#!/bin/sh
#
# Check that the code follows the coding style
#
# If the code does not follow the coding style a warning will be printed.
#

version=`gnuindent --version 2> /dev/null`
if [ "x$version" = "x" ]; then
    version=`indent --version 2> /dev/null`
    if [ "x$version" = "x" ] || [[ "$version" != *GNU* ]]; then
        echo "Git pre-commit hook:"
        echo "Did not find GNU indent, please install it before continuing."
        exit 1
    fi
    INDENT=indent
else
    INDENT=gnuindent
fi

echo "*******************"

for file in `git diff-index --cached --name-only HEAD --diff-filter=ACMR`; do
    ext=$(expr "$file" : ".*\(\..*\)")
    case $ext in
        .c|.h)
            echo "Checking code style"
            # ckfile is the temporary checkout and we indent it
            ckfile=`git checkout-index --temp ${file} | cut -f 1`
            newfile=`mktemp /tmp/${ckfile}.XXXXXX` || exit 1
            $INDENT $ckfile -o $newfile 2>> /dev/null
            $INDENT $newfile 2>> /dev/null
            diff -u -p "${ckfile}" "${newfile}"
            r=$?
            rm "${ckfile}"
            rm "${newfile}"
            rm "${newfile}~"
            if [ $r != 0 ]; then
                echo "Warning: Code style error in $file"
                read -n1 -p "Do you want to CONTINUE committing? [Y/n]" opt < /dev/tty
                case $opt in
                    n|N)
                        echo
                        exit 1
                        ;;
                    *)
                        ;;
                esac
                echo "*******************"
            fi
            exit 0
            ;;
        *)
            echo "Not checking code style for this type of file"
            echo "*******************"
            ;;
    esac
done