#!/bin/bash

# --- Command line
refname="$1"
oldrev="$2"
newrev="$3"
branch=${refname#refs/heads/}

# Make a temp directory for writing the .jshintrc file
TMP_DIR=`mktemp -d`
EXIT_CODE=0

# If commit was on the master branch
if [ "$branch" == "master" ]
then
  # See if the git repo has a .jshintrc file
  JSHINTRC=`git ls-tree --full-tree --name-only -r HEAD -- | egrep .jshintrc`

  JSHINT="jshint"
  if [ -n "$JSHINTRC" ]
  then
    # Create a path to a temp .jshintrc file
    JSHINTRC_FILE="$TMP_DIR/`basename \"$JSHINTRC\"`"

    # Write the repo file to the temp location
    git cat-file blob HEAD:$JSHINTRC > $JSHINTRC_FILE

    # Update the JSHint command to use the configuration file
    JSHINT="$JSHINT --config=$JSHINTRC_TMP_DIR/$JSHINTRC"
  fi

  # Check all of the .js files that changed between oldrev and newrev
  for FILE in `git diff --name-only -r ${oldrev} ${newrev} -- | egrep *.js`; do
    # Get just the path of the file
    FILE_PATH=`dirname ${FILE}`

    # Join that with the tmp directory; make if it does not exist
    FULL_PATH=${TMP_DIR}/${FILE_PATH}
    mkdir -p ${FULL_PATH}

    # Write the file from Git
    git cat-file blob ${newrev}:${FILE} > "$TMP_DIR/$FILE"

    # Run JSHint on the file and redirect the output back to Git
    ${JSHINT} ${TMP_DIR}/${FILE} >&2

    # Capture the exit status of last command
    EXIT_CODE=$((${EXIT_CODE} + $?))

    # If the EXIT_CODE is not 0 fail
    if [[ $EXIT_CODE -ne 0 ]]
    then
      rm -rf ${TMP_DIR}
      exit $EXIT_CODE
    fi
  done

  # Clean-up the created files
  rm -rf ${TMP_DIR}
fi

# Not updating master
exit 0