Bump a submodule to the provided tag using commits in versionist syntax

bump-submodule.sh

#!/usr/bin/env bash

module_path="${1}"
tag="${2}"

tag() {
    if [[ $1 == v* ]]
    then
        echo "${1/v/}"
    else
        echo "${1}"
    fi
}

tagv() {
    if [[ $1 != v* ]] && [[ $1 =~ ^[0-9] ]]
    then
        echo "v${1}"
    else
        echo "${1}"
    fi
}

create_branch() {

    local module_path="${1}"
    local tag="${2}"

    local module_name
    local prev_tag
    
    module_name="$(basename "${module_path}")"
    prev_tag="$(git submodule status "${module_path}" | grep -Po '\(\K[^)]*')"

    git checkout -b "${module_name}-${tag//[^[:alnum:]_]/-}"
}

checkout_submodule() {

    local module_path="${1}"
    local tag="${2}"

    local module_name
    local prev_tag

    git submodule update --init --recursive "${module_path}"
    
    module_name="$(basename "${module_path}")"
    prev_tag="$(git submodule status "${module_path}" | grep -Po '\(\K[^)]*')"

    [ -n "${prev_tag}" ] || { echo "Failed to determine previous tag"; exit 1 ; }

    (cd "${module_path}" || exit 1
        git fetch
        git checkout "$(tagv "${tag}")"
    )

    git add "${module_path}"
    git commit -m "${module_path}: Update ${module_name} to $(tagv "${tag}")

Update ${module_name} from $(tag "${prev_tag}") to $(tag "${tag}")

Changelog-entry: Update ${module_name} from $(tagv "${prev_tag}") to $(tagv "${tag}")
Change-type: patch
"
}

create_branch "${module_path}" "${tag}"

checkout_submodule "${module_path}" "${tag}"