update-version

#!/bin/bash                 

# ------------
# Gets the current local tag
#
# @author  Björn Hempel <bjoern@hempel.li>
# @version 1.0 (2017-05-21)
# ------------
getCurrentTagFromGivenPath()
{
    local gitDir="$1"

    if [ "$gitDir" != "" ] && [ -d "$gitDir" ]; then
        cd "$gitDir"
    fi

    local tagName=$(git describe 2>/dev/null | xargs | sed 's~-[0-9]\+-[A-Za-z0-9]\+$~~')

    if [ "$tagName" == "" ]; then
        echo "v0.0.0"
    fi

    echo "$tagName"
}

# ------------
# Gets the next revision tag.
#
# @author  Björn Hempel <bjoern@hempel.li>
# @version 1.0 (2017-06-06)
# ------------
getNextTagFromGivenPath()
{
    local position=${2:-2}

    local currentTag=$(getCurrentTagFromGivenPath "$1")
    local  searchReg="^([v]?)([0-9]+)\.([0-9]+)\.([0-9]+)"

    if ! [[ "$currentTag" =~ $searchReg ]]; then
        >&2 echo "Unable to parse the current version \"$currentTag\"."
        return 1
    fi

    currentTag="${BASH_REMATCH[1]}${BASH_REMATCH[2]}.${BASH_REMATCH[3]}.${BASH_REMATCH[4]}"

    local major=${BASH_REMATCH[2]}
    local minor=${BASH_REMATCH[3]}
    local revision=${BASH_REMATCH[4]}
    local version="$major.$minor.$revision"
    local prefix=$(echo "$currentTag" | sed "s/$version$//")

    # increase the appropriate version number
    case $position in
        0)
            major=$((major + 1))
            minor=0
            revision=0
            ;;
        1)
            minor=$((minor + 1))
            revision=0
            ;;

        *)
            revision=$((revision + 1))
            ;;
    esac

    echo "$prefix$major.$minor.$revision"
}

# ------------
# Update and push given tag to given git repository.
#
# @author  Björn Hempel <bjoern@hempel.li>
# @version 1.0 (2017-06-10)
# ------------
getSetAndPushTag()
{
    local nextTag="$1"
    local gitDir="$2"

    if [ "$gitDir" != "" ] && [ -d "$gitDir" ]; then
        cd "$gitDir"
    fi

    git tag -a $nextTag -m "version $nextTag"
    git push origin $nextTag
}

# ------------
# updateVersion method
#
# @author  Björn Hempel <bjoern@hempel.li>
# @version 1.0 (2017-06-06)
# ------------
updateVersion()
{
    local pathRoot="$1"

    # check the given path
    if [ ! -d "$pathRoot/.git" ]; then
        echo "The path \"$pathRoot\" is not a repository path. Abort." && exit
    fi

    # extract the name of the given path
    name=$(basename `git rev-parse --show-toplevel`)

    local     currentTag=$(getCurrentTagFromGivenPath "$pathRoot")
    local    nextMajorTag=$(getNextTagFromGivenPath "$pathRoot" 0)
    local    nextMinorTag=$(getNextTagFromGivenPath "$pathRoot" 1)                                                                                                                                                
    local nextRevisionTag=$(getNextTagFromGivenPath "$pathRoot" 2)

    echo "name:            $name"
    echo "directory:       $pathRoot"
    echo "current version: $currentTag"
    echo
    echo "Which new version number you want to use? (1) - $nextMajorTag, (2) - $nextMinorTag or (3) $nextRevisionTag"
    echo

    while true; do
        read -n 1 -p "Choose (1), (2) or (3): " choice
        case $choice in
            # 1
            1)
                local nextTag="$nextMajorTag"
                break
                ;;
            # 2
            2)
                local nextTag="$nextMinorTag"
                break
                ;;
            # 3
            3)
                local nextTag="$nextRevisionTag"
                break
                ;;
            # escape
            $'\e')
                echo
                echo
                echo "The command was cancelled by user."
                exit
                ;;
            # other character
            *)
                echo
                ;;
        esac
    done

    echo
    echo

    while true; do
        read -n 1 -p "This will set the current version number $currentTag to $nextTag. Do you want to continue? Type (y)es or (no): " yn
        case $yn in
            # yes
            [Yy]*)
                break
                ;;
            # no
            [Nn]*)
                echo                                                                                                                                                                                              
                echo "The command was cancelled by user."
                exit
                ;;
            # escape
            $'\e')
                echo
                echo "The command was cancelled by user."
                exit
                ;;
            # other character
            *)
                echo
                ;;
        esac
    done

    # set and push new tag
    echo
    $(getSetAndPushTag "$nextTag" "$pathRoot")
    echo "Done!"
}

# some configs and informations
scriptname="$0"
pathRoot="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# update version
updateVersion "$pathRoot"