enhance-changelog.js

const { execSync, spawnSync } = require('child_process');
const fs = require('fs');

const tag = execSync('git describe --tags --abbrev=0').toString().trim();
console.log('Checking commits since', tag);

const args = ['-n', '1', `${tag}..HEAD`, '--abbrev=7', '--pretty=%h', '--', 'CHANGELOG.md'];
function findCommit(line) {
    const result = spawnSync('git', ['log', '-S', line, ...args], { shell: false });
    if (result.status === 0) return result.stdout.toString().trim();
    throw new Error(result.stderr.toString());
}

const lines = fs.readFileSync('CHANGELOG.md').toString().split(/\r?\n/g);

let enhanced = 0;
let shouldEnhance = false;
for (let i = 0; i < lines.length; i++) {
    const line = lines[i];
    if (line.startsWith('## Unreleased')) shouldEnhance = true;
    else if (line.startsWith('## ')) break;
    if (!line.startsWith('- ')) continue;
    const commit = findCommit(line);
    if (!commit) return;
    console.log(line, '=>', commit);
    const brackets = line.match(/ \((.*?)\)$/);
    if (brackets) {
        if (brackets[1].match(/[\da-fA-F]{7}/)) continue;
        if (!brackets[1].includes(' ')) {
            lines[i] = line.replace(/\(.*?\)$/, `(${commit}, ${brackets[1]})`);
            enhanced++;
            continue;
        }
    }
    lines[i] = `${line} (${commit})`;
    enhanced++;
}

console.log(`Enhanced ${enhanced} lines`);
fs.writeFileSync('CHANGELOG.md', lines.join('\n'));