git-semver.sh

#! /bin/bash

# Assumes that you tag versions with the version number (e.g., "1.1")
# and then the build number is that plus the number of commits since
# the tag (e.g., "1.1.17")

DESCRIBE=`git describe --tags --always`

# increment the build number (ie 115 to 116)
VERSION=`echo $DESCRIBE | awk '{split($0,a,"-"); print a[1]}'`
BUILD=`echo $DESCRIBE | awk '{split($0,a,"-"); print a[2]}'`
PATCH=`echo $DESCRIBE | awk '{split($0,a,"-"); print a[3]}'`

if [[ "${DESCRIBE}" =~ ^[A-Fa-f0-9]+$ ]]; then
    VERSION="0.0.0"
    BUILD=`git rev-list HEAD --count`
    PATCH=${DESCRIBE}
fi

if [ "${BUILD}" = "" ]; then
    BUILD='0'
fi

if [ "${BUILD}" = "" ]; then
    PATCH=$DESCRIBE
fi


echo ${VERSION}+build.${BUILD}.${PATCH}