Download Gravatars for all authors of a git repo and save in folder. Useful when combined with Gource. Node.js CLI script.

gource-gravatar.js

#!/usr/bin/env node
'use strict';

// Inspired by https://github.com/acaudwell/Gource/wiki/Gravatar-Example

const { execSync } = require('child_process');
const crypto = require('crypto');
const https = require('https');
const fs = require('fs');

const size = 90;
const outputDir = '.avatars';

const authors = execSync('git log --pretty=format:"%ae|%an"', { encoding: 'utf8' });

const reducedAuthors = authors.split('\n').reduce((result, item) => {
  item = item.trim();
  if (item === '') { return result; }
  const [ email, author ] = item.split('|')
  const preparedEmail = email.trim().toLowerCase();
  result[preparedEmail] = author;
  return result;
}, {});

Object.keys(reducedAuthors).forEach(email => {
  const shasum = crypto.createHash('md5');
  shasum.update(email);
  const hash = shasum.digest('hex');

  const url = `https://www.gravatar.com/avatar/${hash}?d=identicon&s=${size}`;

  https.get(url, res => {
    res.pipe(fs.createWriteStream(outputDir + '/' + reducedAuthors[email] + '.jpg'));
  }).on('error', (e) => {
    console.log(`Got error: ${e.message}`);
  });
});