git-issue-patch

#!/usr/bin/env ruby

def usage_and_exit
  usage = <<-USAGE
Usage: git issue-patch [ISSUE_OR_PR_NUMBER]

Retrieves raw diff patch for an issue/pr on Github and executes `git apply [patch]`

(Requires either gh or hub in $PATH)
(Choose by setting export GITHUB_API_TOOL='hub' in environment)
  USAGE
  warn usage
  exit(1)
end

def binary_full_path
  default_bin = 'gh' # Can be replaced with 'hub'

  gh_bin = ENV.fetch('GITHUB_API_TOOL') { default_bin }

  usage_and_exit unless system("which #{gh_bin} > /dev/null")

  `which #{gh_bin}`.chomp
end

def remotes
  `git remote -v`.chomp.split("\n").map { |l| l.split[1] }.grep(/github/i)
end

def extract_issue(args = ARGV.dup)
  begin
    args.first[/\d+/]
  rescue NoMethodError
    usage_and_exit
  end
end

def full_repo_name(remote)
  if remote
    repo_regex = %r{github\.com[:/](?<full_repo_name>.*)\.git}
    remote.match(repo_regex)[:full_repo_name]
  else
    usage_and_exit
  end
end

def execute_patch_apply(gh, url)
  exec "#{gh} apply #{url} > /dev/null"
end

def fetch_patch(url)
  # If using as standalone, ie just fetching patch not applying
  patch_url = "#{url}.patch"
  patch = `curl --silent -L #{patch_url}`.chomp
end

def main(io = STDOUT)
  github = binary_full_path
  issue_no = extract_issue
  remote = remotes.first

  full_name = full_repo_name(remote)

  url = "https://github.com/#{full_name}/pull/#{issue_no}"
  io.puts url
  execute_patch_apply(github, url)
end

main