commits-since-last-production-deploy.sh

#!/bin/bash

help() {
  echo "Usage: ./bin/commits-since-last-production-deploy [-a myapp ] [ -h ]"
  exit 2
}

if ! command -v heroku &>/dev/null; then
  echo "Install 'heroku' CLI"
  exit 1
fi

if ! command -v jq &>/dev/null; then
  echo "Install 'jq' CLI"
  exit 1
fi

while getopts 'a:h' opt; do
  case "$1" in
  -a)
    appname="$2"
    shift 2
    ;;
  -h | --help)
    help
    exit 2
    ;;
  esac
done

last_deploy_result=$(heroku releases ${appname:+-a $appname} --json | jq -r ".[0].description")

if [[ $last_deploy_result =~ ^(Deploy (.*)) ]]; then
  sha="${BASH_REMATCH[2]}"
  git log "$sha"..HEAD "$@"
else
  echo "Last deploy to production did not succeed"
  echo "--> $last_deploy_result"
  exit 1
fi