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melbot
File size: 2,717 Bytes
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import { execFileSync } from "node:child_process";
import { readFileSync } from "node:fs";
import { resolve } from "node:path";

type RepoLabel = {
  name: string;
  color?: string;
};

const COLOR_BY_PREFIX = new Map<string, string>([
  ["channel", "1d76db"],
  ["app", "6f42c1"],
  ["extensions", "0e8a16"],
  ["docs", "0075ca"],
  ["cli", "f9d0c4"],
  ["gateway", "d4c5f9"],
]);

const configPath = resolve(".github/labeler.yml");
const labelNames = extractLabelNames(readFileSync(configPath, "utf8"));

if (!labelNames.length) {
  throw new Error("labeler.yml must declare at least one label.");
}

const repo = resolveRepo();
const existing = fetchExistingLabels(repo);

const missing = labelNames.filter((label) => !existing.has(label));
if (!missing.length) {
  console.log("All labeler labels already exist.");
  process.exit(0);
}

for (const label of missing) {
  const color = pickColor(label);
  execFileSync(
    "gh",
    [
      "api",
      "-X",
      "POST",
      `repos/${repo}/labels`,
      "-f",
      `name=${label}`,
      "-f",
      `color=${color}`,
    ],
    { stdio: "inherit" },
  );
  console.log(`Created label: ${label}`);
}

function extractLabelNames(contents: string): string[] {
  const labels: string[] = [];
  for (const line of contents.split("\n")) {
    if (!line.trim() || line.trimStart().startsWith("#")) {
      continue;
    }
    if (/^\s/.test(line)) {
      continue;
    }
    const match = line.match(/^(["'])(.+)\1\s*:/) ?? line.match(/^([^:]+):/);
    if (match) {
      const name = (match[2] ?? match[1] ?? "").trim();
      if (name) {
        labels.push(name);
      }
    }
  }
  return labels;
}

function pickColor(label: string): string {
  const prefix = label.includes(":") ? label.split(":", 1)[0].trim() : label.trim();
  return COLOR_BY_PREFIX.get(prefix) ?? "ededed";
}

function resolveRepo(): string {
  const remote = execFileSync("git", ["config", "--get", "remote.origin.url"], {
    encoding: "utf8",
  }).trim();

  if (!remote) {
    throw new Error("Unable to determine repository from git remote.");
  }

  if (remote.startsWith("git@github.com:")) {
    return remote.replace("git@github.com:", "").replace(/\.git$/, "");
  }

  if (remote.startsWith("https://github.com/")) {
    return remote.replace("https://github.com/", "").replace(/\.git$/, "");
  }

  throw new Error(`Unsupported GitHub remote: ${remote}`);
}

function fetchExistingLabels(repo: string): Map<string, RepoLabel> {
  const raw = execFileSync(
    "gh",
    ["api", `repos/${repo}/labels?per_page=100`, "--paginate"],
    { encoding: "utf8" },
  );
  const labels = JSON.parse(raw) as RepoLabel[];
  return new Map(labels.map((label) => [label.name, label]));
}