Batch update labels in Github repos

Gemfile

gem "octokit", "~> 4.0"

rename_labels.rb

require 'octokit'
require 'json'

Octokit.auto_paginate = true

client = Octokit::Client.new(:access_token => "MY_TOKEN")

repos = [
	'silverstripe/silverstripe-versioned',
]

default_labels = {
	"affects/v3" => "d4c5f9",
	"affects/v4" => "5319e7",
}

rename_labels = {
	"bug" => "type/bug",
}

remove_labels = [
	'wontfix',
	'question',
]

repos.each do | repo |
	puts '# Repo %s' % repo

	repo_labels = client.labels(repo)
	rename_labels.each do |from_name, to_name|
		existing_label = repo_labels.select{|k,v| k.name == from_name}.first
		if existing_label
			puts 'Renaming label from %s to %s' % [from_name, to_name]
			client.update_label(repo, from_name, {:name => to_name})
		end
	end

	# Fetch labels again because they might've been renamed
	repo_labels = client.labels(repo)
	default_labels.each do |name, color|
		existing_label = repo_labels.select{|k,v| k.name == name}.first
		if existing_label
			puts 'Updating label %s' % (name)
			client.update_label(repo, name, {:color => color})
		else
			puts 'Adding label %s' % (name)
			client.add_label(repo, name, color)
		end
	end

	remove_labels.each do |name|
		puts 'Removing label %s' % (name)
		client.delete_label!(repo, name)
	end
	
end