#!/bin/bash

# use as .git/hooks/pre-commit

function vercomp () {
    if [[ $1 == $2 ]]
    then
        return 0
    fi
    local IFS=.
    local i ver1=($1) ver2=($2)
    # fill empty fields in ver1 with zeros
    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
    do
        ver1[i]=0
    done
    for ((i=0; i<${#ver1[@]}; i++))
    do
        if [[ -z ${ver2[i]} ]]
        then
            # fill empty fields in ver2 with zeros
            ver2[i]=0
        fi
        if ((10#${ver1[i]} > 10#${ver2[i]}))
        then
            return 1
        fi
        if ((10#${ver1[i]} < 10#${ver2[i]}))
        then
            return 2
        fi
    done
    return 0
}

exec 1>&2

if ! uncrustify --version > /dev/null
then
    echo 'uncrustify required'
    exit 1
fi

HAVE=$(uncrustify --version | sed -e 's/.*-//' -e 's/_.//')

vercomp 0.78.0 "$HAVE"
case $? in
    0)
    ;;
    1)
        echo "your uncrustify is too old";
        exit 1
        ;;
    2)
        ;;
esac

RET=0
changed=$(git diff --cached --name-only)
crustified=""

for f in $changed;
do
 if echo $f | grep \\.[c,h]\$ > /dev/null
 then
    # compare result of uncrustify with changes
    #
    # only change any of the invocations here if
    # they are portable across all cmp and shell
    # implementations !
    uncrustify -q -c uncrustify.cfg -f $f | cmp -s $f -
    if test $? = 1 ;
    then
      crustified=" $crustified $f"
      RET=1
    fi
  fi
done

if [ $RET = 1 ];
then
  echo "Run"
  echo "uncrustify --no-backup -c uncrustify.cfg ${crustified}"
  echo "before committing."
fi
exit $RET