Automated versioning based on tags

generate-next-version-humber.sh

#!/bin/bash
# The greatest value Google Play allows for versionCode is 2100000000 and is not checked here for simplicity :)

RES=$(git show-ref --tags)
if [ -z "$RES" ]; then
    NEW_TAG="1.0.0-1"
else
    LATEST_TAG=$(git describe --tags --abbrev=0 --match *.*.*-*)

    echo "Latest detected tag is $LATEST_TAG"

    IFS='.' read -r -a array <<<${LATEST_TAG}
    major=${array[0]}
    minor=${array[1]}
    remainder=${array[2]}
    IFS='-' read -r -a array <<<${remainder}
    point=${array[0]}
    code=${array[1]}

    echo "Parsed major $major"
    echo "Parsed minor $minor"
    echo "Parsed point $point"
    echo "Parsed code $code"

    if [ "$point" == "999" ]; then
        if [ "$minor" == "999" ]; then
            point=0
            minor=0
            ((major++))
        else
            ((minor++))
            point=0
        fi
    elif [ "$minor" == "999" ] && [ "$point" == "999" ]; then
        ((major++))
        minor=0
    else
        ((point++))
    fi

    ((code++))

    NEW_TAG="${major}.${minor}.${point}-${code}"
fi

echo "New tag should be $NEW_TAG"