#!/bin/bash

# Tests if a CircleCI job run is dealing with changes in the given directory.
# Useful for skipping a job if nothing was updated for a particular component.
# Only should be run in a CircleCI job.

# This compares the current branch to the master, so it might have some false
# positives if using multiple layers of branches off of master.

set -euo pipefail

DIRS=$@

for DIR in $DIRS; do
    if [ $(git diff origin/master...$CIRCLE_BRANCH --name-status | awk '{print $2}' | grep -c "^$DIR") -gt 0 ]; then
        exit 0
    fi
done

exit 1