fast-eslint

#!/bin/bash -e

# option parsing.
FAST_ESLINT=0
ALLOW_WARNINGS=0
ESLINT_VERBOSE=0
OPTIND=1         # Reset in case getopts has been used previously in the shell.
while getopts ":fvw" opt; do
    case "$opt" in
    v)  ESLINT_VERBOSE=1
        ;;
    f)  FAST_ESLINT=1
        ;;
    w)  ALLOW_WARNINGS=1
        ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
      ;;
    esac
done


# Use git to find src root. Jump to script dir to ensure we start in our repo.
cd "$( dirname "${BASH_SOURCE[0]}" )"

SRC_DIR="$(git rev-parse --show-toplevel)"
cd "${SRC_DIR}"

export PATH="${SRC_DIR}/node_modules/.bin:$PATH"

if [[ $ESLINT_VERBOSE -eq 1 ]]; then
    export DEBUG='eslint:cli-engine'
fi

ESLINT_CMD='eslint --ext .jsx,.js --cache'
if [[ $ALLOW_WARNINGS -eq 0 ]]; then
    ESLINT_CMD+=' --max-warnings=0'
fi


# DO IT.
if [[ $FAST_ESLINT -ne 1 ]]; then
    exec ${ESLINT_CMD} .
else
    ANCESTOR=$(git merge-base HEAD refs/removes/origin/master)
    cat <(git ls-files --others --exclude-standard -z -- '*.js' '*.jsx') \
        <(git diff --diff-filter='AM' --name-only --no-renames --no-color -z \
          $ANCESTOR -- '*.js' '*.jsx') \
        | sort -uz \
        | xargs -0 ${ESLINT_CMD}
fi