Pre-commit script for JSHint

jshint-pre-commit

#!/bin/bash
# author: jishnu7@gmail.com
# Pre-commit hook passing files through jshint

# Temperory staging area
TMP_STAGING=".tmp_staging"
# absolute path of this repo
ROOT_DIR=$(git rev-parse --show-toplevel)
# path of your jshint config
CONF="--config=${ROOT_DIR}/tools/jshintrc"
# jshint path
JSHINT=$(which jshint)
if git rev-parse --verify HEAD >/dev/null 2>&1
then
  against=HEAD
else
  # If initial commit, diff against an empty tree object
  against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

# retrieve all files in staging area that are added, modified or renamed
FILES=$(git diff-index --name-only --cached --diff-filter=ACMR $against -- | egrep \.js$)
echo $FILES
if [ "$FILES" == "" ]; then
    exit 0
fi

# create temporary copy of staging area
if [ -e $TMP_STAGING ]; then
    rm -rf $TMP_STAGING
fi
mkdir $TMP_STAGING

STAGED_FILES=""
for FILE in $FILES
do
  ID=$(git diff-index --cached HEAD $FILE | cut -d " " -f4)

  # create staged version of file in temporary staging area with the same
  # path as the original file so that the phpcs ignore filters can be applied
  mkdir -p "$TMP_STAGING/$(dirname $FILE)"
  git cat-file blob $ID > "$TMP_STAGING/$FILE"
  STAGED_FILES="$STAGED_FILES $TMP_STAGING/$FILE"
done

for file in $STAGED_FILES; do
  $JSHINT $file ${CONF}
  RETVAL=$?
  if [ $RETVAL -gt 0 ]; then
    break
  else
    echo "jslint passed ${file}"
  fi
done

# delete temporary copy of staging area
rm -rf $TMP_STAGING

if [ $RETVAL -gt 0 ]; then
  exit 1
else
  exit 0
fi