/pre-commit (0755 mode)
if git rev-parse --verify HEAD >/dev/null 2>&1
then
	against=HEAD
else
	# Initial commit: diff against an empty tree object
	against=$(git hash-object -t tree /dev/null)
fi

# Redirect output to stderr.
exec 1>&2

ret=0
set -x

CHANGED_FILES=($(git diff --cached --name-only --diff-filter=ACM "${against}"))

for yaml in ${CHANGED_FILES[*]};do
    [[ ${yaml} =~ .y(a)?ml$ ]] || continue
    yamllint --no-warnings -s -f colored "${yaml}"
    [[ ${ret} == 0 && $? != 0 ]] && ret=$?
done

for shscript in ${CHANGED_FILES[*]};do
    if file "$shscript"|grep -qw "shell script";then
        shellcheck -S error "$shscript"
        [[ ${ret} == 0 && $? != 0 ]] && ret=$?
    fi
done

exit ${ret}