Script for incrementing build iOS app build number before building when multiple versions of the same app need to be released for testing

bump_build_number

#! /usr/bin/env bash

usage() {
  echo Usage:
  echo "$0 <info_plist_file> [<build_number_directory>] [-v]"
  echo "If a build number directory is given, the saved number will be checked,"
  echo "    and if it exists and is greater than the build number in the info plist,"
  echo "    it will be incremented and saved back to the given build number directory."
  echo "If it does not exist, or it is smaller than the info plist build number,"
  echo "    the info plist number will be incremented and saved back."
  echo "If the given directory does not exist, it will be created."
  echo "If no directory is given, the number will be read from the info.plist"
  echo "    and not saved outside of it."
  echo
  echo "If the -v option is used, the build name and number will be printed out upon success"
  echo
  exit ${1:-0}
}

infoplist="${1}"
if [[ "${2}" != "-v" ]]; then
  buildnumberdir="${2}"
else
  verbose=1
fi

if [[ "${3}" = "-v" ]]; then
  verbose=1
fi

if [ ! -f "${infoplist}" ]; then
  usage 1
fi

plistbuddy() {
  plistcommand="$@"
  /usr/libexec/PlistBuddy -c "${plistcommand}" "${infoplist}"
}

if [[ -n "${buildnumberdir}" ]]; then
  product=$(plistbuddy "Print :CFBundleDisplayName")
  product=${product// /_}
  version=$(plistbuddy "Print :CFBundleShortVersionString")
  productdir="${buildnumberdir}/${product}"
  if [[ ! -d "${productdir}" ]]; then
    mkdir -p "${productdir}"
  fi
  buildnumberfile="${productdir}/${version}"
fi

bundled_build_number=$(plistbuddy "Print :CFBundleVersion")
if test -s "${buildnumberfile}"; then
  saved_build_number=$(head -1 "${buildnumberfile}")
fi
if test ${bundled_build_number} -gt ${saved_build_number:-0}; then
  # add 1 if $bundled_build_number is not 1, 0 if it is
  test ${bundled_build_number} -eq 1
  build_number=$((bundled_build_number + $?))
else
  build_number=$((saved_build_number + 1))
fi

plistbuddy "Set :CFBundleVersion ${build_number}"

if [[ -n "${buildnumberfile}" ]]; then
  echo ${build_number} > "${buildnumberfile}"
fi

if [[ "${verbose}" -gt 0 ]]; then
  echo "Incremented build number: ${product} ${version} (${build_number})"
fi