bash script to save directories with changed files in Travis CICD

identify_changed_dirs.sh

#!/bin/bash
# this script will run in Travis CICD, identify changed files
# and save the directories of the files if a condition is met,
# it will then print the array of matching directories

if [[ "$TRAVIS_EVENT_TYPE" == "push" ]]; then
    # collect only changed files from commit
    files=($(git diff-tree --no-commit-id --name-only -r "$TRAVIS_COMMIT"))
elif [[ "$TRAVIS_EVENT_TYPE" == "pull_request" ]]; then
    # collect all changed files from commit range
    files=($(git diff-tree --no-commit-id --name-only -r origin/main -r "$TRAVIS_COMMIT"))
fi

# create list 
directories=()

for file in "${files[@]}"; do
   parent_dir=$(dirname -- "$file")
   
   # I only want to collect subdirectories under a directory named teams/
   # therefore the condition requires that the path has a directory named teams
   if [[ $parent_dir != "." ]] && [[ $parent_dir == *"teams"* ]]; then
       directories+=("$parent_dir")
   fi
done

if [[ ${#directories[@]} -eq 0 ]]; then
    echo "no matches"
else
    printf "'%s'\n" "${directories[@]}"
fi