#!/bin/bash

IFS=' '
z40=0000000000000000000000000000000000000000

echo "Perform cpp code linting"
DIR=$(dirname "$(readlink -f "$0")")
LINTER="$DIR/cpplint.py"
while read local_ref local_sha remote_ref remote_sha;
do
    if [ "$local_sha" = $z40 ]; then
        # Handle delete
        continue
    elif [ "$remote_sha" = $z40 ]; then
        # New branch, get upstream branch name
        range=`git rev-parse --abbrev-ref @{u} &>/dev/null`
        if [ $? -ne 0 ]; then
            range="HEAD^"
        fi
    else
        # Update to existing branch
        range="$remote_sha $local_sha"
    fi
    CHANGED_FILES=`git diff --name-only --diff-filter=d $range | grep '\.\(c\|cpp\|h\|hpp\|inl\)$' | grep -v 'deps/'`
    if [ ! -z "$CHANGED_FILES" -a "$CHANGED_FILES" != " " ]; then
        echo $CHANGED_FILES | xargs python3 $LINTER
        RET=$?
        if [ $RET -ne 0 ]; then
            echo "Style check error, please fix them before pushing to the repo."
            exit $RET
        fi
    fi
done