# First, check for git in $PATH

hash git 2>/dev/null || { echo >&2 "Git required, not installed. Aborting build number update script."; exit 0; }

# Build version (closest-tag-or-branch "-" commits-since-tag "-" short-hash dirty-flag)

function get_build_version() {

echo $(git describe --tags --always --dirty=+)

}

# Use the latest tag for short version (expected tag format "vn[.n[.n]]")

# or if there are no tags, we make up version 0.0.<commit count>

function get_short_version() {

LATEST_TAG=$(git describe --tags --match 'v*' --abbrev=0 2>/dev/null) || LATEST_TAG="HEAD"

if [ $LATEST_TAG = "HEAD" ]; then

COMMIT_COUNT=$(git rev-list --count HEAD)

LATEST_TAG="0.0.$COMMIT_COUNT"

COMMIT_COUNT_SINCE_TAG=0

else

COMMIT_COUNT_SINCE_TAG=$(git rev-list --count ${LATEST_TAG}..)

LATEST_TAG=${LATEST_TAG##v} # Remove the "v" from the front of the tag

fi

if [ $COMMIT_COUNT_SINCE_TAG = 0 ]; then

SHORT_VERSION="$LATEST_TAG"

else

# increment final digit of tag and append "d" + commit-count-since-tag

# e.g. commit after 1.0 is 1.1d1, commit after 1.0.0 is 1.0.1d1

# this is the bit that requires /bin/bash

OLD_IFS=$IFS

IFS="."

VERSION_PARTS=($LATEST_TAG)

LAST_PART=$((${#VERSION_PARTS[@]}-1))

VERSION_PARTS[$LAST_PART]=$((${VERSION_PARTS[${LAST_PART}]}+1))

SHORT_VERSION="${VERSION_PARTS[*]}d${COMMIT_COUNT_SINCE_TAG}"

IFS=$OLD_IFS

fi

echo $SHORT_VERSION

}

# Bundle version (commits-on-master[-until-branch "." commits-on-branch])

# Assumes that two release branches will not diverge from the same commit on master.

function get_bundle_version() {

if [ $(git rev-parse --abbrev-ref HEAD) = "master" ]; then

MASTER_COMMIT_COUNT=$(git rev-list --count HEAD)

BRANCH_COMMIT_COUNT=0

BUNDLE_VERSION="$MASTER_COMMIT_COUNT"

else

if [ $(git rev-list --count master..) = 0 ]; then # The branch is attached to master. Just count master.

MASTER_COMMIT_COUNT=$(git rev-list --count HEAD)

else

MASTER_COMMIT_COUNT=$(git rev-list --count $(git rev-list master.. | tail -n 1)^)

fi

BRANCH_COMMIT_COUNT=$(git rev-list --count master..)

if [ $BRANCH_COMMIT_COUNT = 0 ]; then

BUNDLE_VERSION="$MASTER_COMMIT_COUNT"

else

BUNDLE_VERSION="${MASTER_COMMIT_COUNT}.${BRANCH_COMMIT_COUNT}"

fi

fi

echo $BUNDLE_VERSION

}