piscine-tag.sh

#!/bin/sh

if [ $# -ne 1 ]; then
    exit 1
fi

git status > /dev/null
if [ $? -ne 0 ]; then
    exit 1
fi

prefix="submission/"
suffix="-v"

last_version=""
for tag in $(git tag | grep "$prefix$1$suffix"); do
    last_version="$tag"
done

echo "Subject: $1"
if [ -z "$last_version" ]; then
    echo "No tags found"
    echo "Version: 1.0"

    user_choice=
    while [ "$user_choice" != "y" ] && [ "$user_choice" != "n" ]; do
        read -p 'Create it? [y/n]: ' user_choice
    done
    if [ "$user_choice" == "n" ]; then
        exit 1
    fi
    echo "Create tag $prefix$1${suffix}1.0"
    git tag -a "$prefix$1${suffix}1.0" -m"$1"
else
    ver=$(echo "$last_version" | cut -d'-' -f2 | cut -d'v' -f2)
    echo "last version: $ver"
    maj_ver=$(echo "$ver" | cut -d'.' -f1)
    min_ver=$(echo "$ver" | cut -d'.' -f2)
    min_ver=$(($min_ver+1))
    if [ $min_ver -eq 10 ]; then
        min_ver=0
        maj_ver=$(($maj_ver+1))
    fi
    new_ver="$maj_ver.$min_ver"
    echo "Version: $new_ver"
    user_choice=
    while [ "$user_choice" != "y" ] && [ "$user_choice" != "n" ]; do
        read -p 'Create it? [y/n]: ' user_choice
    done
    if [ "$user_choice" == "n" ]; then
        exit 1
    fi
    echo "Create tag $prefix$1${suffix}$new_ver"
    git tag -a "$prefix$1$suffix$new_ver" -m"$1"
fi

git status

exit 0

Usage: <tag_name>

It will create a new tag with the following format : submission/<tag_name>-v<major_version>.<minor_version>

If your git contains tags with submission/<tag_name>, this program will search the maximum version and increment it.
Otherwise, the version will be 1.0.