dotfiles/bin/gource-gravatars

#!/usr/bin/env node

const fs = require("fs");
const path = require("path");
const { spawn } = require("child_process");
const https = require("https");
const crypto = require("crypto");

const size = 256;
const outputDir = ".git/avatar";

if (!fs.existsSync(".git")) {
  console.error("No .git/ directory found in current path");
  process.exit(1);
}

if (!fs.existsSync(outputDir)) {
  fs.mkdirSync(outputDir, { recursive: true });
}

const processedAuthors = new Set();

const gitLogCommand = "git";
const gitLogArgs = ["log", "--pretty=format:%ae|%an"];

const gitLog = spawn(gitLogCommand, gitLogArgs);

gitLog.stdout.on("data", (data) => {
  const lines = data.toString().trim().split("\n");

  lines.forEach((line) => {
    const [email, author] = line.split("|");

    if (processedAuthors.has(author)) {
      return;
    }
    processedAuthors.add(author);

    const authorImageFile = path.join(outputDir, `${author}.png`);
    console.log(`Author image file: ${authorImageFile}`);

    if (fs.existsSync(authorImageFile)) {
      return;
    }

    const emailHash = crypto
      .createHash("md5")
      .update(email.toLowerCase())
      .digest("hex");
    const gravUrl = `https://www.gravatar.com/avatar/${emailHash}?s=${size}`;
    console.log(`Gravatar URL: ${gravUrl}`);

    https
      .get(gravUrl, (response) => {
        if (response.statusCode === 200) {
          const writer = fs.createWriteStream(authorImageFile);
          response.pipe(writer);
          console.log("Image saved successfully");
        } else {
          console.error(
            `Failed to save image: ${response.statusCode} ${response.statusMessage}`,
          );
          fs.unlinkSync(authorImageFile);
        }
      })
      .on("error", (error) => {
        console.error(`Failed to save image: ${error.message}`);
        fs.unlinkSync(authorImageFile);
      });
  });
});

gitLog.stderr.on("data", (data) => {
  console.error(`Error executing git log: ${data}`);
});

gitLog.on("close", (code) => {
  if (code !== 0) {
    console.error(`git log process exited with code ${code}`);
  }
});