main.sh

#!/usr/bin/env bash

INPUT_BASE_DIR=$1
INPUT_DIFF_FILTER=$2

if [ "${GITHUB_EVENT_NAME}" == "pull_request" ]; then
  BASE_REF=$(git rev-parse origin/${GITHUB_BASE_REF})
  HEAD_REF=$(git rev-parse HEAD)
elif  [ "${GITHUB_EVENT_NAME}" == "push" ]; then
  BASE_REF=HEAD
  HEAD_REF="HEAD^"
else
  echo "TheProjectAurora/diff-filter action supports only 'pull_request' and 'commit' events." >> ${GITHUB_OUTPUT}
  BASE_REF=HEAD
  HEAD_REF=HEAD
fi

AOUTPUT_TMP=$(
  git \
    --no-pager \
    diff \
    --name-only \
    --diff-filter=${INPUT_DIFF_FILTER} \
    ${BASE_REF} \
    ${HEAD_REF} | \
  grep ^${INPUT_BASE_DIR} | \
  xargs -n 1 dirname | \
  awk -F/ '{print $2}' | \
  sort | \
  uniq | \
  jq --raw-input . | \
  jq --slurp . | \
  tr -d "\ \n\r"
)

echo "dirs=${AOUTPUT_TMP}">>${GITHUB_OUTPUT}