From 84632598a0d07782ce3f9f3a51914c174924d511 Mon Sep 17 00:00:00 2001
From: Issy Long <me@issyl0.co.uk>
Date: Thu, 3 Mar 2022 01:24:36 +0000
Subject: [PATCH] utils/github: Add a `branch_exists?` method

- I wrote this as part of
  https://github.com/issyl0/homebrew-maintenance-utils/blob/main/cmd/find-invalid-head-branches.rb,
  as I needed to check if a branch exists on a repo, and thought I'd properly add
  it in case it's useful to others.
---
 Library/Homebrew/utils/github.rb | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Library/Homebrew/utils/github.rb b/Library/Homebrew/utils/github.rb
index 41335cbe62..f7eef01068 100644
--- a/Library/Homebrew/utils/github.rb
+++ b/Library/Homebrew/utils/github.rb
@@ -80,6 +80,13 @@ module GitHub
     ["admin", "write"].include?(permission(repo, user)["permission"])
   end
 
+  def branch_exists?(user, repo, branch)
+    API.open_rest("#{API_URL}/repos/#{user}/#{repo}/branches/#{branch}")
+    true
+  rescue API::HTTPNotFoundError
+    false
+  end
+
   def pull_requests(repo, **options)
     url = "#{API_URL}/repos/#{repo}/pulls?#{URI.encode_www_form(options)}"
     API.open_rest(url)