const {spawnSync} = require('child_process');

const resolveVersion = () => {
    const exec = (cmd, ...args) => {
        const pr = spawnSync(cmd, args, {
            timeout: 6000
        });

        return pr.error ? null : pr.stdout.toString('utf-8').trim();
    };

    const totalCommits = exec('git', 'rev-list', '--count', 'HEAD');
    const lastTag = exec('git', 'describe', '--tags', '--abbrev=0');

    if (lastTag) {
        const commitsFromTag = exec('git', 'rev-list', '--count', lastTag);
        return `${lastTag}.${totalCommits - commitsFromTag}`;
    } else {

        // No tags so far
        return `0.0.0.${totalCommits}`;
    }
};

console.log(resolveVersion());