GitCommitExtractor - Extracts every commit of a Git repository into folders of the repository at that commit's stage

gitcex.ts

// Usage:
// node --no-warnings --loader ts-node/esm gitcex.ts <REPOSITORY_GIT_URL>
// pass 'local' on <REPOSITORY_GIT_URL> to use an already fetched repository on ./repository folder.
//
//! WARNING: Very disk-intensive and disk space consuming for large repositories.

import fs from 'fs';
import { execSync as exec } from 'child_process';
const argv = process.argv.slice(2);

if (fs.existsSync('commits')) fs.rmSync('commits', { recursive: true });
fs.mkdirSync('commits');

const USE_LOCAL_REPO = argv[0] === 'local';
if (!USE_LOCAL_REPO) {
    const REPOSITORY_URL = argv[0];
    if (fs.existsSync('repository')) fs.rmSync('repository', { recursive: true });
    exec(`git clone ${REPOSITORY_URL} repository`);
}

const gitlog = exec('git --no-pager log --no-merges --oneline', {
    cwd: './repository'
}).toString('utf8').split('\n').slice(0, -1).map(commit => {
    const [hash, ...msg] = commit.split(' ');
    return [hash, msg.join(' ')];
});

for (const [hash, msg] of gitlog) {
    console.log(`Extracting commit ${hash}: ${msg}`);
    fs.cpSync(`./repository`, `./commits/${hash}`, { recursive: true });
    exec(`git checkout ${hash}`, { cwd: `./commits/${hash}` });
    const fullhash = exec(`git rev-parse ${hash}`, { cwd: `./repository` }).toString('utf8').trim();
    fs.writeFileSync(`./commits/${hash}/commit.txt`, `${fullhash}\n${msg}\n`);
}

console.log(`${gitlog.length} commits extracted.`);