Git Update Hook for running ESLint on updated files

update

#!/bin/bash

EXIT_CODE=0

REFNAME="$1"
OLDREV="$2"
NEWREV="$3"

# find file which have been Added, Copied, Modified or Renamed
UPDATED=`git diff-tree --diff-filter=ACMR --name-only $OLDREV $NEWREV | grep -e '\.js$'`

echo "------------------------------------------------------------------------"
echo "Files to Lint:"
echo "------------------------------------------------------------------------"
echo "$UPDATED"
echo "------------------------------------------------------------------------"
echo
echo "------> Linting....."
echo
echo

# make tmp dir
TMP_DIR=`mktemp -d`

ESLINTRC=$TMP_DIR/.eslintc

# extract .eslintrc file
git cat-file blob $NEWREV:.eslintrc > $ESLINTRC

# extract all updated files
for FILE in $UPDATED;
do
  FILE_PATH=`dirname $FILE`

  FULL_PATH=$TMP_DIR/$FILE_PATH

  mkdir -p $FULL_PATH

  git cat-file blob $NEWREV:$FILE > $TMP_DIR/$FILE
done

# Run ESLint
eslint $TMP_DIR
EXIT_CODE=$?

# Cleanup
rm -rf $TMP_DIR

echo
echo
echo "DONE"

exit $EXIT_CODE