Add MIT licenses to all your repos

script.js

const TOKEN = "...." // your github access token
const owner = "..." // your github name

const blackList = [] // the names of the repos you don't want to process

const { Octokit } = require("@octokit/rest") // install this first
const octokit = new Octokit({ auth: TOKEN })

const fs = require("fs")

const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms))

function licenseContent(year) {
	return `Copyright (c) ${year} ${owner}
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.`
}

// writes all your repos to a JSON file
async function writeRepos() {
	const options = octokit.repos.listForAuthenticatedUser.endpoint.merge({
		per_page: 100,
	})
	const repos = await octokit.paginate(options)
	const my_repos = repos.filter(
		(repo) =>
			repo.owner.login === owner &&
			!blackList.includes(repo.name)
	)
	const reduced_repos = my_repos.map((repo) => {
		return {
			name: repo.name,
			year: repo.updated_at.split("-")[0],
		}
	})
	fs.writeFileSync("repos.json", JSON.stringify(reduced_repos))
}

// adds a license file to a repo (unless it is already there)
async function add_license(repo) {
	const year = new Date().getFullYear()
	try {
		await octokit.repos.getContent({
			owner: owner,
			repo: repo.name,
			path: "LICENSE",
		})
	} catch (error) {
		if (error.status === 404) {
			try {
				await octokit.repos.createOrUpdateFileContents({
					owner: owner,
					repo: repo.name,
					path: "LICENSE",
					message: "Add MIT License",
					content: Buffer.from(licenseContent(year)).toString(
						"base64"
					),
				})
				console.log(`Added license to ${repo.name}`)
			} catch (error) {
				console.log(`Could not add license to ${repo.name}`)
				console.error(error)
			}
		} else {
			console.error(error)
		}
	}
}

// adds licenses to all repos in the JSON file
async function add_licenses() {
	const repos = JSON.parse(fs.readFileSync("repos.json"))
	for (const repo of repos) {
		await add_license(repo)
		await sleep(1000)
	}
}

// execute this first to write all repos:
// writeRepos().catch(console.error) 

// delete the repos from the file you want to exclude,
// or update the blackList array and run the command again

// then run the following to add the licenses
// add_licenses().catch(console.error)